public UploadAndDownloadFile DownloadFile(DownloadRequest request)
{
UploadAndDownloadFile result = new UploadAndDownloadFile();
try
{
string filePath = request.FilePath;
FileInfo fileInfo = new FileInfo(filePath);
if (!fileInfo.Exists)
{
throw new FileNotFoundException("File not found", request.FilePath);
}
// 注意：此处不能使用上面的方式进行
// 因为流在客户端接收完成前，不能够关闭
// 所以此处将对象放在了内存中
result.FilePath = request.FilePath;
result.Length = fileInfo.Length;
_fs = File.OpenRead(filePath);
result.FileByteStream = _fs;
}
catch (UnauthorizedAccessException ex)
{
throw new Exception("Download File Error", ex);
}
return result;
}
public void UploadFile(UploadAndDownloadFile request)
{
using (FileStream targetStream = File.OpenWrite(request.FilePath))
{
// 推荐写法
// 分片拷贝字节流
request.FileByteStream.CopyTo(targetStream, 4096);
// 与上面的效果一致
/*
int size = 1024 * 4;
byte[] buf = new byte[size];
size = request.FileByteStream.Read(buf, 0, size);
while (size > 0)
{
targetStream.Write(buf, 0, size);
size = request.FileByteStream.Read(buf, 0, size);
}
**/
}
}
private void Upload()
{
if (FileUpload_Main.HasFile)
{
TransferServiceClient clientUpload = new TransferServiceClient("basicHttpUpload");
UploadAndDownloadFile uploadRequestInfo = new UploadAndDownloadFile
{
FilePath = Path.Combine(Server.MapPath("~/TempFiles"), FileUpload_Main.FileName),
Length = FileUpload_Main.PostedFile.InputStream.Length,
FileByteStream = FileUpload_Main.PostedFile.InputStream
};
clientUpload.UploadFile(uploadRequestInfo);
}
}
