Procedura: garantire che la riga selezionata in una tabella figlio rimanga nella posizione correttaHow to: Ensure the Selected Row in a Child Table Remains at the Correct Position

Quando si usa il data binding in Windows Form, spesso i dati vengono mostrati in una visualizzazione denominata padre/figlio o master/dettagliOftentimes when you work with data binding in Windows Forms, you will display data in what is called a parent/child or master/details view. Si tratta di uno scenario di data binding in cui i dati provenienti dalla stessa origine vengono visualizzati in due controlli.This refers to a data-binding scenario where data from the same source is displayed in two controls. Se si modifica la selezione in un controllo, automaticamente vengono modificati anche i dati visualizzati nel secondo controllo.Changing the selection in one control causes the data displayed in the second control to change. Ad esempio, il primo controllo può contenere un elenco di clienti e il secondo un elenco di ordini correlati al cliente selezionato nel primo controllo.For example, the first control might contain a list of customers and the second a list of orders related to the selected customer in the first control.

A partire da .NET Framework versione 2.0, quando si visualizzano i dati in una visualizzazione padre/figlio può essere necessario effettuare alcuni passaggi aggiuntivi per assicurarsi che la riga attualmente selezionata nella tabella figlio non venga reimpostata sulla prima riga della tabella.Starting with the .NET Framework version 2.0, when you display data in a parent/child view you might have to take extra steps to make sure that the currently selected row in the child table is not reset to the first row of the table. A tale scopo, è necessario memorizzare nella cache la posizione della tabella figlio e reimpostarla dopo aver modificato la tabella padre.In order to do this, you will have to cache the child table position and reset it after the parent table changes. In genere, la tabella figlio viene reimpostata la prima volta che si modifica un campo in una riga della tabella padre.Typically the child reset occurs the first time a field in a row of the parent table changes.

Per memorizzare nella cache la posizione corrente della tabella figlioTo Cache the Current Child Position

  1. Dichiarare una variabile Integer per archiviare la posizione dell'elenco figlio e una variabile booleana per archiviare se memorizzare nella cache la posizione della tabella figlio.Declare an integer variable to store the child list position and a Boolean variable to store whether to cache the child position.

    private int cachedPosition = -1;
    private bool cacheChildPosition = true;
    
    Private cachedPosition As Integer = - 1
    Private cacheChildPosition As Boolean = True
    
    
  2. Gestire l'evento ListChanged per l'oggetto CurrencyManager del binding e individuare un oggetto ListChangedType di Reset.Handle the ListChanged event for the binding's CurrencyManager and check for a ListChangedType of Reset.

  3. Controllare la posizione corrente dell'oggetto CurrencyManager.Check the current position of the CurrencyManager. Se è maggiore del primo elemento dell'elenco, in genere 0, salvarlo in una variabile.If it is greater than first entry in the list (typically 0), save it to a variable.

    void relatedCM_ListChanged(object sender, ListChangedEventArgs e)
    {
        // Check to see if this is a caching situation.
        if (cacheChildPosition && cachePositionCheckBox.Checked) 
        {
            // If so, check to see if it is a reset situation, and the current
            // position is greater than zero.
            CurrencyManager relatedCM = sender as CurrencyManager;
            if (e.ListChangedType == ListChangedType.Reset && relatedCM.Position > 0)
    
                // If so, cache the position of the child table.
                cachedPosition = relatedCM.Position;
        }
    }
    
    Private Sub relatedCM_ListChanged(ByVal sender As Object, _
        ByVal e As ListChangedEventArgs)
        ' Check to see if this is a caching situation.
        If cacheChildPosition AndAlso cachePositionCheckBox.Checked Then
            ' If so, check to see if it is a reset situation, and the current
            ' position is greater than zero.
            Dim relatedCM As CurrencyManager = sender
            If e.ListChangedType = ListChangedType.Reset _
                AndAlso relatedCM.Position > 0 Then
    
                ' If so, cache the position of the child table.
                cachedPosition = relatedCM.Position
            End If
        End If
    
