sharepoint 2013 Form认证 注销用户凭证

在网上找到一个关于sharepoint 2013 Form表单认证的sign out 方法，经过验证，有效。方法如下：

private void
RemoveCookiesAndSignOut()
        {
            // Clear sessionstate.

            if (Context.Session !=null)
            {
               
Context.Session.Clear();
            }
            string cookieValue =
string.Empty;
            if(Context.Request.Browser["supportsEmptyStringInCookieValue"]
== "false")
               
cookieValue = "NoCookie";
            // Clear my owncookie.
            HttpCookie cookieWinSignIn =Context.Request.Cookies["Morpheus_WindowsSignedIn"];
            if (cookieWinSignIn !=
null)
            {
               
cookieWinSignIn.Value =cookieValue;
               Context.Response.Cookies.Remove("Morpheus_WindowsSignedIn");
               Context.Response.Cookies.Add(cookieWinSignIn);
            }
            // Remove cookiesfor authentication.

            HttpCookie cookieSession =Context.Request.Cookies["WSS_KeepSessionAuthenticated"];
            if (cookieSession !=
null)
            {
               
cookieSession.Value =cookieValue;
                Context.Response.Cookies.Remove("WSS_KeepSessionAuthenticated");
               Context.Response.Cookies.Add(cookieSession);
            }
 
            HttpCookie cookiePersist =Context.Request.Cookies["MSOWebPartPage_AnonymousAccessCookie"];
            if (cookiePersist !=
null)
            {
               
cookiePersist.Value =cookieValue;
               
cookiePersist.Expires = newDateTime(1970, 1, 1);
               Context.Response.Cookies.Remove("MSOWebPartPage_AnonymousAccessCookie");
               Context.Response.Cookies.Add(cookiePersist);
            }
            // Sign out.
            Microsoft.IdentityModel.Web.FederatedAuthentication.SessionAuthenticationModule.SignOut();
        }

需要引用以下dll：

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Microsoft.SharePoint.IdentityModel\v4.0_15.0.0.0__71e9bce111e9429c\Microsoft.SharePoint.IdentityModel.dll

C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.IdentityModel.dll

C:\Program Files\Reference Assemblies\Microsoft\Windows Identity Foundation\v3.5\Microsoft.IdentityModel.dll

页面继承IdentityModelSignInPageBase类。