在RichTextBox mvvm中使用wpf工具包在插入符号处插入文本

// 在ViewModel中定义InsertTextCommand命令类
public class InsertTextCommand : ICommand
{
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        if (parameter is RichTextBox richTextBox)
        {
            TextPointer caretPosition = richTextBox.CaretPosition;
            caretPosition.InsertTextInRun("要插入的文本");
        }
    }
}

// 在ViewModel中创建InsertTextCommand的实例
public class MyViewModel
{
    public ICommand InsertTextCommand { get; }

    public MyViewModel()
    {
        InsertTextCommand = new InsertTextCommand();
    }
}

// 在XAML中将RichTextBox控件与InsertTextCommand命令进行绑定
<RichTextBox>
    <Button Content="插入文本" Command="{Binding InsertTextCommand}" CommandParameter="{Binding ElementName=MyRichTextBox}" />
</RichTextBox>