'HttpWebRequest' does not contain a definition for &

本文关键字：definition for does HttpWebRequest not contain | 更新日期: 2023-09-27 18:23:42

我是xamarin和visual studio的新手，我遵循了微软的教程：

在此处输入链接描述

创建一个跨平台的应用程序，但我得到了这个错误：

'HttpWebRequest' does not contain a definition for 'GetResponseAsync' and no extension method 'GetResponseAsync' accepting a first argument of type 'HttpWebRequest' was found (a using directive or an assembly reference is it missing * ?)

这是我收到错误的代码：DataService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using Newtonsoft.Json;
namespace shared
{
    //This code shows one way to process JSON data from a service
    public class DataService
    {
        public static async Task<dynamic> getDataFromService(string queryString)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(queryString);
            var response = await request.GetResponseAsync().ConfigureAwait(false);
            var stream = response.GetResponseStream();
            var streamReader = new StreamReader(stream);
            string responseText = streamReader.ReadToEnd();
            dynamic data = JsonConvert.DeserializeObject(responseText);
            return data;
        }
    }
}

请告诉我如何解决它，我检查了HttpWebRequest文档，但我没有很好地解决这个问题感谢的帮助

'HttpWebRequest' does not contain a definition for &

不确定HttpWebRequest，但一种更新的、现在推荐的获取数据的方法如下：

public static async Task<dynamic> getDataFromService(string queryString)
{
    using (var client = new HttpClient())
    {
         var responseText = await client.GetStringAsync(queryString);
         dynamic data = JsonConvert.DeserializeObject(responseText);
         return data;
    }
}

试试看，让我知道它是否有效。

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