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  • Convert file to Byte Array and Get back file from Byte Array

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    In this article, we will learn how to convert a file into byte array and get back the original file from the byte array via FileUpload control.

     

    Step 1: Create a page having control FileUpload and Button

     

    <div>
       <asp:FileUpload ID="FileUpload1" runat="server"  />
       <asp:Button ID="btnGetFile" runat="server" Text="GetFile" OnClick="btnGetFile_Click"/>
    </div>
    

     

    Step 2: On button click, call function FileToByteArray and GetDocument

     

     protected void btnGetFile_Click(object sender, EventArgs e)
        {
            string fileName = FileUpload1.PostedFile.FileName;
    
            //To convert file into byte array
            byte[] byteArray = FileToByteArray(FileUpload1.PostedFile.InputStream);
    
            //To get back file from byte array
            GetDocument(fileName, byteArray);
        }

     

    Step 3: Write FileToByteArray function to convert file into byte array

     

    public byte[] FileToByteArray(Stream fileStream)
        {
            byte[] buffer = new byte[fileStream.Length];
            using (MemoryStream ms = new MemoryStream())
            {
                int read;
                while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    ms.Write(buffer, 0, read);
                }
                return ms.ToArray();
            }
        }

     

    Step 4: Write GetDocument fumction to  get back the original file from byte array

     

     private void GetDocument(string fileName, byte[] fileContent)
        {
            try
            {
                //Split the string by character . to get file extension type
                string[] stringParts = fileName.Split(new char[] { '.' });
                string strType = stringParts[1];
                Response.Clear();
                Response.ClearContent();
                Response.ClearHeaders();
                Response.AddHeader("content-disposition", "attachment; filename=" + fileName.Replace(" ",""));
                //Set the content type as file extension type
                Response.ContentType = strType;
                //Write the file content
                this.Response.BinaryWrite(fileContent);
                this.Response.End();
            }
            catch (Exception ex)
            {
    
            }
        }

     

    Hope, this will help you!

     

     

     

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