c# - 如何防止多次连续按下 'Enter'键

Question

我有一个按钮，当我通过键盘按Enter键时，将执行button命令。当我连续按Enter键时，该命令还会执行多次，这是我不希望的。

我想将行为限制为即使在多次按下“Enter”键时也只能执行一次命令。有人可以帮忙吗？

View.xaml

<Button x:Name="btnSearch" IsDefault="True"  Content="Search"  Command="{Binding SearchButtonCommand}">
      <Button.InputBindings>
          <KeyBinding Command="{Binding Path=SearchButtonCommand}" Key="Return" />
      </Button.InputBindings>
</Button>

ViewModel.cs

public ICommand SearchButtonCommand
{
 get { return new DelegateCommand(SearchButtonExecutionLogic); }
}

Answer 1

达到目标的最简单方法是在ViewModel的命令实现中引入并检查一些标志isSearchRunning:

private bool isSearchRunning = false;
private void SearchButtonCommandImpl()
{
    if (isSearchRunning)
    {
        return;
    }
    try
    {
        isSearchRunning = true;
        //Do stuff
    }
    finally
    {
        isSearchRunning = false;
    }
}