如何使用RestSharp与异步/计谋 [英] How to use RestSharp with async/await

问题描述

我苦苦寻找的使用RestSharp与异步一些异步C＃code和计谋。我知道有由哈克<是一个新的更新/一>，但我不知道如何使用新的方法。

I'm struggling to find a modern example of some asynchronous C# code that uses RestSharp with async and await. I know there's been a recent update by Haack but I don't know how to use the new methods.

另外，我怎样才能提供一个取消标记使操作可以取消（比方说，如果一个人厌倦了等待和presses取消在应用程序的UI按钮）。

Also, how can I provide a cancellation token so that the operation can be canceled (say, if a person is sick of waiting and presses the Cancel button in the app's UI).

推荐答案

那么，更新哈克是指已经由我:)那么让我来告诉你如何使用它，因为它其实很简单。 previously你有一个像 ExecuteAsyncGet 方法，将返回 RestRequestAsyncHandle 名为RestSharp自定义类型。这种类型不能等待为异步/计谋适用于工作和任务＆LT; T＆GT; 返回类型。我拉的请求添加到重载返回任务＆LT现有的异步方法; T＆GT; 实例。这些任务＆LT; T＆GT; 重载有一个额外的任务字符串添加到他们的名字，例如任务＆LT; T＆GT; 重载 ExecuteAsyncGet 叫 ExecuteGetTaskAsync＆LT; T＆GT; 。对于每一个新的任务＆LT的; T＆GT; 重载有没有需要一个方法的CancellationToken 来指定，还有一个没有。

Well, the update Haack is referring to has been made by me :) So let me show you how to use it, as it is actually very simple. Previously you had methods like ExecuteAsyncGet that would return a RestSharp custom type named RestRequestAsyncHandle. This type could not be awaited as async/await works on Task and Task<T> return types. My pull-request added overloads to the existing async methods that return Task<T> instances. These Task<T> overloads have an added "Task" string added to their names, for example the Task<T> overload for ExecuteAsyncGet is called ExecuteGetTaskAsync<T>. For each of the new Task<T> overloads there is one method that does not require a CancellationToken to be specified and there is one that does.

因此​​，现在到一个实际的例子就如何使用它，这也将展示如何使用的CancellationToken ：

So now on to an actual example on how to use it, which will also show how to use a CancellationToken:

private static async void Main()
{
    var client = new RestClient();
    var request = new RestRequest("http://www.google.com");
    var cancellationTokenSource = new CancellationTokenSource();

    var restResponse = await client.ExecuteTaskAsync(request, cancellationTokenSource.Token);

    Console.WriteLine(restResponse.Content); // Will output the HTML contents of the requested page
}

这将使用 ExecuteTaskAsync 重载返回任务＆LT; IRestResponse＆GT; 实例。因为它返回一个工作，您可以使用计谋关键字这种方法并获得返回的任务＆LT; T＆GT; 的返回类型（在这种情况下， IRestResponse ）。

This will use the ExecuteTaskAsync overload that returns a Task<IRestResponse> instance. As it returns a Task, you can use the await keyword on this method and get returned the Task<T>'s returned type (in this case IRestResponse).

您可以在这里找到code： http://dotnetfiddle.net/tDtKbL

You can find the code here: http://dotnetfiddle.net/tDtKbL

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