针对MVC中实例类型的修饰，我们可以采用DataAnnotations类来完成，该类所处的命名空间是System.ComponentModel.DataAnnotations;
一、通过开类型，能够修改Model类型的属性，如下代码所示：
public class Employee
{
[Key]
public int EmployeeId { get; set; } [Required(ErrorMessage = "Enter First Name"), StringLength()]
public string FirstName { get; set; } [StringLength(,ErrorMessage="Last Name length should be greater than 50")]
public string LastName { get; set; } public int Salary { get; set; }
}
备注：
1、[key]主键唯一，Required必填，ErrorMessage错误提示内容，StringLength表述字段长度。
Form表单代码：
<!DOCTYPE html> <html>
<head>
<meta name="viewport" content="width=device-width" />
<title>CreateEmployee</title>
</head>
<body>
<div>
<form action="/Employee/SaveEmployee" method="post">
<table>
<tr>
<td>First Name:</td>
<td><input type="text" id="TxtFName" name="FirstName" value="" /></td>
<td>@Html.ValidationMessage("FirstName")</td>
</tr>
<tr>
<td>Last Name:</td>
<td><input type="text" id="TxtLName" name="LastName" value="" /></td>
<td>@Html.ValidationMessage("LastName")</td>
</tr>
<tr>
<td>Salary:</td>
<td><input type="text" id="TxtSalary" name="Salary" value="" /></td>
<td>@Html.ValidationMessage("Salary")</td>
</tr>
<tr>
<td>
<input type="submit" name="BtnSave" value="Save Employee" />
<input type="submit" name="BtnSave" value="Cancel" />
</td>
</tr>
</table>
</form>
</div>
</body>
</html>
备注：@Html.ValidationMessage表述验收字段异常时，显示异常提示信息。
后台Action代码：
public ActionResult SaveEmployee(Employee et, string BtnSave)
{
switch (BtnSave)
{
case "Save Employee":
if (ModelState.IsValid)
{
EmployeeBusinessLayer empbal = new EmployeeBusinessLayer();
empbal.SaveEmployee(et);
return RedirectToAction("Index");
}
else
{
return View("CreateEmployee");
}
case "Cancel":
// RedirectToAction("index");
return RedirectToAction("Index");
}
return new EmptyResult();
}
备注：ModelState.IsValid表述Model字段验证是否有效
二、自定义服务端验证
1、新建自定义类：
public class FirstNameValidation : ValidationAttribute
{
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
if (value == null)
{
return new ValidationResult("Please Provide First Name");
}
else
{
if (value.ToString().Contains("@"))
{
return new ValidationResult("First Name should not contain @");
}
}
return ValidationResult.Success;
}
}
2、使用自定义验证类型
public class Employee
{
[Key]
public int EmployeeId { get; set; } [Required(ErrorMessage = "Enter First Name"), StringLength(), FirstNameValidation]
public string FirstName { get; set; } public int Salary { get; set; }
}