Move P/Invokes to NativeMethods class (#1443)

Author: nxtn

snippets/cpp/VS_Snippets_CLR/conceptual.interop.marshaling/cpp/systime.cpp

@@ -16,12 +16,12 @@ public ref class SystemTime
     unsigned short millisecond;
 };
 
-public class LibWrap
+public class NativeMethods
 {
 public:
     // Declares a managed prototype for the unmanaged function using Platform Invoke.
     [DllImport("Kernel32.dll")]
-    static void GetSystemTime([In,Out] SystemTime^ st);
+    static void GetSystemTime([In, Out] SystemTime^ st);
 };
 
 public class App
@@ -31,9 +31,9 @@ public class App
     {
         Console::WriteLine("C++/CLI SysTime Sample using Platform Invoke");
         SystemTime^ st = gcnew SystemTime();
-        LibWrap::GetSystemTime(st);
+        NativeMethods::GetSystemTime(st);
         Console::Write("The Date is: ");
-        Console::Write("{0} {1} {2}",  st->month, st->day, st->year);
+        Console::Write("{0} {1} {2}", st->month, st->day, st->year);
     }
 };
 

snippets/csharp/VS_Snippets_CLR/conceptual.interop.marshaling/cs/systime.cs

@@ -15,11 +15,11 @@ public class SystemTime
     public ushort millisecond;
 }
 
-public class LibWrap
+internal static class NativeMethods
 {
     // Declares a managed prototype for the unmanaged function using Platform Invoke.
     [DllImport("Kernel32.dll")]
-    public static extern void GetSystemTime([In, Out] SystemTime st);
+    internal static extern void GetSystemTime([In, Out] SystemTime st);
 }
 
 public class App
@@ -28,9 +28,9 @@ public static void Main()
     {
         Console.WriteLine("C# SysTime Sample using Platform Invoke");
         SystemTime st = new SystemTime();
-        LibWrap.GetSystemTime(st);
+        NativeMethods.GetSystemTime(st);
         Console.Write("The Date is: ");
-        Console.Write("{0} {1} {2}", st.month, st.day, st.year);
+        Console.Write($"{st.month} {st.day} {st.year}");
     }
 }
 

snippets/visualbasic/VS_Snippets_CLR/conceptual.interop.marshaling/vb/systime.vb

@@ -14,18 +14,18 @@ Public Class SystemTime
     Public millisecond As Short
 End Class 'SystemTime
 
-Public Class LibWrap
+Friend Class NativeMethods
     ' Declares a managed prototype for the unmanaged function.
-    Declare Sub GetSystemTime Lib "Kernel32.dll" (
+    Friend Declare Sub GetSystemTime Lib "Kernel32.dll" (
         <[In](), Out()> ByVal st As SystemTime)
 End Class 'LibWrap
 
 Public Class App
     Public Shared Sub Main()
         Console.WriteLine("VB .NET SysTime Sample using Platform Invoke")
         Dim st As New SystemTime()
-        LibWrap.GetSystemTime(st)
-        Console.Write("The Date is: {0} {1} {2}", st.month, st.day, st.year)
+        NativeMethods.GetSystemTime(st)
+        Console.Write($"The Date is: {st.month} {st.day} {st.year}")
     End Sub 'Main
 End Class 'App