sharepoint 判断用户是否存在某个组中三种方法

  public static bool IsUserMemberOfGroup(SPUser user, string groupName)
        {
            bool result = false;

            if (!String.IsNullOrEmpty(groupName) && user != null)
            {
                foreach (SPGroup group in user.Groups)
                {
                    if (group.Name == groupName)
                    {
                        // found it
                        result = true;
                        break;
                    }
                }
            }

            return result;
        }

 public bool IsExitUser(SPWeb web, string loginname, string groupname)
        {
            try
            {
                foreach (SPUser userlist in web.SiteGroups[groupname].Users)
                {
                    if (userlist.LoginName.ToString().ToLower() == loginname.ToLower())
                        return true;
                }
                return false;
            }
            catch (Exception)
            {
                throw;
                
            }

        }

 function IsGroupMember(groupname) 
     {
           //Checks user group membership to see if the current user is a member of "groupname"
              var booGroup = new Boolean(false);
              $().SPServices({
                   operation: "GetGroupCollectionFromUser",
                   userLoginName: thisUserAccount,
                   async: false,
                   webURL: "weburl",
                   completefunc: function(xData, Status) {
                       if ($(xData.responseXML).find("Group[Name=‘" + groupname + "‘]").length == 1) {
                           booGroup = true;
                        }
                   }
                  });
               return booGroup;
      }
      
      var thisUserAccount = $().SPServices.SPGetCurrentUser({
    fieldName: "Name",
    debug: false
       });

if(IsGroupMember("用户组名称")==true)
           
{
   //您的代码
}

if(IsGroupMember("用户组名称"))
           
{
 //您的代码
}