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StreamReader.xml
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StreamReader.xml
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<Type Name="StreamReader" FullName="System.IO.StreamReader">
<TypeSignature Language="C#" Value="public class StreamReader : System.IO.TextReader" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit StreamReader extends System.IO.TextReader" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="DocId" Value="T:System.IO.StreamReader" />
<TypeSignature Language="VB.NET" Value="Public Class StreamReader
Inherits TextReader" />
<TypeSignature Language="F#" Value="type StreamReader = class
 inherit TextReader" />
<TypeSignature Language="C++ CLI" Value="public ref class StreamReader : System::IO::TextReader" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable beforefieldinit StreamReader extends System.IO.TextReader" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<AssemblyInfo>
<AssemblyName>System.IO</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime.Extensions</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="mscorlib" FromVersion="4.0.0.0" To="System.IO" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="System.IO" FromVersion="5.0.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="5.0.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="System.IO" FromVersion="6.0.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="6.0.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="System.IO" FromVersion="7.0.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="7.0.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="System.IO" FromVersion="8.0.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="8.0.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.IO" FromVersion="9.0.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Runtime.Extensions" FromVersion="9.0.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.IO" FromVersion="4.2.0.0" To="System.Runtime.Extensions" ToVersion="4.2.0.0" FrameworkAlternate="netcore-2.0" />
<TypeForwarding From="System.IO" FromVersion="4.2.1.0" To="System.Runtime.Extensions" ToVersion="4.2.1.0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0" />
<TypeForwarding From="System.IO" FromVersion="4.2.2.0" To="System.Runtime.Extensions" ToVersion="4.2.2.0" FrameworkAlternate="netcore-3.1" />
<TypeForwarding From="System.IO" FromVersion="4.1.1.0" To="mscorlib" ToVersion="4.0.0.0" FrameworkAlternate="netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.IO.TextReader</BaseTypeName>
</Base>
<Interfaces />
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Serializable]</AttributeName>
<AttributeName Language="F#">[<System.Serializable>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Runtime.InteropServices.ComVisible(true)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(true)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Implements a <see cref="T:System.IO.TextReader" /> that reads characters from a byte stream in a particular encoding.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.IO.StreamReader> is designed for character input in a particular encoding, whereas the <xref:System.IO.Stream> class is designed for byte input and output. Use <xref:System.IO.StreamReader> for reading lines of information from a standard text file.
> [!IMPORTANT]
> This type implements the <xref:System.IDisposable> interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its <xref:System.IDisposable.Dispose%2A> method in a `try`/`catch` block. To dispose of it indirectly, use a language construct such as `using` (in C#) or `Using` (in Visual Basic). For more information, see the "Using an Object that Implements IDisposable" section in the <xref:System.IDisposable> interface topic.
<xref:System.IO.StreamReader> defaults to UTF-8 encoding unless specified otherwise, instead of defaulting to the ANSI code page for the current system. UTF-8 handles Unicode characters correctly and provides consistent results on localized versions of the operating system. If you get the current character encoding using the <xref:System.IO.StreamReader.CurrentEncoding%2A> property, the value is not reliable until after the first <xref:System.IO.StreamReader.Read%2A> method, since encoding auto detection is not done until the first call to a <xref:System.IO.StreamReader.Read%2A> method.
By default, a <xref:System.IO.StreamReader> is not thread safe. See <xref:System.IO.TextReader.Synchronized%2A?displayProperty=nameWithType> for a thread-safe wrapper.
The <xref:System.IO.StreamReader.Read%28System.Char%5B%5D%2CSystem.Int32%2CSystem.Int32%29> and <xref:System.IO.StreamWriter.Write%28System.Char%5B%5D%2CSystem.Int32%2CSystem.Int32%29> method overloads read and write the number of characters specified by the `count` parameter. These are to be distinguished from <xref:System.IO.BufferedStream.Read%2A?displayProperty=nameWithType> and <xref:System.IO.BufferedStream.Write%2A?displayProperty=nameWithType>, which read and write the number of bytes specified by the `count` parameter. Use the <xref:System.IO.BufferedStream> methods only for reading and writing an integral number of byte array elements.
