EF 6 Conventions example

Code.cs

    public class StringVarcharFieldConvention : Convention
    {
        public StringVarcharFieldConvention()
        {
            this.Properties()
                .Where(p => p.PropertyType == typeof(string))
                .Configure(c => c.HasColumnType("varchar").HasMaxLength(250))
                ;
        }
    }

    public class AllCapsAndUnderscoresTableNameConvention : Convention
    {

        private string GetTableName(Type type)
        {
            return type.Name.CamelCaseToUnderscore().ToUpper();
        }

        public AllCapsAndUnderscoresTableNameConvention()
        {
            this.Types().Configure(t => t.ToTable(GetTableName(t.ClrType)));
        }
    }

    public class LowerCaseAndUnderscoresColumnNameConvention : Convention
    {
        private string GetColumnName(string name)
        {
            return name.CamelCaseToUnderscore().ToLower();
        }

        public LowerCaseAndUnderscoresColumnNameConvention()
        {
            base.Properties()
                .Configure(row =>
                {
                    row.HasColumnName(GetColumnName(row.ClrPropertyInfo.Name));
                });
        }
    }

    public static class StringExtensions
    {
        public static string CamelCaseToUnderscore(this string input)
        {
            var result = Regex.Replace(input, ".[A-Z]", m => m.Value[0] + "_" + m.Value[1]);
            return result;
        }
    }