在DevExpress xpo中加入Linq

Question

我在Devexpess中使用persistent类添加了两个datatable

 XPQuery<me_employee> EmployeeQuery = new XPQuery<me_employee>(XpoDefault.Session);
 XPQuery<mr_role> EmployeeRoleQuery = new XPQuery<mr_role>(XpoDefault.Session);
 var employees = from emp in EmployeeQuery join empRole in EmployeeRoleQuery on emp.me_role_pkey equals empRole.mr_pkey 
 select new { emp.me_pkey, empRole.mr_role_name };

它抛出一个错误，说明。

"Specified Method is not supported"

如何在Devexpress中加入linq

谢谢

Answer 1

下面这篇文章解释了如何在XPQuery中使用join：

How to create and use the JoinOperand using LINQ to XPO and Criteria Operators