C# 无法将 lambda 表达式转换为类型“System.Delegate”
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Cannot convert lambda expression to type 'System.Delegate'
提问by mpen
Neither of these work:
这些都不起作用：
_uiDispatcher.Invoke(() => { });
_uiDispatcher.Invoke(delegate() { });
All I want to do is Invoke an inline method on my main UI thread. So I called this on the main thread:
我想要做的就是在我的主 UI 线程上调用一个内联方法。所以我在主线程上调用了这个：
_uiDispatcher = Dispatcher.CurrentDispatcher;
And now I want to execute some code on that thread from another thread. How do I do it? Am I using the wrong syntax?
现在我想从另一个线程在该线程上执行一些代码。我该怎么做？我使用了错误的语法吗？
Note that this is nota WPF application; I've referenced WindowsBaseso I could get access to the Dispatcherclass.
请注意，这不是WPF 应用程序；我已经引用了，WindowsBase所以我可以访问这个Dispatcher类。
采纳答案by thecoop
The problem is that you aren't providing the exact typeof delegate you want to invoke. Dispatcher.Invokejust takes a Delegate. Is it an Action<T>? If so, what is T? Is it a MethodInvoker? Action? What?
问题是您没有提供要调用的委托的确切类型。Dispatcher.Invoke只需要一个Delegate. 它是Action<T>? 如果是，那是T什么？是MethodInvoker吗？Action? 什么？
If your delegate takes no arguments and returns nothing, you can use Actionor MethodInvoker. Try this:
如果您的委托不接受任何参数并且不返回任何内容，您可以使用Action或MethodInvoker。尝试这个：
_uiDispatcher.Invoke(new Action(() => { }));
回答by IAbstract
Unless I've missed something, all you've told us is this is not a WPF application. I don't think the Dispatcher is the correct class to use.
除非我遗漏了什么，您告诉我们的只是这不是 WPF 应用程序。我认为 Dispatcher 不是正确使用的类。
If this is a WinForm app, your UI thread can be accessed via the WindowsFormsSynchronizationContext
如果这是一个 WinForm 应用程序，则可以通过WindowsFormsSynchronizationContext访问您的 UI 线程
回答by Narottam Goyal
this.Dispatcher.Invoke((Action)(() => { textBox1.Text = "Test 123"; }));
