Imported Upstream version 5.18.0.142

Former-commit-id: 7467d4b717762eeaf652d77f1486dd11ffb1ff1f

mcs/class/System.Core/System.IO.Pipes/NamedPipeClientStream.NotSupported.cs

@@ -0,0 +1,41 @@
+using Microsoft.Win32.SafeHandles;
+using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.InteropServices;
+using System.Net.Sockets;
+using System.Security;
+using System.Threading;
+using System.Security.Principal;
+
+namespace System.IO.Pipes
+{
+	/// <summary>
+	/// Named pipe client. Use this to open the client end of a named pipes created with 
+	/// NamedPipeServerStream.
+	/// </summary>
+	public sealed partial class NamedPipeClientStream : PipeStream
+	{
+		public NamedPipeClientStream (string serverName, string pipeName, PipeAccessRights desiredAccessRights, PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability)
+			: base (PipeDirection.In, 0)
+		{
+			throw new PlatformNotSupportedException ();
+		}
+
+		private bool TryConnect (int timeout, CancellationToken cancellationToken)
+		{
+			throw new PlatformNotSupportedException ();
+		}
+
+		public int NumberOfServerInstances
+		{
+			get {
+				throw new PlatformNotSupportedException ();
+			}
+		}
+
+		private void ValidateRemotePipeUser (SafePipeHandle handle)
+		{
+			throw new PlatformNotSupportedException ();
+		}
+	}
+}