C#实现异地文件复制

在C#中实现异地文件复制通常涉及到I/O操作和网络通信。你可以使用`System.IO.File.Copy`方法结合`System.Net.Http`或者`System.Net.WebClient`来跨域复制文件。以下是基本的步骤：

1. **使用`File.Copy`和`WebClient`**:

using System;
using System.IO;
using System.Net;

public static void CopyRemoteFile(string sourceUrl, string destinationPath)
{
    try
    {
        // 创建WebClient实例
        WebClient client = new WebClient();
        
        // 下载文件到内存流
        byte[] bytes = client.DownloadData(sourceUrl);

        // 将数据写入本地文件
        using (FileStream fs = File.Create(destinationPath))
        {
            fs.Write(bytes, 0, bytes.Length);
        }
        Console.WriteLine($"文件已从{sourceUrl}复制到{destinationPath}");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"文件复制失败: {ex.Message}");
    }
}

2. **使用`HttpClient`**:

using System;
using System.Net.Http;
using System.Threading.Tasks;

public async static Task CopyRemoteFileAsync(string sourceUrl, string destinationPath)
{
    using HttpClient httpClient = new HttpClient();
    
    try
    {
        HttpResponseMessage response = await httpClient.GetAsync(sourceUrl);
        response.EnsureSuccessStatusCode();

        byte[] bytes = await response.Content.ReadAsByteArrayAsync();
        await File.WriteAllBytesAsync(destinationPath, bytes);
        Console.WriteLine($"文件已从{sourceUrl}复制到{destinationPath}");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"文件复制失败: {ex.Message}");
    }
}

记得处理可能出现的异常，并确保源地址可以正常访问。