Save and load MemoryStream to from a file

Question

I am serializing an structure into a MemoryStream and I want to save and load the serialized structure   So  How to Save a MemoryStream into a file and also load it back from file

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For anyone looking for the short versions   var memoryStream   new MemoryStream File ReadAllBytes  1 dat      File WriteAllBytes  1 dat   memoryStream ToArray

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The combined answer for writing to a file can be   MemoryStream ms   new MemoryStream        FileStream file   new FileStream  file bin   FileMode Create  FileAccess Write   ms WriteTo file   file Close    ms Close

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I use a Panel Control to add a image or even stream video  but you can save the image on SQL Server as Image or MySQL as largeblob  This code works for me a lot  Check it out   Here you save the image  MemoryStream ms   new MemoryStream    Bitmap bmp   new Bitmap panel1 Width  panel1 Height   panel1 DrawToBitmap bmp  panel1 Bounds   bmp Save ms  System Drawing Imaging ImageFormat Jpeg      here you can change the Image format byte   Pic arr   new byte ms Length   ms Position   0  ms Read Pic arr  0  Pic arr Length   ms Close      And here you can load  but I used a PictureBox Control   MemoryStream ms   new MemoryStream picarr   ms Seek 0  SeekOrigin Begin   fotos pictureBox1 Image   System Drawing Image FromStream ms     Hope helps

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Assuming that MemoryStream name is ms   This code writes down MemoryStream to a file   using  FileStream file   new FileStream  file bin   FileMode Create  System IO FileAccess Write        byte   bytes   new byte ms Length      ms Read bytes  0   int ms Length      file Write bytes  0  bytes Length      ms Close        and this reads a file to a MemoryStream    using  MemoryStream ms   new MemoryStream    using  FileStream file   new FileStream  file bin   FileMode Open  FileAccess Read        byte   bytes   new byte file Length      file Read bytes  0   int file Length      ms Write bytes  0   int file Length       In  Net Framework 4   You can simply copy FileStream to MemoryStream and reverse as simple as this   MemoryStream ms   new MemoryStream    using  FileStream file   new FileStream  file bin   FileMode Open  FileAccess Read       file CopyTo ms     And the Reverse  MemoryStream to FileStream    using  FileStream file   new FileStream  file bin   FileMode Create  System IO FileAccess Write       ms CopyTo file

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The stream should really by disposed of even if there s an exception  quite likely on file I O  - using clauses are my favourite approach for this  so for writing your MemoryStream  you can use   using  FileStream file   new FileStream  file bin   FileMode Create  FileAccess Write         memoryStream WriteTo file       And for reading it back   using  FileStream file   new FileStream  file bin   FileMode Open  FileAccess Read         byte   bytes   new byte file Length       file Read bytes  0   int file Length       ms Write bytes  0   int file Length       If the files are large  then it s worth noting that the reading operation will use twice as much memory as the total file size  One solution to that is to create the MemoryStream from the byte array - the following code assumes you won t then write to that stream   MemoryStream ms   new MemoryStream bytes  writable  false     My research  below  shows that the internal buffer is the same byte array as you pass it  so it should save memory   byte   testData   new byte     104  105  121  97    var ms   new MemoryStream testData  0  4  false  true   Assert AreSame testData  ms GetBuffer

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You may use MemoryStream WriteTo or Stream CopyTo  supported in framework version 4 5 2  4 5 1  4 5  4  methods to write content of memory stream to another stream   memoryStream WriteTo fileStream     Update   fileStream CopyTo memoryStream   memoryStream CopyTo fileStream

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using System  using System Collections Generic  using System Drawing  using System Drawing Imaging  using System IO  using System Text   namespace ImageWriterUtil       public class ImageWaterMarkBuilder                 private ImageWaterMarkBuilder                                   Stream imageStream          string watermarkText      8Bytes Technology           Font font   new System Drawing Font  Brush Script MT   30  FontStyle Bold  GraphicsUnit Pixel           Brush brush   new SolidBrush Color Black           Point position          public ImageWaterMarkBuilder AddStream Stream imageStream                        this imageStream   imageStream              return this                    public ImageWaterMarkBuilder AddWaterMark string watermarkText                        this watermarkText   watermarkText              return this                    public ImageWaterMarkBuilder AddFont Font font                        this font   font              return this                     public ImageWaterMarkBuilder AddFontColour Color color                        this brush   new SolidBrush color               return this                    public ImageWaterMarkBuilder AddPosition Point position                        this position   position              return this                     public void CompileAndSave string filePath                           Read the File into a Bitmap              using  Bitmap bmp   new Bitmap this imageStream  false                                 using  Graphics grp   Graphics FromImage bmp                                             Determine the size of the Watermark text                      SizeF textSize   new SizeF                        textSize   grp MeasureString watermarkText  font                          Position the text and draw it on the image                      if  position    null                          position   new Point  bmp Width -   int textSize Width   10     bmp Height -   int textSize Height   10                         grp DrawString watermarkText  font  brush  position                        using  MemoryStream memoryStream   new MemoryStream                                                    Save the Watermarked image to the MemoryStream                          bmp Save memoryStream  ImageFormat Png                           memoryStream Position   0                            string fileName   Path GetFileNameWithoutExtension filePath                              outPuthFilePath   Path Combine Path GetDirectoryName filePath   fileName     outputh png                            using  FileStream file   new FileStream filePath  FileMode Create  System IO FileAccess Write                                                         byte   bytes   new byte memoryStream Length                               memoryStream Read bytes  0   int memoryStream Length                               file Write bytes  0  bytes Length                               memoryStream Close                                                                                                         Usage  -  ImageWaterMarkBuilder AddStream stream  AddWaterMark     CompileAndSave filePath

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For loading a file  I like this a lot better  MemoryStream ms   new MemoryStream    using  FileStream fs   File OpenRead file         fs CopyTo ms

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Save into a file  Car car   new Car    car Name    Some fancy car   MemoryStream stream   Serializer SerializeToStream car   System IO File WriteAllBytes fileName  stream ToArray       Load from a file   using  var stream   new MemoryStream System IO File ReadAllBytes fileName          Car car    Car Serializer DeserializeFromStream stream       where  using System IO  using System Runtime Serialization  using System Runtime Serialization Formatters Binary   namespace Serialization       public class Serializer               public static MemoryStream SerializeToStream object o                        MemoryStream stream   new MemoryStream                IFormatter formatter   new BinaryFormatter                formatter Serialize stream  o               return stream                     public static object DeserializeFromStream MemoryStream stream                        IFormatter formatter   new BinaryFormatter                stream Seek 0  SeekOrigin Begin               object o   formatter Deserialize stream               return o                         Originally the implementation of this class has been posted here   and   Serializable  public class Car       public string Name

[c#] Save and load MemoryStream to/from a file

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