How to write the code that silverlight uploads with webclient large files
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Client:
The copy code is as follows:
/ / /
/ / write data to the stream
/ / /
/ / /
/ / /
Public async static Task Write (string url, Stream clientStream)
{
If (clientStream.Length > 25,1024,1024)
Url + = "& twee1"; / / indicates uploading large files
Try
{
Up (url, clientStream)
Return true
}
Catch {}
Return false
}
Public async static Task Up (string url, Stream sourceStream)
{
Var wc = new WebClient ()
Byte [] buffer = new byte [25,1024,1024]
Int bufLen = sourceStream.Read (buffer, 0, buffer.Length)
If (bufLen
< 1) { sourceStream.Close(); return; } wc.WriteStreamClosed += (s, e) =>{
If (sourceStream.CanRead)
Up (url, sourceStream)
Else
SourceStream.Close ()
}
Var serverStream = await wc.OpenWriteTaskAsync (url, "POST")
ServerStream.Write (buffer, 0, bufLen)
ServerStream.Close ()
}
Server:
The copy code is as follows:
Private void Save ()
{
String data = Context.Request.QueryString ["data"] .Base64StringDecode ("ABC")
If (data.IsNullOrEmpty ())
Return
Var m = JsonConvert.DeserializeObject (data)
If (m = = null)
Return
Var isSplitBlock = Context.Request.QueryString ["t"] = = "1"; / / whether to upload parts
# region saves the file
/ / initialize the directory
String dirPath = Path.Combine (ConfigHelper.UploadPath, m.Dir); / / File save path
If (! Directory.Exists (dirPath))
Directory.CreateDirectory (dirPath)
/ / File address
String filePath = Path.Combine (dirPath, m.FileName)
If (! isSplitBlock)
{
If (File.Exists (filePath))
File.Delete (filePath)
}
Int bufLen = 0
Byte [] buffer = new byte [4096]
Using (FileStream fs = new FileStream (filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
Fs.Seek (0, SeekOrigin.End)
/ / write to the original file
Stream sr = Context.Request.InputStream
While ((bufLen = sr.Read (buffer, 0, buffer.Length)) > 0)
Fs.Write (buffer, 0, bufLen)
Sr.Close ()
Sr.Dispose ()
/ / Thumbnail
Try
{
If (! m.NeedThumbnail)
Return
DirPath = Path.Combine (dirPath, "Small")
If (! Directory.Exists (dirPath))
Directory.CreateDirectory (dirPath)
FilePath = Path.Combine (dirPath, m.FileName)
If (File.Exists (filePath))
File.Delete (filePath)
Using (var pic = GetThumbnail (fs, 300,300))
{
Pic.Save (filePath)
}
}
Catch {}
}
# endregion
# region Delete the original file
/ / Delete the original file
If (m.OldFilePath.IsNullOrEmpty ())
{
Return
}
Try
{
FilePath = Path.Combine (ConfigHelper.UploadPath, m.OldFilePath)
If (File.Exists (filePath))
File.Delete (filePath)
If (m.NeedThumbnail)
{
FilePath = Path.Combine (ConfigHelper.UploadPath, m.OldThumbnailImagePath)
If (File.Exists (filePath))
File.Delete (filePath)
}
}
Catch (Exception ex)
{
}
# endregion
}
Note for multipart upload: read the data in blocks after each stream is saved, otherwise multiple blocks will come together, and the data in front of the block stream will be overwritten by the later block stream data.
Pay attention to the process while paying attention to the results
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