根据您的要求，我为您编写了一个使用C#和Flurl.Http库的下载器程序，用于下载凤凰网的图片。以下是一个简单的示例代码：
代码语言：javascript
复制
```csharp
using System;
using Flurl.Http;
namespace DownloadImage
{
class Program
{
static void Main(string[] args)
{
string url = "https://www.ifeng.com/";
string filePath = "C:\Download\ifeng.com.png";
DownloadImage(url, filePath);
}
static void DownloadImage(string url, string filePath)
{
using (var client = new FlurlClient())
{
var response = client.GetAsync(url).ReceiveJson();
if (response["error"] == null)
{
var imageUrl = response["data"]["imageUrl"].ToString();
DownloadImageToFile(imageUrl, filePath);
}
else
{
Console.WriteLine("下载失败，错误信息：");
Console.WriteLine(response["message"]);
}
}
}
static void DownloadImageToFile(string imageUrl, string filePath)
{
using (var client = new FlurlClient())
{
var response = client.GetAsync(imageUrl).ReceiveString();
var imageBytes = Convert.FromBase64String(response);
using (var fileStream = System.IO.File.Create(filePath))
{
fileStream.Write(imageBytes, 0, imageBytes.Length);
}
}
}
}
}
