如何在.NET中非同步等待進程退出而不阻塞？

帶有事件的非同步Process.WaitForExit()

詢問Process.WaitForExit() 的非發現阻塞替代方案導致了這一發現有價值的事件驅動方法。這種非同步模式與 .NET 4.0/C# 5 及更高版本特別相關，提供了優雅的解決方案。

請考慮以下程式碼片段：

/// <summary>
/// Waits asynchronously for the process to exit.
/// </summary>
/// <param name="process">The process to wait for cancellation.</param>
/// <param name="cancellationToken">A cancellation token. If invoked, the task will return
/// immediately as canceled.</param>
/// <returns>A Task representing waiting for the process to end.</returns>
public static Task WaitForExitAsync(this Process process,
    CancellationToken cancellationToken = default(CancellationToken))
{
    if (process.HasExited) return Task.CompletedTask;

    var tcs = new TaskCompletionSource<object>();
    process.EnableRaisingEvents = true;
    process.Exited += (sender, args) => tcs.TrySetResult(null);
    if (cancellationToken != default(CancellationToken))
        cancellationToken.Register(() => tcs.SetCanceled());

    return process.HasExited ? Task.CompletedTask : tcs.Task;
}

要使用此非同步方法，只需呼叫它如下所示：

public async void Test()
{
   var process = new Process("processName");
   process.Start();
   await process.WaitForExitAsync();

   //Do some fun stuff here...
}

透過採用這種事件驅動的非同步方法，您可以有效地監控流程完成情況，而無需損害UI 回應能力。

以上是如何在.NET中非同步等待進程退出而不阻塞？的詳細內容。更多資訊請關注PHP中文網其他相關文章！