TemplateInstanceAttribute.IsDefaultAttribute 方法

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

返回一个值，该值指示当前 TemplateInstanceAttribute 对象是否与默认 TemplateInstanceAttribute 对象相同。

public:
 override bool IsDefaultAttribute();

public override bool IsDefaultAttribute ();

override this.IsDefaultAttribute : unit -> bool

Public Overrides Function IsDefaultAttribute () As Boolean

返回

Boolean

如果 TemplateInstanceAttribute 的当前实例为默认值，则为 true；否则为 false。

示例

下面的代码示例演示如何使用 IsDefaultAttribute 方法。 在 Page_Load ASPX 页中， MyLoginViewA 将查询属性的 TemplateInstanceAttribute 自定义控件的 类 AnonymousTemplate 。

有关控件的定义 MyLoginViewA ，请参阅 TemplateInstanceAttribute。

protected void Page_Load(object sender, EventArgs e)
{
      
  // Get the class type for which to access metadata.
  Type clsType = typeof(MyLoginViewA);
  // Get the PropertyInfo object for FirstTemplate.
  PropertyInfo pInfo = clsType.GetProperty("AnonymousTemplate");
  // See if the TemplateInstanceAttribute is defined for this property.
  bool isDef = Attribute.IsDefined(pInfo, typeof(TemplateInstanceAttribute));

  // Display the result if the attribute exists.
  if (isDef)
  {
    TemplateInstanceAttribute tia =
      (TemplateInstanceAttribute)Attribute.GetCustomAttribute(pInfo, typeof(TemplateInstanceAttribute));
    Response.Write("The <AnonymousTemplate> has the TemplateInstanceAttribute = " + tia.Instances.ToString() + ".<br />");
    if (tia.IsDefaultAttribute())
      Response.Write("The TemplateInstanceAttribute used is the same as the default instance.");
    else
      Response.Write("The TemplateInstanceAttribute used is not the same as the default instance.");
  }

}

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
  
  ' Get the class type for which to access metadata.
  Dim clsType As Type = GetType(MyLoginViewA)
  ' Get the PropertyInfo object for FirstTemplate.
  Dim pInfo As PropertyInfo = clsType.GetProperty("AnonymousTemplate")
  ' See if the TemplateInstanceAttribute is defined for this property.
  Dim isDef As Boolean = Attribute.IsDefined(pInfo, GetType(TemplateContainerAttribute))
  
  ' Display the result if the attribute exists.
  If isDef Then
    Dim tia As TemplateInstanceAttribute = CType(Attribute.GetCustomAttribute(pInfo, GetType(TemplateInstanceAttribute)), TemplateInstanceAttribute)
    Response.Write("The <AnonymousTemplate> has the TemplateInstanceAttribute = " & tia.Instances.ToString() & ".<br />")
    If (tia.IsDefaultAttribute()) Then
      Response.Write("The TemplateInstanceAttribute used is the same as the default instance.")
    Else
      Response.Write("The TemplateInstanceAttribute used is not the same as the default instance.")
    End If

  End If

End Sub

注解

类的 TemplateInstanceAttribute 默认值为 Multiple 字段。

另请参阅

• Equals(Object)
• Multiple