C# 经典入门15章-TextBoxControl

第一步：设计界面如下：

第二步为其空间添加属性：因时间限制，附上截图

  }
        /// <summary>
        /// buttonOK的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            string output;
            output = "Name:" + this.textBoxName.Text + "\r\n";
            output += "Address:" + this.textBoxAddress.Text + "\r\n";
            output += "职业：" + this.textBoxOccupation.Text + "\r\n";
            output += "年龄：" + this.textBoxAge.Text + "\r\n";


            this.textBoxOutPut.Text = output;
        }

 /// <summary>
        /// buttonHelp的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

        private void button4_Click(object sender, EventArgs e)
        {
            string output;
            output = "Name=YourName\r\n";
            output += "Address=Your address\r\n";
            this.textBoxOutPut.Text = output;
        }

/// <summary>
        /// 文本框不能为空事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void textBox_Empty_Validating(object sender, CancelEventArgs e)
        {
            TextBox tb = (TextBox)sender;
            if (tb.Text.Length == 0)
                tb.BackColor = Color.Red;
            else
                tb.BackColor = System.Drawing.SystemColors.Window;
            ValidateOK();

        }

 /// <summary>
        /// 职业文本框的内容
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void textBoxOccupation_Validating(object sender, CancelEventArgs e)
        {
            TextBox tb = (TextBox)sender;
            if (tb.Text == "Programmer" || tb.Text.Length == 0)
                tb.BackColor = System.Drawing.SystemColors.Window;
            else
                tb.BackColor = Color.Red;
            ValidateOK(

 /// <summary>
        /// 控制年龄
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void textBoxAge_KeyPress(object sender, KeyPressEventArgs e)
        {//0-9之间数字的ASCII值是48-57  ASCII 8是退格键
            if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8)
                e.Handled = true;
        }

 /// <summary>
        /// 启用或禁用Ok按钮的ValidateOK方法
        /// </summary>
        private void ValidateOK()
        {
            button3.Enabled=(textBoxName.BackColor!=Color.Red&&
                textBoxAddress.BackColor!=Color.Red&&
                 textBoxOccupation.BackColor!=Color.Red&&
                  textBoxAge.BackColor!=Color.Red);

        }