System.NotSupportedException - 无法比较类型为“System.Linq.IQueryable”的元素 [英] System.NotSupportedException - Cannot compare elements of type 'System.Linq.IQueryable
问题描述
我正在收到以下错误
在EntityFramework.SqlServer.dll中发生了System.NotSupportedException类型的异常,但没有在用户代码中处理
An exception of type 'System.NotSupportedException' occurred in >EntityFramework.SqlServer.dll but was not handled in user code
附加信息:无法比较类型为'System.Linq.IQueryable`1的元素[[System.Int32,mscorlib,Version = 4.0.0.0 ,> Culture = neutral,PublicKeyToken = b77a5c561934e089]]'。只支持基本类型,枚举类型和实体类型。
Additional information: Cannot compare elements of type 'System.Linq.IQueryable`1[[System.Int32, mscorlib, Version=4.0.0.0, >Culture=neutral, PublicKeyToken=b77a5c561934e089]]'. Only primitive types, >enumeration types and entity types are supported.
我的代码是
public List<User> GetActiveUsers(IEnumerable<int> officeIDs, string roleID, string query)
{
return (from user in GetDBContext.User
join userRole in GetDBContext.UserRole
on user.UserID equals userRole.UserID
join userOffice in GetDBContext.UserAuthorizedOffice
on user.UserID equals userOffice.UserID
where user.IsActive == true &&
user.UserTypeID == 1 &&
userOffice.IsAuthorized &&
userOffice.Office.IsActive &&
(officeIDs == null || officeIDs.Contains(userOffice.OfficeID)) &&
string.Equals(userRole.RoleID, roleID) &&
(user.FirstName + user.LastName).Contains(query)
select user).ToList();
}
这个问题似乎从$
(officeIDs == null || officeIDs.Contains(userOffice.OfficeID))
如果我删除第一个条件, officeIDs == null
,查询执行完美。
If I remove the first condition, officeIDs == null
, the query executes perfectly.
任何人都可以解释我丢失的内容,或为什么会出现此错误。
Could anyone please explain what I am missing or as to why this error is thrown.
推荐答案
officeIDs == null
不能覆盖到 sql
语句
更改以下内容:
officeIDs == null
can't be coverted to a sql
statement
Change the below:
(officeIDs == null || officeIDs.Contains(userOffice.OfficeID))
首先检查您的功能顶部是否为空:
First check if it's null at top of your function:
officeIDs = officeIDs ?? Enumerable.Empty<int>;
替换该查询:
(!officeIDs.Any() || officeIDs.Any(id => id == userOffice.OfficeID))
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