c# - lambda 中的类型推断

Question

我有这个功能:

 public class Repository : IRepository
    {
        public List<TEntity> GetOrdered<TEntity, TSortKey>(Func<TEntity, TSortKey> orderBy, int take, params string[] includePaths) where TEntity : AbstractEntity
        {
            var query = (from ent in this.Context.Set<TEntity>() select ent).IncludePaths(includePaths);

            return query.OrderBy(orderBy).Take(take).ToList();
        }
    }    

调用它:

List<Project> p = repository.GetOrdered<Project, string>(x => x.Name, 10);

我想消除在调用时为它提供第二个通用参数的需要，从 API 的角度来看，这是一个交易破坏者。

怎么做？

Answer 1

it's a deal breaker from an API perspective

然后考虑你的交易破裂......你不能部分推断通用参数。如果您的存储库是通用的，您可以:

 public class Repository<TEntity> : IRepository<TEntity> where TEntity : AbstractEntity
{
    public List<TEntity> GetOrdered<TSortKey>(Func<TEntity, TSortKey> orderBy, int take, params string[] includePaths) 
    {
        var query = (from ent in this.Context.Set<TEntity>() select ent).IncludePaths(includePaths);

        return query.OrderBy(orderBy).Take(take).ToList();
    }
}  

然后做

List<Project> p = repository.GetOrdered(x => x.Name, 10);

但我不知道这种改变是否适合你。