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考虑这个DAL类似的代码:摆脱泛型类型参数:是否有可能?
mDealerTypes = Read<Dictionary<string, DealerType>, DealerType>(
() => { return DALFactory.Instance.ReadDealerTypes(cn); },
(c, o) => c.Add(o.DealerTypeKey, o));
mCountries = Read<Dictionary<string, Country>, Country>(
() => { return DALFactory.Instance.ReadDealerTypes(cn); },
(c, o) => c.Add(o.Code, o));
private C Read<C, T>(Func<SqlConnection, IDataReader> func, Action<C, T> a)
where C : ICollection, new()
where T : EntityBase, new()
{
C objects = new C();
using (IDataReader reader = func(connection))
{
while (reader.Read())
{
T obj = new T();
obj.Init(reader);
a(objects, obj);
}
}
return objects;
}
为了增强可读性,我想以某种方式改变阅读<的类型参数列表中没有重复两次被存储在集合在此,以使对象>。
mCountries = Read<Dictionary<string, Country>>(
() => { return DALFactory.Instance.ReadDealerTypes(cn); },
(c, o) => c.Add(o.Code, o));
但是如何重写读取<>然后呢?这甚至有可能吗?
私人??阅读(Func键FUNC,行动一)
我个人倒觉得它更具可读性总是从DAL方法返回一个平坦的枚举或集合,然后让调用者通过调用.ToDictionary(o => o.DealerTypeKey)构建字典。 – Joe