> [!NOTE]
> When reading from a <xref:System.IO.Stream>, it is more efficient to use a buffer that is the same size as the internal buffer of the stream.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following example uses an instance of <xref:System.IO.StreamReader> to read text from a file. The constructor used in this example is not supported for use in Windows Store Apps.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/ReadTextFile/CPP/readtextfile.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/readtextfile.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/ReadTextFile/VB/readtextfile.vb" id="Snippet1":::
The following example instantiates a <xref:System.IO.StreamReader> object and calls its <xref:System.IO.StreamReader.ReadAsync%2A> method to read a file asynchronously.
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/asyncex1.cs" id="Snippet51":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/asyncex1.vb" id="Snippet51":::
]]></format>
</remarks>
<altmember cref="T:System.Text.Encoding" />
<altmember cref="T:System.IO.Stream" />
<altmember cref="T:System.IO.StreamWriter" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-and-write-to-a-newly-created-data-file">How to: Read and Write to a Newly Created Data File</related>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>System.IO</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified stream.</summary>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public StreamReader (System.IO.Stream stream);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.IO.Stream stream) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.StreamReader.#ctor(System.IO.Stream)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (stream As Stream)" />
<MemberSignature Language="F#" Value="new System.IO.StreamReader : System.IO.Stream -> System.IO.StreamReader" Usage="new System.IO.StreamReader stream" />
<MemberSignature Language="C++ CLI" Value="public:
 StreamReader(System::IO::Stream ^ stream);" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.IO</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime.Extensions</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters>
<Parameter Name="stream" Type="System.IO.Stream" />
</Parameters>
<Docs>
<param name="stream">The stream to be read.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified stream.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor initializes the encoding to <xref:System.Text.UTF8Encoding>, the <xref:System.IO.StreamReader.BaseStream%2A> property using the `stream` parameter, and the internal buffer size to 1024 bytes.
The <xref:System.IO.StreamReader> object calls <xref:System.IO.Stream.Dispose> on the provided <xref:System.IO.Stream> object when <xref:System.IO.StreamReader.Dispose%2A?displayProperty=nameWithType> is called.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/StrmReader Ctor1/CPP/strmreader ctor1.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/.ctor/strmreader ctor1.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/StrmReader Ctor1/VB/strmreader ctor1.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="stream" /> does not support reading.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="stream" /> is <see langword="null" />.</exception>
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
</Docs>
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<param name="path">The complete file path to be read.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified file name.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The complete file path is specified by the `path` parameter. This constructor initializes the encoding to <xref:System.Text.UTF8Encoding> and the buffer size to 1024 bytes.
The `path` parameter can be a file name, including a file on a Universal Naming Convention (UNC) share.
The `path` parameter is not required to be a file stored on disk; it can be any part of a system that supports access using streams.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/StrmReader Ctor2/CPP/strmreader ctor2.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/.ctor/strmreader ctor2.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/StrmReader Ctor2/VB/strmreader ctor2.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="path" /> is an empty string ("").</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="path" /> is <see langword="null" />.</exception>
<exception cref="T:System.IO.FileNotFoundException">The file cannot be found.</exception>
<exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
<exception cref="T:System.IO.IOException">
<paramref name="path" /> includes an incorrect or invalid syntax for file name, directory name, or volume label.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<param name="stream">The stream to be read.</param>
<param name="detectEncodingFromByteOrderMarks">Indicates whether to look for byte order marks at the beginning of the file.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified stream, with the specified byte order mark detection option.</summary>
<remarks>
<format type="text/markdown"><.
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="stream" /> does not support reading.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="stream" /> is <see langword="null" />.</exception>
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<Docs>
<param name="stream">The stream to be read.</param>
<param name="encoding">The character encoding to use.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified stream, with the specified character encoding.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The character encoding is set by the `encoding` parameter, and the buffer size is set to 1024 bytes. The <xref:System.IO.StreamReader> object attempts to detect the encoding by looking at the first four bytes of the stream. It automatically recognizes UTF-8, little-endian UTF-16, big-endian UTF-16, little-endian UTF-32, and big-endian UTF-32 text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the <xref:System.Text.Encoding.GetPreamble%2A?displayProperty=nameWithType> method for more information.
