C# WebClient 多文件上传实现

public static void sendRecord2Server(DirectoryInfo di)
{

DirectoryInfo[] ds = di.GetDirectories();
foreach (DirectoryInfo d in ds)
{
sendRecord2Server(d);
}

ServerAddr s = getServerAddr();

FileInfo[] fs = di.GetFiles();

if (fs.Length == 0)
{
return;
}
WebClient wc = new WebClient();

string url = "http://" + s.ip + ":" + s.port + "/" + Consts.WebServerProjectName + "/uploadRecord";

string boundary = headers(wc);
byte[] data = sendBatchRecordFile(fs, boundary);

byte[] resp = uploadData(wc, url, data);

string res = Encoding.UTF8.GetString(resp);
Result r = json2Result(res);

if (r != null && r.Success)
{
foreach (FileInfo f in fs)
{
f.MoveTo(Consts.OldRecordDirectory + "\\" + f.Name);
//f.Delete();
}

}
else
{
throw new Exception("定时:考勤数据文件上传失败!");
}
//}
wc.Dispose();

}

private static string headers(WebClient wc)
{
Guid g = Guid.NewGuid();
string boundary = g.ToString();
boundary = boundary.Replace("-", "");
boundary = "----" + boundary;
//MessageBox.Show("boundary is :" + boundary);

wc.Headers.Add("Content-Type", "multipart/form-data; boundary=" + boundary);

return boundary;
}

private static byte[] sendBatchRecordFile(FileInfo[] fs, string boundary)
{
byte[] data = null;
int len = 0;
if (fs.Length < 10)
{
len = fs.Length;
}
else
{
len = fs.Length;
}

string d = "";
for (int i = 0; i < len; i++)
{

using (StreamReader sr = new StreamReader(fs[i].FullName))
{
string part = partHeader(boundary, "recordFile", fs[i].Name, "text/plain");
string line = "";
while ((line = sr.ReadLine()) != null)
{
part += line + "\r\n";
}
d += part;
}

d += "\r\n";
}
d += "\r\n" + partEnd(boundary);
//MessageBox.Show(d);
data = utf8(d);
return data;
}

private static string partHeader(string boundary, string name, string filename, string contentType)
{
boundary = "--" + boundary + "\r\n";
string partHeader = "Content-Disposition: form-data; name=" + name + "; filename=" + filename + "\r\n";
contentType = "Content-Type: " + contentType + "\r\n\r\n";

partHeader = boundary + partHeader + contentType;
return partHeader;

}
private static byte[] utf8(string s)
{
return Encoding.UTF8.GetBytes(s);
}
private static string partEnd(string boundary)
{
boundary = "--" + boundary + "--";
return boundary;
}

private static byte[] uploadData(WebClient wc, string url, byte[] data)
{
return wc.UploadData(url, "post", data);
}