Less alloc/wrapping/boxing for Query, Forms, Cookies

src/Microsoft.AspNet.Http.Abstractions/FragmentString.cs

@@ -100,7 +100,7 @@ public static FragmentString FromUriComponent(Uri uri)
             string fragmentValue = uri.GetComponents(UriComponents.Fragment, UriFormat.UriEscaped);
             if (!string.IsNullOrEmpty(fragmentValue))
             {
-                fragmentValue = "#" + fragmentValue;
+                fragmentValue = $"#{fragmentValue}";
             }
             return new FragmentString(fragmentValue);
         }

src/Microsoft.AspNet.Http.Abstractions/HostString.cs

@@ -70,18 +70,18 @@ public string ToUriComponent()
                 && _value.IndexOf(':', index + 1) >= 0)
             {
                 // IPv6 without brackets ::1 is the only type of host with 2 or more colons
-                return "[" + _value + "]";
+                return $"[{_value}]";
             }
             else if (index >= 0)
             {
                 // Has a port
                 string port = _value.Substring(index);
-                IdnMapping mapping = new IdnMapping();
+                var mapping = new IdnMapping();
                 return mapping.GetAscii(_value, 0, index) + port;
             }
             else
             {
-                IdnMapping mapping = new IdnMapping();
+                var mapping = new IdnMapping();
                 return mapping.GetAscii(_value);
             }
         }
@@ -115,12 +115,12 @@ public static HostString FromUriComponent(string uriComponent)
                     {
                         // Has a port
                         string port = uriComponent.Substring(index);
-                        IdnMapping mapping = new IdnMapping();
+                        var mapping = new IdnMapping();
                         uriComponent = mapping.GetUnicode(uriComponent, 0, index) + port;
                     }
                     else
                     {
-                        IdnMapping mapping = new IdnMapping();
+                        var mapping = new IdnMapping();
                         uriComponent = mapping.GetUnicode(uriComponent);
                     }
                 }

src/Microsoft.AspNet.Http.Abstractions/HttpRequest.cs

@@ -24,13 +24,13 @@ public abstract class HttpRequest
         public abstract string Method { get; set; }
 
         /// <summary>
-        /// Gets or set the HTTP request scheme from owin.RequestScheme.
+        /// Gets or set the HTTP request scheme.
         /// </summary>
-        /// <returns>The HTTP request scheme from owin.RequestScheme.</returns>
+        /// <returns>The HTTP request scheme.</returns>
         public abstract string Scheme { get; set; }
 
         /// <summary>
-        /// Returns true if the owin.RequestScheme is https.
+        /// Returns true if the RequestScheme is https.
         /// </summary>
         /// <returns>true if this request is using https; otherwise, false.</returns>
         public abstract bool IsHttps { get; set; }
@@ -42,33 +42,33 @@ public abstract class HttpRequest
         public abstract HostString Host { get; set; }
 
         /// <summary>
-        /// Gets or set the owin.RequestPathBase.
+        /// Gets or set the RequestPathBase.
         /// </summary>
-        /// <returns>The owin.RequestPathBase.</returns>
+        /// <returns>The RequestPathBase.</returns>
         public abstract PathString PathBase { get; set; }
 
         /// <summary>
-        /// Gets or set the request path from owin.RequestPath.
+        /// Gets or set the request path from RequestPath.
         /// </summary>
-        /// <returns>The request path from owin.RequestPath.</returns>
+        /// <returns>The request path from RequestPath.</returns>
         public abstract PathString Path { get; set; }
 
         /// <summary>
-        /// Gets or set the query string from owin.RequestQueryString.
+        /// Gets or set the query string.
         /// </summary>
-        /// <returns>The query string from owin.RequestQueryString.</returns>
+        /// <returns>The query string.</returns>
         public abstract QueryString QueryString { get; set; }
 
         /// <summary>
-        /// Gets the query value collection parsed from owin.RequestQueryString.
+        /// Gets the query value collection parsed from RequestQueryString.
         /// </summary>
-        /// <returns>The query value collection parsed from owin.RequestQueryString.</returns>
-        public abstract IReadableStringCollection Query { get; set; }
+        /// <returns>The query value collection parsed from RequestQueryString.</returns>
+        public abstract IQueryCollection Query { get; set; }
 
         /// <summary>
-        /// Gets or set the owin.RequestProtocol.
+        /// Gets or set the RequestProtocol.
         /// </summary>
-        /// <returns>The owin.RequestProtocol.</returns>
+        /// <returns>The RequestProtocol.</returns>
         public abstract string Protocol { get; set; }
 
