C# 扩展方法应用_编程设计

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace TaskManager

{

public static class ValidateHelper

{

static ValidateHelper()

{

IsErr = false;

}

public static bool IsErr

{

get;

set;

}

static ErrorProvider ep = new ErrorProvider();

public static bool Validate(this TextBox ctrl, System.Func<TextBox, bool> func, string errmsg)

{

if (!func(ctrl))

{

ep.SetError(ctrl, errmsg);

ctrl.Focus();

return !(IsErr=true);

}

return true;

}

public static bool Validate(this ListBox ctrl, System.Func<ListBox, bool> func, string errmsg)

{

if (!func(ctrl))

{

ep.SetError(ctrl, errmsg);

ctrl.Focus();

return !(IsErr = true);

}

return true;

}

public static void Clear()

{

ep.Clear();

IsErr = false;

}

还是照样上两张图

用法

Code