Question

I’d like to get all the Foreign Key columns in a Table in my entity.
For example:

class User
{
    Id {get;set;}
    Name {get;set;}
    ColumnWithForeignKey1Id{get;set;}
    ColumnWithForeignKey2Id{get;set;}        
    ColumnWithForeignKey3Id{get;set;}
}

result should be like:

• ColumnWithForeignKey1Id
• ColumnWithForeignKey2Id
• ColumnWithForeignKey3Id

Answer 1

Here is a example, to gather the ForeignKeys defined with a special attribute; for this question “AssociationAttribute” and inside a given class, for this example “ClassName”.

Thanks for David B for the guidance.

public void Get<TAttribute>(object obj, bool inherit) where TAttribute : System.Attribute
{
     var ForeignKeyCollection = typeof(ClassName).GetProperties(BindingFlags.Instance | BindingFlags.Public)
                .Where(p => p.GetCustomAttributes(typeof(TAttribute), true).Any())
                .Select(p => new
                                 {
                                     Property = p,
                                     Attribute = (AssociationAttribute)Attribute.GetCustomAttribute(p, typeof(TAttribute), true)
                                 })
                .Where(p => p.Attribute.IsForeignKey).ToList();
}