覆盖基类中定义的属性 [英] Override a property defined in base class
问题描述
我有情况下的类层次结构是这样的，
I have case where the class hierarchy is something like this,
+---------------+
| UIElement |
|---------------| +----------------------+
| ... | | My Windows Application
| SomePropert{} | |----------------------|
| |<---+ |+--------------------+|
| | | ||MyUserControl ||
+---------------+ | ||--------------------||
+--------------+-----+ || ||
|FrameWorkElement | |+--------------------+|
|--------------------| |//Want to use |
| ... |<-+ |// SomeProperty; |
+--------------------+ | | |
+-----------+-+ | |
|Control | | |
|-------------| +----------------------+
| ... |<---+
+-------------+ |
+-----------+---+
| UserControl |
|---------------|<---+
| ... | |
+---------------+ |
+----------+-------+
| MyUserControl |
|------------------|
| SomeProperty{} |
| //Want to override
| |
+------------------+
在我的应用程序（和所有其他应用程序，我可以导出此的MyUserControl）
现在我可以设置 SomeProperty 由该处理的MyUserControl 类，而不是的UIElement ？
Now in my app (and all other apps where I can export this MyUserControl) can I set the SomeProperty that is handled by the MyUserControl class rather than UIElement?
我现在通过创建一个对象来这样做和的MyUserControl分配，要我在我的XAML page.So加入现在看起来是这样的控制，
I am right now doing this by creating an object to MyUserControl and assigning that to the control that I added in my xaml page.So right now looks like this,
MyUserControl newControl = new MyUserControl();
web = windowsPhoneControl11; //windowsPhoneControll1 is the
//one that I added from toolbox.
// i.e., mycustomecontrol added from toolbox.
所以，现在，因为我使用的是新它被覆盖。但是，当我出口这种控制我不能指望用户创建一个新的对象，一个是在XAML页面中使用它分配给控件。
So now since I am using the 'new' it gets overriden. But when I export this control I can't expect the user to create a new object and assign it to the control that one is using in the xaml page.
那么，有没有这样的财产分配由类的MyUserControl而不是的UIElement类处理，我可以覆盖此一个属性的任何其他方式？我的意思大概具有控制来设置该属性的MyUserControl是，我需要分配给它之前检查一些价值。如果不是ATLEAST预期值，那么我需要将其设置为默认值
So is there any other way I could override this one property so that the assignment of that property is handled by MyUserControl class rather than the UIElement class? What I mean about MyUserControl having the control to set this property is that I need to check for some value before assigning it. If it is not atleast an expected value then I need to set it to a default value.
PS：我是这么长的问题，抱歉，我无法表达它更精确，我没能找到与此相关的电气特性的问题。它是WindowsPhoneApp ......不是普通windowsapplication。
Ps: I am sorry for such a long question but I couldn't express it more precise and I was not able to find anyother question related to this. And it is WindowsPhoneApp... Not the ordinary windowsapplication.
推荐答案
原谅我，如果我理解正确这，但会以下工作方式：
Forgive me if I've interpreted this incorrectly but would the following work:
public class BaseClass
{
public int MyProperty
{
get; set;
}
}
public class ChildClass : BaseClass
{
public new int MyProperty
{
get
{
return base.MyProperty;
}
set
{
if(DoYourCheckingStuff(value))
{
base.MyProperty = value;
}
}
}
}
没't检验这一点。
虽然这种感觉就像做一个真正破解杂交的方式。什么属性，你实际上是试图有控制了吗？因为可能有这样做的更简单的方法
一个例子：更改用户控件，以便它的宽度不能100和200之间进行设置（虽然这可能是一个非常糟糕的方式做到这一点），通过隐藏它的宽度属性：
Didn't test this.
Although this feels like a really hack-ish way of doing it. What property are you actually trying to 'have control' over? Since there may be easier ways of doing this.
An example: Change a UserControl so that it's width can't be set between 100 and 200 (Although this is probably a pretty bad way to do it), by hiding it's Width property:
public class MyUserControl : UserControl
{
public new double Width
{
get
{
return base.Width;
}
set
{
if(!(value > 100 && value < 200))
base.Width = value;
}
}
}
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