var rolesAssignments = context.Web.RoleAssignments;
context.Load(rolesAssignments,roles => roles.IncludeWithDefaultProperties(role => role.Member,role => role.RoleDefinitionBindings));
context.ExecuteQuery();
var hasAdmin = rolesAssignments.Select(x => x.RoleDefinitionBindings.Cast<RoleDefinition>().Select(y => y.RoleTypeKind == RoleType.Administrator)).Any();

我得到：

{System.NotSupportedException: Invalid usage of query execution. The query should be executed by using ExecuteQuery method on the client context object.

但是,当我重写这个以使用嵌套foreach循环,它工作正常.

从我可以从我的LINQ查询看到,我不使用任何未加载的属性.