c# - 使用命令将参数传递到 View 模型

Question

我无法将参数从我的 View 发送到我的 View 模型。

View.xaml:

在我看来，我有以下几点:

<TextBox
    MinWidth="70"
    Name="InputId"/>

<Button 
    Command="{Binding ButtonCommand}"
    CommandParameter="{Binding ElementName=InputId}"
    Content="Add"/>

View.xaml.cs:

public MyView()
{
    InitializeComponent();
}

public MyView(MyViewModel viewModel) : this()
{
    DataContext = viewModel;
}

MyViewModel.cs:

public class MyViewModel : BindableBase
{
    public ICommand ButtonCommand { get; private set; }

    public MyViewModel()
    {
        ButtonCommand = new DelegateCommand(ButtonClick);
    }

    private void ButtonClick()
    {
        //Read 'InputId' somehow. 
        //But DelegateCommand does not allow the method to contain parameters.
    }
}

有什么建议吗，当我点击按钮到我的 View 模型时，如何传递 InputId？

Answer 1

您需要添加 <object>像这样给你的委托(delegate)命令:

public ICommand ButtonCommand { get; private set; }

     public MyViewModel()
        {
            ButtonCommand = new DelegateCommand<object>(ButtonClick);
        }

        private void ButtonClick(object yourParameter)
        {
            //Read 'InputId' somehow. 
            //But DelegateCommand does not allow the method to contain parameters.
        }

是否要获取文本框的文本，将 xaml 更改为:

CommandParameter="{Binding Text,ElementName=InputId}"