View.Activate Kejadian

Referensi

Definisi

Ruang nama:: System.Web.UI.WebControls

Rakitan:: System.Web.dll

Penting

Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.

Terjadi ketika kontrol saat ini View menjadi tampilan aktif.

public:
 event EventHandler ^ Activate;

public event EventHandler Activate;

member this.Activate : EventHandler

Public Custom Event Activate As EventHandler

Jenis Acara

EventHandler

Contoh

Contoh kode berikut menunjukkan cara menentukan dan mengkodekan penanganan aktivitas untuk Activate peristiwa View kontrol. Saat tampilan aktif berubah, pesan ditampilkan kepada pengguna yang menentukan View kontrol yang menaikkan Activate peristiwa dan View kontrol yang memunculkan Deactivate peristiwa.


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>View.Activate Event Example</title>

    <script runat="server">

        protected void Index_Changed(object sender, EventArgs e)
        {
            // Set the active view to
            // the view selected by the user.
            String str = ViewListBox.SelectedItem.Text;
            switch (str)
            {
                case "DefaultView":
                    MultiView1.SetActiveView(DefaultView);
                    break;
                case "NewsView":
                    MultiView1.SetActiveView(NewsView);
                    break;
                case "ShoppingView":
                    MultiView1.SetActiveView(ShoppingView);
                    break;
            }
        }

        // The handler for the DefaultView's Activate event.
        protected void DefaultView_Activate(object sender, EventArgs e)
        {
            // Notify the user that the event was raised.
            ActivateLabel.Text = "The Activate event was raised for the DefaultView.";
        }

        // The handler for the DefaultView's Deactivate event.
        protected void DefaultView_Deactivate(object sender, EventArgs e)
        {
            // Notify the user that the event was raised.
            DeactivateLabel.Text = "The Deactivate event was raised for the DefaultView.";
        }

        // The handler for the ShoppingView's Activate event.
        protected void ShoppingView_Activate(object sender, EventArgs e)
        {
            // Notify the user that the event was raised.
            ActivateLabel.Text = "The Activate event was raised for the ShoppingView.";
        }

        // The handler for the ShoppingView's Deactivate event.
        protected void ShoppingView_Deactivate(object sender, EventArgs e)
        {
            // Notify the user that the event was raised.
            DeactivateLabel.Text = "The Deactivate event was raised for the ShoppingView.";
        }

        // The handler for the NewsView's Activate event.
        protected void NewsView_Activate(object sender, EventArgs e)
        {
            // Notify the user that the event was raised.
            ActivateLabel.Text = "The Activate event was raised for the NewsView.";
        }
        // The handler for the NewsView's Deactivate event.
        protected void NewsView_Deactivate(object sender, EventArgs e)
        {
            // Notify the user that the event was raised.
            DeactivateLabel.Text = "The Deactivate event was raised for the NewsView.";
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                MultiView1.SetActiveView(DefaultView);
            }
        }
    </script>

</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            View Activate and Deactivate Events Example</h3>
        <h4>
            Select a view to display in a MultiView control:</h4>
        <asp:ListBox ID="ViewListBox" Rows="1" SelectionMode="Single" AutoPostBack="True"
            OnSelectedIndexChanged="Index_Changed" runat="Server">
            <asp:ListItem Value="0">DefaultView</asp:ListItem>
            <asp:ListItem Value="1">NewsView</asp:ListItem>
            <asp:ListItem Value="2">ShoppingView</asp:ListItem>
        </asp:ListBox><br />
        <br />
        <hr />
        <asp:MultiView ID="MultiView1" runat="Server">
            <asp:View ID="DefaultView" OnActivate="DefaultView_Activate" OnDeactivate="DefaultView_Deactivate"
                runat="Server">
                <asp:Panel ID="DefaultPanel1" Width="250px" BackColor="#C0C0FF" BorderColor="#404040"
                    BorderStyle="Double" runat="Server">
                    <asp:Label ID="DefaultLabel1" Font-Bold="true" Font-Size="20" Text="The Default View"
                        runat="Server" AssociatedControlID="DefaultView">
                    </asp:Label>
                </asp:Panel>
            </asp:View>
            <asp:View ID="NewsView" OnActivate="NewsView_Activate" OnDeactivate="NewsView_Deactivate"
                runat="Server">
                <asp:Panel ID="NewsPanel1" Width="250px" BackColor="#C0FFC0" BorderColor="#404040"
                    BorderStyle="Double" runat="Server">
                    <asp:Label ID="NewsLabel1" Font-Bold="true" Font-Size="20" Text="The News View" runat="Server"
                        AssociatedControlID="NewsView">                    
                    </asp:Label>
                </asp:Panel>
            </asp:View>
            <asp:View ID="ShoppingView" OnActivate="ShoppingView_Activate" OnDeactivate="ShoppingView_Deactivate"
                runat="Server">
                <asp:Panel ID="ShoppingPanel1" Width="250px" BackColor="#FFFFC0" BorderColor="#404040"
                    BorderStyle="Double" runat="Server">
                    <asp:Label ID="ShoppingLabel1" Font-Bold="true" Font-Size="20" Text="The Shopping View"
                        runat="Server" AssociatedControlID="ShoppingView">
                    </asp:Label>
                </asp:Panel>
            </asp:View>
        </asp:MultiView><br />
        <br />
        <asp:Label ID="ActivateLabel" BackColor="#ffff66" runat="Server">
        </asp:Label><br />
        <asp:Label ID="DeactivateLabel" BackColor="#ffff66" runat="Server">
        </asp:Label>
    </form>
</body>
</html>


