Windows Phone 7实现文件上传
using System; using System.Net;using System.Text;
using System.Collections.Generic;
using System.IO;
namespace ZDWorks.ZDClock.Cloud
{
/// <summary>
/// 文件类型数据的内容参数
/// </summary>
publicclass FileParameter
{
// 文件内容
publicbyte[] File { get; set; }
// 文件名
publicstring FileName { get; set; }
// 文件内容类型
publicstring ContentType { get; set; }
public FileParameter(byte[] file) : this(file, null) { }
public FileParameter(byte[] file, string filename) : this(file, filename, null) { }
public FileParameter(byte[] file, string filename, string contentType)
{
File = file;
FileName = filename;
ContentType = contentType;
}
}
/// <summary>
/// 数据与文件http请求
/// </summary>
publicclass HttpMultipartFormRequest
{
#region Data Members
privatereadonly Encoding DefaultEncoding = Encoding.UTF8;
private ResponseCallback m_Callback;
privatebyte[] m_FormData;
#endregion
#region Constructor
public HttpMultipartFormRequest()
{
}
#endregion
#region Delegate
publicdelegatevoid ResponseCallback(string msg);
#endregion
publicvoid AsyncHttpRequest(string postUri, Dictionary<string, object> postParameters, ResponseCallback callback)
{
// 随机序列，用作防止服务器无法识别数据的起始位置
string formDataBoundary = String.Format("----------{0:N}", Guid.NewGuid());
// 设置contentType
string contentType = "multipart/form-data; boundary=" + formDataBoundary;
// 将数据转换为byte[]格式
m_FormData = GetMultipartFormData(postParameters, formDataBoundary);
// 回调函数
m_Callback = callback;
// 创建http对象
HttpWebRequest request = HttpWebRequest.CreateHttp(new Uri(postUri));
// 设为post请求
request.Method = "POST";
request.ContentType = contentType;
// 请求写入数据流
request.BeginGetRequestStream(GetRequestStreamCallback, request);
}
privatevoid GetRequestStreamCallback(IAsyncResult ar)
{
HttpWebRequest request = ar.AsyncState as HttpWebRequest;
using (var postStream = request.EndGetRequestStream(ar))
{
postStream.Write(m_FormData, 0, m_FormData.Length);
postStream.Close();
}
request.BeginGetResponse(GetResponseCallback, request);
}
privatevoid GetResponseCallback(IAsyncResult ar)
{
// 处理Post请求返回的消息
try
{
HttpWebRequest request = ar.AsyncState as HttpWebRequest;
HttpWebResponse response = request.EndGetResponse(ar) as HttpWebResponse;
using (var stream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(stream);
string msg = reader.ReadToEnd();
if (m_Callback != null)
{
m_Callback(msg);
}
}
}
catch (Exception e)
{
string a = e.ToString();
if (m_Callback != null)
{
m_Callback(string.Empty);
}
}
}
privatebyte[] GetMultipartFormData(Dictionary<string, object> postParameters, string boundary)
{
Stream formDataStream = new MemoryStream();
bool needsCLRF = false;
foreach (var param in postParameters)
{
if (needsCLRF)
{
formDataStream.Write(DefaultEncoding.GetBytes("\r\n"), 0, DefaultEncoding.GetByteCount("\r\n"));
}
needsCLRF = true;
if (param.Value is FileParameter)
{
FileParameter fileToUpload = (FileParameter)param.Value;
string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\";\r\nContent-Type: {3}\r\n\r\n",
boundary,
param.Key,
fileToUpload.FileName ?? param.Key,
fileToUpload.ContentType ?? "application/octet-stream");
// 将与文件相关的header数据写到stream中
formDataStream.Write(DefaultEncoding.GetBytes(header), 0, DefaultEncoding.GetByteCount(header));
// 将文件数据直接写到stream中
formDataStream.Write(fileToUpload.File, 0, fileToUpload.File.Length);
}
else
{
string postData = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}",
boundary,
param.Key,
param.Value);
formDataStream.Write(DefaultEncoding.GetBytes(postData), 0, DefaultEncoding.GetByteCount(postData));
}
}
string tailEnd = "\r\n--" + boundary + "--\r\n";
formDataStream.Write(DefaultEncoding.GetBytes(tailEnd), 0, DefaultEncoding.GetByteCount(tailEnd));
// 将Stream数据转换为byte[]格式
formDataStream.Position = 0;
byte[] formData = newbyte;
formDataStream.Read(formData, 0, formData.Length);
formDataStream.Close();
return formData;
}
}
}
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