在运行时显示maskedtextbox.mask属性的设计时弹出窗体

该对话框在system.design.dll中定义,名为“maskdesignerdialog”。它是内部的,所以不能直接使用。反射可以绕过这一点。用一个示例表单来尝试,在表单上放置一个按钮和一个maskedtextbox。使窗体的代码如下所示:

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsFormsApplication1 {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e) {
            Assembly asm = Assembly.Load("System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a");
            Type editor = asm.GetType("System.Windows.Forms.Design.MaskDesignerDialog");
            ConstructorInfo ci = editor.GetConstructor(new Type[] { typeof(MaskedTextBox), typeof(System.ComponentModel.Design.IHelpService) });
            Form dlg = ci.Invoke(new object[] { maskedTextBox1, null }) as Form;
            if (DialogResult.OK == dlg.ShowDialog(this)) {
                PropertyInfo pi = editor.GetProperty("Mask");
                maskedTextBox1.Mask = pi.GetValue(dlg, null) as string;
            }
        }
    }
}