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.


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

[Key]
[Column(Order = 2)]
[StringLength(3)]
public string CountryCode { get; set; }

public double Value { get; set; }
}

 

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