    End Sub
    
  4. Gestire l'evento CurrentChanged dell'elenco padre per l'oggetto CurrencyManager padre.Handle the parent list's CurrentChanged event for the parent currency manager. Nel gestore impostare il valore booleano per indicare che non si tratta di uno scenario di memorizzazione nella cache.In the handler, set the Boolean value to indicate it is not a caching scenario. Se si verifica l'evento CurrentChanged, la modifica all'elemento padre sarà una modifica alla posizione dell'elenco e non una modifica al valore dell'elemento.If the CurrentChanged occurs, the change to the parent is a list position change and not an item value change.

    void bindingSource1_CurrentChanged(object sender, EventArgs e)
    {
        // If the CurrentChanged event occurs, this is not a caching 
        // situation.
        cacheChildPosition = false;
    }
    
    ' Handle the current changed event. This event occurs when
    ' the current item is changed, but not when a field of the current
    ' item is changed.
    Private Sub bindingSource1_CurrentChanged(ByVal sender As Object, _
        ByVal e As EventArgs) Handles bindingSource1.CurrentChanged
        ' If the CurrentChanged event occurs, this is not a caching 
        ' situation.
        cacheChildPosition = False
    
    End Sub
    

Per reimpostare la posizione dell'elemento figlioTo Reset the Child Position

  1. Gestire l'evento PositionChanged per l'oggetto CurrencyManager del binding figlio.Handle the PositionChanged event for the child binding's CurrencyManager.

  2. Reimpostare la posizione della tabella figlio sulla posizione memorizzata nella cache salvata nella procedura precedente.Reset the child table position to the cached position saved in the previous procedure.

    void relatedCM_PositionChanged(object sender, EventArgs e)
    {
        // Check to see if this is a caching situation.
        if (cacheChildPosition && cachePositionCheckBox.Checked)
        {
            CurrencyManager relatedCM = sender as CurrencyManager;
    
            // If so, check to see if the current position is 
            // not equal to the cached position and the cached 
            // position is not out of bounds.
            if (relatedCM.Position != cachedPosition && cachedPosition
                > 0 && cachedPosition < relatedCM.Count)
            {
                relatedCM.Position = cachedPosition;
                cachedPosition = -1;
            }
        }
    }
    
    Private Sub relatedCM_PositionChanged(ByVal sender As Object, ByVal e As EventArgs) 
        ' Check to see if this is a caching situation.
        If cacheChildPosition AndAlso cachePositionCheckBox.Checked Then
            Dim relatedCM As CurrencyManager = sender
            
            ' If so, check to see if the current position is 
            ' not equal to the cached position and the cached 
            ' position is not out of bounds.
            If relatedCM.Position <> cachedPosition AndAlso _
                cachedPosition > 0 AndAlso cachedPosition < _
                relatedCM.Count Then
                relatedCM.Position = cachedPosition
                cachedPosition = -1
            End If
        End If
    End Sub
    

EsempioExample

L'esempio seguente illustra come salvare la posizione corrente nell'oggetto CurrencyManager per una tabella figlio e reimpostare la posizione dopo aver effettuato una modifica nella tabella padre.The following example demonstrates how to save the current position on the CurrencyManager.for a child table and reset the position after an edit is completed on the parent table. In questo esempio sono presenti due controlli DataGridView associati a due tabelle in un oggetto DataSet mediante un componente BindingSource.This example contains two DataGridView controls bound to two tables in a DataSet using a BindingSource component. Tra le due tabelle viene stabilita una relazione, che viene aggiunta all'oggetto DataSet.A relation is established between the two tables and the relation is added to the DataSet. La posizione nella tabella figlio viene impostata inizialmente sulla terza riga a mero scopo esemplificativo.The position in the child table is initially set to the third row for demonstration purposes.

using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BT2
{
    public class Form1 : Form
    {
        public Form1()
        {
            InitializeControlsAndDataSource();
        }

