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C# TextBox事件是我们在开发中会碰到的具体的功能需求,那么如何使得想要的C# TextBox事件执行呢?那么这里就向你介绍具体的C# TextBox事件演示实例,包括需求的实现,希望对你有所帮助。

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C# TextBox事件具体的需求:
◆界面要求:定义5个TEXTBOX,分别是:姓名、地址、职业、年龄、输出内容。1个BUTTON
◆满足条件:
(1)用户名不能为空
(2)年龄必须是一个大于或等于0的数字
(3)职业必须是“程序员”或为空
(4)地址不能为空
C# TextBox事件实例实现:
- using System;
 - using System.Collections.Generic;
 - using System.ComponentModel;
 - using System.Data;
 - using System.Drawing;
 - using System.Text;
 - using System.Windows.Forms;
 - namespace Chapter14
 - ...{
 - public partial class Form1 : Form
 - ...{
 - public Form1()
 - ...{
 - InitializeComponent();
 - this.button1.Enabled = false;
 - this.textBox1.Tag = false;
 - this.textBox2.Tag = false;
 - this.textBox3.Tag = false;
 - this.textBox4.Tag = false;
 - this.textBox1.Validating+=
 - new System.ComponentModel.CancelEventHandler(
 - this.textboxEmpty_Validating);
 - this.textBox2.Validating +=
 - new System.ComponentModel.CancelEventHandler(
 - this.textboxEmpty_Validating);
 - this.textBox3.Validating+=
 - new System.ComponentModel.CancelEventHandler(
 - this.textboxOccupation_Validating);
 - this.textBox4.Validating +=
 - new System.ComponentModel.CancelEventHandler(
 - this.textboxEmpty_Validating);
 - this.textBox1.TextChanged +=
 - new System.EventHandler(this.textbox_TextChanged);
 - this.textBox4.TextChanged +=
 - new System.EventHandler(this.textbox_TextChanged);
 - this.textBox3.TextChanged +=
 - new System.EventHandler(this.textbox_TextChanged);
 - }
 - //C# TextBox事件
 - 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();
 - }
 - //C# TextBox事件
 - 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 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!=textBox3)
 - ...{
 - tb.Tag = false;
 - tb.BackColor = Color.Red;
 - }
 - else if (tb == this.textBox3 &&
 - (tb.Text.Length != 0 &&
 - tb.Text.CompareTo("Programmer") != 0))
 - ...{
 - tb.Tag = false;
 - }
 - //C# TextBox事件
 - else
 - ...{
 - tb.Tag = true;
 - tb.BackColor = SystemColors.Window;
 - }
 - ValidateOk();
 - }
 - private void ValidateOk()
 - ...{
 - this.button1.Enabled =
 - ((bool)(this.textBox2.Tag) &&
 - (bool)(this.textBox4.Tag) &&
 - (bool)(this.textBox1.Tag) &&
 - (bool)(this.textBox3.Tag));
 - }
 - private void button1_Click(
 - object sender, EventArgs e)
 - ...{
 - string output;
 - //C# TextBox事件
 - output = "Name:" + this.textBox1.Text + " ";
 - output += "Address:" + this.textBox2.Text + " ";
 - output += "Occupation:" + this.textBox3.Text + " ";
 - output += "Age:" + this.textBox4.Text + " ";
 - this.textBox5.Text = output;
 - }
 - }
 - }
 
C# TextBox事件实现的具体实例就向你介绍到这里,希望对你了解和学习C# TextBox事件有所帮助。
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