使用实体框架检索逗号分隔的外键表数据

Question

I have a column which saves user id's as comma separated values

'32,12,64' 

What is best way of getting the related table data using Entity Framework if possible as [NotMapped] property in partial class of Task , since there is a trigger to maintain audit history moving user id's to child table is not possible. Please see sample code below

public class Task
{
    public int Id { get;set; }
    public string UserIds { get;set; }
    public string UserNames { get;set; }
}

var task = GetCurrentTask()

foreach(var userId in task.UserIds.Split(','))
{
   task.UserNames += GetUserNameFor(userId);
}

Answer 1

Here, UserIDs field is String so, you can query using LINQ if you have the value of this field.

var userIDs = "32,12,64";
var result = Usertable.retrieve(x=> x.UserID.Contains(userIDs)).ToList();

Try this way. You can find all the data from the User table with all fields value in results.