根据对方提供的URL获取返回的数据流并保存为XML

/// <summary>
/// 请求连接，响应得到数据流，生成XML
/// </summary>
/// <param name="url">请求url</param>
/// <param name="path">存放生成XML的路径</param>
/// <returns></returns>
public bool DownLoadAndCreateXML(string url, string path)
{
try
{
WebRequest request = WebRequest.Create(url);
request.ContentType = "text/xml";
WebResponse response = request.GetResponse();
using (StreamWriter write = new StreamWriter(new FileStream(path, FileMode.Create)))
{
using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8))
{
write.WriteLine(reader.ReadToEnd());
}
}
return true;
}
catch (Exception ex)
{
return false;
}
}

/// <summary>
/// 根据访问URL来返回XML文档流
/// </summary>
/// <param name="Url">访问URL</param>
/// <returns>XML文档流</returns>
public Stream WriteCardToStream(string Url)
{
try
{
WebRequest request = WebRequest.Create(Url);
request.ContentType = "text/xml";
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();
return stream;
}
catch (Exception ex)
{
return null;
}
}

/// <summary>
/// MD5加密方式加密
/// ggh
/// </summary>
/// <param name="s">需要加密的字符串</param>
/// <returns>经过md5加密过的字符串</returns>
public string MD5(string s)
{
byte[] b = Encoding.Default.GetBytes(s);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] result = md5.ComputeHash(b);
s = "";
for (int i = 0; i < result.Length; i++)
{
s += result[i].ToString("x").PadLeft(2, '0');
}
return s;
}