        // Declare the controls to be used.
        private BindingSource bindingSource1;
        private DataGridView dataGridView1;
        private Button button1;
        private DataGridView dataGridView2;
        private CheckBox cachePositionCheckBox;
        public DataSet set1;
       
        private void InitializeControlsAndDataSource()
        {
            // Initialize the controls and set location, size and 
            // other basic properties.
            this.dataGridView1 = new DataGridView();
            this.bindingSource1 = new BindingSource();
            this.button1 = new Button();
            this.dataGridView2 = new DataGridView();
            this.cachePositionCheckBox = new System.Windows.Forms.CheckBox();
            this.dataGridView1.ColumnHeadersHeightSizeMode =
                DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Dock = DockStyle.Top;
            this.dataGridView1.Location = new Point(0, 20);
            this.dataGridView1.Size = new Size(292, 170);
            this.button1.Location = new System.Drawing.Point(18, 175);
            this.button1.Size = new System.Drawing.Size(125, 23);
        
            button1.Text = "Clear Parent Field";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            this.dataGridView2.ColumnHeadersHeightSizeMode = 
                System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView2.Location = new System.Drawing.Point(0, 225);
            this.dataGridView2.Size = new System.Drawing.Size(309, 130);
            this.cachePositionCheckBox.AutoSize = true;
            this.cachePositionCheckBox.Checked = true;
            this.cachePositionCheckBox.Location = new System.Drawing.Point(150, 175);
            this.cachePositionCheckBox.Name = "radioButton1";
            this.cachePositionCheckBox.Size = new System.Drawing.Size(151, 17);
            this.cachePositionCheckBox.Text = "Cache and restore position";
            this.ClientSize = new System.Drawing.Size(325, 420);
            this.Controls.Add(this.dataGridView1);
            this.Controls.Add(this.cachePositionCheckBox);
            this.Controls.Add(this.dataGridView2);
            this.Controls.Add(this.button1);
          
            // Initialize the data.
            set1 = InitializeDataSet();
           
            // Set the data source to the DataSet.
            bindingSource1.DataSource = set1;
           
            //Set the DataMember to the Menu table.
            bindingSource1.DataMember = "Customers";

            // Add the control data bindings.
            dataGridView1.DataSource = bindingSource1;

            // Set the data source and member for the second DataGridView.
            dataGridView2.DataSource = bindingSource1;
            dataGridView2.DataMember = "custOrders";

            // Get the currency manager for the customer orders binding.
            CurrencyManager relatedCM = 
                bindingSource1.GetRelatedCurrencyManager("custOrders");
            
            // Set the position in the child table for demonstration purposes.
            relatedCM.Position = 3;

            // Handle the current changed event. This event occurs when
            // the current item is changed, but not when a field of the current
            // item is changed.
            bindingSource1.CurrentChanged += 
                new EventHandler(bindingSource1_CurrentChanged);
            
            // Handle the two events for caching and resetting the position.
            relatedCM.ListChanged += new ListChangedEventHandler(relatedCM_ListChanged);
            relatedCM.PositionChanged
                += new EventHandler(relatedCM_PositionChanged);

            // Set cacheing to true in case current changed event
            // occured on set up.
            cacheChildPosition = true;
        }

      
        // Establish the data set with two tables and a relationship
        // between them.
        private DataSet InitializeDataSet()
        {
            set1 = new DataSet();
            // Declare the DataSet and add a table and column.
            set1.Tables.Add("Customers");
            set1.Tables[0].Columns.Add("CustomerID");
            set1.Tables[0].Columns.Add("Customer Name");
            set1.Tables[0].Columns.Add("Contact Name");

            // Add some rows to the table.
            set1.Tables["Customers"].Rows.Add("c1", "Fabrikam, Inc.", "Ellen Adams");
            set1.Tables[0].Rows.Add("c2", "Lucerne Publishing", "Don Hall");
            set1.Tables[0].Rows.Add("c3", "Northwind Traders", "Lori Penor");
            set1.Tables[0].Rows.Add("c4", "Tailspin Toys", "Michael Patten");
            set1.Tables[0].Rows.Add("c5", "Woodgrove Bank", "Jyothi Pai");

            // Declare the DataSet and add a table and column.
            set1.Tables.Add("Orders");
            set1.Tables[1].Columns.Add("CustomerID");
            set1.Tables[1].Columns.Add("OrderNo");
            set1.Tables[1].Columns.Add("OrderDate");

            // Add some rows to the table.
            set1.Tables[1].Rows.Add("c1", "119", "10/04/2006");
            set1.Tables[1].Rows.Add("c1", "149", "10/10/2006");
            set1.Tables[1].Rows.Add("c1", "159", "10/12/2006");
            set1.Tables[1].Rows.Add("c2", "169", "10/10/2006");
            set1.Tables[1].Rows.Add("c2", "179", "10/10/2006");
            set1.Tables[1].Rows.Add("c2", "189", "10/12/2006");
            set1.Tables[1].Rows.Add("c3", "122", "10/04/2006");
            set1.Tables[1].Rows.Add("c4", "130", "10/10/2006");
            set1.Tables[1].Rows.Add("c5", "1.29", "10/14/2006");

