C # Use of gzipstream for compression and decompression

When using gzipstream for compression, you must call the close () method at the end. Otherwise, you will find that one byte is missing after decompression. When the compressed file is smaller than 4 kb, the decompressed file is 0 in length.

The following is a complete compressed and decompressed FileCodeFor reference:

         Private   Void Button#click ( Object  Sender, eventargs e ){  String Filename = textbox1.text; //  @ "F: \ response.txt ";  Fileinfo fi = New  Fileinfo (filename); listbox1.items. Add ( "  Source file length:  " + Fi. length. tostring ());  Byte [] Buf = Compress (filename); listbox1.items. Add (string. Format (  "  Compress length: {0}, compress rate: {1: F2} %  " , Buf. length ,( Double ) BUF. length * 100 /( Double  ) Fi. Length )); String Newfilename = string. Format ( @"  {0} \ {1} _ new {2}  "  , Path. getdirectoryname (filename), path. getfilenamewithoutextension (filename), path. getextension (filename); listbox1.items. Add (  "  Decompress length:  " + Decompress (BUF, newfilename). tostring ());}  Public   Static   Byte [] Compress (String  Filename ){  //  Compressed memorystream Memorystream MS = New  Memorystream ();  //  Write Compression Gzipstream compressedstream = New Gzipstream (MS, compressionmode. Compress, True  ); Filestream FS = New Filestream (filename, filemode. Open );  Byte [] Buf = New   Byte [ 1024  ];  Int Count = 0  ;  Do  {Count = FS. Read (BUF, 0  , Buf. Length); compressedstream. Write (BUF,  0 , Count );}  While (Count> 0  ); FS. Close (); compressedstream. Close ();  Return  Ms. toarray ();}  Public   Static   Int Decompress ( Byte [] Data, String  Filename ){  Int Iret =0  ;  Byte [] Buf = New   Byte [ 1024 * 1024  ];  Try  {Filestream FS = New  Filestream (filename, filemode. Create); memorystream MS = New Memorystream (data); gzipstream decompressedstream = New Gzipstream (MS, compressionmode. decompress, True  );  Int Count = 0  ;  Do  {Count = Decompressedstream. Read (BUF, 0  , Buf. Length); FS. Write (BUF,  0 , Count); FS. Flush ();}  While (Count> 0  ); Iret = ( Int  ) Fs. length; FS. Close ();}  Finally  {}  Return  Iret ;}  Private   Void Button3_click (Object  Sender, eventargs e) {openfiledialog Dialog = New  Openfiledialog () {initialdirectory = Environment. currentdirectory, multiselect = False  ,};  If (Dialog. showdialog () = Dialogresult. OK) {textbox1.text = Dialog. filename ;}}