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AnonymousPipeServerStream.ReadMode Property

Sets the reading mode for the AnonymousPipeServerStream object. For anonymous pipes, transmission mode must be Byte.

Namespace:  System.IO.Pipes
Assembly:  System.Core (in System.Core.dll)
public override PipeTransmissionMode ReadMode { set; }

Property Value

Type: System.IO.Pipes.PipeTransmissionMode
The reading mode for the AnonymousPipeServerStream object.

The transmission mode is not valid. For anonymous pipes, only Byte is supported.


The property is set to Message, which is not supported for anonymous pipes.


The connection is broken or another I/O error occurs.


The pipe is closed.

Anonymous pipes do not support Message read mode.

The following example demonstrates a way to send a string from a parent process to a child process by using anonymous pipes. In this example, the NotSupportedException is caught when the ReadMode property is set to Message.

using System;
using System.IO;
using System.IO.Pipes;
using System.Diagnostics;

class PipeServer
    static void Main()
        Process pipeClient = new Process();

        pipeClient.StartInfo.FileName = "pipeClient.exe";

        using (AnonymousPipeServerStream pipeServer =
            new AnonymousPipeServerStream(PipeDirection.Out,
            // Show that anonymous pipes do not support Message mode. 
                Console.WriteLine("[SERVER] Setting ReadMode to \"Message\".");
                pipeServer.ReadMode = PipeTransmissionMode.Message;
            catch (NotSupportedException e)
                Console.WriteLine("[SERVER] Exception:\n    {0}", e.Message);

            Console.WriteLine("[SERVER] Current TransmissionMode: {0}.",

            // Pass the client process a handle to the server.
            pipeClient.StartInfo.Arguments =
            pipeClient.StartInfo.UseShellExecute = false;


                // Read user input and send that to the client process. 
                using (StreamWriter sw = new StreamWriter(pipeServer))
                    sw.AutoFlush = true;
                    // Send a 'sync message' and wait for client to receive it.
                    // Send the console input to the client process.
                    Console.Write("[SERVER] Enter text: ");
            // Catch the IOException that is raised if the pipe is broken 
            // or disconnected. 
            catch (IOException e)
                Console.WriteLine("[SERVER] Error: {0}", e.Message);

        Console.WriteLine("[SERVER] Client quit. Server terminating.");

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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