# .NET (/zh/quickstarts/dotnet)
Related: [Node.js](/zh/quickstarts/nodejs.md), [Next.js](/zh/quickstarts/nextjs.md), [Express](/zh/quickstarts/express.md), [NestJS](/zh/quickstarts/nestjs.md), [Fastify](/zh/quickstarts/fastify.md), [Hono](/zh/quickstarts/hono.md)
## 前提条件 [#前提条件]
* .NET 6.0+
* 一个 Firecrawl API 密钥——[免费获取](https://www.firecrawl.dev/app/api-keys)
## 进行网页搜索 [#进行网页搜索]
Firecrawl 可通过 REST API 和 `HttpClient` 与 .NET 集成。
```csharp
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
var apiKey = Environment.GetEnvironmentVariable("FIRECRAWL_API_KEY");
var client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
var content = new StringContent(
JsonSerializer.Serialize(new { query = "firecrawl web scraping", limit = 5 }),
Encoding.UTF8,
"application/json"
);
var response = await client.PostAsync("https://api.firecrawl.dev/v2/search", content);
var json = await response.Content.ReadAsStringAsync();
Console.WriteLine(json);
```
```json
{
"success": true,
"data": {
"web": [
{
"url": "https://docs.firecrawl.dev",
"title": "Firecrawl Documentation",
"markdown": "# Firecrawl\n\nFirecrawl is a web scraping API..."
}
]
}
}
```
## 抓取页面 [#抓取页面]
```csharp
var scrapeContent = new StringContent(
JsonSerializer.Serialize(new { url = "https://example.com" }),
Encoding.UTF8,
"application/json"
);
var scrapeResponse = await client.PostAsync("https://api.firecrawl.dev/v2/scrape", scrapeContent);
var scrapeJson = await scrapeResponse.Content.ReadAsStringAsync();
using var doc = JsonDocument.Parse(scrapeJson);
var markdown = doc.RootElement.GetProperty("data").GetProperty("markdown").GetString();
Console.WriteLine(markdown);
```
```json
{
"success": true,
"data": {
"markdown": "# Example Domain\n\nThis domain is for use in illustrative examples...",
"metadata": {
"title": "Example Domain",
"sourceURL": "https://example.com"
}
}
}
```
## 与页面交互 [#与页面交互]
启动浏览器会话，通过自然语言 prompt 与页面交互，然后关闭会话。
### 第 1 步 — 先抓取，开启会话 [#第-1-步--先抓取开启会话]
```csharp
var sessionContent = new StringContent(
JsonSerializer.Serialize(new { url = "https://www.amazon.com", formats = new[] { "markdown" } }),
Encoding.UTF8,
"application/json"
);
var sessionResponse = await client.PostAsync("https://api.firecrawl.dev/v2/scrape", sessionContent);
var sessionJson = await sessionResponse.Content.ReadAsStringAsync();
using var sessionDoc = JsonDocument.Parse(sessionJson);
var scrapeId = sessionDoc.RootElement
.GetProperty("data")
.GetProperty("metadata")
.GetProperty("scrapeId")
.GetString();
Console.WriteLine($"scrapeId: {scrapeId}");
```
### 第 2 步——发送交互指令 [#第-2-步发送交互指令]
```csharp
var interactUrl = $"https://api.firecrawl.dev/v2/scrape/{scrapeId}/interact";
// 搜索产品
var searchBody = new StringContent(
JsonSerializer.Serialize(new { prompt = "Search for iPhone 16 Pro Max" }),
Encoding.UTF8,
"application/json"
);
var searchResult = await client.PostAsync(interactUrl, searchBody);
Console.WriteLine(await searchResult.Content.ReadAsStringAsync());
// 点击第一个结果
var clickBody = new StringContent(
JsonSerializer.Serialize(new { prompt = "Click on the first result and tell me the price" }),
Encoding.UTF8,
"application/json"
);
var clickResult = await client.PostAsync(interactUrl, clickBody);
Console.WriteLine(await clickResult.Content.ReadAsStringAsync());
```
### 第 3 步 — 结束会话 [#第-3-步--结束会话]
```csharp
await client.DeleteAsync(interactUrl);
Console.WriteLine("会话已停止");
```
## 可复用的客户端类 [#可复用的客户端类]
如果需要重复使用，可将 API 封装为类型化客户端：
```csharp
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
public class FirecrawlClient
{
private readonly HttpClient _http;
private const string BaseUrl = "https://api.firecrawl.dev/v2";
public FirecrawlClient(string apiKey)
{
_http = new HttpClient();
_http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
}
private async Task PostAsync(string endpoint, object payload)
{
var content = new StringContent(
JsonSerializer.Serialize(payload),
Encoding.UTF8,
"application/json"
);
var response = await _http.PostAsync($"{BaseUrl}{endpoint}", content);
response.EnsureSuccessStatusCode();
var json = await response.Content.ReadAsStringAsync();
return JsonDocument.Parse(json);
}
public async Task ScrapeAsync(string url)
{
return await PostAsync("/scrape", new { url });
}
public async Task SearchAsync(string query, int limit = 5)
{
return await PostAsync("/search", new { query, limit });
}
}
// 使用方式
var firecrawl = new FirecrawlClient(Environment.GetEnvironmentVariable("FIRECRAWL_API_KEY")!);
var result = await firecrawl.SearchAsync("firecrawl web scraping");
Console.WriteLine(result.RootElement);
```
## 后续步骤 [#后续步骤]
进行网页搜索并获取完整页面内容
所有抓取选项，包括 formats、actions 和代理
点击、填写表单，并提取动态内容
完整的 REST API 文档