            DataRelation dr = new DataRelation("custOrders",
                set1.Tables["Customers"].Columns["CustomerID"],
                set1.Tables["Orders"].Columns["CustomerID"]);
            set1.Relations.Add(dr);
            return set1;
        }
        private int cachedPosition = -1;
        private bool cacheChildPosition = true;

        void relatedCM_ListChanged(object sender, ListChangedEventArgs e)
        {
            // Check to see if this is a caching situation.
            if (cacheChildPosition && cachePositionCheckBox.Checked) 
            {
                // If so, check to see if it is a reset situation, and the current
                // position is greater than zero.
                CurrencyManager relatedCM = sender as CurrencyManager;
                if (e.ListChangedType == ListChangedType.Reset && relatedCM.Position > 0)

                    // If so, cache the position of the child table.
                    cachedPosition = relatedCM.Position;
            }
        }
        void bindingSource1_CurrentChanged(object sender, EventArgs e)
        {
            // If the CurrentChanged event occurs, this is not a caching 
            // situation.
            cacheChildPosition = false;
        }
        void relatedCM_PositionChanged(object sender, EventArgs e)
        {
            // Check to see if this is a caching situation.
            if (cacheChildPosition && cachePositionCheckBox.Checked)
            {
                CurrencyManager relatedCM = sender as CurrencyManager;

                // If so, check to see if the current position is 
                // not equal to the cached position and the cached 
                // position is not out of bounds.
                if (relatedCM.Position != cachedPosition && cachedPosition
                    > 0 && cachedPosition < relatedCM.Count)
                {
                    relatedCM.Position = cachedPosition;
                    cachedPosition = -1;
                }
            }
        }
        int count = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            // For demo purposes--modifies a value in the first row of the
            // parent table.
            DataRow row1 = set1.Tables[0].Rows[0];
            row1[1] = DBNull.Value;

        }
        
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }

    
}
Imports System
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms



Public Class Form1
    Inherits Form
    
    Public Sub New() 
        InitializeControlsAndDataSource()
    
    End Sub
    
    ' Declare the controls to be used.
    Private WithEvents bindingSource1 As BindingSource
    Private dataGridView1 As DataGridView
    Private WithEvents button1 As Button
    Private dataGridView2 As DataGridView
    Private cachePositionCheckBox As CheckBox
    Public set1 As DataSet
    
    
    Private Sub InitializeControlsAndDataSource() 
        ' Initialize the controls and set location, size and 
        ' other basic properties.
        Me.dataGridView1 = New DataGridView()
        Me.bindingSource1 = New BindingSource()
        Me.button1 = New Button()
        Me.dataGridView2 = New DataGridView()
        Me.cachePositionCheckBox = New System.Windows.Forms.CheckBox()
        Me.dataGridView1.ColumnHeadersHeightSizeMode = _
            DataGridViewColumnHeadersHeightSizeMode.AutoSize
        Me.dataGridView1.Dock = DockStyle.Top
        Me.dataGridView1.Location = New Point(0, 20)
        Me.dataGridView1.Size = New Size(292, 170)
        Me.button1.Location = New System.Drawing.Point(18, 175)
        Me.button1.Size = New System.Drawing.Size(125, 23)
        
        button1.Text = "Clear Parent Field"

        Me.dataGridView2.ColumnHeadersHeightSizeMode = _
            System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize
        Me.dataGridView2.Location = New System.Drawing.Point(0, 225)
        Me.dataGridView2.Size = New System.Drawing.Size(309, 130)
        Me.cachePositionCheckBox.AutoSize = True
        Me.cachePositionCheckBox.Checked = True
        Me.cachePositionCheckBox.Location = New System.Drawing.Point(150, 175)
        Me.cachePositionCheckBox.Name = "radioButton1"
        Me.cachePositionCheckBox.Size = New System.Drawing.Size(151, 17)
        Me.cachePositionCheckBox.Text = "Cache and restore position"
        Me.ClientSize = New System.Drawing.Size(325, 420)
        Me.Controls.Add(Me.dataGridView1)
        Me.Controls.Add(Me.cachePositionCheckBox)
        Me.Controls.Add(Me.dataGridView2)
        Me.Controls.Add(Me.button1)
        
