如何使用网络服务从 gridview 和 SQL 中删除一行？

Question

当我单击删除按钮时，我希望能够从 gridview 中删除一行。 但出于某种原因，该代码仅删除 gridview 中的行，而不是 SQL 数据库中的行。

这是因为我没有正确使用 web 方法 eliminarTarea？

我究竟做错了什么？ 非常感谢！

按钮方式

            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);
            }

应用代码

        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();
        }

网络服务方法

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

Answer 1

我不读西班牙语，所以我希望我能了解您的控件是如何连接的要点...您在哪里调用BindingSource的.EndEdit()实际写回数据库？

另外，正如@Larnu 提到的，修复您的 SQL 查询：

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();
}