如何授予对SharePoint中SPListItem的访问权限

以下代码用于授予用户访问SPListItem的权限

Following code is use to give permission to user to access SPListItem

//Add current user
 tempRoleAssignment = new SPRoleAssignment((SPPrincipal)currentUser);
                         tempRoleAssignment.RoleDefinitionBindings.Add(web.RoleDefinitions.GetByType(SPRoleType.Contributor));
item.RoleAssignments.Add(tempRoleAssignment);

但是，当当前用户域服务器与共享点服务器不同时，它将不起作用.

更多信息
我的Sharepoint服务器名称是spserver.域名服务器名称为domainserver.当我尝试将domainserver的用户权限授予共享点服务器SPListItem时，它无法分配，因为我可以将权限授予任何共享点组.使用上面的代码不会引发任何错误/异常，但用户无权访问该特定的SPListItem.

我想知道是否有人可以帮助我?

感谢

but it is not work when current user domain server is different than the sharepoint server.

More information
My Sharepoint server name is spserver. Domain server name is domainserver. When I try to give right to user of domainserver to sharepoint server SPListItem it cannot assign as I can able give right to any sharepoint group. It does not fire any error/exception by using above code but user cannot have right to access that perticular SPListItem.

I wonder if anyone can help me?

Thanks