The <xref:System.IO.StreamReader> object calls <xref:System.IO.Stream.Dispose> on the provided <xref:System.IO.Stream> object when <xref:System.IO.StreamReader.Dispose%2A?displayProperty=nameWithType> is called.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="stream" /> does not support reading.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="stream" /> or <paramref name="encoding" /> is <see langword="null" />.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<param name="path">The complete file path to be read.</param>
<param name="detectEncodingFromByteOrderMarks">Indicates whether to look for byte order marks at the beginning of the file.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified file name, with the specified byte order mark detection option.</summary>
<remarks>
<format type="text/markdown"><.
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="path" /> is an empty string ("").</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="path" /> is <see langword="null" />.</exception>
<exception cref="T:System.IO.FileNotFoundException">The file cannot be found.</exception>
<exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
<exception cref="T:System.IO.IOException">
<paramref name="path" /> includes an incorrect or invalid syntax for file name, directory name, or volume label.</exception>
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<remarks>To be added.</remarks>
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<paramref name="stream" /> is not readable.
-or-
<paramref name="path" /> is an empty string ("").</exception>
<exception cref="T:System.ArgumentNullException">
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<exception cref="T:System.IO.FileNotFoundException">The file cannot be found.</exception>
<exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
<exception cref="T:System.IO.IOException">
<paramref name="path" /> includes an incorrect or invalid syntax for file name, directory name, or volume label.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<Docs>
<param name="path">The complete file path to be read.</param>
<param name="encoding">The character encoding to use.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified file name, with the specified character encoding.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor initializes the encoding as specified by the `encoding` parameter, and the internal buffer size to 1024 bytes. The <xref:System.IO.StreamReader> object attempts to detect the encoding by looking at the first four bytes of the stream. It automatically recognizes UTF-8, little-endian UTF-16, big-endian UTF-16, little-endian UTF-32, and big-endian UTF-32 text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the <xref:System.Text.Encoding.GetPreamble%2A?displayProperty=nameWithType> method for more information.
The `path` parameter can be a file name, including a file on a Universal Naming Convention (UNC) share.
The `path` parameter is not required to be a file stored on disk; it can be any part of a system that supports access using streams.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
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<paramref name="path" /> is an empty string ("").</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="path" /> or <paramref name="encoding" /> is <see langword="null" />.</exception>
<exception cref="T:System.IO.FileNotFoundException">The file cannot be found.</exception>
<exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
<exception cref="T:System.NotSupportedException">
<paramref name="path" /> includes an incorrect or invalid syntax for file name, directory name, or volume label.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<Parameter Name="encoding" Type="System.Text.Encoding" />
<Parameter Name="detectEncodingFromByteOrderMarks" Type="System.Boolean" />
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<Docs>
<param name="stream">The stream to be read.</param>
<param name="encoding">The character encoding to use.</param>
<param name="detectEncodingFromByteOrderMarks">Indicates whether to look for byte order marks at the beginning of the file.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified stream, with the specified character encoding and byte order mark detection option.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor initializes the encoding as specified by the `encoding` parameter, the <xref:System.IO.StreamReader.BaseStream%2A> property using the `stream` parameter, and the internal buffer size to 1024 bytes.
The `detectEncodingFromByteOrderMarks` parameter detects the encoding by looking at the first four bytes of the stream. It automatically recognizes UTF-8, little-endian UTF-16, big-endian UTF-16, little-endian UTF-32, and big-endian UTF-32 text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the <xref:System.Text.Encoding.GetPreamble%2A?displayProperty=nameWithType> method for more information.
