Entity Framework 6 set connection string runtime

Question

We are in a mixed environment where our application is using both ADO.NET and Entity Framework.
Since both are pointing to the same physical SQL server, we would like to

Answer 1

You can work at design time using the connection string in your config file.

So don't remove it because you need it ONLY at design time.

Work instead in a dynamic way at runtime using this approach (similar to your last one):

Extend the data context partial class:

public partial class DWContext
{
    public DWContext(string nameOrConnectionString)
        : base(nameOrConnectionString)
    {
    }

    /// 

    /// Create a new EF6 dynamic data context using the specified provider connection string.
    /// 
    /// Provider connection string to use. Usually a standart ADO.NET connection string.
    /// 
    public static DWContext Create(string providerConnectionString)
    {
        var entityBuilder = new EntityConnectionStringBuilder();

        // use your ADO.NET connection string
        entityBuilder.ProviderConnectionString = providerConnectionString;

        entityBuilder.Provider = "System.Data.SqlClient";

        // Set the Metadata location.
        entityBuilder.Metadata = @"res://*/Database.DWH.DWModel.csdl|res://*/Database.DWH.DWModel.ssdl|res://*/Database.DWH.DWModel.msl";

        return new DWContext(entityBuilder.ConnectionString);
    }

}

And from your code create a new EF data context with:

private DWContext db = DWContext.Create(providerConnectionString);

Ciao ;-)