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[英]IHttpActionResult vs async Task<IHttpActionResult>
[英]async task lacks await for MVC IHttpActionResult controller
我正在使用一個異步任務來返回我使用數據字典建模的Json數據。 我希望任務在它從我的方法report.GetActiveBuildDefinitions()
和我的CurrentState對象(它有一個構造函數可以獲取我需要的數據report.GetActiveBuildDefinitions()
數據庫調用時異步執行。 這是我正在談論的構造函數-> new CurrentState(BuildDef.ID);
該控制器正常運行。 但是當我啟用警告作為錯誤。 我的課程無法建立。 它要求我將await關鍵字用於異步任務。 我嘗試將其添加到return中,例如return await Json(state);
但隨后出現錯誤“不包含getawaiter的定義”,請幫助
這是我的控制器:
[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);
}
}
我希望任務異步執行
但為什么? 您認為異步會給您帶來什么好處?
提示: async
並不意味着“提前返回”。
當前控制器動作中的所有內容都是同步的,因此您的控制器動作也應該是同步的:
public IHttpActionResult GetBuildState()
現在,如果將您的I / O調用更改為自然異步(即使用EF6異步查詢),那么您的控制器操作可能最終會調用異步方法:
var definitions = await report.GetActiveBuildDefinitionsAsync();
然后,編譯器將告訴您使GetBuildState
異步並將其返回類型更改為Task<IHttpActionResult>
。
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