/// <summary>
/// 异步上传文件
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public static async Task <string> UploadFileAsync(HttpClientUpload param)
{
return(await Task.Run(() => { return UploadFile(param); }));
}
/// <summary>
/// 上传文件
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public static string UploadFile(HttpClientUpload param)
{
var rq = (HttpWebRequest)WebRequest.Create(param.Url);
rq.Method = "POST";
//rq.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
var fileMemoryStream = new MemoryStream(); //文件写入流
string boundary = "---------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
rq.ContentType = $"multipart/form-data; boundary={boundary}";
if (param.Files != null && param.Files.Count > 0)
{
param.Files.ForEach(files =>
{
var postStream = new MemoryStream();
//读取文件流
if (string.IsNullOrWhiteSpace(files.FileName))
{
files.FileName = Path.GetFileName(files.FilePath);
}
var fileStream = new FileStream(files.FilePath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
StringBuilder fileFormdataTemplate = new StringBuilder();
fileFormdataTemplate.Append("--" + boundary + "\r\n");
fileFormdataTemplate.Append("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n");
fileFormdataTemplate.Append("Content-Type: application/octet-stream\r\n\r\n");
var formHeader = string.Format(fileFormdataTemplate.ToString(), files.Name, files.FileName);
//头部边界线
var formHeaderBytes = Encoding.UTF8.GetBytes(formHeader);
//写入头部边界线
postStream.Write(formHeaderBytes, 0, formHeaderBytes.Length);
//写入文件内存流
if (fileStream != null)
{
byte[] fileBuffer = new byte[1024];
int filebytesRead = 0;
while ((filebytesRead = fileStream.Read(fileBuffer, 0, fileBuffer.Length)) != 0)
{
postStream.Write(fileBuffer, 0, filebytesRead);
}
}
//文件换行
var fileLine = Encoding.UTF8.GetBytes("\r\n");
postStream.Write(fileLine, 0, fileLine.Length);
//写入到总流
fileMemoryStream.Write(postStream.ToArray(), 0, postStream.ToArray().Length);
postStream.Close();
postStream.Dispose();
});
}
//边界线
var footer = Encoding.ASCII.GetBytes("--" + boundary + "--\r\n");
fileMemoryStream.Write(footer, 0, footer.Length);
var data = fileMemoryStream.ToArray();
rq.ContentLength = data.Length;
//写入流
using (Stream requestStream = rq.GetRequestStream())
{
requestStream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)rq.GetResponse();
using (var responseStream = response.GetResponseStream())
{
using (var myStreamReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8")))
{
return(myStreamReader.ReadToEnd());
}
}
}