c# - 暂时取消订阅事件的巧妙解决方案

Question

我正在寻找一种临时取消订阅 WinForm 事件的简洁解决方案。例如，如果我有一个带有以下事件处理程序的 textBox1 控件:

private void textBox1_TextChanged(object sender, EventArgs eventArgs)
{
  // Do something
}

当我以编程方式更改文本框的内容时，我不希望触发此事件。但不要写:

  try
  {
    textBox1.TextChanged -= textBox1_TextChanged;
    // Change textbox contents without triggering event
  }
  finally
  {
    textBox1.TextChanged += textBox1_TextChanged;
  }

我正在寻找可以使用类似于此的东西:

using(new EventInhibitor(textBox1.TextChanged, textBox1_TextChanged))
{
  // Change textbox contents without triggering event
}

问题是如何将 textBox1.TextChanged 事件传递给构造函数？反射？表达式？

public class EventInhibitor : IDisposable
{
  private bool _disposed = false;
  private XXX _event;
  private EventHandler _handler;

  public EventInhibitor(XXX event, EventHandler handler)
  {
    _event   = event;
    _handler = handler;
    _event -= _handler;
  }

  public void Dispose()
  {
    if(_disposed)
      return:
    _event += _handler;
    _event = null;
    _handler = null;
    _disposed = true;
  }
}

Answer 1

另一种解决方案..仅在之前和之后调用函数:

public class EventInhibitor : IDisposable {
    private bool _disposed;
    private Action _after;

    public EventInhibitor(Action before, Action after)
    {
        before();
        _after = after;
    }

    public void Dispose() {
        if (_disposed)
            return;

        _disposed = true;
        _after();
    }
}

用法:

using(new EventInhibitor(() => textBox1.TextChanged -= textBox1_TextChanged, 
                         () => textBox1.TextChanged += textBox1_TextChanged)) {
}