WPF/C# 中的异步任务和 RoutedEventHandler 出现问题

Question

我有一个带有按钮的用户控件，该按钮用于 Window 和 RoutedEventHandler:

用户控件：

public event RoutedEventHandler IniciarPLC_Click;
private void BtnIniciarPLC_Click(object sender, RoutedEventArgs e)
{
   .....
   if (IniciarPLC_Click != null)
   {
        IniciarPLC_Click(this, new RoutedEventArgs());
   }
   ......
}

Window:

XAML:

<ucUserControl x:Name="cntBarraHerramientas"  IniciarPLC_Click="CntBarraHerramientas_IniciarPLC_Click"/>

C#:

private void CntBarraHerramientas_IniciarPLC_Click(object sender, RoutedEventArgs e)
{
    ....       
}

但我需要调用 CntBarraHerramientas_IniciarPLC_Click 中的 async 方法，所以我将 void return 类型更改为 async Task 并调用该方法await:

private async Task CntBarraHerramientas_IniciarPLC_Click(object sender, RoutedEventArgs e)
{
    await AsyncMethod(...);
}

我有这个错误：

Could not create a 'IniciarPLC_Click' from the text 'CntBarraHerramientas_IniciarPLC_Click'. ' ArgumentException: You cannot link to the target method because its security transparency or signature is not compatible with that of the delegated type.

问题是如何使用 RoutedEventHandler 调用 async 方法？因为从 Button 单击事件调用的 async 方法有效。

Answer 1

事件处理程序应该是 async void。这是少数几个 async void 而不是 async Task

的地方之一

WPF/C# 中的异步任务和 RoutedEventHandler 出现问题

Trouble with Async Task and RoutedEventHandler in WPF/C#

c#

wpf

routed-events

async-await