        ' Initialize the data.
        set1 = InitializeDataSet()
        
        ' Set the data source to the DataSet.
        bindingSource1.DataSource = set1
        
        'Set the DataMember to the Menu table.
        bindingSource1.DataMember = "Customers"
        
        ' Add the control data bindings.
        dataGridView1.DataSource = bindingSource1
        
        ' Set the data source and member for the second DataGridView.
        dataGridView2.DataSource = bindingSource1
        dataGridView2.DataMember = "custOrders"
        
        ' Get the currency manager for the customer orders binding.
        Dim relatedCM As CurrencyManager = _
            bindingSource1.GetRelatedCurrencyManager("custOrders")

        ' Handle the two events for caching and resetting the position.
        AddHandler relatedCM.ListChanged, AddressOf relatedCM_ListChanged
        AddHandler relatedCM.PositionChanged, AddressOf relatedCM_PositionChanged
        
        ' Set the position in the child table for demonstration purposes.
        relatedCM.Position = 3

        ' Set cacheing to true in case current changed event
        ' occured on set up.
        cacheChildPosition = True
      
    
    End Sub 'InitializeControlsAndDataSource
    
    
    
    ' Establish the data set with two tables and a relationship
    ' between them.
    Private Function InitializeDataSet() As DataSet 
        set1 = New DataSet()
        ' Declare the DataSet and add a table and column.
        set1.Tables.Add("Customers")
        set1.Tables(0).Columns.Add("CustomerID")
        set1.Tables(0).Columns.Add("Customer Name")
        set1.Tables(0).Columns.Add("Contact Name")
        
        ' Add some rows to the table.
        set1.Tables("Customers").Rows.Add("c1", "Fabrikam, Inc.", _
            "Ellen Adams")
        set1.Tables(0).Rows.Add("c2", "Lucerne Publishing", "Don Hall")
        set1.Tables(0).Rows.Add("c3", "Northwind Traders", "Lori Penor")
        set1.Tables(0).Rows.Add("c4", "Tailspin Toys", "Michael Patten")
        set1.Tables(0).Rows.Add("c5", "Woodgrove Bank", "Jyothi Pai")
        
        ' Declare the DataSet and add a table and column.
        set1.Tables.Add("Orders")
        set1.Tables(1).Columns.Add("CustomerID")
        set1.Tables(1).Columns.Add("OrderNo")
        set1.Tables(1).Columns.Add("OrderDate")
        
        ' Add some rows to the table.
        set1.Tables(1).Rows.Add("c1", "119", "10/04/2006")
        set1.Tables(1).Rows.Add("c1", "149", "10/10/2006")
        set1.Tables(1).Rows.Add("c1", "159", "10/12/2006")
        set1.Tables(1).Rows.Add("c2", "169", "10/10/2006")
        set1.Tables(1).Rows.Add("c2", "179", "10/10/2006")
        set1.Tables(1).Rows.Add("c2", "189", "10/12/2006")
        set1.Tables(1).Rows.Add("c3", "122", "10/04/2006")
        set1.Tables(1).Rows.Add("c4", "130", "10/10/2006")
        set1.Tables(1).Rows.Add("c5", "1.29", "10/14/2006")
        
        Dim dr As New DataRelation("custOrders", _
            set1.Tables("Customers").Columns("CustomerID"), _
            set1.Tables("Orders").Columns("CustomerID"))
        set1.Relations.Add(dr)
        Return set1
    
    End Function '
    Private cachedPosition As Integer = - 1
    Private cacheChildPosition As Boolean = True
    
    Private Sub relatedCM_ListChanged(ByVal sender As Object, _
        ByVal e As ListChangedEventArgs)
        ' Check to see if this is a caching situation.
        If cacheChildPosition AndAlso cachePositionCheckBox.Checked Then
            ' If so, check to see if it is a reset situation, and the current
            ' position is greater than zero.
            Dim relatedCM As CurrencyManager = sender
            If e.ListChangedType = ListChangedType.Reset _
                AndAlso relatedCM.Position > 0 Then

