示例:WPF中应用MarkupExtention自定义ICommand_wpf markupextension-优快云博客

本文链接：https://blog.youkuaiyun.com/u010975589/article/details/139746136

一、目的：应用MarkupExtention定义ICommand，使得应用起来更简单和高效

二、实现

    public abstract class MarkupCommandBase : MarkupExtension, ICommand
    {
        public virtual bool CanExecute(object parameter)
        {
            return true;
        }

        public abstract void Execute(object parameter);

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

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }

三、环境

VS2022

四、示例

自定义一个应用Process.Start路径的Command

public class ProcessCommand : MarkupCommandBase
{
    public string Uri { get; set; }

    public override bool CanExecute(object parameter)
    {
        string uri = parameter?.ToString() ?? this.Uri;
        if (string.IsNullOrEmpty(uri))
            return false;
        bool result = File.Exists(uri) || Directory.Exists(uri);
        if (parameter.ToString().ToUpper().StartsWith("http") == true) 
            return true;
        return result;
    }

    public override void Execute(object parameter)
    {
        string uri = parameter?.ToString() ?? this.Uri;
        Process.Start(new ProcessStartInfo(uri) { UseShellExecute = true });

    }
}

定义一个按钮调用该命令

<Button Content="打开D盘" 
        Style="{DynamicResource {x:Static h:ButtonKeys.Default}}" 
        Command="{h:ProcessCommand}" CommandParameter="D:\"/>

输出结果

点击按钮后显示D盘资源管理器