如何样用程序判断某个实体里哪几列是主键

怎么样用程序判断某个实体里哪几列是主键?
怎么样用程序判断某个实体里哪几列是主键?

[解决办法]
Product是实体

C# code

foreach (PropertyInfo fi in typeof(Product).GetProperties())            {                if (fi.GetCustomAttributes(false).Length > 0&&fi.GetCustomAttributes(false)[0] is ColumnAttribute)                {                    ColumnAttribute c = fi.GetCustomAttributes(false)[0] as ColumnAttribute;                    if (c.IsPrimaryKey)                    {                        string a = fi.Name;                    }                }            }