Поиск по всему каталогу

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Моя проблема заключается в следующем: как я могу распаковать файл после поиска в определенном каталоге и подпапках файлов с определенным расширением.
пожалуйста помочь

Строка 146 --> значение ошибки не может быть нулевым...

Что я уже пробовал:

  1  <pre>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          }
 32  
 33          private void button1_Click(object sender, EventArgs e)
 34          {
 35              List<string> filenames = FindFiles(path.Text, exten.Text,check.Checked);
 36              lstFiles.Items.Clear();
 37              foreach (string filename in filenames)
 38              {
 39                  lstFiles.Items.Add(filename);
 40              }
 41          }
 42          private List<string> FindFiles(string dir_name, string patterns, bool search_subdirectories)
 43          {
 44              List<string> files = new List<string>();
 45              string[] pattern_array = patterns.Split(';');
 46              SearchOption search_option = SearchOption.AllDirectories;
 47              foreach (string pattern in pattern_array)
 48              {
 49                  foreach (string filename in Directory.GetFiles(dir_name, pattern, search_option))
 50                  {
 51                      if (!files.Contains(filename)) files.Add(filename);
 52                  }
 53              }
 54              label1.Text = files.Count.ToString();
 55              files.Sort();
 56              return files;
 57          }
 58  
 59          private void lstFiles_SelectedIndexChanged(object sender, EventArgs e)
 60          {
 61  
 62              
 63          }
 64          private byte[] DecompressArray(byte[] content)
 65          {
 66              byte[] array;
 67              int num;
 68              using (MemoryStream memoryStream = new MemoryStream())
 69              {
 70                  using (MemoryStream memoryStream1 = new MemoryStream(content))
 71                  {
 72                      using (GZipStream gZipStream = new GZipStream(memoryStream1, CompressionMode.Decompress))
 73                      {
 74                          byte[] numArray = new byte[1024];
 75                          do
 76                          {
 77                              num = gZipStream.Read(numArray, 0, (int)numArray.Length);
 78                              memoryStream.Write(numArray, 0, num);
 79                          }
 80                          while (num > 0);
 81                      }
 82                  }
 83                  array = memoryStream.ToArray();
 84              }
 85              return array;
 86          }
 87          private void UnzipDirectory(byte[] compressed, string outputPath)
 88          {
 89              IEnumerator enumerator = null;
 90              IEnumerator enumerator1 = null;
 91              if (!Directory.Exists(outputPath))
 92              {
 93                  Directory.CreateDirectory(outputPath);
 94              }
 95              byte[] numArray = this.DecompressArray(compressed);
 96              XmlDocument xmlDocument = new XmlDocument();
 97              using (MemoryStream memoryStream = new MemoryStream(numArray))
 98              {
 99                  xmlDocument.Load(memoryStream);
100                  XmlNode firstChild = xmlDocument.FirstChild;
101                  XmlNode xmlNodes = firstChild.FirstChild;
102                  XmlNode nextSibling = firstChild.FirstChild.NextSibling;
103                  try
104                  {
105                      enumerator = xmlNodes.ChildNodes.GetEnumerator();
106                      while (enumerator.MoveNext())
107                      {
108                          object objectValue = RuntimeHelpers.GetObjectValue(enumerator.Current);
109                          Directory.CreateDirectory(Path.Combine(outputPath, ((XmlNode)objectValue).Attributes.Item(0).Value));
110                      }
111                  }
112                  finally
113                  {
114                      if (enumerator is IDisposable)
115                      {
116                          (enumerator as IDisposable).Dispose();
117                      }
118                  }
119                  try
120                  {
121                      enumerator1 = nextSibling.ChildNodes.GetEnumerator();
122                      while (enumerator1.MoveNext())
123                      {
124                          object obj = RuntimeHelpers.GetObjectValue(enumerator1.Current);
125                          string str = Path.Combine(outputPath, ((XmlNode)obj).Attributes.Item(0).Value);
126                          byte[] numArray1 = Convert.FromBase64String(((XmlNode)obj).InnerText);
127                          File.WriteAllBytes(str, numArray1);
128                      }
129                  }
130                  finally
131                  {
132                      if (enumerator1 is IDisposable)
133                      {
134                          (enumerator1 as IDisposable).Dispose();
135                      }
136                  }
137              }
138          }
139          private void lstFiles_DoubleClick(object sender, EventArgs e)
140          {
141  
142              if (lstFiles.SelectedItem != null)
143              {
144  
145                  lstFiles.SelectedItem.ToString();
146                  FileInfo fileInfo = new FileInfo(fileName);
147                  try
148                  {
149                      if (File.Exists(fileName))
150                      {
151                          UnzipDirectory(File.ReadAllBytes(fileName), fileInfo.DirectoryName);
152                      }
153                  }
154                  catch (Exception exception)
155                  {
156                      ProjectData.SetProjectError(exception);
157                      Interaction.MsgBox("error", MsgBoxStyle.OkOnly, null);
158                      ProjectData.ClearProjectError();
159                      return;
160                  }
161                  Interaction.MsgBox("Complete", MsgBoxStyle.OkOnly, null);
162              }
163          }
164      }
165  }

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