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ProcessStartInfo::RedirectStandardInput Property

Gets or sets a value indicating whether the input for an application is read from the Process::StandardInput stream.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

public:
property bool RedirectStandardInput {
	bool get ();
	void set (bool value);
}

Property Value

Type: System::Boolean
true if input should be read from Process::StandardInput; otherwise, false. The default is false.

A Process can read input text from its standard input stream, typically the keyboard. By redirecting the StandardInput stream, you can programmatically specify the input of a process. For example, instead of using keyboard input, you can provide text from the contents of a designated file or output from another application.

NoteNote

You must set UseShellExecute to false if you want to set RedirectStandardInput to true. Otherwise, writing to the StandardInput stream throws an exception.

The following example illustrates how to redirect the StandardInput stream of a process. The sort command is a console application that reads and sorts text input.

The example starts the sort command with redirected input. It then prompts the user for text, and passes the text to the sort process through the redirected StandardInput stream. The sort results are displayed to the user on the console.

#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Diagnostics;
using namespace System::ComponentModel;
int main()
{
   Console::WriteLine(  "Ready to sort one or more text lines..." );

   // Start the Sort.exe process with redirected input. 
   // Use the sort command to sort the input text.
   Process^ myProcess = gcnew Process;
   if ( myProcess )
   {
      myProcess->StartInfo->FileName =  "Sort.exe";
      myProcess->StartInfo->UseShellExecute = false;
      myProcess->StartInfo->RedirectStandardInput = true;
      myProcess->Start();
      StreamWriter^ myStreamWriter = myProcess->StandardInput;
      if ( myStreamWriter )
      {

         // Prompt the user for input text lines to sort.  
         // Write each line to the StandardInput stream of 
         // the sort command.
         String^ inputText;
         int numLines = 0;
         do
         {
            Console::WriteLine(  "Enter a line of text (or press the Enter key to stop):" );
            inputText = Console::ReadLine();
            if ( inputText && inputText->Length > 0 )
            {
               numLines++;
               myStreamWriter->WriteLine( inputText );
            }
         }
         while ( inputText && inputText->Length != 0 );

         // Write a report header to the console. 
         if ( numLines > 0 )
         {
            Console::WriteLine(  " {0} sorted text line(s) ", numLines.ToString() );
            Console::WriteLine(  "------------------------" );
         }
         else
         {
            Console::WriteLine(  " No input was sorted" );
         }

         // End the input stream to the sort command. 
         // When the stream closes, the sort command 
         // writes the sorted text lines to the  
         // console.
         myStreamWriter->Close();
      }

      // Wait for the sort process to write the sorted text lines.
      myProcess->WaitForExit();
      myProcess->Close();
   }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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