1)：假设我们有这样一个场景，我们为不同组的pages定义了不同的Layout，并且我们要在每个Layout中放置不同的可以修改Footer信息。

2)：这里的实现方式是创建一个List，然后在List中添加不同的Item，每个Item包含Layout中的Footer信息，然后在SharePoint 中用SafeControl的方式创建能够重复利用的Control。

如下为具体实现方式：

1)：创建Control，这里定义了一些参数，指定从哪个List中的哪个Item的哪个Field中获取信息

using System;using System.Collections.Generic;using System.ComponentModel;using System.Linq;using System.Text;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using Microsoft.SharePoint;namespace EricSunProject.WebParts.WebControls{    [DefaultProperty("ListName")]    [ToolboxData("<{0}:FnxDisclosureControl runat=server>
     ")]    public class FnxDisclosureControl : WebControl    {        /// 
        /// The name of the disclosure list        /// 
        [Bindable(true)]        public string ListName        {            get            {                String s = (String)ViewState["ListName"];                return ((s == null) ? String.Empty : s);            }            set            {                ViewState["ListName"] = value;            }        }        /// 
        /// The key field name to retrieve the disclosure text        /// 
        [Bindable(true)]        public string DisclosureField        {            get            {                String s = (String)ViewState["DisclosureField"];                return ((s == null) ? String.Empty : s);            }            set            {                ViewState["DisclosureField"] = value;            }        }        /// 
        /// The disclosure text field name        /// 
        [Bindable(true)]        public string DisclosureTextField        {            get            {                String s = (String)ViewState["DisclosureTextField"];                return ((s == null) ? String.Empty : s);            }            set            {                ViewState["DisclosureTextField"] = value;            }        }        /// 
        /// The unique disclosure key value        /// 
        [Bindable(true)]        public string DisclosureUniqueName        {            get            {                String s = (String)ViewState["DisclosureUniqueName"];                return ((s == null) ? String.Empty : s);            }            set            {                ViewState["DisclosureUniqueName"] = value;            }        }                protected override void CreateChildControls()        {            base.CreateChildControls();            if (!string.IsNullOrEmpty(this.DisclosureUniqueName) && !string.IsNullOrEmpty(this.ListName) &&                !string.IsNullOrEmpty(this.DisclosureField) && !string.IsNullOrEmpty(this.DisclosureTextField))            {                SPWeb rootWeb = SPContext.Current.Site.RootWeb;                if (rootWeb != null)                {                    SPList disclosureList = rootWeb.Lists[this.ListName];                    if (disclosureList != null)                    {                        SPQuery query = new SPQuery();                        query.Query = string.Format("
     
      
       
       
        {1}
       
      
     ", this.DisclosureField, this.DisclosureUniqueName);                        SPListItemCollection items = disclosureList.GetItems(query);                        if (items.Count > 0)                        {                            SPListItem contentItem = items[0]; // query should only return 1 item.                            string htmlContent = contentItem != null ? contentItem[this.DisclosureTextField] as string : string.Empty;                            this.Controls.Add(new Literal() { Text = htmlContent });                        }                    }                }            }        }    }}

 

2)：在package中声明此SafeControl

 

3)：在对应的Layout中注册此Control

<%@ Register Tagprefix="EricSunControls" Namespace="EricSunProject.WebParts.WebControls" Assembly="EricSunProject.WebParts, Version=1.0.0.0, Culture=neutral, PublicKeyToken=1de19275c7811c3b" %>

 

4)：应用此Control

 

这样就做到了这个Control可以重复利用，并且只需要改变参数，标识应用哪个List中的哪个Item中的哪个Field，去填充信息。当然了 SharePoint中的Item的值是可以随时修改的，这样后续只需要修改SharePoint中Item对应的Field值，那么我们自定义的Pages就可以随时显示修改后的Footer等信息。