ASP.NET Web Forms：对外发起API请求并在页面显示响应

Question

我发现了很多关于 ASP.NET Web API 的帖子，但没有找到经典 Web Forms 的帖子。我想调用外部 API 并将其结果显示在 883658850 文本字段上。 但是即使 API 调用成功，也没有收到响应（或者至少没有在页面上显示。

C# 后面的代码：

protected void btnOptimize_Click(object sender, EventArgs e) {
  Optimize();
}

public async Task Optimize() {
  string URI = "https://EXTERNAL_API_BASE_URL/POST";
  string auth = "Bearer XXXX";

  var client = new HttpClient();

  MyData data = new MyData();
  data.text = "Hello world";

  string requestBody = JsonConvert.SerializeObject(data);

  var stringContent = new StringContent(requestBody);

  client.DefaultRequestHeaders.Add("Content-Type", "application/json");
  client.DefaultRequestHeaders.Add("Authorization", auth);

  var response = await client.PostAsync(URI, stringContent);

  //display on page's text field
  txtResponse.Value = response.Content.ToString();
}

ASP.NET 页：

<body>
    <form id="form1" runat="server">
        <div>
            <textarea runat="server" id="txtInput"></textarea>
            <asp:Button ID="btnOptimize" runat="server" OnClick="btnOptimize_Click" Text="Generate" />
            <textarea runat="server" id="txtResponse"></textarea>
        </div>
    </form>
</body>

我应该怎么做？ 我应该将 UpdatePanel 添加到我的 ASP.NET 页面吗？

Answer 1

使用ReadAsStringAsync()读取 HttpClient 的响应

string responseBody = await response.Content.ReadAsStringAsync();

请参阅HttpClient Class

Answer 2

由于 Optimize 方法是异步的，请尝试像这样更改代码。

//First change the method so it's async as well.
protected async Task btnOptimize_Click(object sender, EventArgs e) {
  //Then call the Optimize() method using the await keyword.
  await Optimize();
}

public async Task Optimize() {
  string URI = "https://EXTERNAL_API_BASE_URL/POST";
  string auth = "Bearer XXXX";

  var client = new HttpClient();

  MyData data = new MyData();
  data.text = "Hello world";

  string requestBody = JsonConvert.SerializeObject(data);

  var stringContent = new StringContent(requestBody);

  client.DefaultRequestHeaders.Add("Content-Type", "application/json");
  client.DefaultRequestHeaders.Add("Authorization", auth);

  var response = await client.PostAsync(URI, stringContent);

  //display on the page's text field
  //You should get value using the await keyword.
  //response.content also has a method called ReadAsStringAsync(),
  //it should be visible if you are using intellisense in VisualStudio
  txtResponse.Value = await response.Content.ReadAsStringAsync();
}

ASP.NET Web Forms：对外发起API请求并在页面显示响应

问题描述

2 个解决方案

解决方案1
0 2022-12-14 11:40:13

解决方案2
0 2022-12-14 14:01:56

ASP.NET Web Forms：对外发起API请求并在页面显示响应

问题描述

2 个解决方案

解决方案1 0 2022-12-14 11:40:13

解决方案2 0 2022-12-14 14:01:56

解决方案1
0 2022-12-14 11:40:13

解决方案2
0 2022-12-14 14:01:56