sharepoint默认是没有修改AD密码 和切换 用户的功能，这里我用future的方式来实现。
部署wsp前：
部署后：
点击以其他用户身份登录
点击修改用户密码：
这里的扩展才菜单我们用CustomAction来实现，我们需要添加空项目来部署它
以其他用户身份登录得xml如下：
修改用户密码的xml如下：
这里我们需要新建一个应用程序页面，首先需要添加路径映射：
添加应用程序页面的代码如下：
<%@ Assembly Name="$SharePoint.Project.AssemblyFullName___FCKpd___0quot; %><%@ Import Namespace="Microsoft.SharePoint.ApplicationPages" %><%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %><%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %><%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %><%@ Import Namespace="Microsoft.SharePoint" %><%@ Assembly Name="Microsoft.Web.CommandUI, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %><%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ChangePassword.aspx.cs" Inherits="SharePointProjectDemo.Layouts.ChangePassword.ChangePassword" DynamicMasterPageFile="~masterurl/default.master" %><asp:Content ID="PageHead" ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server"></asp:Content><asp:Content ID="Main" ContentPlaceHolderID="PlaceHolderMain" runat="server"> <asp:Literal ID="ltMsg" EnableViewState="false" runat="server"></asp:Literal><div> <h3> <span>修改密码</span> </h3> <table width="400px"> <tr> <td> 域 </td> <td> : </td> <td> <asp:TextBox ID="txtdomain" runat="server" ></asp:TextBox> </td> </tr> <tr> <td> 旧密码 </td> <td> : </td> <td> <asp:TextBox ID="txtOld" runat="server" TextMode="Password"></asp:TextBox> </td> </tr> <tr> <td> 新密码 </td> <td> : </td> <td> <asp:TextBox ID="txtPass1" runat="server" TextMode="Password"></asp:TextBox> </td> </tr> <tr> <td> 确认新密码 </td> <td> : </td> <td> <asp:TextBox ID="txtPass2" runat="server" TextMode="Password"></asp:TextBox> </td> </tr> <tr> <td colspan="3" align="center"> <br /> <asp:Button ID="btnChangePwd" runat="server" Text="修改密码" OnClick="btnChangePwd_Click" /> </td> </tr> </table> <br /> <br /></div></asp:Content><asp:Content ID="PageTitle" ContentPlaceHolderID="PlaceHolderPageTitle" runat="server">修改密码</asp:Content><asp:Content ID="PageTitleInTitleArea" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea" runat="server" >修改密码</asp:Content>
using System;using Microsoft.SharePoint;using Microsoft.SharePoint.WebControls;using System.Security.Principal;using System.DirectoryServices.AccountManagement;namespace SharePointProjectDemo.Layouts.ChangePassword
{ public class Impersonator
{ // Fields
private WindowsImpersonationContext ctx = null; // Methods
public void BeginImpersonation()
{ try
{ if (!WindowsIdentity.GetCurrent().IsSystem)
{ this.ctx = WindowsIdentity.Impersonate(WindowsIdentity.GetCurrent().Token); this.IsImpersonated = true;
}
} catch
{ this.IsImpersonated = false;
}
} public void StopImpersonation()
{ if (this.ctx != null)
{ this.ctx.Undo();
}
} // Properties
public bool IsImpersonated
{ set; get;
}
} public partial class ChangePassword : LayoutsPageBase
{ protected void btnChangePwd_Click(object sender, EventArgs e)
{ string str = this.txtPass1.Text.Trim(); string str2 = this.txtPass2.Text.Trim(); string str3 = this.txtOld.Text.Trim(); string str4 = this.txtdomain.Text.Trim(); if (string.IsNullOrWhiteSpace(str4))
{ this.ltMsg.Text = "域不能为空！";
} else if (string.IsNullOrWhiteSpace(str3))
{ this.ltMsg.Text = "旧密码不能为空！";
} else if (string.IsNullOrWhiteSpace(str))
{ this.ltMsg.Text = "新密码不能为空！";
} else if (str == str2)
{ this.ChangeUserPassword(this.txtPass2.Text.Trim(), str3, str4);
} else
{ this.ltMsg.Text = "两次新密码不一致，请检查！";
}
} private void ChangeUserPassword(string NewPwd, string OldPwd, string domain)
{ try
{
Impersonator impersonator = new Impersonator();
impersonator.BeginImpersonation(); using (PrincipalContext context = this.GetPContext(OldPwd, domain))
{ using (UserPrincipal principal = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, GetLoginName()))
{
principal.ChangePassword(OldPwd, NewPwd);
}
} if (impersonator.IsImpersonated)
{
impersonator.StopImpersonation(); this.ltMsg.Text = "已成功修改密码！";
} else
{ this.ltMsg.Text = "无法修改您的密码，请联系您的系统管理员！";
}
} catch (Exception exception)
{ this.ltMsg.Text = exception.Message;
}
} private string GetDomainContainter(string domain)
{ string str = string.Empty; string[] strArray = domain.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries); foreach (string str2 in strArray)
{
str = str + "DC=" + str2 + ",";
} if (str.Length > 0)
{
str = str.Substring(0, str.Length - 1);
} return str;
} private string GetLoginName()
{ string username= SPContext.Current.Web.CurrentUser.LoginName.Replace("i:0#.w|", ""); if(username.EndsWith(@"\system"))
{
username = username.Replace("system", "sherry");
} return username;
} private string GetLoginNameDomain()
{ string[] strArray = GetLoginName().Split(new char[] { '\\' }, StringSplitOptions.RemoveEmptyEntries); if (strArray.Length == 2)
{ return strArray[0];
} return null;
} private PrincipalContext GetPContext(string OldPwd, string domain)
{ return new PrincipalContext(ContextType.Domain, domain, this.GetDomainContainter(domain), ContextOptions.Negotiate, this.GetLoginName(), OldPwd);
} protected void Page_Load(object sender, EventArgs e)
{ this.ltMsg.Text = GetLoginName().Replace("i:0#.w|", "");
}
}
} 