The <xref:System.IO.StreamReader> object calls <xref:System.IO.Stream.Dispose> on the provided <xref:System.IO.Stream> object when <xref:System.IO.StreamReader.Dispose%2A?displayProperty=nameWithType> is called.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="stream" /> does not support reading.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="stream" /> or <paramref name="encoding" /> is <see langword="null" />.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<Docs>
<param name="path">The complete file path to be read.</param>
<param name="encoding">The character encoding to use.</param>
<param name="detectEncodingFromByteOrderMarks">Indicates whether to look for byte order marks at the beginning of the file.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified file name, with the specified character encoding and byte order mark detection option.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor initializes the encoding as specified by the `encoding` parameter, and the internal buffer size to 1024 bytes.
The `detectEncodingFromByteOrderMarks` parameter detects the encoding by looking at the first four bytes of the stream. It automatically recognizes UTF-8, little-endian UTF-16, big-endian UTF-16, little-endian UTF-32, and big-endian UTF-32 text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the <xref:System.Text.Encoding.GetPreamble%2A?displayProperty=nameWithType> method for more information.
The `path` parameter can be a file name, including a file on a Universal Naming Convention (UNC) share.
The `path` parameter is not required to be a file stored on disk; it can be any part of a system that supports access using streams.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">
<paramref name="path" /> is an empty string ("").</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="path" /> or <paramref name="encoding" /> is <see langword="null" />.</exception>
<exception cref="T:System.IO.FileNotFoundException">The file cannot be found.</exception>
<exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid, such as being on an unmapped drive.</exception>
<exception cref="T:System.NotSupportedException">
<paramref name="path" /> includes an incorrect or invalid syntax for file name, directory name, or volume label.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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<Parameter Name="encoding" Type="System.Text.Encoding" />
<Parameter Name="detectEncodingFromByteOrderMarks" Type="System.Boolean" />
<Parameter Name="bufferSize" Type="System.Int32" />
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<Docs>
<param name="stream">The stream to be read.</param>
<param name="encoding">The character encoding to use.</param>
<param name="detectEncodingFromByteOrderMarks">Indicates whether to look for byte order marks at the beginning of the file.</param>
<param name="bufferSize">The minimum buffer size.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.StreamReader" /> class for the specified stream, with the specified character encoding, byte order mark detection option, and buffer size.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The buffer size, in number of 16-bit characters, is set by the `bufferSize` parameter. If `bufferSize` is less than the minimum allowable size (128 characters), the minimum allowable size is used.
This constructor allows you to change the encoding the first time you read from the <xref:System.IO.StreamReader> object. The `detectEncodingFromByteOrderMarks` parameter detects the encoding by looking at the first four bytes of the stream. It automatically recognizes UTF-8, little-endian UTF-16, big-endian UTF-16, little-endian UTF-32, and big-endian UTF-32 text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the <xref:System.Text.Encoding.GetPreamble%2A?displayProperty=nameWithType> method for more information.
The <xref:System.IO.StreamReader> object calls <xref:System.IO.Stream.Dispose> on the provided <xref:System.IO.Stream> object when <xref:System.IO.StreamReader.Dispose%2A?displayProperty=nameWithType> is called.
> [!NOTE]
> When reading from a <xref:System.IO.Stream>, it is more efficient to use a buffer that is the same size as the internal buffer of the stream.
> [!CAUTION]
> When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.
For a list of common I/O tasks, see [Common I/O Tasks](/dotnet/standard/io/common-i-o-tasks).
## Examples
The following code example demonstrates this <xref:System.IO.StreamReader> constructor.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.IO.StreamReader/CPP/streamreadersample.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.IO/StreamReader/Overview/streamreadersample.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.StreamReader/VB/streamreadersample.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">The stream does not support reading.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="stream" /> or <paramref name="encoding" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="bufferSize" /> is less than or equal to zero.</exception>
<altmember cref="T:System.Text.Encoding" />
<related type="Article" href="/dotnet/standard/io/">File and Stream I/O</related>
<related type="Article" href="/dotnet/standard/io/how-to-read-text-from-a-file">How to: Read Text from a File</related>
<related type="Article" href="/dotnet/standard/io/how-to-write-text-to-a-file">How to: Write Text to a File</related>
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