IPostBackDataHandler.LoadPostData(String, NameValueCollection) 方法

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

当由某个类实现时，它为 ASP.NET 服务器控件处理回发数据。

public:
 bool LoadPostData(System::String ^ postDataKey, System::Collections::Specialized::NameValueCollection ^ postCollection);

public bool LoadPostData (string postDataKey, System.Collections.Specialized.NameValueCollection postCollection);

abstract member LoadPostData : string * System.Collections.Specialized.NameValueCollection -> bool

Public Function LoadPostData (postDataKey As String, postCollection As NameValueCollection) As Boolean

参数

postDataKey

String

控件的主要标识符。

postCollection

NameValueCollection

所有传入名称值的集合。

返回

Boolean

如果回发导致服务器控件的状态发生更改，则为 true；否则为 false。

示例

下面的代码示例演示了实现 方法版本的 LoadPostData 服务器控件。

public virtual bool LoadPostData(string postDataKey,
   NameValueCollection postCollection) {

   String presentValue = Text;
   String postedValue = postCollection[postDataKey];

   if (presentValue == null || !presentValue.Equals(postedValue)){
      Text = postedValue;
      return true;
   }
   return false;
}

Public Overridable Function LoadPostData(postDataKey As String, _
   postCollection As NameValueCollection) As Boolean
       
    Dim presentValue As String = Text
    Dim postedValue As String = postCollection(postDataKey)
       
    If (presentValue Is Nothing) OrElse (Not presentValue.Equals(postedValue)) Then 
        Text = postedValue
        Return True
    End If
    Return False
End Function

注解

ASP.NET 页框架跟踪返回 true 此方法调用的所有服务器控件，然后对这些控件调用 RaisePostDataChangedEvent 方法。

另请参阅

• ASP.NET 网页中的服务器事件处理