                ' If so, cache the position of the child table.
                cachedPosition = relatedCM.Position
            End If
        End If

    End Sub

    ' Handle the current changed event. This event occurs when
    ' the current item is changed, but not when a field of the current
    ' item is changed.
    Private Sub bindingSource1_CurrentChanged(ByVal sender As Object, _
        ByVal e As EventArgs) Handles bindingSource1.CurrentChanged
        ' If the CurrentChanged event occurs, this is not a caching 
        ' situation.
        cacheChildPosition = False

    End Sub

    Private Sub relatedCM_PositionChanged(ByVal sender As Object, ByVal e As EventArgs) 
        ' Check to see if this is a caching situation.
        If cacheChildPosition AndAlso cachePositionCheckBox.Checked Then
            Dim relatedCM As CurrencyManager = sender
            
            ' If so, check to see if the current position is 
            ' not equal to the cached position and the cached 
            ' position is not out of bounds.
            If relatedCM.Position <> cachedPosition AndAlso _
                cachedPosition > 0 AndAlso cachedPosition < _
                relatedCM.Count Then
                relatedCM.Position = cachedPosition
                cachedPosition = -1
            End If
        End If
    End Sub

    Private count As Integer = 0
    
    Private Sub button1_Click(ByVal sender As Object, _
        ByVal e As EventArgs) Handles button1.Click
        ' For demo purposes--modifies a value in the first row of the
        ' parent table.
        Dim row1 As DataRow = set1.Tables(0).Rows(0)
        row1(1) = DBNull.Value
    End Sub
     
    <STAThread()>  _
    Shared Sub Main() 
        Application.EnableVisualStyles()
        Application.SetCompatibleTextRenderingDefault(False)
        Application.Run(New Form1())
    
    End Sub
End Class

Per testare l'esempio di codice, eseguire la procedura seguente:To test the code example, perform the following steps:

  1. Eseguire l'esempio.Run the example.

  2. Verificare che la casella di controllo Memorizza nella cache e reimposta posizione sia selezionata.Make sure the Cache and reset position check box is selected.

  3. Fare clic sul pulsante Cancella campo padre per provocare una modifica in un campo della tabella padre.Click the Clear parent field button to cause a change in a field of the parent table. Notare che la riga selezionata nella tabella figlio non cambia.Notice that the selected row in the child table does not change.

  4. Chiudere ed eseguire nuovamente l'esempio.Close and run the example again. È necessario eseguire questa procedura perché la reimpostazione si verifica solo in seguito alla prima modifica nella riga padre.You need to do this because the reset behavior occurs only on the first change in the parent row.

  5. Deselezionare la casella di controllo Memorizza nella cache e reimposta posizione.Clear the Cache and reset position check box.

  6. Fare clic sul pulsante Cancella campo padre.Click the Clear parent field button. Notare che la riga selezionata nella tabella figlio diventa la prima riga.Notice that the selected row in the child table changes to the first row.

Compilazione del codiceCompiling the Code

L'esempio presenta i requisiti seguenti:This example requires:

  • Riferimenti agli assembly System, System.Data, System.Drawing, System.Windows.Forms e System.XML.References to the System, System.Data, System.Drawing, System.Windows.Forms, and System.XML assemblies.

Per informazioni su come compilare questo esempio dalla riga di comando per Visual Basic o Visual c#, vedere compilazione dalla riga di comando oppure compilazione da riga di comando con csc.exe.For information about how to build this example from the command line for Visual Basic or Visual C#, see Building from the Command Line or Command-line Building With csc.exe. È anche possibile compilare questo esempio in Visual Studio incollando il codice in un nuovo progetto.You can also build this example in Visual Studio by pasting the code into a new project. Vedere anche Procedura: Compilare ed eseguire un esempio di codice Windows Form completo con Visual Studio.Also see How to: Compile and Run a Complete Windows Forms Code Example Using Visual Studio.

Vedere ancheSee Also

Procedura: Garantire la sincronizzazione di più controlli associati alla stessa origine datiHow to: Ensure Multiple Controls Bound to the Same Data Source Remain Synchronized
Componente BindingSourceBindingSource Component
Data binding e Windows FormsData Binding and Windows Forms