RequiredAttribute 构造函数

定义

命名空间:

System.ComponentModel.DataAnnotations

程序集:

System.ComponentModel.Annotations.dll

Source:

RequiredAttribute.cs

初始化 RequiredAttribute 类的新实例。

public:
 RequiredAttribute();

public RequiredAttribute ();

Public Sub New ()

示例

下面的示例演示如何使用 RequiredAttribute 构造函数。 如果验证失败，该示例将显示动态数据提供的验证错误消息。

// Require that the MiddleName is not null.
// Use standard validation error.
[Required()]
public object MiddleName;

' Require that the MiddleName is not null.
' Use standard validation error.
<Required()> _
Public MiddleName As Object