c#-用MOQ模拟异步获取方法

我如何摆脱此错误消息：

Error   5   Cannot implicitly convert type 'System.Threading.Tasks.Task<System.Collections.Generic.IEnumerable<TGB.Business.DTO.SchoolyearDTO>>' to 'System.Collections.Generic.IEnumerable<TGB.Business.DTO.SchoolyearDTO>'. An explicit conversion exists (are you missing a cast?)   

我以为我的Task.FromResult可以解决这个问题,但是没有…

mockService.Setup<IEnumerable<SchoolyearDTO>>(c => c.GetSchoolyears()).Returns(
                    Task.FromResult(Enumerable.Empty<SchoolyearDTO>()));

public async Task<IEnumerable<SchoolyearDTO>> GetSchoolyearsAsync()
{
    var schoolyears = await ...
}

解决方法:

GetSchoolyearsAsync是一种异步方法,因此它返回Task< IEnumerable< SchoolyearDTO>>.而不仅仅是IEnumerable< SchoolyearDTO>.您需要在SetupGet的类型参数中指定

mockService.SetupGet<Task<IEnumerable<SchoolyearDTO>>>(c => c.GetSchoolyears()).
    Returns(Task.FromResult(Enumerable.Empty<SchoolyearDTO>()));

标签：async-await,moq,c,net
来源： https://codeday.me/bug/20191120/2041704.html