如何使用网络服务从 gridview 和 SQL 中删除一行？

Question

I want to be able to delete a row from a gridview when I click on a delete button. But for some reason, the code only deletes the rows from the gridview but not the from the SQL DataBase.

It's because i'm not using the web method eliminarTarea correctly?

What am I doing wrong? Many Thanks!

button method

            try
            {
                if (MessageBox.Show("¿Está seguro de querer eliminar esta nota?","Message",MessageBoxButtons.YesNo,MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    int rows = DataGVTareas.RowCount;
                    for(int i = rows - 1; i >= 0; i--)
                    {
                        if (DataGVTareas.Rows[i].Selected) 
                        {
                            ServiceMantenedorCliente.WebServiceMantenedorClienteSoapClient auxNegocio = new ServiceMantenedorCliente.WebServiceMantenedorClienteSoapClient();
                            auxNegocio.webEliminarTarea(titulotareasDataGridViewTextBoxColumn.ToString());
                            tareasBindingSource.RemoveAt(DataGVTareas.Rows[i].Index);
                        }
                    }
                     

                    
                }
                //ServiceMantenedorCliente.WebServiceMantenedorClienteSoapClient auxNegocio = new ServiceMantenedorCliente.WebServiceMantenedorClienteSoapClient();
                if (String.IsNullOrEmpty(this.DataGVTareas.ToString()))
                {
                    MessageBox.Show("No hay datos por eliminar ", "NoteIt", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                }
                else
                {
                    //auxNegocio.webEliminarCliente(DataGVTareas.Rows[i]);
                    
                    MessageBox.Show("Los datos han sido eliminados", "NoteIt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    
                }
            }

            catch (Exception ex)
            {
                MessageBox.Show("Se ha producido un error inesperado, por favor reinicie la aplicación e intente nuevamente" + ex.Message, "NoteIt", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

app code

        public void eliminarTarea(String titulo_tareas)
        {
            this.ConexionTareas();
            this.Conec1.CadenaSQL = "DELETE FROM " + this.Conec1.NombreTabla
                                    + " WHERE titulo_tareas = '" + titulo_tareas + "';";
            this.Conec1.EsSelect = false;
            this.Conec1.Conectar();
        }

webservice method

        [WebMethod]
        public void webEliminarTarea(String titulo_tareas)
        {
            NegocioNotas auxNegocio = new NegocioNotas();
            auxNegocio.eliminarCliente(titulo_tareas);
        }

Answer 1

I don't read spanish so I hope I get the gist of how your controls are wired up... where do you call the .EndEdit() for the BindingSource which actually writes back to the database?

Also, as @Larnu mentioned, fix your SQL query:

public void eliminarTarea(String titulo_tareas)
{
    this.ConexionTareas();

    //You'll have to fix this up because I don't know what "Conec1" is.
    //This demonstrates putting your text values into a parameter instead
    //of string concatenation.
    //Concatenation of NombreTabla is also a vulnerability but I don't know how to fix that one 
    //because it is a table name and I don't know where NobreTabla is sourced from.
    string sqlTxt = "DELETE FROM " + this.Conec1.NombreTabla
        + " WHERE titulo_tareas = @TituloTareas;";
    SqlCommand cmd = new SqlCommand([sqlConnection here], sqlTxt);
    cmd.Parameters.AddWithValue("@TituloTareas", titulo_tareas);
    this.Conec1.SqlCommand = cmd;  //Does this even work with Conec1?

    this.Conec1.EsSelect = false;
    this.Conec1.Conectar();
}