LBS云端数据删除和上传

     这里采用C#模拟表单提交，实现LBS云端删除和csv格式文件的上传。

     删除：

 1 /// <summary>
 2         /// 从LBS云端删除数据
 3         /// </summary>
 4         /// <param name="ak">百度密钥</param>
 5         /// <param name="geotable_id">LBS云geotableID</param>
 6         /// <param name="columnName">字段名称</param>
 7         /// <param name="columnValue">值(为空时则删除所有匹配的数据)</param>
 8         /// <returns></returns>
 9         public string DeleteByName(string ak, string geotable_id, string columnName, string columnValue)
10         {
11            string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
12             //请求 
13             WebRequest req = WebRequest.Create(@"http://api.map.baidu.com/geodata/v2/poi/delete");
14             req.Method = "POST";
15             req.ContentType = "multipart/form-data; boundary=" + boundary;
16             //组织表单数据 
17             StringBuilder sb = new StringBuilder();
18             sb.Append("--" + boundary);
19             sb.Append("\r\n");
20 
21             sb.Append("Content-Disposition: form-data; name=\"ak\"");
22             sb.Append("\r\n\r\n");
23             sb.Append(ak);
24             sb.Append("\r\n");
25             sb.Append("--" + boundary);
26             sb.Append("\r\n");
27 
28             sb.Append("Content-Disposition: form-data; name=\"geotable_id\"");
29             sb.Append("\r\n\r\n");
30             sb.Append(geotable_id);
31             sb.Append("\r\n");
32             sb.Append("--" + boundary);
33             sb.Append("\r\n");
34 
35             sb.Append("Content-Disposition: form-data; name=\"" + columnName + "\"");
36             sb.Append("\r\n\r\n");
37             sb.Append(columnValue);
38             sb.Append("\r\n");
39             sb.Append("--" + boundary);
40             sb.Append("\r\n");
41 
42 
43             string head = sb.ToString();
44             byte[] form_data = Encoding.UTF8.GetBytes(head);
45             //结尾 
46             byte[] foot_data = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
47           
48             //post总长度 
49             long length = form_data.Length +  foot_data.Length;
50             req.ContentLength = length;
51             Stream requestStream = req.GetRequestStream();
52 
53             //发送表单参数 
54             requestStream.Write(form_data, 0, form_data.Length);
55            
56             //结尾 
57             requestStream.Write(foot_data, 0, foot_data.Length);
58             requestStream.Close();
59 
60 
61             //响应 
62             WebResponse pos = req.GetResponse();
63             StreamReader sr = new StreamReader(pos.GetResponseStream(), Encoding.UTF8);
64             string html = sr.ReadToEnd().Trim();
65             sr.Close();
66             if (pos != null)
67             {
68                 pos.Close();
69                 pos = null;
70             }
71             if (req != null)
72             {
73                 req = null;
74             }
75             return html;
76         }

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