仅在DataGrid中选择一行时如何启用按钮？

BrunoLM 发表于 Dev

布鲁诺

我有这个标记

<DataGrid Margin="10,10,10,48" AutoGenerateColumns="False" Name="grdUsers"
          ItemsSource="{Binding Users}"
>
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Width="*" Binding="{Binding Name}" />
        <DataGridTextColumn Header="Username" Width="*" Binding="{Binding Username}" />
        <DataGridTextColumn Header="Password" Width="*" Binding="{Binding Password}" />
        <DataGridTextColumn Header="Role" Width="*" Binding="{Binding Path=Role.Name}" />
    </DataGrid.Columns>
</DataGrid>
<Button Content="Add" HorizontalAlignment="Left" Margin="10,0,0,10" Width="75" Height="20" VerticalAlignment="Bottom"/>
<Button Content="Edit" HorizontalAlignment="Left" Margin="90,0,0,10" Width="75" Height="20" VerticalAlignment="Bottom"/>

<Button Content="Remove" Margin="0,0,10,10" Height="20" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="75"
        Command="{Binding Remove}" CommandParameter="{Binding ElementName=grdUsers, Path=SelectedItem}"/>

我的RelayCommand

public class RelayCommand : ICommand
{
    private readonly Action<object> execute = null;
    private readonly Predicate<object> canExecute = null;

    public RelayCommand(Action<object> execute, Predicate<object> canExecute = null)
    {
        this.execute = execute;
        this.canExecute = canExecute;
    }


    #region ICommand members

    public bool CanExecute(object parameter)
    {
        return canExecute == null ? true : canExecute(parameter);
    }

    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {
        execute(parameter);
    } 

    #endregion
}

如果在DataGrid中选择了一项，则我的CanExecute方法RelayCommand返回true。

但是窗口打开时未选择任何项目，从而导致按钮被禁用。如果我在DataGrid上选择某些内容，则不会发生任何事情。

如果已在中选择了行，如何“刷新”按钮DataGrid？

布鲁诺

我将活动更改为

public event EventHandler CanExecuteChanged
{
    add { CommandManager.RequerySuggested += value; }
    remove { CommandManager.RequerySuggested -= value; }
}

现在它正在工作。

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