ASP.NET Web 中进行 GET/POST 提交并接收返回数据的几种方案

在 ASP.NET Web 应用程序中进行 GET 请求并接收返回数据可以通过多种方式实现，以下是几种常见的方法：

1. 使用 WebClient 类（简单方式）

using System.Net;
using System.IO;public string GetDataFromUrl(string url)
{using (WebClient client = new WebClient()){// 设置编码（如果需要）client.Encoding = System.Text.Encoding.UTF8;// 执行GET请求并返回结果return client.DownloadString(url);}
}

2. 使用 HttpClient 类（推荐方式，支持异步）

using System.Net.Http;
using System.Threading.Tasks;public async Task<string> GetDataFromUrlAsync(string url)
{using (HttpClient client = new HttpClient()){// 设置请求头（如果需要）client.DefaultRequestHeaders.Add("User-Agent", "MyApp");// 发送GET请求并获取响应HttpResponseMessage response = await client.GetAsync(url);// 确保请求成功response.EnsureSuccessStatusCode();// 读取响应内容return await response.Content.ReadAsStringAsync();}
}

3. 使用 HttpWebRequest 类（传统方式）

using System.Net;
using System.IO;public string GetDataFromUrl(string url)
{HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);request.Method = "GET";using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())using (Stream stream = response.GetResponseStream())using (StreamReader reader = new StreamReader(stream)){return reader.ReadToEnd();}
}

4. 在 ASP.NET Web Forms 页面中使用

在 Web Forms 页面后台代码中：

protected void Page_Load(object sender, EventArgs e)
{if (!IsPostBack){string apiUrl = "https://example.com/api/data?param1=value1";string result = GetDataFromUrl(apiUrl);// 处理返回的数据lblResult.Text = result;}
}private string GetDataFromUrl(string url)
{// 使用上述任意一种方法实现using (WebClient client = new WebClient()){return client.DownloadString(url);}
}

5. 在 ASP.NET MVC 控制器中使用

using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Mvc;public class HomeController : Controller
{public async Task<ActionResult> GetData(){string apiUrl = "https://example.com/api/data?param1=value1";string result = await GetDataFromUrlAsync(apiUrl);ViewBag.ApiResult = result;return View();}private async Task<string> GetDataFromUrlAsync(string url){using (HttpClient client = new HttpClient()){return await client.GetStringAsync(url);}}
}