> For the complete documentation index, see [llms.txt](https://docs.ipwo.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ipwo.net/kai-fa-zhe-wen-dang/dai-ma-shi-li/c.md).

# C\#

使用 C# 可以通过 [IPWO 代理](https://www.ipwo.net/)发起 HTTP 请求，适用于 API 服务、数据采集与自动化开发场景。

***

### 一、HTTP 代理示例

```csharp
using System.Net;

var handler = new HttpClientHandler
{
    UseProxy = true
};

var proxy = new WebProxy(
    "http://us.ipwo.net:7878"
);

var proxyUsername =
    "username_custom_zone_us";

var proxyPass = "password";

proxy.Credentials =
    new NetworkCredential(
        proxyUsername,
        proxyPass
    );

handler.Proxy = proxy;

var httpClient =
    new HttpClient(handler);

httpClient.Timeout =
    TimeSpan.FromSeconds(15);

var task = httpClient.GetStringAsync(
    "http://ipinfo.io/json"
);

task.Wait();

Console.WriteLine(task.Result);
```

***

### 二、正常返回示例

```json
{
  "ip": "203.0.113.10",
  "country": "US"
}
```

如果返回的 IP：

* 不是本机公网 IP
* 国家地区正确

说明代理已经生效。

***

### 三、增加 Timeout（推荐）

建议：

```csharp
httpClient.Timeout =
    TimeSpan.FromSeconds(30);
```

避免请求长时间卡住。

***

### 四、常见问题

#### [407 Proxy Authentication Required](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/407-proxy-authentication-required.md)

通常是：

* 用户名错误
* 密码错误
* zone 参数错误

***

#### [Timeout 超时](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/chao-shi-timeout.md)

通常是：

* 网络环境异常
* DNS 问题
* 请求超时时间过短

***

#### IP 未变化

请检查：

* 是否正确设置 Proxy
* 请求是否真正走代理

***

### 五、推荐开发建议

推荐：

* 使用海外 VPS
* 增加 timeout
* 增加 Retry 重试机制
* 使用粘性 Session

适用于：

* API 服务
* 自动化程序
* 数据采集
* 企业应用

***

### 六、相关文章

* [Go](/kai-fa-zhe-wen-dang/dai-ma-shi-li/go.md)
* [Java](/kai-fa-zhe-wen-dang/dai-ma-shi-li/java.md)
* [PHP](/kai-fa-zhe-wen-dang/dai-ma-shi-li/java.md) 
* [Python Requests](/kai-fa-zhe-wen-dang/dai-ma-shi-li/python/requests.md)
* [API 调用与批量采集](/dai-li-ji-chu-zhi-shi/api-diao-yong-yu-pi-liang-cai-ji.md)
* [超时 Timeout](/kai-fa-zhe-wen-dang/chang-jian-cuo-wu/chao-shi-timeout.md)


---

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