C# 在线文件下载

C# 在线文件下载

方法一和方法二都可以下载文件

/// <summary>
/// 文件下载
/// </summary>
/// <param name="url">URL地址</param>
/// <param name="name">文件名</param>
/// <param name="path">路径</param>
/// <returns>运行结果</returns>
public bool FileDownload(string url,string name,string path) {
	bool value=false;
	if (path==""||path==null) {
		path="C:\\Users\\Administrator\\.XMusicPlayer\\Music";
	}
	if (!path.EndsWith("\\")) {
		path+="\\";
	}
	string fullpath = path + name+url.Substring(url.LastIndexOf("."));
	if (File.Exists(fullpath)) {
		File.Delete(fullpath);
	}
	HttpWebRequest request = null;//HTTP请求
	HttpWebResponse response = null; //HTTP响应
	BufferedStream streamWrite = null; //缓冲流
	FileStream file = null; //文件流
	Stream stream = null; //流
	try {
		request=WebRequest.CreateHttp(url);//向指定的URL地址发送请求
		response=(HttpWebResponse)request.GetResponse();//获取响应
		long fileLength = response.ContentLength;//获取响应的长度
		stream=request.GetRequestStream();//获取响应流
		Byte[] bytes = new Byte[fileLength];//创建等长度的字节数组
		stream.Read(bytes,0,bytes.Length);//将流读入到字节数组中
		file=new FileStream(fullpath,FileMode.CreateNew);//建立要下载的文件
		file.SetLength(fileLength);//设置文件的大小
		streamWrite=new BufferedStream(file);//得到文件的写入流
		streamWrite.Write(bytes,0,bytes.Length);//向文件中写入字节数组
		System.Media.SystemSounds.Beep.Play();
		value=true;
	} catch (Exception e) {
		value=false;
		ErrorLog.WriteError(e.ToString(),3);
	} finally {
		if (response!=null) {
			response.Close();
		}
		if (streamWrite!=null) {
			streamWrite.Close();
		}
		if (stream!=null) {
			stream.Close();
		}
		if (file!=null) {
			file.Close();
		}
	}
	return value;
}

/// <summary>
/// 文件下载
/// </summary>
/// <param name="url">URL地址</param>
/// <param name="name">文件名</param>
/// <param name="path">路径</param>
/// <returns>运行结果</returns>
public static bool FileDownloads(string url,string name,string path) {
	bool value=false;
	if (path==""||path==null) {
		path="C:\\Users\\Administrator\\.XMusicPlayer\\Music";
	}
	if (!path.EndsWith("\\")) {
		path+="\\";
	}
	string fullpath = path + name+url.Substring(url.LastIndexOf("."));
	if (File.Exists(fullpath)) {
		File.Delete(fullpath);
	}
	WebResponse response = null;
	HttpWebRequest request=null;
	BufferedStream write=null;
	Stream read = null;
	FileStream file=null;
	try {
		request=(HttpWebRequest)WebRequest.Create(url);
		response=request.GetResponse();
		read=response.GetResponseStream();
		file=new FileStream(fullpath,FileMode.CreateNew);
		file.SetLength(response.ContentLength);
		byte[] bytes=new byte[response.ContentLength];
		read.Read(bytes,0,bytes.Length);
		write=new BufferedStream(file);
		write.Write(bytes,0,bytes.Length);
		write.Flush();
		value=true;
		System.Media.SystemSounds.Beep.Play();
	} catch (Exception e) {
		value=false;
	} finally {
		if (response!=null) {
			response.Close();
		}
		if (write!=null) {
			write.Close();
		}
		if (file!=null) {
			file.Close();
		}
		if (read!=null) {
			read.Close();
		}
	}
	return value;
}