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Implement LINQ to Entities unsupported method


Implement LINQ to Entities unsupported method

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Implement LINQ to Entities unsupported method
Tag : .net , By : Guid
Date : January 10 2021, 01:47 PM


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When using LINQ to Entities, is there a better method than casting to list in order to use unsupported code/extensions?


Tag : chash , By : user103892
Date : March 29 2020, 07:55 AM
I hope this helps you . I find myself needing to do things like this frequently, and I'm just curious if there is a better way. , You can use AsEnumerable():
_people = db.People.Where(...)
    .AsEnumerable()
    .Distinct(new MyCustomComparer())
    .ToList();
IEnumerable<Person> _people = db.People.Where(...);
_people = _people.Distinct(new MyCustomComparer()).ToList();

LINQ to Entities does not recognize the method 'Boolean Exists(System.Predicate`1[Entities.Connection])' method


Tag : chash , By : user112141
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The issue here is that Entity Framework does not understand your C# code and cannot parse .Exists().
An alternative way of writing this would be as followed:
_context.Notes
    .Include(t => t.Connections)
    .Where(t => t.CreatedUserId == userId || t.Connections.Any(c => c.UserId == userId));

LINQ Group by - linq to entities does not recognize the method 'char get_chars(int32) method


Tag : chash , By : Chris Hanley
Date : March 29 2020, 07:55 AM
With these it helps Entity Framework doesn't know how to translate the char indexer into valid SQL. Instead you can use string.Substring, for example:
var output = (from p in db.Products
              group p by p.ProductName.Substring(0, 1));

c# LINQ to Entities: unsupported type


Tag : chash , By : Tony Z
Date : March 29 2020, 07:55 AM

LINQ to Entities does not recognize the method 'Newtonsoft.Json.Linq.JToken get_Item(System.String)' method,


Tag : chash , By : eataix
Date : March 29 2020, 07:55 AM
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