using (MemoryStream memoryStream = …) { var imageSource = new BitmapImage(); imageSource.BeginInit(); imageSource.StreamSource = memoryStream; imageSource.EndInit(); // Assign the Source property of your image image.Source = imageSource; }
Because this is the algorithm for how it expands its capacity. public override void Write(byte[] buffer, int offset, int count) { //… Removed Error checking for example int i = _position + count; // Check for overflow if (i < 0) throw new IOException(Environment.GetResourceString(“IO.IO_StreamTooLong”)); if (i > _length) { bool mustZero = _position > _length; … Read more
Add bi.CacheOption = BitmapCacheOption.OnLoad directly after your .BeginInit(): BitmapImage bi = new BitmapImage(); bi.BeginInit(); bi.CacheOption = BitmapCacheOption.OnLoad; … Without this, BitmapImage uses lazy initialization by default and stream will be closed by then. In first example you try to read image from possibly garbage-collected closed or even disposed MemoryStream. Second example uses file, which is … Read more
The FileStreamResult will do that for you. When in doubt always check the code, because the code never lies and since ASP.NET MVC is open source it’s even more easy to view the code. A quick search on Google for FileStreamResult.cs lets you verify that in the WriteFile method the stream is correctly disposed using … Read more
The code you have is unnecessarily complex, even for older Delphi versions. Why should fetching the string version of a stream force the stream’s memory to be reallocated, after all? function MemoryStreamToString(M: TMemoryStream): string; begin SetString(Result, PChar(M.Memory), M.Size div SizeOf(Char)); end; That works in all Delphi versions, not just Delphi 2009. It works when the … Read more
According to source code here aspnet/AspNetWebStack/blob/master/src/System.Web.Mvc/FileStreamResult.cs Yes protected override void WriteFile(HttpResponseBase response) { // grab chunks of data and write to the output stream Stream outputStream = response.OutputStream; using (FileStream) { byte[] buffer = new byte[BufferSize]; while (true) { int bytesRead = FileStream.Read(buffer, 0, BufferSize); if (bytesRead == 0) { // no more data break; … Read more
You could do: MemoryStream memoryStream = new MemoryStream(); TextWriter tw = new StreamWriter(memoryStream); tw.WriteLine(“ref\tACCOUNT\tbatch\tDEBIT\tCREDIT\tDesc”);
I’m assuming that your input data is binary (not text), and that you want to extract chunks of binary data from it. All without making a copy of your input data. You can combine boost::iostreams::basic_array_source and boost::iostreams::stream_buffer (from Boost.Iostreams) with boost::archive::binary_iarchive (from Boost.Serialization) to be able to use convenient extraction >> operators to read chunks … Read more
WriteTo() is resetting the read position to zero before copying the data – CopyTo() on the other hand will copy whatever data remains after the current position in the stream. That means if you did not reset the position yourself, no data will be read at all. Most likely you just miss the following in … Read more
.NET is a managed environment: specifically, memory allocation is usually managed on your behalf by the .NET runtime. You don’t typically need to allocate the memory yourself. Sometimes, however, you do need to inform the runtime when you’ve finished with memory by using Close() or Dispose(). The using statement can be used to wrap a … Read more