entity-framework-core - Entity Framework 7异步集合

Question

Entity Framework 7中的ToListAsync()在哪里。如何在EF 7中使用异步方法返回集合或SingleOrDefault。

 public async Task<IEnumerable<TodoItem>> GetAllAsync()
    {   
        //TODO: ToListAsync missing?         

        return await _context.Todos.ToAsyncEnumerable();
    }

这返回一个错误，其中不包含GetAwaiter的定义？ SaveChangesAsync没有问题。

Answer 1

Microsoft.EntityFrameworkCore命名空间
Microsoft.EntityFrameworkCore命名空间包括async扩展方法。该 namespace 在Microsoft.EntityFrameworkCore包中。这是the source on GitHub，这是其async扩展方法。

AnyAsync()

AllAsync()

CountAsync()

LongCountAsync()

FirstAsync()

FirstOrDefaultAsync()

LastAsync()

LastOrDefaultAsync()

SingleAsync()

SingleOrDefaultAsync()

MinAsync()

MaxAsync()

SumAsync()

AverageAsync()

ContainsAsync()

ToListAsync()

ToArrayAsync()

LoadAsync()

ToDictionaryAsync()

ForEachAsync()

用法示例

project.json

"Microsoft.EntityFrameworkCore": "1.0.0",

ApplicationUserRepository.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;

namespace MyApplication.Models {
    public class ApplicationUserRepository : IApplicationUserRepository
    {
        private ApplicationDbContext _dbContext;

        public ApplicationUserRepository(ApplicationDbContext dbContext) {
            _dbContext = dbContext;
        }

        public async Task<ApplicationUser> Find(Guid id)
        {
            return await _dbContext.Users.SingleAsync(u => u.Id == id);
        }

        public async Task<IEnumerable<ApplicationUser>> GetAll()
        {
            return await _dbContext.Users.ToListAsync();
        }
    }
}