百度地图经纬度纠偏

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/// <summary>
/// 转换为百度经纬度
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static string ChangeToBD(string x, string y)
{
String path = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=" + x + "+&y=" + y + "&callback=BMap.Convertor.cbk_7594";
string res = SendDataByGET(path);
if (res.IndexOf("(") > 0 && res.IndexOf(")") > 0)
{
int sint = res.IndexOf("(") + 1;
int eint = res.IndexOf(")");
int ls = res.Length;
String str = res.Substring(sint, eint - sint);
int errint = res.IndexOf("error") + 7;
int enderr = res.IndexOf("error") + 8;
String err = res.Substring(errint, 1);
if ("0".Equals(err))
{
int sx = str.IndexOf(","x":"") + 6;
int sy = str.IndexOf("","y":"");
int endy = str.IndexOf(""}");
int sl = str.Length;
string xp = str.Substring(sx, sy - sx);
string yp = str.Substring(sy + 7, endy - sy - 7);
byte[] outputb = Convert.FromBase64String(xp);
string XStr = Encoding.Default.GetString(outputb);
outputb = Convert.FromBase64String(yp);
string YStr = Encoding.Default.GetString(outputb);
return XStr + "," + YStr;
}
}
return string.Empty;
}
/// <summary>
/// 通过GET方式发送数据
/// </summary>
/// <param name="Url"></param>
/// <returns></returns>
public static string SendDataByGET(string Url)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "GET";
request.ContentType = "text/html;charset=UTF-8";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}

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String path = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=" + x + "+&y=" + y + "&callback=BMap.Convertor.cbk_7594";