WebPart.PartCacheInvalidate method (Storage, String)

標示為過期的網頁組件快取中指定的儲存體類型的指定快取項目。

Namespace:  Microsoft.SharePoint.WebPartPages
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

Syntax

'宣告
Protected Sub PartCacheInvalidate ( _
    storage As Storage, _
    key As String _
)
'用途
Dim storage As Storage
Dim key As String

Me.PartCacheInvalidate(storage, key)

protected void PartCacheInvalidate(
    Storage storage,
    string key
)

參數

• storage
  Type: Microsoft.SharePoint.WebPartPages.Storage

  會識別要標示為過期的網頁組件快取中配置的儲存體類型Storage值。可能值是Personal和Shared。

• key
  Type: System.String

  會識別快取項目網頁組件快取中指定的儲存體類型的值。

備註

呼叫PartCacheInvalidate(Storage, String)方法當做引數傳遞Storage值和機碼標示只指定快取的值為過期的網頁組件快取中指定之的儲存類型。呼叫**[M:Microsoft.SharePoint.WebPartPages.WebPart.PartCacheInvalidate()]**方法，將標記為過期的網頁組件快取的所有內容。呼叫PartCacheInvalidate(Storage)方法，將標記為過期的網頁組件快取中指定的儲存體類型的所有內容。

Examples

下列程式碼範例會顯示網頁組件快取，並顯示時先呈現，並提供按鈕來重新整理目前時間的網頁組件快取的時間。

Imports System
Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Xml.Serialization
Imports Microsoft.SharePoint
Imports Microsoft.SharePoint.Utilities
Imports Microsoft.SharePoint.WebPartPages

Namespace WebPartLibrary1
    <DefaultProperty("Text"), _
    ToolboxData("<{0}:CacheSample runat=server></{0}:CacheSample>"), _
    XmlRoot([Namespace] := "WebPartLibrary1")>
   Public Class CacheSample

      Inherits Microsoft.SharePoint.WebPartPages.WebPart
      Private refreshButton As Button

      Public Sub New()
         AddHandler Me.PreRender, AddressOf UpdateCache
      End Sub

      Protected Overrides Sub CreateChildControls()
         refreshButton = New Button()
         refreshButton.Text = "Refresh Cache"
         AddHandler refreshButton.Click, AddressOf refreshButton_click
         Me.Controls.Add(refreshButton)
      End Sub

      Public Sub UpdateCache(o As Object, e As System.EventArgs)

         If Me.PartCacheRead(Storage.Shared, "cacheKey") Is Nothing Then
            Me.PartCacheWrite(Storage.Shared, "cacheKey", fetchData(), TimeSpan.FromSeconds(10))
         End If
      End Sub

      Private Sub refreshButton_click(o As Object, e As System.EventArgs)
         Me.PartCacheInvalidate(Storage.Shared, "cacheKey")
      End Sub

      Protected Overrides Sub RenderWebPart(output As HtmlTextWriter)
         output.Write("Cache Value: ")
         output.Write((PartCacheRead(Storage.Shared, "cacheKey") + "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"))
         Me.RenderChildren(output)
      End Sub

      Private Function fetchData() As String
         Return DateTime.Now.ToLongTimeString()
      End Function
   End Class
End Namespace

using System;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.Serialization;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.WebPartPages;

namespace WebPartLibrary1
{
    /// <summary>
    /// Summary description for CacheSample.
    /// </summary>
    [DefaultProperty("Text"),
        ToolboxData("<{0}:CacheSample runat=server></{0}:CacheSample>"),
        XmlRoot(Namespace="WebPartLibrary1")]

    public class CacheSample : Microsoft.SharePoint.WebPartPages.WebPart
    {
        Button refreshButton;

        public CacheSample()
        {
            this.PreRender+=new EventHandler(UpdateCache);
        }

        protected override void CreateChildControls()
        {
            refreshButton = new Button();
            refreshButton.Text="Refresh Cache";
            refreshButton.Click+=new EventHandler(refreshButton_click);
            this.Controls.Add(refreshButton);
        }

        public void UpdateCache(object o, System.EventArgs e)
        {

            if(this.PartCacheRead(Storage.Shared,"cacheKey") == null)
            {
                this.PartCacheWrite(Storage.Shared,"cacheKey", fetchData(), TimeSpan.FromSeconds(10));
            }
        }

        private void refreshButton_click(object o, System.EventArgs e)
        {
            this.PartCacheInvalidate(Storage.Shared, "cacheKey");
        }

        protected override void RenderWebPart(HtmlTextWriter output)
        {
            output.Write("Cache Value: ");
            output.Write(PartCacheRead(Storage.Shared,"cacheKey")+ "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;");
            this.RenderChildren(output);
        }

        private string fetchData()
        {
            return DateTime.Now.ToLongTimeString();
        }
    }
}

請參閱

參照

WebPart class

WebPart members

PartCacheInvalidate overload

Microsoft.SharePoint.WebPartPages namespace