Process.OutputDataReceived 事件

public:
 event System::Diagnostics::DataReceivedEventHandler ^ OutputDataReceived;

public event System.Diagnostics.DataReceivedEventHandler? OutputDataReceived;

public event System.Diagnostics.DataReceivedEventHandler OutputDataReceived;

[System.ComponentModel.Browsable(true)]
public event System.Diagnostics.DataReceivedEventHandler OutputDataReceived;

member this.OutputDataReceived : System.Diagnostics.DataReceivedEventHandler 

[<System.ComponentModel.Browsable(true)>]
member this.OutputDataReceived : System.Diagnostics.DataReceivedEventHandler 

Public Custom Event OutputDataReceived As DataReceivedEventHandler 

Public Event OutputDataReceived As DataReceivedEventHandler 

事件类型

属性

BrowsableAttribute

示例

以下示例演示如何对命令的StandardOutputipconfig重定向流执行异步读取操作。

该示例为 OutputHandler 事件处理程序创建一个事件委托，并将其与事件 OutputDataReceived 相关联。 事件处理程序从重定向 StandardOutput 的流接收文本行，设置文本的格式，并将其保存在稍后在示例控制台窗口中显示的输出字符串中。

using System;
using System.IO;
using System.Diagnostics;
using System.Text;

class StandardAsyncOutputExample
{
    private static int lineCount = 0;
    private static StringBuilder output = new StringBuilder();

    public static void Main()
    {
        Process process = new Process();
        process.StartInfo.FileName = "ipconfig.exe";
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
        {
            // Prepend line numbers to each line of the output.
            if (!String.IsNullOrEmpty(e.Data))
            {
                lineCount++;
                output.Append("\n[" + lineCount + "]: " + e.Data);
            }
        });

        process.Start();

        // Asynchronously read the standard output of the spawned process.
        // This raises OutputDataReceived events for each line of output.
        process.BeginOutputReadLine();
        process.WaitForExit();

        // Write the redirected output to this application's window.
        Console.WriteLine(output);

        process.WaitForExit();
        process.Close();

        Console.WriteLine("\n\nPress any key to exit.");
        Console.ReadLine();
    }
}

open System
open System.Diagnostics
open System.Text

let mutable lineCount = 0
let output = StringBuilder()

let proc = new Process()
proc.StartInfo.FileName <- "ipconfig.exe"
proc.StartInfo.UseShellExecute <- false
proc.StartInfo.RedirectStandardOutput <- true

proc.OutputDataReceived.AddHandler(
    DataReceivedEventHandler(fun _ e ->
        // Prepend line numbers to each line of the output.
        if not (String.IsNullOrEmpty e.Data) then
            lineCount <- lineCount + 1
            output.Append $"\n[{lineCount}]: {e.Data}" |> ignore)
)


proc.Start() |> ignore

// Asynchronously read the standard output of the spawned process.
// This raises OutputDataReceived events for each line of output.
proc.BeginOutputReadLine()
proc.WaitForExit()

// Write the redirected output to this application's window.
printfn $"{output}"

proc.WaitForExit()
proc.Close()

printfn "\n\nPress any key to exit."
stdin.ReadLine() |> ignore

Imports System.IO
Imports System.Diagnostics
Imports System.Text

Module Module1
    Dim lineCount As Integer = 0
    Dim output As StringBuilder = New StringBuilder()

    Sub Main()
        Dim process As New Process()
        process.StartInfo.FileName = "ipconfig.exe"
        process.StartInfo.UseShellExecute = False
        process.StartInfo.RedirectStandardOutput = True
        AddHandler process.OutputDataReceived, AddressOf OutputHandler
        process.Start()

        ' Asynchronously read the standard output of the spawned process. 
        ' This raises OutputDataReceived events for each line of output.
        process.BeginOutputReadLine()
        process.WaitForExit()

        Console.WriteLine(output)

        process.WaitForExit()
        process.Close()

        Console.WriteLine(Environment.NewLine + Environment.NewLine + "Press any key to exit.")
        Console.ReadLine()
    End Sub

    Sub OutputHandler(sender As Object, e As DataReceivedEventArgs)
        If Not String.IsNullOrEmpty(e.Data) Then
            lineCount += 1

            ' Add the text to the collected output.
            output.Append(Environment.NewLine + "[" + lineCount.ToString() + "]: " + e.Data)
        End If
    End Sub
End Module

注解

该 OutputDataReceived 事件指示关联 Process 已将以换行符（回车符（CR）、换行符（LF 或 CR+LF）终止的行写入其重定向 StandardOutput 流。

在异步读取操作期间 StandardOutput启用该事件。 若要启动异步读取操作，必须重定向 StandardOutput 流 Process，将事件处理程序添加到 OutputDataReceived 事件，然后调用 BeginOutputReadLine。 此后，每当进程向重定向OutputDataReceived流写入一行时，StandardOutput事件都会发出信号，直到进程退出或调用CancelOutputRead。

另请参阅

• RedirectStandardOutput
• StandardOutput
• BeginOutputReadLine()
• CancelOutputRead()
• DataReceivedEventHandler