         /// <summary>
@@ -81,7 +81,7 @@ public abstract class HttpRequest
         /// Gets the collection of Cookies for this request.
         /// </summary>
         /// <returns>The collection of Cookies for this request.</returns>
-        public abstract IReadableStringCollection Cookies { get; set; }
+        public abstract IRequestCookieCollection Cookies { get; set; }
 
         /// <summary>
         /// Gets or sets the Content-Length header
@@ -95,9 +95,9 @@ public abstract class HttpRequest
         public abstract string ContentType { get; set; }
 
         /// <summary>
-        /// Gets or set the owin.RequestBody Stream.
+        /// Gets or set the RequestBody Stream.
         /// </summary>
-        /// <returns>The owin.RequestBody Stream.</returns>
+        /// <returns>The RequestBody Stream.</returns>
         public abstract Stream Body { get; set; }
 
         /// <summary>

src/Microsoft.AspNet.Http.Abstractions/IFormCollection.cs

@@ -1,13 +1,95 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Collections.Generic;
+using Microsoft.Extensions.Primitives;
+
 namespace Microsoft.AspNet.Http
 {
     /// <summary>
-    /// Contains the parsed form values.
+    /// Represents the parsed form values sent with the HttpRequest.
     /// </summary>
-    public interface IFormCollection : IReadableStringCollection
+    public interface IFormCollection : IEnumerable<KeyValuePair<string, StringValues>>
     {
+        /// <summary>
+        ///     Gets the number of elements contained in the <see cref="T:Microsoft.AspNet.Http.IFormCollection" />.
+        /// </summary>
+        /// <returns>
+        ///     The number of elements contained in the <see cref="T:Microsoft.AspNet.Http.IFormCollection" />.
+        /// </returns>
+        int Count { get; }
+
+        /// <summary>
+        ///     Gets an <see cref="T:System.Collections.Generic.ICollection`1" /> containing the keys of the 
+        ///     <see cref="T:Microsoft.AspNet.Http.IFormCollection" />.
+        /// </summary>
+        /// <returns>
+        ///     An <see cref="T:System.Collections.Generic.ICollection`1" /> containing the keys of the object
+        ///     that implements <see cref="T:Microsoft.AspNet.Http.IFormCollection" />.
+        /// </returns>
+        ICollection<string> Keys { get; }
+
+        /// <summary>
+        ///     Determines whether the <see cref="T:Microsoft.AspNet.Http.IFormCollection" /> contains an element
+        ///     with the specified key.
+        /// </summary>
+        /// <param name="key">
+        /// The key to locate in the <see cref="T:Microsoft.AspNet.Http.IFormCollection" />.
+        /// </param>
+        /// <returns>
+        ///     true if the <see cref="T:Microsoft.AspNet.Http.IFormCollection" /> contains an element with
+        ///     the key; otherwise, false.
+        /// </returns>
+        /// <exception cref="T:System.ArgumentNullException">
+        ///     key is null.
+        /// </exception>
+        bool ContainsKey(string key);
+
+        /// <summary>
+        ///    Gets the value associated with the specified key.
+        /// </summary>
+        /// <param name="key">
+        ///     The key of the value to get.
+        /// </param>
+        /// <param name="value">
+        ///     The key of the value to get.
+        ///     When this method returns, the value associated with the specified key, if the
+        ///     key is found; otherwise, the default value for the type of the value parameter.
+        ///     This parameter is passed uninitialized.
+        /// </param>
+        /// <returns>
+        ///    true if the object that implements <see cref="T:Microsoft.AspNet.Http.IFormCollection" /> contains
+        ///     an element with the specified key; otherwise, false.
+        /// </returns>
+        /// <exception cref="T:System.ArgumentNullException">
+        ///     key is null.
+        /// </exception>
+        bool TryGetValue(string key, out StringValues value);
+
+        /// <summary>
+        ///     Gets the value with the specified key.
+        /// </summary>
+        /// <param name="key">
+        ///     The key of the value to get.
+        /// </param>
+        /// <returns>
+        ///     The element with the specified key, or <see cref="T:Microsoft.Extensions.Primitives.StringValues" />.Empty if the key is not present.
+        /// </returns>
+        /// <exception cref="T:System.ArgumentNullException">
+        ///     key is null.
+        /// </exception>
+        /// <remarks>
+        ///     <see cref="T:Microsoft.AspNet.Http.IFormCollection" /> has a different indexer contract than 
+        ///     <see cref="T:System.Collections.Generic.IDictionary`2" />, as it will return StringValues.Empty for missing entries
+        ///     rather than throwing an Exception.
+        /// </remarks>
+        StringValues this[string key] { get; }
+
+        /// <summary>
+        /// The file collection sent with the request.
+        /// </summary>
+        /// <param name="key"></param>
+        /// <returns>The files included with the request.</returns>
         IFormFileCollection Files { get; }
     }
 }

