System.InvalidOperationException : Unable to determine composite primary key ordering for type Name. Use the ColumnAttribute or the HasKey method to specify an order for composite primary keys

Possibly save 1 hour of your time: You may encounter this error if you have multiple keys but didn’t define the column order.

public partial class YourEntityName
[Column(Order = 1)]
public int Year { get; set; }

[Column(Order = 2)]
public string CountryCode { get; set; }

public double Value { get; set; }



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s