[英]How to create a control with ValidationGroup and a custom validation?
I want to make panels Visibility
true
or false
based on a result of a Func
. 我想根据Func
的结果使面板Visibility
true
或false
。
I have a page with controls as in the following code: 我有一个包含控件的页面,如下面的代码所示:
<asp:Panel ID="Panel2" runat="server">
<asp:Panel ID="Panel3" runat="server">
<c:PermissionPanel ID="P1" runat="server" ValidationGroup="Val1">
Validation Group 1 - OK
</c:PermissionPanel>
</asp:Panel>
</asp:Panel>
<c:PermissionPanel ID="P2" runat="server" ValidationGroup="Val1">
Validation Group 1 - OK
</c:PermissionPanel>
<hr />
<c:PermissionPanel ID="P3" runat="server" ValidationGroup="Val2">
Validation Group 2 - OK
</c:PermissionPanel>
<asp:Panel ID="Panel4" runat="server">
<asp:Panel ID="Panel1" runat="server">
<c:PermissionPanel ID="P4" runat="server" ValidationGroup="Val2">
Validation Group 2 - OK
</c:PermissionPanel>
</asp:Panel>
</asp:Panel>
In short I have 4 PermissionPanel
that can be inside other controls. 简而言之,我有4个PermissionPanel
,可以在其他控件中。
The code of the PermissionPanel
is the following: PermissionPanel
的代码如下:
public class PermissionPanel : Panel
{
public delegate bool OnValidate();
public event OnValidate Validate;
public string ValidationGroup { get; set; }
protected override void OnPreRender(EventArgs e)
{
this.Visible = (Validate != null ? Validate() : false);
base.OnPreRender(e);
}
}
I want to get all PermissionPanel
s from the page and add an event on each accordingly to its group, for example: 我希望从页面中获取所有PermissionPanel
,并在每个上添加一个事件,相应于其组,例如:
protected void Page_Load(object sender, EventArgs e)
{
// Magic code here. Linq is very welcome
// GetPageControls<PermissionPanel>("Val1").AddEvent(() => return true);
// GetPageControls<PermissionPanel>("Val2").AddEvent(() => return false);
}
The code above would make all panels with ValidationGroup
== Val1
visible while Val2
would not be rendered. 上面的代码将使ValidationGroup
== Val1
所有面板都可见,而Val2
将不会呈现。
So the questions are : How can I achieve this? 所以问题是 :我怎样才能做到这一点? Is there a better way of doing it? 有没有更好的方法呢?
In short I want to add a Func
that will be a validation method allowing the panels to be shown or not. 总之,我想添加一个Func
,它将是一个验证方法,允许显示或不显示面板。 A real example is: 一个真实的例子是:
// If post owner is the logged user, show controls like edit and delete
() => return (user != null && user.ID == post.UserID);
There is two ways that I´m aware of: searching or self-registering . 我有两种方法可以识别: 搜索或自我注册 。 In searching you´ll get every control in the control hierarchy starting by the page, recursively and checking if it is a PermissionPanel
. 在搜索中,您将获取控件层次结构中的每个控件,从页面开始,递归并检查它是否是PermissionPanel
。
The second way, self-registering which I like you´ll update PermissionPanel
to register itself in a list inside Page.Items
and register your validation handler only for controls in this list. 第二种方式,我喜欢自我注册,你会更新PermissionPanel
,在Page.Items
中的列表中注册自己,并仅为此列表中的控件注册验证处理程序。
On PermissionPanel
you can do something like that: 在PermissionPanel
您可以执行以下操作:
protected override void CreateChildControls()
{
base.CreateChildControls();
List <PermissionPanel> panels;
if (Page.Items["PermissionPanels"] == null)
Page.Items["PermissionPanels"] = panels = new List <PermissionPanel>();
else
panels = Page.Items["PermissionPanels"] as List <PermissionPanel>;
panels.Add(this);
}
And on page OnPreRender you can iterate over Page.Items["PermissionPanels"]
and registering validation handlers according to your validation group. 在OnPreRender页面上,您可以迭代Page.Items["PermissionPanels"]
并根据您的验证组注册验证处理程序。
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