Mapping complex stored procedure with code first approach - entity-framework

Question

Is it possible with Entity Framework code-first approach to map already created stored procedures?
For example I have a complex stored procedure and I want to map it with code first approach.
I will run the script for creating stored procedure using migration so the procedure will always available but how to map it with code first approach?

Answer 1

AFAIK, there's no built-in support to map the stored procedure in code-first. You have to manually call the procedure though you can map the results of the procedure using ObjectContext's Translate method.
E.g.
using (var db = new BloggingContext())
{
// If using Code First we need to make sure the model is built before we open the connection
// This isn't required for models created with the EF Designer
db.Database.Initialize(force: false);
// Create a SQL command to execute the sproc
var cmd = db.Database.Connection.CreateCommand();
cmd.CommandText = "[dbo].[GetAllBlogsAndPosts]";
try
{
db.Database.Connection.Open();
// Run the sproc
var reader = cmd.ExecuteReader();
// Read Blogs from the first result set
var blogs = ((IObjectContextAdapter)db)
.ObjectContext
.Translate<Blog>(reader, "Blogs", MergeOption.AppendOnly);
foreach (var item in blogs)
{
Console.WriteLine(item.Name);
}
// Move to second result set and read Posts
reader.NextResult();
var posts = ((IObjectContextAdapter)db)
.ObjectContext
.Translate<Post>(reader, "Posts", MergeOption.AppendOnly);
foreach (var item in posts)
{
Console.WriteLine(item.Title);
}
}
finally
{
db.Database.Connection.Close();
}
}
You can also map the stored procedure that returns more complex type, if you're using an .EDMX file. See this MSDN article for more details.
Note: you can add T4 template to add the custom mapping to add the custom stored procedure mapping every time the .EDMX is generated.