src/Microsoft.AspNet.Http.Abstractions/IFormFile.cs

@@ -5,6 +5,9 @@
 
 namespace Microsoft.AspNet.Http
 {
+    /// <summary>
+    /// Represents a file sent with the HttpRequest.
+    /// </summary>
     public interface IFormFile
     {
         string ContentType { get; }

src/Microsoft.AspNet.Http.Abstractions/IFormFileCollection.cs

@@ -5,6 +5,9 @@
 
 namespace Microsoft.AspNet.Http
 {
+    /// <summary>
+    /// Represents the collection of files sent with the HttpRequest.
+    /// </summary>
     public interface IFormFileCollection : IReadOnlyList<IFormFile>
     {
         IFormFile this[string name] { get; }

src/Microsoft.AspNet.Http.Abstractions/IQueryCollection.cs

@@ -0,0 +1,88 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.Primitives;
+
+namespace Microsoft.AspNet.Http
+{
+    /// <summary>
+    ///     Represents the HttpRequest query string collection
+    /// </summary>
+    public interface IQueryCollection : IEnumerable<KeyValuePair<string, StringValues>>
+    {
+        /// <summary>
+        ///     Gets the number of elements contained in the <see cref="T:Microsoft.AspNet.Http.IQueryCollection" />.
+        /// </summary>
+        /// <returns>
+        ///     The number of elements contained in the <see cref="T:Microsoft.AspNet.Http.IQueryCollection" />.
+        /// </returns>
+        int Count { get; }
+
+        /// <summary>
+        ///     Gets an <see cref="T:System.Collections.Generic.ICollection`1" /> containing the keys of the 
+        ///     <see cref="T:Microsoft.AspNet.Http.IQueryCollection" />.
+        /// </summary>
+        /// <returns>
+        ///     An <see cref="T:System.Collections.Generic.ICollection`1" /> containing the keys of the object
+        ///     that implements <see cref="T:Microsoft.AspNet.Http.IQueryCollection" />.
+        /// </returns>
+        ICollection<string> Keys { get; }
+
+        /// <summary>
+        ///     Determines whether the <see cref="T:Microsoft.AspNet.Http.IQueryCollection" /> contains an element
+        ///     with the specified key.
+        /// </summary>
+        /// <param name="key">
+        /// The key to locate in the <see cref="T:Microsoft.AspNet.Http.IQueryCollection" />.
+        /// </param>
+        /// <returns>
+        ///     true if the <see cref="T:Microsoft.AspNet.Http.IQueryCollection" /> contains an element with
+        ///     the key; otherwise, false.
+        /// </returns>
+        /// <exception cref="T:System.ArgumentNullException">
+        ///     key is null.
+        /// </exception>
+        bool ContainsKey(string key);
+
+        /// <summary>
+        ///    Gets the value associated with the specified key.
+        /// </summary>
+        /// <param name="key">
+        ///     The key of the value to get.
+        /// </param>
+        /// <param name="value">
+        ///     The key of the value to get.
+        ///     When this method returns, the value associated with the specified key, if the
+        ///     key is found; otherwise, the default value for the type of the value parameter.
+        ///     This parameter is passed uninitialized.
+        /// </param>
+        /// <returns>
+        ///    true if the object that implements <see cref="T:Microsoft.AspNet.Http.IQueryCollection" /> contains
+        ///     an element with the specified key; otherwise, false.
+        /// </returns>
+        /// <exception cref="T:System.ArgumentNullException">
+        ///     key is null.
+        /// </exception>
+        bool TryGetValue(string key, out StringValues value);
+
+        /// <summary>
+        ///     Gets the value with the specified key.
+        /// </summary>
+        /// <param name="key">
+        ///     The key of the value to get.
+        /// </param>
+        /// <returns>
+        ///     The element with the specified key, or <see cref="T:Microsoft.Extensions.Primitives.StringValues" />.Empty if the key is not present.
+        /// </returns>
+        /// <exception cref="T:System.ArgumentNullException">
+        ///     key is null.
+        /// </exception>
+        /// <remarks>
+        ///     <see cref="T:Microsoft.AspNet.Http.IQueryCollection" /> has a different indexer contract than 
+        ///     <see cref="T:System.Collections.Generic.IDictionary`2" />, as it will return StringValues.Empty for missing entries
+        ///     rather than throwing an Exception.
+        /// </remarks>
+        StringValues this[string key] { get; }
+    }
+}