如何使用asp.net克隆/复制控件（带子控件）？ [英] How to clone / copy a control (with child controls) using asp.net?

问题描述

我已经尝试了几种不同的解决方案，这些解决方案在网上和其他地方都没有运气到目前为止。也许你们其中一个知识渊博的人可能会帮忙...

I've tried a few different solutions found on here and elsewhere on the web without luck so far. Maybe one of you knowledgeable lot might be able to help...

我有一堆由用户动态创建的控件我在会话状态中存储为控件集合，因此我可以在每次回发时显示它们。

I have a bunch of dynamically created controls by the user which I'm storing as a control collection in the session state so I can display them on every postback.

用户的每个控件generate是一个带有其他控件的div。

Each control that the user generates is a div with other controls inside it.

我在每个控件上都有一个按钮，允许用户删除合作控制或复制它。

I have a button on each control that will allow the user to either delete the control or duplicate it.

当用户点击"Duplicate"时，我正在调用处理事件的web方法。

When the user hits "Duplicate" I am calling my web method which handles the event.

当我的web方法找到要复制的控件时，我想制作该控件的副本并将其添加到页面中（另一个函数处理将其保存到控件集合中） page_Unload）
$

When my web method finds the control to be duplicated, I want to make a copy of that control and add it to the page (another function deals with saving it to the control collection (on page_Unload)

Dim DupCtrl As Control = Nothing

        Dim int As Integer = myDynControls.Count
        For i = 0 To int - 1

            If myDynControls(i).ID.Contains(ctrlID) Then
                DupCtrl = Clone_Control(myDynControls(i))
                Exit For
            End If

        Next
End Function

和Clone_Control功能：

Public Shared Function Clone_Control(OriginalControl As Object) As Object

    Dim type As Type = OriginalControl.[GetType]()
    Dim properties As Reflection.PropertyInfo() = type.GetProperties()
    Dim retObject As [Object] = type.InvokeMember("", System.Reflection.BindingFlags.CreateInstance, Nothing, OriginalControl, Nothing)
    For Each propertyInfo As Reflection.PropertyInfo In properties
        If propertyInfo.CanWrite Then
            propertyInfo.SetValue(retObject, propertyInfo.GetValue(OriginalControl, Nothing), Nothing)
        End If
    Next
    Return retObject
End Function

不幸的是，启动PropertyInfo.SetValue的行....总是出错：

"Exception has been thrown by the target of an invocation."

当我查看InnerException：

"Cannot get inner content of dynDiv_FormCtrl_Wrapper_10432 because the contents are not literal."

任何人都可以帮我指点正确的方向让这个工作吗？

Can anyone please help point me in the right direction to get this working ?

感谢阅读！

Thanks for reading !

推荐答案

 你不能使用反射来获取/设置对象属性。应该总是强类型。

 You can't get/set the objects property using reflections. Should be always strongly typed.

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