ProcessStartInfo.RedirectStandardInput 属性
定义
重要
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获取或设置指示应用程序的输入是否从 StandardInput 流中读取的值。
public:
property bool RedirectStandardInput { bool get(); void set(bool value); };public bool RedirectStandardInput { get; set; }member this.RedirectStandardInput : bool with get, setPublic Property RedirectStandardInput As Boolean属性值
如果应从 StandardInput 读取输入，则为 true；否则为 false。 默认值为 false。
示例
以下示例演示如何重定向 StandardInput 进程的流。 命令 sort 是一个控制台应用程序，用于读取和排序文本输入。
该示例使用重定向的 sort 输入启动命令。 然后，它会提示用户输入文本，并通过重定向StandardInput的sort流将文本传递给进程。 结果 sort 在控制台上向用户显示。
#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();
}
}
using System;
using System.IO;
using System.Diagnostics;
using System.ComponentModel;
namespace ProcessStandardInputSample
{
class StandardInputTest
{
static void 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.
using (Process myProcess = new Process())
{
myProcess.StartInfo.FileName = "Sort.exe";
myProcess.StartInfo.UseShellExecute = false;
myProcess.StartInfo.RedirectStandardInput = true;
myProcess.Start();
StreamWriter myStreamWriter = myProcess.StandardInput;
// 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.Length > 0)
{
numLines++;
myStreamWriter.WriteLine(inputText);
}
} while (inputText.Length > 0);
// Write a report header to the console.
if (numLines > 0)
{
Console.WriteLine($" {numLines} sorted text line(s) ");
Console.WriteLine("------------------------");
}
else
{
Console.WriteLine(" No input was sorted");
}
// End the input stream to the sort command.
// When the stream closes, the sort command
// writes the sorted text lines to the
// console.
myStreamWriter.Close();
// Wait for the sort process to write the sorted text lines.
myProcess.WaitForExit();
}
}
}
}
Imports System.IO
Imports System.Diagnostics
Imports System.ComponentModel
Namespace Process_StandardInput_Sample
Class StandardInputTest
Shared Sub Main()
Console.WriteLine("Ready to sort one or more text lines...")
' Start the Sort.exe process with redirected input.
' Use the sort command to sort the input text.
Using myProcess As New Process()
myProcess.StartInfo.FileName = "Sort.exe"
myProcess.StartInfo.UseShellExecute = False
myProcess.StartInfo.RedirectStandardInput = True
myProcess.Start()
Dim myStreamWriter As StreamWriter = myProcess.StandardInput
' Prompt the user for input text lines to sort.
' Write each line to the StandardInput stream of
' the sort command.
Dim inputText As String
Dim numLines As Integer = 0
Do
Console.WriteLine("Enter a line of text (or press the Enter key to stop):")
inputText = Console.ReadLine()
If inputText.Length > 0 Then
numLines += 1
myStreamWriter.WriteLine(inputText)
End If
Loop While inputText.Length <> 0
' Write a report header to the console.
If numLines > 0 Then
Console.WriteLine($" {numLines} sorted text line(s) ")
Console.WriteLine("------------------------")
Else
Console.WriteLine(" No input was sorted")
End If
' 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()
End Using
End Sub
End Class 'StandardInputTest
End Namespace 'Process_StandardInput_Sample
注解
Process可以从其标准输入流（通常是键盘）读取输入文本。 通过重定向 StandardInput 流，可以编程方式指定进程的输入。 例如，你可以提供指定文件的内容中的文本或另一个应用程序的输出，而不是使用键盘输入。
注意
如果要将 设置为 UseShellExecute ，则必须将 设置为 RedirectStandardInputtrue。false 否则，写入 StandardInput 流会引发异常。
