Question

我有以下方法，我想传递一个包含数组，并有实体框架加载和表达式数组中传递的关联：

    public static async Task<T> FindAsync<T>(this GSCMContext context, Expression<Func<T, bool>> match, , params Expression<Func<T, object>>[] includes) where T : BaseEntity
    {
        var set = context.Set<T>();

        if(includes != null)
        {
             foreach (var include in includes)
             {
                set.Include(include);
             }
        }
        return await set<T>().SingleOrDefaultAsync(match);
    }

问题是关联的加载方式与我运行此代码的方式不同：

context.Entities.Include(a => a.association).Find(id)

我不知道为什么我的代码不起作用。

Answer 1

因为您只是忽略了Include方法的结果。您应该修改您的方法以匹配下面的方法：

public static async Task<T> FindAsync<T>(this GSCMContext context, 
        Expression<Func<T, bool>> match, 
        params Expression<Func<T, object>>[] includes)
        where T : BaseEntity
{
    IQuerable<T> query = context.Set<T>();

    if(includes != null)
    {
         foreach (var include in includes)
         {
            // Include returns result
            query = query.Include(include);
         }
    }
    return await query.SingleOrDefaultAsync(match);
}

通用代码而不是DBContext查找不执行包含

1 个答案: