C#實現文件與二進制互轉並存入數據庫

這篇文章主要介紹了C#實現文件與二進制互轉並存入數據庫,本文直接給出代碼實例,代碼中包含詳細註釋,須要的朋友能夠參考下

//這個方法是瀏覽文件對象

     private void button1_Click( object sender, EventArgs e)

     {

       //用戶打開文件瀏覽

       using (OpenFileDialog dialog = new OpenFileDialog())

       {

         //只能單選一個文件

         dialog.Multiselect = false ;

         //選擇一個文件

         if (dialog.ShowDialog() == DialogResult.OK)

         {

           try

           {

             //把選擇的文件路徑給txtPath

             this .textBox1.Text = dialog.FileName;

           }

           catch (Exception ex)

           {

             //拋出異常

             throw (ex);

           }

         }

       }

     }

 

     //關閉

     private void button3_Click( object sender, EventArgs e)

     {

       this .Close();

     }

 

     //把文件轉成二進制流出入數據庫

     private void button2_Click( object sender, EventArgs e)

     {

       FileStream fs = new FileStream(textBox1.Text, FileMode.Open);

       BinaryReader br = new BinaryReader(fs);

       Byte[] byData = br.ReadBytes(( int )fs.Length);

       fs.Close();

       string conn = "server=.;database=testDB;Uid=sa;Pwd=sa " ;

       SqlConnection myconn = new SqlConnection(conn);

       myconn.Open();

       string str = "insert into pro_table (pro_name,pro_file) values('測試文件',@file)" ;

       SqlCommand mycomm = new SqlCommand(str, myconn);

       mycomm.Parameters.Add( "@file" , SqlDbType.Binary, byData.Length);

       mycomm.Parameters[ "@file" ].Value = byData;

       mycomm.ExecuteNonQuery();

       myconn.Close();

     }

 

     //從數據庫中把二進制流讀出寫入還原成文件

     private void button4_Click( object sender, EventArgs e)

     {

       string conn = "server=.;database=testDB;Uid=sa;Pwd=sa " ;

       string str = "select pro_file from pro_table where pro_name='測試文件' " ;

       SqlConnection myconn = new SqlConnection(conn);

       SqlDataAdapter sda = new SqlDataAdapter(str, conn);

       DataSet myds = new DataSet();

       myconn.Open();

       sda.Fill(myds);

       myconn.Close();

       Byte[] Files = (Byte[])myds.Tables[0].Rows[0][ "pro_file" ];

       BinaryWriter bw = new BinaryWriter(File.Open( "D:\\2.rdlc" ,FileMode.OpenOrCreate));

       bw.Write(Files);

       bw.Close();

        

     }