C ＃ get the information of the selected file

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       private 
       
       bool 
       
       GetDocuContent(
       
       out 
       
       byte[] 
       
       Content, 
       
       out 
       
       string 
       
       FileName, 
       
       out 
       
       string 
       
       ExtensionName)
       
       
        {
       
       
            
       
       long 
       
       MaxLength 
       
       = 
       
       10485760; 
       
       //10M within 
       
       
            
       
       Content 
       
       = 
       
       null;
       
       
            
       
       ExtensionName 
       
       = 
       
       string.
       
       Empty;
       
       
            
       
       FileName 
       
       = 
       
       string.
       
       Empty;
       
       
            
       
       OpenFileDialog 
       
       vsOpenFileDialog 
       
       = 
       
       new 
       
       OpenFileDialog();
       
       
            
       
       vsOpenFileDialog.
       
       InitialDirectory 
       
       = 
       
       "d:\\";
       
       
            
       
       vsOpenFileDialog.
       
       Filter 
       
       = 
       
       "All files (*.*)|*.*";
       
       
            
       
       vsOpenFileDialog.
       
       FilterIndex 
       
       = 
       
       0;
       
       
            
       
       vsOpenFileDialog.
       
       Multiselect 
       
       = 
       
       false;
       
       
            
       
       try
       
       
            {
       
       
                
       
       if (
       
       vsOpenFileDialog.
       
       ShowDialog() 
       
       == 
       
       DialogResult.
       
       OK)
       
       
                {
       
       
                    
       
       //Path.GetExtension Method : Returns the extension of the specified path string 
       
       
                    
       
       ExtensionName 
       
       = 
       
       Path.
       
       GetExtension(
       
       vsOpenFileDialog.
       
       FileName);
       
       
                    
       
       //Path.GetFileName Method : Returns the file name and extension of the specified path string .
       
       
                    
       
       FileName 
       
       = 
       
       Path.
       
       GetFileName(
       
       vsOpenFileDialog.
       
       FileName);
       
       
                    
       
       FileInfo 
       
       vsFileInfo 
       
       = 
       
       new 
       
       FileInfo(
       
       vsOpenFileDialog.
       
       FileName);
       
       
                    
       
       if (
       
       vsFileInfo.
       
       Length 
       
       > 
       
       MaxLength)
       
       
                    {
       
       
                        
       
       MessageBox.
       
       Show(
       
       " File is too long ！");
       
       
                        
       
       return 
       
       false;
       
       
                    }
       
       
                    
       
       //vsFileInfo.OpenRead Method:Creates a read-only FileStream.
       
       
                    
       
       FileStream 
       
       fileStream 
       
       = 
       
       vsFileInfo.
       
       OpenRead();
       
       
                    
       
       if (
       
       fileStream.
       
       Length 
       
       == 
       
       0)
       
       
                    {
       
       
                        
       
       MessageBox.
       
       Show(
       
       " Empty file ！");
       
       
                        
       
       return 
       
       false;
       
       
                    }
       
       
                    
       
       Content 
       
       = 
       
       new 
       
       byte[
       
       fileStream.
       
       Length];
       
       
                    
       
       int 
       
       Size 
       
       = 
       
       fileStream.
       
       Read(
       
       Content, 
       
       0, 
       
       Convert.
       
       ToInt32(
       
       fileStream.
       
       Length));
       
       
                    
       
       fileStream.
       
       Close();
       
       
                    
       
       return 
       
       true;
       
       
                }
       
       
                
       
       return 
       
       false;
       
       
            }
       
       
            
       
       catch (
       
       Exception 
       
       ex)
       
       
            {
       
       
                
       
       return 
       
       false;
       
       
            }
       
       
        }
      
      
      
      

       
       
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Note ：

1、 ​ ​C# Winform OpenFileDialog Control ​​

2、C# FileStream.Read Method

If the selected file 1111.png, Is the tracking content display ：

ExtensionName = Path.GetExtension(vsOpenFileDialog.FileName)

FileName = Path.GetFileName(vsOpenFileDialog.FileName)

FileInfo vsFileInfo = new FileInfo(vsOpenFileDialog.FileName)

Content = new byte[fileStream.Length]

4、 If relative return byte[] Content If the encryption , have access to ：Convert.ToBase64String(Content), The return value of this function , Is still ：byte[] Type of .