using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Ch14TextBoxTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

this.buttonOK.Enabled = false;
this.textBoxAddress.Tag = false;
this.textBoxAge.Tag = false;
this.textBoxName.Tag = false;
this.textBoxOccupation.Tag = false;

this.textBoxName.Validating += new
System.ComponentModel.CancelEventHandler(this.textBoxEmpty_Validating); //委托能够赋值给属性?这句话究竟是什么意思?
this.textBoxAddress.Validating += new
System.ComponentModel.CancelEventHandler(this.textBoxEmpty_Validating);

this.textBoxOccupation.Validating+=new
System.ComponentModel.CancelEventHandler(this.textBoxOccupation_Validating);

this.textBoxAge.Validating+=new
System.ComponentModel.CancelEventHandler(this.textBoxEmpty_Validating);

this.textBoxName.TextChanged += new
System.EventHandler(this.textBox_TextChanged);
this.textBoxAddress.TextChanged+=new
System.EventHandler(this.textBox_TextChanged);
this.textBoxAge.TextChanged+=new
System.EventHandler(this.textBox_TextChanged);
this.textBoxOccupation.TextChanged+=new
System.EventHandler(this.textBox_TextChanged);

}

private void button1_Click(object sender, EventArgs e)
{
string output;

output = "Name: " + this.textBoxName.Text + "\r\n";
output += "Address: " + this.textBoxAddress.Text + "\r\n";
output += "Occupation: " + this.textBoxOccupation.Text + "\r\n";
output += "Age: " + this.textBoxAge.Text + "\r\n";

this.textBoxOutput.Text = output;
}

private void button2_Click(object sender, EventArgs e)
{
string output;

output = "Name=Your name\r\n";
output += "Address=Your address\r\n";
output += "Occupation=Only allowed value is 'Programmer'\r\n";

this.textBoxOutput.Text = output;
}

private void textBoxEmpty_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
TextBox tb = (TextBox)sender;

if (tb.Text.Length == 0)
{
tb.BackColor = Color.Red;
tb.Tag = false;
}

else
{
tb.BackColor = System.Drawing.SystemColors.Window;
tb.Tag = true;
}

ValidateOK();

}

private void textBoxOccupation_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
TextBox tb = (TextBox)sender;

if (tb.Text.CompareTo("Programmer") == 0 || tb.Text.Length == 0)
{
tb.Tag = true;
tb.BackColor = System.Drawing.SystemColors.Window;
}

else
{
tb.Tag = false;
tb.BackColor = Color.Red;
}

ValidateOK();
}

private void textBoxAge_KeyPress(object sender, KeyPressEventArgs e)
{
if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8)
e.Handled = true;
}

private void textBox_TextChanged(object sender, System.EventArgs e)
{
TextBox tb = (TextBox)sender;

if (tb.Text.Length == 0 && tb != textBoxOccupation)
{
tb.Tag = false;
tb.BackColor = Color.Red;
}

else if (tb == textBoxOccupation && (tb.Text.Length != 0 && tb.Text.CompareTo("Programmer") != 0))
{
tb.Tag = false;
}

else
{
tb.Tag = true;
tb.BackColor = SystemColors.Window;
}

ValidateOK();
}

private void ValidateOK()
{
this.buttonOK.Enabled=((bool)(this.textBoxAddress.Tag)&&
(bool)(this.textBoxAge.Tag)&&
(bool)(this.textBoxName.Tag)&&
(bool)(this.textBoxOccupation.Tag));
}

private void Form1_Load(object sender, EventArgs e)
{

}

}
}

this.textBoxName.Validating += new
System.ComponentModel.CancelEventHandler(this.textBoxEmpty_Validating);


委托。
textBoxName.Validating 的方法和textBox.Empty_Validating的一样。

那这句话该怎样来理解呢?

左边是事件..右边是委托..不太懂了

关于这个程序我也有个问题,就是在运行以上程序时候出现错误:
Form1.Designer.cs

namespace WindowsApplication8
{
partial class Form1
{
private System.ComponentModel.IContainer components = null;

/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing) //错误提示为:WindowsAppliction.Form1.Dispose(bool):没有找到合适的方法重写
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region Windows 窗体设计器生成的代码

private void InitializeComponent()
{
this.SuspendLayout();

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}

#endregion
}
}
哪位大大帮忙看看是怎么回事,我装的是VS2005 ,好象是实验版..是不是这方面出的问题`?

[此贴子已经被作者于2006-11-7 2:25:02编辑过]

protected override void Dispose(bool disposing)
{
if (disposing)
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose(disposing);
}
你看看program里面有没有这个函数？

自动生成的时候应该是没有这个函数的

JINGZHAO同学..能不能回答我在上面所提的问题呢?

触电: 把textBoxEmpty_Validating委託到事件中


joerson: 你根本沒有父類 何來的override

thanks....