C# 如何在C中更好地将continueWith替换为async/await

我有C代码：

但是TaskDisposeTokenUner没有字段结果，并且您不能像这样编写等待taskCompletionSource.Task.Result。 如何最好地替换此代码

在任务中使用时，得到的值是任务的结果

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因此，在您的情况下，TaskDisposeTokenUner已经是您要查找的UserActionResult值。您只需返回TaskDisposeTokenUner即可。

您的原始方法具有同步签名；该方法中除委托之外的所有代码都将立即执行。ContinueWith委托是taskCompletionSource.Task完成之后执行的唯一代码。因此，要复制此行为，您需要将ContinueWith委托移动到方法的末尾，这样所有同步代码都会像以前一样首先执行：

public async Task<TestClass> WaitForUserInput(IResource resource, CancellationToken token)
{
  var button = resource.GetResource();

  var taskCompletionSource = new TaskCompletionSource<UserActionResult>();
  IDisposable cancellationTokenReg = token.Register(
                                      () => taskCompletionSource.SetResult(new TestClass()));

  button.TouchEvent += Subscribe;
  button.Disabled = true;

  var result = await taskCompletionSource.Task;
  cancellationTokenReg.Dispose();
  return result;
}

var taskDisposeTokenUnner应该已经是结果-您检查过它的类型了吗？

public class SimpleClass{

    public async Task<TestClass> WaitForUserInput(IResource resource, CancellationToken token)
    {
        var button = resource.GetResource();

        var taskCompletionSource = new TaskCompletionSource<UserActionResult>();
        IDisposable cancellationTokenReg = token.Register(
                                      () => taskCompletionSource.SetResult(new TestClass()));

        var taskDisposeTokenUnreg = await taskCompletionSource.Task
        cancellationTokenReg.Dispose();
        return taskDisposeTokenUnreg.Result;

        button.TouchEvent += Subscribe;
        button.Disabled = true;

        return taskDisposeTokenUnreg;
    }
}     

public async Task<TestClass> WaitForUserInput(IResource resource, CancellationToken token)
{
  var button = resource.GetResource();

  var taskCompletionSource = new TaskCompletionSource<UserActionResult>();
  IDisposable cancellationTokenReg = token.Register(
                                      () => taskCompletionSource.SetResult(new TestClass()));

  button.TouchEvent += Subscribe;
  button.Disabled = true;

  var result = await taskCompletionSource.Task;
  cancellationTokenReg.Dispose();
  return result;
}

public async Task<TestClass> WaitForUserInput(IResource resource, CancellationToken token)
{
  var button = resource.GetResource();

  var taskCompletionSource = new TaskCompletionSource<UserActionResult>();
  using var cancellationTokenReg = token.Register(
                                      () => taskCompletionSource.SetResult(new TestClass()));

  button.TouchEvent += Subscribe;
  button.Disabled = true;

  return await taskCompletionSource.Task;
}