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C# TextBox事件实现实例详解 - C# - 编程开发 - 伊甸网

 昵称pds9i 2010-07-16

 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。

  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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