Wizard.AllowNavigationToStep(Int32) 方法
定义
重要
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使用一个布尔值来确定 ActiveStep 属性是否可以设置为与传入的索引对应的 WizardStepBase 对象。
protected:
virtual bool AllowNavigationToStep(int index);protected virtual bool AllowNavigationToStep (int index);abstract member AllowNavigationToStep : int -> bool
override this.AllowNavigationToStep : int -> boolProtected Overridable Function AllowNavigationToStep (index As Integer) As Boolean参数
- index
- Int32
被检查的 WizardStepBase 对象的索引。
返回
如果传入的索引引用已经被访问过而且 WizardStepBase 属性设置为 false 的 AllowReturn，则为 false；否则为 true。
示例
下面的代码示例演示如何创建一 CustomWizard 个名为和重写该方法的 OnSideBarButtonClick 派生类。 单击控件边栏区域 CustomWizard 上的按钮时， AllowNavigationToStep 将调用该方法以确定是否可以访问所选步骤。 然后将消息写入包含网页，告知用户所发生的情况。
<%@ page language="C#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
// This custom wizard control defines the OnSideBarButtonClick method
// that uses the AllowNavigationToStep method to determine whether the
// value passed in can be used to set the ActiveStepIndex property.
class CustomWizard : Wizard
{
override protected void OnSideBarButtonClick(WizardNavigationEventArgs e)
{
base.OnSideBarButtonClick(e);
if (AllowNavigationToStep(e.NextStepIndex))
{
this.Page.Response.Write("AllowNavigationToStep() returned true, moving to Step"
+ (e.NextStepIndex + 1).ToString() + ".");
this.ActiveStepIndex = e.NextStepIndex;
}
else
{
this.Page.Response.Write("AllowNavigationToStep() returned false for Step"
+ (e.NextStepIndex + 1).ToString() + ", moving to Step2.");
this.ActiveStepIndex = 1;
}
}
}
// Add the custom wizard control to the page.
void Page_Load(object sender, EventArgs e)
{
CustomWizard WizardControl = new CustomWizard();
WizardControl.ID = "WizardControl";
// Create some steps for the custom wizard.
for (int i = 0; i <= 5; i++)
{
WizardStep newStep = new WizardStep();
newStep.ID = "Step" + (i + 1).ToString();
// Set AllowReturn to false for some of the steps.
if ((i % 2) == 0)
{
newStep.AllowReturn = false;
}
// Add each step to the custom wizard.
WizardControl.WizardSteps.Add(newStep);
}
// Display the wizard on the page.
PlaceHolder1.Controls.Add(WizardControl);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>AllowNavigationToStep Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>AllowNavigationToStep Example</h3>
<asp:PlaceHolder id="PlaceHolder1"
runat="server" />
</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">
<script runat="server">
' This custom wizard control defines the OnSideBarButtonClick method
' that uses the AllowNavigationToStep method to determine whether the
' value passed in can be used to set the ActiveStepIndex property.
Class CustomWizard
Inherits Wizard
Protected Overloads Sub OnSideBarButtonClick(ByVal sender As Object, _
ByVal e As WizardNavigationEventArgs) Handles Me.SideBarButtonClick
If AllowNavigationToStep(e.NextStepIndex) Then
Me.Page.Response.Write("AllowNavigationToStep() returned true, moving to Step" & _
(e.NextStepIndex + 1).ToString() & ".")
Me.ActiveStepIndex = e.NextStepIndex
Else
Me.Page.Response.Write("AllowNavigationToStep() returned false for Step" & _
(e.NextStepIndex + 1).ToString() & ", moving to Step2.")
Me.ActiveStepIndex = 1
End If
End Sub
End Class
' Add the custom wizard control to the page.
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
Dim WizardControl As New CustomWizard()
WizardControl.ID = "WizardControl"
' Create some steps for the custom wizard.
For i As Integer = 0 To 5
Dim newStep As New WizardStep()
newStep.ID = "Step" & (i + 1).ToString()
' Set AllowReturn to false for some of the steps.
If ((i Mod 2) = 0) Then
newStep.AllowReturn = False
End If
' Add each step to the custom wizard.
WizardControl.WizardSteps.Add(newStep)
Next
' Display the wizard on the page.
PlaceHolder1.Controls.Add(WizardControl)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>AllowNavigationToStep Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>AllowNavigationToStep Example</h3>
<asp:PlaceHolder id="PlaceHolder1"
runat="server" />
</form>
</body>
</html>
注解
AllowNavigationToStep仅由于派生类的protected修饰符，才能从派生类访问该方法。 在派生类中，可以使用 AllowNavigationToStep 该方法来确定传入的索引是否可用于设置 ActiveStepIndex 属性。 AllowNavigationToStep false如果传入的索引引用WizardStepBase已访问且其AllowReturn属性设置为 false;否则，该方法将返回true。