CODEWITHSUNDEEP
c#entity-frameworkreflectioncasting
JHixson
JHixson

Reputation: 1522

How to unpackage a DbSet<T> stored as an object without knowing its subtype at compile time?

I have a DbSet<T>, where T is unknown at compile time, that is given to me from Reflection. I would like to unpack it and work with the methods available to me in the non-generic DbSet Class. However:

((DbSet)MyDbSetAsObject).Attach(MyValue); //InvalidCastException, can't cast from DbSet<T>to DbSet.

Am I missing something here? this seems like a personally reasonable thing to do

Upvotes: 0

Views: 201

Answers (2)

haim770
haim770

Reputation: 49095

The generic DbSet<> contains an implicit conversion to the non-generic DbSet:

// Summary:
//     Returns the equivalent non-generic System.Data.Entity.DbSet object.
//
// Returns:
//     The non-generic set object.
[SuppressMessage("Microsoft.Usage", "CA2225:OperatorOverloadsHaveNamedAlternates", Justification = "Intentionally just implicit to reduce API clutter.")]
public static implicit operator DbSet(DbSet<TEntity> entry);

That means you can simply write:

DbSet nonGenericSet = myGenericSet;

You could also try (as already proposed by @Lorentz Vedeler):

DbSet nonGenericSet = this.Set(typeof(myRunTimeEntity));

Upvotes: 1

Lorentz Vedeler
Lorentz Vedeler

Reputation: 5301

Use this Method to retrieve a set for the given type.

var dbSet = MyContext.Set(MyType);
dbSet.Attach(MyValue);

Upvotes: 2

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