C# распаковывает файлы

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  1  using Microsoft.VisualBasic;
  2  using Microsoft.VisualBasic.CompilerServices;
  3  using System;
  4  using System.Collections;
  5  using System.Collections.Generic;
  6  using System.ComponentModel;
  7  using System.Data;
  8  using System.Drawing;
  9  using System.IO;
 10  using System.IO.Compression;
 11  using System.Linq;
 12  using System.Runtime.CompilerServices;
 13  using System.Text;
 14  using System.Threading.Tasks;
 15  using System.Windows.Forms;
 16  using System.Xml;
 17  
 18  namespace SD
 19  {
 20      public partial class Form1 : Form
 21      {
 22          public Form1()
 23          {
 24              InitializeComponent();
 25          }
 26          private string fileName;
 27  
 28          private void Form1_Load(object sender, EventArgs e)
 29          {
 30          }
 31          private void button1_Click(object sender, EventArgs e)
 32          {
 33              List<string> filenames = FindFiles(path.Text, exten.Text,check.Checked);
 34              lstFiles.Items.Clear();
 35              foreach (string filename in filenames)
 36              {
 37                  lstFiles.Items.Add(filename);
 38              }
 39          }
 40          private List<string> FindFiles(string dir_name, string patterns, bool search_subdirectories)
 41          {
 42              List<string> files = new List<string>();
 43              string[] pattern_array = patterns.Split(';');
 44              SearchOption search_option = SearchOption.AllDirectories;
 45              foreach (string pattern in pattern_array)
 46              {
 47                  foreach (string filename in Directory.GetFiles(dir_name, pattern, search_option))
 48                  {
 49                      if (!files.Contains(filename)) files.Add(filename);
 50                  }
 51              }
 52              label1.Text = files.Count.ToString();
 53              files.Sort();
 54              return files;
 55          }
 56          private void lstFiles_SelectedIndexChanged(object sender, EventArgs e)
 57          {
 58          }
 59          private byte[] DecompressArray(byte[] content)
 60          {
 61              byte[] array;
 62              int num;
 63              using (MemoryStream memoryStream = new MemoryStream())
 64              {
 65                  using (MemoryStream memoryStream1 = new MemoryStream(content))
 66                  {
 67                      using (GZipStream gZipStream = new GZipStream(memoryStream1, CompressionMode.Decompress))
 68                      {
 69                          byte[] numArray = new byte[1024];
 70                          do
 71                          {
 72                              num = gZipStream.Read(numArray, 0, (int)numArray.Length);
 73                              memoryStream.Write(numArray, 0, num);
 74                          }
 75                          while (num > 0);
 76                      }
 77                  }
 78                  array = memoryStream.ToArray();
 79              }
 80              return array;
 81          }
 82          private void UnzipDirectory(byte[] compressed, string outputPath)
 83          {
 84              IEnumerator enumerator = null;
 85              IEnumerator enumerator1 = null;
 86              if (!Directory.Exists(outputPath))
 87              {
 88                  Directory.CreateDirectory(outputPath);
 89              }
 90              byte[] numArray = this.DecompressArray(compressed);
 91              XmlDocument xmlDocument = new XmlDocument();
 92              using (MemoryStream memoryStream = new MemoryStream(numArray))
 93              {
 94                  xmlDocument.Load(memoryStream);
 95                  XmlNode firstChild = xmlDocument.FirstChild;
 96                  XmlNode xmlNodes = firstChild.FirstChild;
 97                  XmlNode nextSibling = firstChild.FirstChild.NextSibling;
 98                  try
 99                  {
100                      enumerator = xmlNodes.ChildNodes.GetEnumerator();
101                      while (enumerator.MoveNext())
102                      {
103                          object objectValue = RuntimeHelpers.GetObjectValue(enumerator.Current);
104                          Directory.CreateDirectory(Path.Combine(outputPath, ((XmlNode)objectValue).Attributes.Item(0).Value));
105                      }
106                  }
107                  finally
108                  {
109                      if (enumerator is IDisposable)
110                      {
111                          (enumerator as IDisposable).Dispose();
112                      }
113                  }
114                  try
115                  {
116                      enumerator1 = nextSibling.ChildNodes.GetEnumerator();
117                      while (enumerator1.MoveNext())
118                      {
119                          object obj = RuntimeHelpers.GetObjectValue(enumerator1.Current);
120                          string str = Path.Combine(outputPath, ((XmlNode)obj).Attributes.Item(0).Value);
121                          byte[] numArray1 = Convert.FromBase64String(((XmlNode)obj).InnerText);
122                          File.WriteAllBytes(str, numArray1);
123                      }
124                  }
125                  finally
126                  {
127                      if (enumerator1 is IDisposable)
128                      {
129                          (enumerator1 as IDisposable).Dispose();
130                      }
131                  }
132              }
133          }
134          private void lstFiles_DoubleClick(object sender, EventArgs e)
135          {
136              if (lstFiles.SelectedItem != null)
137              {
138  
139                  lstFiles.SelectedItem.ToString();
140                  FileInfo fileInfo = new FileInfo(fileName);
141                  try
142                  {
143                      if (File.Exists(fileName))
144                      {
145                          UnzipDirectory(File.ReadAllBytes(fileName), fileInfo.DirectoryName);
146                      }
147                  }
148                  catch (Exception exception)
149                  {
150                      ProjectData.SetProjectError(exception);
151                      Interaction.MsgBox("error", MsgBoxStyle.OkOnly, null);
152                      ProjectData.ClearProjectError();
153                      return;
154                  }
155                  Interaction.MsgBox("Complete", MsgBoxStyle.OkOnly, null);
156              }
157          }
158      }
159  }

Что я уже пробовал:

Моя проблема заключается в том, что когда я выбираю файл из списка двойным щелчком мыши, код возврата с ошибкой в строке 140 значение не может быть нулевым...

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