如何在If条件下继续使用C＃中的Task

Question

我在.NET应用程序中实现了wcf客户端。我的问题是如何确保在任务＆gt;之后调用条件。完成了？

  private List<MarketingCampaign> _GetAllCampaignTypeList()
    {
        List<MarketingCampaign> _MarketingCampaignList = null;

        Task<List<MarketingCampaignTypeData>> _MarketingCampaignTypeDataList = _MarketingCampaignTypeClientObject.GetAllCampaignTypes();

        ??? // how can I use continue with or Task.wait all in following if condition

        if(_MarketingCampaignTypeDataList!=null)
        {
           // code
        }

        return _MarketingCampaignList;
    }

上面的代码正在调用类

  public async Task<List<App.Client.Proxies.MarketingCampaignTypeServiceRef.MarketingCampaignTypeData>> GetAllCampaignTypes()
    {

        var task  = Task<List<App.Client.Proxies.MarketingCampaignTypeServiceRef.MarketingCampaignTypeData>>.Factory.StartNew(() => {
                                            return _MarketingCampaignTypeClient.GetAllCampaignTypes();
                                      });

        return await task.ConfigureAwait(false);

    }

Answer 1

我相信你需要这样的东西：

async Task<List<MarketingCampaign>> GetAllCampaignTypeList()
{
    List<MarketingCampaign> campaignList = null;

    List<MarketingCampaignTypeData> campaignTypeList = await _MarketingCampaignTypeClientObject.GetAllCampaignTypes();

    if(campaignTypeList != null)
    {
       // do whatever you need to convert campaignTypeList to campaignList
    }

    return campaignList;
}

此外，您在await方法中不需要GetAllCampaignTypes，只需返回任务即可。如果没有正当理由，我建议你不要使用Task.Factory.StartNew。请改为使用Task.Run：http://blog.stephencleary.com/2013/08/startnew-is-dangerous.html