发现C#的一个弱点

写了如下代码:

    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
    public class TypeConditionAttribute<TValue> : Attribute
    {
        /// <summary>
        /// The field name of type field
        /// </summary>
        public string TypeField { get; set; }

        public TValue Value { get; set; }

        public TypeConditionAttribute(string typeField, TValue value)
        {
            TypeField = typeField;
            Value = value;
        }

        public bool Evaluate(object record)
        {
            FieldInfo fieldInfo = record.GetType().GetField(TypeField);
            object value = fieldInfo.GetValue(record);
            return this.Value.Equals((TValue)value);
        }
    }

结果不能编译，原因是“Attribute”是一个特性类，无法从它派生泛型类型。有点出乎意外。