View.Activate Ereignis

Referenz

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Tritt ein, wenn das aktuelle View-Steuerelement zur aktiven Ansicht wird.

public:
 event EventHandler ^ Activate;

public event EventHandler Activate;

member this.Activate : EventHandler

Public Custom Event Activate As EventHandler

Ereignistyp

EventHandler

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie sie einen Ereignishandler für das Activate Ereignis eines Steuerelements angeben und codieren View . Wenn sich die aktive Ansicht ändert, wird dem Benutzer eine Meldung angezeigt, die das View Steuerelement angibt, das das Activate Ereignis ausgelöst hat, und das View Steuerelement, das das Deactivate Ereignis ausgelöst hat.


<%@ 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>

Hinweise

Das Activate Ereignis wird ausgelöst, wenn das aktuelle View Steuerelement zur aktiven Ansicht wird. Dies tritt auf, wenn sich der Wert der ActiveViewIndex Eigenschaft ändert oder die SetActiveView -Methode aufgerufen wird, um ein anderes View Steuerelement anzugeben. Wenn es sich View1 beispielsweise um die aktive Ansicht innerhalb eines Steuerelements MultiView handelt, wird das Activate Ereignis ausgelöst, und das Ereignis wird für View1ausgelöstView2, wenn sich die ActiveViewIndex Deactivate -Eigenschaft ändert, um anzugebenView2.

Gilt für:

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