Merge pull request #2719 from Maxwe11/ArgumentNullException-msg

Pass message to ArgumentNullException in ReadAsync/WriteAsync

Author: stephentoub

src/System.IO.FileSystem/src/System/IO/FileStream.cs

@@ -224,7 +224,7 @@ public override int Read(byte[] buffer, int offset, int count)
         public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
             if (buffer == null)
-                throw new ArgumentNullException("buffer");
+                throw new ArgumentNullException("buffer", SR.ArgumentNull_Buffer);
             if (offset < 0)
                 throw new ArgumentOutOfRangeException("offset", SR.ArgumentOutOfRange_NeedNonNegNum);
             if (count < 0)
@@ -266,7 +266,7 @@ public override void Write(byte[] buffer, int offset, int count)
         public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
             if (buffer == null)
-                throw new ArgumentNullException("buffer");
+                throw new ArgumentNullException("buffer", SR.ArgumentNull_Buffer);
             if (offset < 0)
                 throw new ArgumentOutOfRangeException("offset", SR.ArgumentOutOfRange_NeedNonNegNum);
             if (count < 0)

src/System.IO.Pipes/src/System/IO/Pipes/PipeStream.cs

@@ -142,7 +142,7 @@ public override int Read([In, Out] byte[] buffer, int offset, int count)
         public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
             if (buffer == null)
-                throw new ArgumentNullException("buffer");
+                throw new ArgumentNullException("buffer", SR.ArgumentNull_Buffer);
             if (offset < 0)
                 throw new ArgumentOutOfRangeException("offset", SR.ArgumentOutOfRange_NeedNonNegNum);
             if (count < 0)
@@ -200,7 +200,7 @@ public override void Write(byte[] buffer, int offset, int count)
         public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
             if (buffer == null)
-                throw new ArgumentNullException("buffer");
+                throw new ArgumentNullException("buffer", SR.ArgumentNull_Buffer);
             if (offset < 0)
                 throw new ArgumentOutOfRangeException("offset", SR.ArgumentOutOfRange_NeedNonNegNum);
             if (count < 0)