Aktualisieren von Datenbanktabelle von Datagridview in C#

Question

ich meine Datenbank Zeilen aus den DataGridView mit diesem Code zu aktualisieren bin versucht zu:

private void button2_Click(object sender, EventArgs e) 
{ 
    foreach (GridViewRow dr in dataGridView1.Rows) 
    { 
     string constring = "Data Source = localhost; port = 3306; username = root; password = 0159"; 
     string Query = "Update TopShineDB.Table1 set Time = '" + dr.Cells[0].Text + "', CarColorNumber = '" + dr.Cells[1].Text + "', Interior = '" + dr.Cells[2].Text + "', Exterior = '" + dr.Cells[3].Text + "', CPlastic = '" + dr.Cells[4].Text + "', MPlastic = '" + dr.Cells[5].Text + "', SPlastic = '" + dr.Cells[6].Text + "', PlasticB = '" + dr.Cells[7].Text + "', WashExt = '" + dr.Cells[8].Text + "', WashEng = '" + dr.Cells[9].Text + "', WashTrunk = '" + dr.Cells[10].Text + "', WashSeats = '" + dr.Cells[11].Text + "', SeatsRmv = '" + dr.Cells[12].Text + "', SeatsFit = '" + dr.Cells[13].Text + "', Notes = '" + dr.Cells[14].Text + "', where Time = '" + dr.Cells[0].Text + "' ;"; 
     MySqlConnection conn = new MySqlConnection(constring); 
     MySqlCommand command = new MySqlCommand(Query, conn); 
     MySqlDataReader myReader; 

     try 
     { 
      conn.Open(); 
      myReader = command.ExecuteReader(); 
      MessageBox.Show("Table Successfully Updated"); 
      while (myReader.Read()) 
      { 

      } 
     } 
     catch (Exception ex) 
     { 
       MessageBox.Show(ex.Message); 
     } 
    } 
} 

Aber ich am Ende diesen Fehler:

{"Unable to cast object of type 'System.Windows.Forms.DataGridViewRow' to type 'System.Web.UI.WebControls.GridViewRow'."} 

Answer 1

Es ist foreach (DataGridViewRow ... nicht foreach (GridViewRow ... Wie in msdn documentation .Rows Eigenschaft:

Gets an array of DataGridViewRow objects.

für Code Um diese Änderung zu kompilieren, müssen Sie .Wert statt .Text verwenden, wenn Sie Zellen Werte

Answer 2

Sie tun DataReader und versucht zu aktualisieren. Um zu aktualisieren, müssen Sie nonQuery ausführen. Also statt:

myReader = command.ExecuteReader(); 

Sie benötigen

cmd.ExecuteNonQuery(); 

Hier ist, wie Sie Ihren Code unter foreach-Schleife Notwendigkeit, sieht aus wie

string constring = "Data Source = localhost; port = 3306; username = root; password = 0159"; 
string Query = "Update TopShineDB.Table1 set Time = '" + dr.Cells[0].Text + "', CarColorNumber = '" + dr.Cells[1].Text + "', Interior = '" + dr.Cells[2].Text + "', Exterior = '" + dr.Cells[3].Text + "', CPlastic = '" + dr.Cells[4].Text + "', MPlastic = '" + dr.Cells[5].Text + "', SPlastic = '" + dr.Cells[6].Text + "', PlasticB = '" + dr.Cells[7].Text + "', WashExt = '" + dr.Cells[8].Text + "', WashEng = '" + dr.Cells[9].Text + "', WashTrunk = '" + dr.Cells[10].Text + "', WashSeats = '" + dr.Cells[11].Text + "', SeatsRmv = '" + dr.Cells[12].Text + "', SeatsFit = '" + dr.Cells[13].Text + "', Notes = '" + dr.Cells[14].Text + "', where Time = '" + dr.Cells[0].Text + "' ;"; 
MySqlConnection conn = new MySqlConnection(constring); 
MySqlCommand command = new MySqlCommand(Query, conn); 
            try 
         { 
          con.Open(); 
          command.ExecuteNonQuery(); 
          con.Close(); 
         } 

         catch (Exception ex) 
         { 
          MessageBox.Show(ex.ToString()); 
         }