C#高级-ErrorProvider控件-验证文本框输入

1.控件

lable控件、textBox控件、button控件、errorProvider控件

2.示例：

3.代码

• 事件1

        private void txtName_TextChanged(object sender, EventArgs e)
        {
            if (txtName.Text.Length < 5 || txtName.Text.Length > 8)
            {
                epName.SetError(txtName, "用户名必须为5-8位");
                epName.Icon = new Icon(Application.StartupPath + @"\wrong.ico");
            }
            else
            {
                epName.SetError(txtName, "验证通过");
                epName.Icon = new Icon(Application.StartupPath + @"\right.ico");
            }
        }

• 事件2

       private void txtPass_Validating(object sender, System.ComponentModel.Cance