Calling Stored Procedures with Code First


One of the weaknesses of Entity Framework 6 Code First is the lack of support for natively calling database constructs (views, stored procedures… etc). For those who have not heard of or used Code-First in Entity Framework (EF), Code-First is simply a Fluent mapping API. The idea is to create all your database mappings in code (i.e. C#) and the framework then creates and track the changes in the database schema.

In traditional Entity Framework to call a stored procedure you’d map it in your EDMX file. This is a multi-step process. Once the process is completed a method is created, which hangs off the DataContext.

I sought to making a calling stored procedure easier. At the heart of a stored procedure you have a procedure name, N number of parameters and a results set. I’ve written a small extension method that takes a procedure name, parameters and a return type. It just works. No mapping the procedure and it’s parameters.

public static List<TReturn> CallStoredProcedure<TParameters, TReturn>(this DataContext context, string storedProcedure, TParameters parameters) where TParameters : class where TReturn : class, new()
IDictionary<string,object> procedureParameters = new Dictionary<string, object>();
PropertyInfo[] properties = parameters.GetType().GetProperties();

var ps = new List<object>();

foreach (var property in properties)
object value = property.GetValue(parameters);
string name = property.Name;

procedureParameters.Add(name, value);

ps.Add(new SqlParameter(name, value));

var keys = procedureParameters.Select(p => string.Format("@{0}", p.Key)).ToList();
var parms = string.Join(", ", keys.ToArray());

return context.Database.SqlQuery<TReturn>(storedProcedure + " " + parms, ps.ToArray()).ToList();


var context = new DataContext();

List<User> users = context.CallStoredProcedure<object,User>("User_GetUserById", new{userId = 3});

About the author

Chuck Conway

Add comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

By Chuck Conway


Chuck is an experienced software consultant creating technical solutions using ASP.Net Core, Angular 2+, React, the cloud (AWS and Azure), Docker, application architecture, agile (SCRUM, Lean), and performance tuning. Chuck lives in Folsom, California with his lovely wife Erin and their tabby, Mango.