Process.OutputDataReceived Händelse

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

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

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

Public Custom Event OutputDataReceived As DataReceivedEventHandler 

Public Event OutputDataReceived As DataReceivedEventHandler 

Händelsetyp

Attribut

BrowsableAttribute

Exempel

I följande exempel visas hur du utför asynkrona läsåtgärder på kommandots omdirigerade StandardOutput ström ipconfig .

Exemplet skapar en händelsedelegat för OutputHandler händelsehanteraren och associerar den med OutputDataReceived händelsen. Händelsehanteraren tar emot textrader från den omdirigerade StandardOutput strömmen, formaterar texten och sparar den i en utdatasträng som senare visas i exemplets konsolfönster.

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

Kommentarer

Händelsen OutputDataReceived anger att den associerade Process har skrivit en rad som avslutas med en ny rad (vagnretur (CR), radmatning (LF) eller CR+LF) till dess omdirigerade StandardOutput ström.

Händelsen aktiveras under asynkrona läsåtgärder på StandardOutput. Om du vill starta asynkrona läsåtgärder måste du omdirigera StandardOutput strömmen för en Process, lägga till händelsehanteraren i OutputDataReceived händelsen och anropa BeginOutputReadLine. Därefter OutputDataReceived signalerar händelsen varje gång processen skriver en rad till den omdirigerade StandardOutput strömmen tills processen avslutas eller anropar CancelOutputRead.

Se även

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