SQL to LINQ to SQL 表达式没有加入

Question

在实体框架中使用导航将 SQL 查询转换为下面的查询时

SELECT DISTINCT 

a.ApplicationID, eA.EmployeeID AS AppID, eA.EmailID AS AppEmail, 
eA.Title + eA.Name AS Applicant, eR.EmployeeID, eR.Title + eR.Name 
AS Employee, eR.EmailID AS Email, r.Title AS Role, r.RoleID, t .Title AS 
Task, t .TaskID, d .ShortName AS AppDeptSN, a.Reminders, '' AS SubTaskID
FROM 
dbo.Application_TaskLog AS a INNER JOIN
dbo.Task AS t ON t .TaskID = a.TaskID INNER JOIN
dbo.Role AS r ON r.RoleID = t .RoleID INNER JOIN
dbo.Application_Role AS ar ON ar.ApplicationID = a.ApplicationID AND 
ar.RoleID = t .RoleID INNER JOIN
dbo.Employee AS eR ON eR.EmployeeID = ar.EmployeeID INNER JOIN
dbo.Application AS app ON app.ApplicationID = a.ApplicationID INNER JOIN
dbo.Employee AS eA ON eA.EmployeeID = app.EmployeeID LEFT OUTER JOIN
dbo.Departments AS d ON eA.DepartmentID = d .DepartmentID

我写了下面的函数来填充gridview

public List<Application_TaskLog> GetAppTaskLogDistinct(int appID)
{
    var context = new FPSDB_newEntities();
    var data = (from atl in context.Application_TaskLog
                where atl.ApplicationID == appID
                && !atl.Application.ApplicationClosed && !atl.Completed
                select atl).Distinct().ToList();
    return data;
}

Distinct() 在 SQL 中无法正常工作。我很困惑如何使用我在 SQL 中使用的 Distinct

Answer 1

context.Application_TaskLog 已经返回不同的 Application_TaskLog 记录，并且查询中没有任何重复它们的内容，因此 Distinct() 没有任何区别