[英]How to return a list of objects in ASP.NET Web API async controller method
如何在ASP.NET Web API异步控制器方法中返回对象列表或在Task对象中包装列表?
类:
public class SubscriberHistory
{
public string Date;
public string Message;
public SubscriberHistory(string Date, string Message)
{
this.Date = Date;
this.Message = Message;
}
}
控制器:
[HttpGet("[action]/{accountNumber}")]
public Task<SubscriberHistory> GetSubscriberHistory(string accountNumber)
{
SubscriberManager subsManager = new SubscriberManager();
return subsManager.GetSubscriberHistoryByAccountNumber(accountNumber);
}
控制器经理:
public async List<SubscriberHistory> GetSubscriberHistory()
{
List<SubscriberHistory> List = new List<SubscriberHistory>();
// HttpClient get data
return List; // ?
}
如果您没有执行任何async
操作,则永远不要从操作方法返回Task
:它没用,并且还会给您的调用增加不必要的开销。
要返回对象列表,只需声明正确的返回类型:
[HttpGet("[action]/{accountNumber}")]
public List<SubscriberHistory> GetSubscriberHistory(string accountNumber)
{
SubscriberManager subsManager = new SubscriberManager();
return subsManager.GetSubscriberHistoryByAccountNumber(accountNumber);
}
相反,如果你想异步地执行它,那么你将不得不返回一个Task<T>
并等待结果:
[HttpGet("[action]/{accountNumber}")]
public async Task<List<SubscriberHistory>> GetSubscriberHistory(string accountNumber)
{
SubscriberManager subsManager = new SubscriberManager();
return await subsManager.GetSubscriberHistoryByAccountNumber(accountNumber);
}
在你的经理:
public async Task<List<SubscriberHistory>> GetSubscriberHistory()
{
List<SubscriberHistory> list = new List<SubscriberHistory>();
var result = await client.GetAsync("http://myhost/mypath");
//Your code here
return list;
}
如果要使用Async Controller,则需要更新代码,如下所示:
[HttpGet("[action]/{accountNumber}")]
public async Task<IHttpActionResult> GetSubscriberHistory(string accountNumber)
{
SubscriberManager subsManager = new SubscriberManager();
return await subsManager.GetSubscriberHistoryByAccountNumber(accountNumber);
}
如果要使用异步控制器,则应在控制器功能中存在异步和等待。 谢谢!
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