The 'Id' property on 'Table1' could not be set to a 'System.Byte[]' value. You must set this property to a non-null value of type 'System.Guid'

Question

I am using Code First with Oracle 12c . I have a class

public class Table1
{
  public Guid Id { get; set; }
  public string SomeOtherStuff { get; set; }
} 

Entity Framework converts Id to RAW

CREATE TABLE "FB"."Media" 
   (    "Id" RAW(16) NOT NULL ENABLE, ...

So now if I do this:

var list = db.Table1.SqlQuery("select * from Table1")).ToList();

I get an error

The 'Id' property on 'Table1' could not be set to a 'System.Byte[]' value. You must set this property to a non-null value of type 'System.Guid'}`

Edit: I am using Oracle.ManagedDataAccess.EntityFramework 6.121.2.0

Answer 1

The problem is that your Oracle EF provider maps Guid to the Raw type, but in turn, the Raw is mapped to a byte array.

You could try specifying the column type yourself, if your provider supports it (depending on your provider, it might not).

public class Table1
{

  [Column("Id", TypeName="VARCHAR(50)")]
  public Guid Id { get; set; }
  public string SomeOtherStuff { get; set; }
}