如何從F＃中使用HttpClient？

Question

我是F＃的新手，從C＃開發人員的角度理解F＃中的異步。假設在C＃中有以下代碼片段：

var httpClient = new HttpClient(); 
var response = await httpClient.GetAsync(url); 
response.EnsureSuccessStatusCode(); 
string content = await response.Content.ReadAsStringAsync(); 

如何在F＃中編寫相同的代碼？

Answer 1

這是應該做的，你在找什麼（請注意，您必須包裝中的代碼異步計算表達式才能使用的功能讓語法）：

let getAsync (url:string) = 
    async { 
     let httpClient = new System.Net.Http.HttpClient() 
     let! response = httpClient.GetAsync(url) |> Async.AwaitTask 
     response.EnsureSuccessStatusCode() |> ignore 
     let! content = response.Content.ReadAsStringAsync() |> Async.AwaitTask 
     return content 
    } 

Answer 2

您可以使用async：

let readString (url: Uri) = async { 
    let httpClient = new HttpClient(); 
    let! response = httpClient.GetAsync(url) |> Async.AwaitTask 
    response.EnsureSuccessStatusCode() |> ignore 
    return! response.Content.ReadAsStringAsync() |> Async.AwaitTask 
} 

Answer 3

您很可能希望使用Http.fs，如果你在F＃HttpClient做任何事情。