xaml文件中控件的x:name和name有什么区别? [英] Is there any difference in x:name and name for controls in xaml file?

问题描述

我是Silverlight的新手.
当我使用Visual Studio将一些控件添加到我的xaml文件中时，它使用Name属性设置了控件名称，但是还存在x:Name.
有什么区别，何时使用它们?
谢谢.

I am new in Silverlight.
When I add some control to my xaml file with Visual Studio it set controls name with Name property, but there is also x:Name.
Is there any difference and when to use each of them?
Thanks.

推荐答案

简介

是的，有区别.最重要的是，x:Name可以用于不具有自身Name属性的对象元素.

Yes there is a difference. The bottom line is that x:Name can be used on object elements that do not have Name properties of their own.

详细说明

您只能在表示确实具有Name属性的对象的元素上使用Name.例如，任何源自FrameworkElement的东西.

You can only use Name on an element that represents an object that actually does have a Name property. For example anything that derives from FrameworkElement.

x:Name属性可以放置在表示对象的任何元素上，无论该对象是否实际上具有Name属性.如果对象确实具有Name属性，则将为它分配x:Name值，因此同一元素上不能同时具有x:Name和Name.

The x:Name attribute may be placed on any element that represents an object regardless of whether that object actually has a Name property. If the object does have a Name property then the value of x:Name will be assigned to it hence you can't have both x:Name and Name on the same element.

当对象具有Name属性或x:Name属性时，该属性的值与对象树中的对象条目相关联. FrameworkElement的FindName方法通过对象树可以找到对象. FindName可以按名称查找对象，即使该对象不使用自身的Name属性，因为它使用记录在对象树中的名称.

When an object has a Name property or an x:Name property the value of that property is associated with the objects entry in the object tree. It is via the object tree that the FindName method of a FrameworkElement can find an object. FindName can find objects by name even if that object does not carry a Name property of its own since it uses the name recorded in the object tree.

UserControl的自动生成的代码将包含具有Name或x:Name属性的任何元素的字段定义.生成的InitialiseComponent方法将使用FindName方法将值分配给这些字段.

The autogenerated code for a UserControl will contain field definitions for any element that that has a Name or x:Name property. The InitialiseComponent method that is generated will use the FindName method to assign values to these fields.

示例

上面的Xaml创建两个类型为Grid的字段LayoutRoot和类型为SolidColorBrush的MyBrush.如果将x:Name="LayoutRoot"更改为Name="LayoutRoot"，则不会有任何改变. Grid具有Name属性.但是，尝试将x:Name="MyBrush"更改为Name="MyBrush".这不起作用，因为SolidColorBrush没有名称属性.使用上面的Xaml，您可以执行以下代码:-

The above Xaml creates two fields LayoutRoot of type Grid and MyBrush of type SolidColorBrush. If you were to change x:Name="LayoutRoot" to Name="LayoutRoot" that would change nothing. Grid has a Name property. However try changing x:Name="MyBrush" to Name="MyBrush". That doesn't work because SolidColorBrush doesn't have a name property. With the above Xaml you can then do code like this:-

    public MainPage()
    {
        InitializeComponent();
        MyBrush.Color = Colors.LightGray;
    }

打开InitializeComponent的定义，看看自动生成的代码.

Open the definition of InitializeComponent and take a look at the auto generated code.

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