DefaultButton中的MultiView.ActiveViewChanged事件

Question

我在asp.net中使用一个asp.net控件，在ActiveViewChanged事件中，我希望从所选视图开始以编程方式设置默认按钮，因此我使用代码：

if(myMultiview.GetActiveview() == myView)
   this.Page.Form.DefaultButton = btnDefault.UniqueID;

在这里，btnDefault存在于myView中，即使它引发异常'System.NullReferenceException'

请给我建议解决办法

Answer 1

我有类似的问题，我试过这个，

<asp:Panel id="myPanel" runat="server" DefaultButton="ButtonID"> <asp:MultiView ID="MultiView1" runat="server" ActiveViewIndex="0"> <asp:View ID="View1" runat="server" > <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1\_Click" /> </asp:View> <asp:View ID="View2" runat="server"> <asp:Button ID="Button2" runat="server" Text="Button" onclick="Button2\_Click" /> </asp:View> </asp:MultiView> </asp:Panel> </div> </form>

protected void Page_Load(object sender, EventArgs e)
    {
        myPanel.DefaultButton = "Button1";
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Write("View1 Button is clicked");
        MultiView1.ActiveViewIndex = 1;
        myPanel.DefaultButton = "Button2";
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Write("View2 Button is clicked");
        MultiView1.ActiveViewIndex = 0;
    }

可能对你有帮助。