ContentDialog - 用于 SecondButtonCommand 的内容

Question

我正在创建一个通用的异常消息对话框，并且想要有一个“复制错误”按钮来将错误文本复制到剪贴板。我不知道SecondaryButtonCommand = ICommand 的用途。

我所有关于使用 WinUI 3 实现 ICommand 的研究最终都以 RelayCommand 和 MVVM Toolkit 的某些变体为基础，但我无法开始工作。

我可以使用“复制到剪贴板”功能。我现在希望当用户单击对话框上的按钮时发生这种情况。

请注意，此对话框是在代码中其自己的类中创建的，旨在从任何页面使用。

SecondaryButtonCommand = ???

我该用什么

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using System;
using Windows.ApplicationModel.DataTransfer;

namespace JimPrototypes2.Helpers
{
   public static class ErrorDialog 
    {
         public static void Show(XamlRoot root,  string message, string stackTrace)
        {
            string msg = message + Environment.NewLine + Environment.NewLine + stackTrace;
   
            ContentDialog err = new ContentDialog()
            {
                XamlRoot = root,
                Title = "An Error Has Occured",
                Content = msg,
                CloseButtonText = "Ok",
                SecondaryButtonText = "Copy Error",
                SecondaryButtonCommand = ???????      
            };

            err.ShowAsync();

            // Just testing copy to clipboard
            DataPackage package = new DataPackage();
            package.SetText(msg);
            Clipboard.SetContent(package);
        }      
    }
}

Answer 1

最终遇到了一个有帮助的 ICommand 示例。当我看到一个简单、实用的示例后，发现它真的很容易。

这是我的 ICommand，名为 CopyCommand

using System;
using System.Windows.Input;
using Windows.ApplicationModel.DataTransfer;

namespace JimPrototypes2.Helpers
{
    class CopyCommand : ICommand
    {
        string _copyText;

        public CopyCommand(string input)
        {
            _copyText = input;
        }
        public bool CanExecute(object parameter)
        {
            return true;
        }
        public void Execute(object parameter)
        {
            DataPackage package = new DataPackage();
            package.SetText(_copyText);
            Clipboard.SetContent(package);
        }

        public event EventHandler CanExecuteChanged;
    }
}

我更新的 ErrorDialog 类

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using System;

namespace JimPrototypes2.Helpers
{
   public static class ErrorDialog 
    {
         public static void Show(XamlRoot root,  string message, string stackTrace)
        {
            string msg = message + Environment.NewLine + Environment.NewLine + stackTrace;

            CopyCommand cmd = new CopyCommand(msg);

            ContentDialog err = new ContentDialog()
            {
                XamlRoot = root,
                Title = "An Error Has Occured",
                Content = msg,
                CloseButtonText = "Ok",
                SecondaryButtonText = "Copy Error",
                SecondaryButtonCommand = cmd      
            };

            err.ShowAsync();
        }      
    }
}

并在BackgroundWorker线程的try catch块中使用它

 private void _backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
 {
     try
     {
         _backup.Backup(_folders);
     }
     catch (Exception ex)
     {
         DispatcherQueue.TryEnqueue(() => {  
             ErrorDialog.Show(this.XamlRoot, ex.Message, ex.StackTrace);                  
         });
     }
 }