Gewusst wie: Anwenden des PropertyNameChanged-Musters

Im folgenden Codebeispiel wird veranschaulicht, wie das PropertyNameChanged-Muster auf ein benutzerdefiniertes Steuerelement angewendet wird. Wenden Sie dieses Muster an, wenn Sie benutzerdefinierte Steuerelemente implementieren, die mit dem Windows Forms-Datenbindungsmodul verwendet werden.

Beispiel

' This class implements a simple user control 
' that demonstrates how to apply the propertyNameChanged pattern.
<ComplexBindingProperties("DataSource", "DataMember")>  _
Public Class CustomerControl
    Inherits UserControl
    Private dataGridView1 As DataGridView
    Private label1 As Label
    Private lastUpdate As DateTime = DateTime.Now

    Public DataSourceChanged As EventHandler


    Public Property DataSource() As Object 
        Get
            Return Me.dataGridView1.DataSource
        End Get
        Set
            If DataSource IsNot Value Then
                Me.dataGridView1.DataSource = Value
                OnDataSourceChanged()
            End If
        End Set
    End Property


    Public Property DataMember() As String 
        Get
            Return Me.dataGridView1.DataMember
        End Get 
        Set
            Me.dataGridView1.DataMember = value
        End Set 
    End Property


    Private Sub OnDataSourceChanged() 
        If (DataSourceChanged IsNot Nothing) Then
            DataSourceChanged(Me, New EventArgs())
        End If

    End Sub


    Public Sub New() 
        Me.dataGridView1 = New System.Windows.Forms.DataGridView()
        Me.label1 = New System.Windows.Forms.Label()
        Me.dataGridView1.ColumnHeadersHeightSizeMode = _
           System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize
        Me.dataGridView1.ImeMode = System.Windows.Forms.ImeMode.Disable
        Me.dataGridView1.Location = New System.Drawing.Point(19, 55)
        Me.dataGridView1.Size = New System.Drawing.Size(350, 150)
        Me.dataGridView1.TabIndex = 1
        Me.label1.AutoSize = True
        Me.label1.Location = New System.Drawing.Point(19, 23)
        Me.label1.Name = "label1"
        Me.label1.Size = New System.Drawing.Size(76, 13)
        Me.label1.TabIndex = 2
        Me.label1.Text = "Customer List:"
        Me.Controls.Add(Me.label1)
        Me.Controls.Add(Me.dataGridView1)
        Me.Size = New System.Drawing.Size(350, 216)
    End Sub
End Class

// This class implements a simple user control 
// that demonstrates how to apply the propertyNameChanged pattern.
[ComplexBindingProperties("DataSource", "DataMember")]
public class CustomerControl : UserControl
{
    private DataGridView dataGridView1;
    private Label label1;
    private DateTime lastUpdate = DateTime.Now;

    public EventHandler DataSourceChanged;

    public object DataSource
    {
        get
        {
            return this.dataGridView1.DataSource;
        }
        set
        {
            if (DataSource != value)
            {
                this.dataGridView1.DataSource = value;
                OnDataSourceChanged();
            }
        }
    }

    public string DataMember
    {
        get { return this.dataGridView1.DataMember; }

        set { this.dataGridView1.DataMember = value; }

    }

    private void OnDataSourceChanged()
    {
        if (DataSourceChanged != null)
        {
            DataSourceChanged(this, new EventArgs());
        }
    }

    public CustomerControl()
    {
        this.dataGridView1 = new System.Windows.Forms.DataGridView();
        this.label1 = new System.Windows.Forms.Label();
        this.dataGridView1.ColumnHeadersHeightSizeMode = 
            System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
        this.dataGridView1.ImeMode = System.Windows.Forms.ImeMode.Disable;
        this.dataGridView1.Location = new System.Drawing.Point(19, 55);
        this.dataGridView1.Size = new System.Drawing.Size(350, 150);
        this.dataGridView1.TabIndex = 1;
        this.label1.AutoSize = true;
        this.label1.Location = new System.Drawing.Point(19, 23);
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size(76, 13);
        this.label1.TabIndex = 2;
        this.label1.Text = "Customer List:";
        this.Controls.Add(this.label1);
        this.Controls.Add(this.dataGridView1);
        this.Size = new System.Drawing.Size(350, 216);

    }
}

Kompilieren des Codes

So kompilieren Sie das vorherige Codebeispiel:

• Fügen Sie den Code in eine leere Codedatei ein. Sie müssen das benutzerdefinierte Steuerelement in einem Windows Form verwenden, das eine Main-Methode enthält.

Siehe auch

Aufgaben

Gewusst wie: Implementieren der INotifyPropertyChanged-Schnittstelle

Konzepte

Änderungsbenachrichtigung in der Windows Forms-Datenbindung

Weitere Ressourcen

Datenbindung in Web Forms