Question

我正在使用异步任务来返回我使用数据字典建模的Json数据。我希望任务在从我的方法report.GetActiveBuildDefinitions()和我的CurrentState对象中调用数据时异步执行，该对象具有获取我需要的数据的构造函数。这是我正在谈论的构造函数 - ＆gt; new CurrentState(BuildDef.ID); 该控制器功能正常。但是当我启用警告为错误时。我的课没有建立。它要求我为异步任务使用await关键字。我尝试将其添加到return await Json(state);之类的返回中，但是它会给出一个错误，＆＃34;不包含getawaiter的定义＆＃34;请帮忙

这是我的控制者：

        [HttpGet]
    public async Task<IHttpActionResult> GetBuildState()
    {
        try
        {
            List<CurrentState> state = new List<CurrentState>();
            BuildReport report = new BuildReport();
            List<BuildDefinition> definitions = report.GetActiveBuildDefinitions();
            List<Dictionary<string, string>> buildInfo = new List<Dictionary<string, string>>();

            foreach (BuildDefinition BuildDef in definitions)
            {
                state.Add(new CurrentState(BuildDef.ID));
            }

            foreach (CurrentState build in state)
            {
                Dictionary <string, string> entry = new Dictionary<string, string>();
                if (build.ITestExists)
                {
                    if (build.ITestState && build.BuildState)
                    {
                        entry.Add("BuildDef", build.BuildDefName);
                        entry.Add("GraphCode", "1");
                        entry.Add("WorkingBrokenTime", GetTime(build.BuildDefID));
                        entry.Add("Icon", "1");
                        entry.Add("Id", build.BuildDefID.ToString());
                    }
                    else if(build.BuildState && build.ITestState.Equals(false))
                    {
                        entry.Add("BuildDef", build.BuildDefName);
                        entry.Add("GraphCode", "2");
                        entry.Add("WorkingBrokenTime", GetTime(build.BuildDefID));
                        entry.Add("Icon", "0");
                        entry.Add("Id", build.BuildDefID.ToString());
                    }
                    else if (build.BuildState.Equals(false) && build.ITestState)
                    {
                        entry.Add("BuildDef", build.BuildDefName);
                        entry.Add("GraphCode", "3");
                        entry.Add("WorkingBrokenTime", GetTime(build.BuildDefID));
                        entry.Add("Icon", "0");
                        entry.Add("Id", build.BuildDefID.ToString());
                    }
                    else if (build.ITestState.Equals(false) && build.BuildState.Equals(false))
                    {
                        entry.Add("BuildDef", build.BuildDefName);
                        entry.Add("GraphCode", "0");
                        entry.Add("WorkingBrokenTime", GetTime(build.BuildDefID));
                        entry.Add("Icon", "0");
                        entry.Add("Id", build.BuildDefID.ToString());
                    }

                }
                else
                {
                    if (build.BuildState)
                    {
                        entry.Add("BuildDef", build.BuildDefName);
                        entry.Add("GraphCode", "4");
                        entry.Add("WorkingBrokenTime", GetTime(build.BuildDefID));
                        entry.Add("Icon", "1");
                        entry.Add("Id", build.BuildDefID.ToString());
                    }
                    else
                    {
                        entry.Add("BuildDef", build.BuildDefName);
                        entry.Add("GraphCode", "5");
                        entry.Add("WorkingBrokenTime", GetTime(build.BuildDefID));
                        entry.Add("Icon", "0");
                        entry.Add("Id", build.BuildDefID.ToString());
                    }
                }
                buildInfo.Add(entry);
            }
            return Json(state);
        }
        catch (Exception)
        {
            return BadRequest(ModelState);
        }
    }

Answer 1

我希望任务以异步方式执行

但为什么呢？你觉得异步会给你带来什么好处呢？

提示：async 不意味着“早退”。

当前控制器操作中的所有内容都是同步的，因此您的控制器操作也应该是同步的：

public IHttpActionResult GetBuildState()

现在，如果您将I / O调用更改为自然异步（即使用EF6异步查询），那么您的控制器操作最终可能会调用异步方法：

var definitions = await report.GetActiveBuildDefinitionsAsync();

并且此时，编译器将告诉您使GetBuildState异步并将其返回类型更改为Task<IHttpActionResult>。

异步任务缺少等待MVC IHttpActionResult控制器

1 个答案: