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Como aplicar o padrão PropertyNameChanged

  • Artigo

O exemplo de código a seguir demonstra como aplicar o padrão PropertyNameChanged a um controle personalizado. Aplique esse padrão ao implementar controles personalizados que são usados com o mecanismo de vinculação de dados do Windows Forms.

Exemplo

// 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);
    }
}

' 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

Compilando o código

Para compilar o exemplo de código anterior:

  • Cole o código em um arquivo de código vazio. Você deve usar o controle personalizado em um formulário do Windows que contém um Main método.

Confira também