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>View.Activate Event Example</title>

    <script runat="server">

        Sub Index_Changed(ByVal Sender As Object, ByVal e As EventArgs)
            ' Set the active view to
            ' the view selected by the user.
            Dim str As String = ViewListBox.SelectedItem.Text
            Select Case (str)
                Case "DefaultView"
                    MultiView1.SetActiveView(DefaultView)
                Case "NewsView"
                    MultiView1.SetActiveView(NewsView)
                Case "ShoppingView"
                    MultiView1.SetActiveView(ShoppingView)
            End Select

        End Sub

        ' The handler for the DefaultView's Activate event.
        Sub DefaultView_Activate(ByVal sender As Object, ByVal e As EventArgs)
            ' Notify the user that the event was raised.
            ActivateLabel.Text = "The Activate event was raised for the DefaultView."
        End Sub

        ' The handler for the DefaultView's Deactivate event.
        Sub DefaultView_Deactivate(ByVal sender As Object, ByVal e As EventArgs)
            ' Notify the user that the event was raised.
            DeactivateLabel.Text = "The Deactivate event was raised for the DefaultView."
        End Sub

        ' The handler for the ShoppingView's Activate event.
        Sub ShoppingView_Activate(ByVal sender As Object, ByVal e As EventArgs)
            ' Notify the user that the event was raised.
            ActivateLabel.Text = "The Activate event was raised for the ShoppingView."
        End Sub

        ' The handler for the ShoppingView's Deactivate event.
        Sub ShoppingView_Deactivate(ByVal sender As Object, ByVal e As EventArgs)
            ' Notify the user that the event was raised.
            DeactivateLabel.Text = "The Deactivate event was raised for the ShoppingView."
        End Sub

        ' The handler for the NewsView's Activate event.
        Sub NewsView_Activate(ByVal sender As Object, ByVal e As EventArgs)
            ' Notify the user that the event was raised.
            ActivateLabel.Text = "The Activate event was raised for the NewsView."
        End Sub

        ' The handler for the NewsView's Deactivate event.
        Sub NewsView_Deactivate(ByVal sender As Object, ByVal e As EventArgs)
            ' Notify the user that the event was raised.
            DeactivateLabel.Text = "The Deactivate event was raised for the NewsView."
        End Sub

        Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
            If Not (IsPostBack) Then
                MultiView1.SetActiveView(DefaultView)
            End If
        End Sub
    </script>

</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            View Activate and Deactivate Events Example</h3>
        <h4>
            Select a view to display in a MultiView control:</h4>
        <asp:ListBox ID="ViewListBox" Rows="1" SelectionMode="Single" AutoPostBack="True"
            OnSelectedIndexChanged="Index_Changed" runat="Server">
            <asp:ListItem Value="0">DefaultView</asp:ListItem>
            <asp:ListItem Value="1">NewsView</asp:ListItem>
            <asp:ListItem Value="2">ShoppingView</asp:ListItem>
        </asp:ListBox><br />
        <br />
        <hr />
        <asp:MultiView ID="MultiView1" runat="Server">
            <asp:View ID="DefaultView" OnActivate="DefaultView_Activate" OnDeactivate="DefaultView_Deactivate"
                runat="Server">
                <asp:Panel ID="DefaultPanel1" Width="250px" BackColor="#C0C0FF" BorderColor="#404040"
                    BorderStyle="Double" runat="Server">
                    <asp:Label ID="DefaultLabel1" Font-Bold="true" Font-Size="20" Text="The Default View"
                        runat="Server" AssociatedControlID="DefaultView">
                    </asp:Label>
                </asp:Panel>
            </asp:View>
            <asp:View ID="NewsView" OnActivate="NewsView_Activate" OnDeactivate="NewsView_Deactivate"
                runat="Server">
                <asp:Panel ID="NewsPanel1" Width="250px" BackColor="#C0FFC0" BorderColor="#404040"
                    BorderStyle="Double" runat="Server">
                    <asp:Label ID="NewsLabel1" Font-Bold="true" Font-Size="20" Text="The News View" runat="Server"
                        AssociatedControlID="NewsView">                    
                    </asp:Label>
                </asp:Panel>
            </asp:View>
            <asp:View ID="ShoppingView" OnActivate="ShoppingView_Activate" OnDeactivate="ShoppingView_Deactivate"
                runat="Server">
                <asp:Panel ID="ShoppingPanel1" Width="250px" BackColor="#FFFFC0" BorderColor="#404040"
                    BorderStyle="Double" runat="Server">
                    <asp:Label ID="ShoppingLabel1" Font-Bold="true" Font-Size="20" Text="The Shopping View"
                        runat="Server" AssociatedControlID="ShoppingView">
                    </asp:Label>
                </asp:Panel>
            </asp:View>
        </asp:MultiView><br />
        <br />
        <asp:Label ID="ActivateLabel" BackColor="#ffff66" runat="Server">
        </asp:Label><br />
        <asp:Label ID="DeactivateLabel" BackColor="#ffff66" runat="Server">
        </asp:Label>
    </form>
</body>
</html>

Keterangan

Peristiwa Activate dinaikkan ketika kontrol saat ini View menjadi tampilan aktif. Ini terjadi ketika nilai ActiveViewIndex properti berubah atau SetActiveView metode dipanggil untuk menentukan kontrol yang berbeda View . Misalnya, jika View1 adalah tampilan aktif dalam MultiView kontrol, ketika ActiveViewIndex properti berubah untuk menentukan View2, Activate peristiwa dinaikkan dan View2Deactivate peristiwa dinaikkan untuk View1.

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