GZipStream解压缩问题 [英] GZipStream decompression issue

问题描述

我们使用GZipStream对MemoryStream数据进行压缩和解压缩。解压缩的数据将输入到DataContract序列化程序，后者将XML转换为.NET对象。最近我们在DataContract反序列化期间遇到了一个问题。当我们分析
的解压缩数据时，它的字符很糟糕。解压后变坏的原因是什么？

  public   静态 的流  GetStreamFromBlob（的 MyBlob   BLOB）
        {
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;的流&NBSP; originalStream&NBSP; =&NBSP; blob.GetStream（的 BlobMode 。开，&NBSP; <跨度风格= "颜色：＃2b91af">的FileAccess  .Read）; 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;的流&NBSP; decompressedStream&NBSP; =&NBSP; < span style ="color：blue"> new    MemoryStream （）; 
             using  （ var   zipStream  =   new    GZipStream （ 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; originalStream，
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;的 CompressionMode  .Decompress））
&NBSP;&NBSP;&NBSP; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; {
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;的尝试 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; {
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; zipStream.CopyTo（decompressedStream）; 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;} 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;的捕获&NBSP;（的 InvalidDataException < /跨度>）
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; {
&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; originalStream.Position&NBSP; =&NBSP; 0; 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; originalStream.CopyTo（decompressedStream）; 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;} 
 
&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; decompressedStream.Position&NBSP; =&NBSP; 0; 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;的返回&NBSP ; decompressedStream; 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;} 
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;} 

部分解压缩数据：

< a：anyType z：Id =" i18569" I：式= QUOT; B：CallIdElem％NT"的xmlns：B =" myNameSpace对象">

它应该是：

<一个：anyType的Z：编号= QUOT; i18569" I：式= QUOT; B：CallIdElement"的xmlns：B =" myNameSpace对象">

解决方案

压缩或早期阶段的数据可能会受到影响吗？

WE use GZipStream for compression and decompression of MemoryStream data. Decompressed data will be input to DataContract serializer, which converts XML to .NET objects. Recently we encountered a problem during DataContract deserialization. When we analyzed the decompressed data, it had a bad character in it. What could be reason for getting bad character after decompression?

public static Stream GetStreamFromBlob(MyBlob blob)
       {
           Stream originalStream = blob.GetStream(BlobMode.Open, FileAccess.Read);
           Stream decompressedStream = new MemoryStream();
           using (var zipStream = new GZipStream(
               originalStream,
               CompressionMode.Decompress))
           {
               try
               {
                   zipStream.CopyTo(decompressedStream);
               }
               catch (InvalidDataException)
               {
                   originalStream.Position = 0;
                   originalStream.CopyTo(decompressedStream);
               }
 
               decompressedStream.Position = 0;
               return decompressedStream;
           }
       }

Part of decompressed data:

<a:anyType z:Id="i18569" i:type="b:CallIdElem%nt" xmlns:b="MyNamespace">

It should have been:

<a:anyType z:Id="i18569" i:type="b:CallIdElement" xmlns:b="MyNamespace">

解决方案

Maybe the data were affected on compression or earlier stages?

这篇关于GZipStream解压缩问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！