我想我的一个控件的宽度属性设置为qualifiedDouble， 描述这里的MSDN 。 （向下滚动到XAML值部分看到使用qualifiedDouble的MSDN的信息）

I'm trying to set the width property of one of my controls to a qualifiedDouble, as described here on MSDN. (Scroll down to the "XAML Values" section to see MSDN's info on the use of a qualifiedDouble)

不过，我想知道如何实现这一目标，在code-后面，而不是XAML。我创建的用户控件不具备XAML重视他们，继承的目的。所以我必须手动执行所有的XAML操作，使用任何我可以在C＃。

However, I want to know how to achieve this in the code-behind, rather than XAML. The UserControls I am creating do not have XAML attached to them, for inheritance purposes. So I have to perform all XAML operations manually, using whatever I can in C#.

有谁知道如何qualifiedDouble是在$ C $取得了C-后面？

Does anyone know how qualifiedDouble is achieved in the code-behind?

推荐答案

什么巧合，我有这个今天早些时候做。合格的双打最终会通过基于你给它单元上的因素的转换，但由于部分 LengthConverter 。

What coincidence, I had to do this earlier today. The qualified doubles end up going through a factor conversion based on the unit you give it, but as part of LengthConverter.

LengthConverter lc = new LengthConverter();
string qualifiedDouble = "10pt";

double converted = lc.ConvertFrom( qualifiedDouble );

备选：

double original = 10.0;
double converted = original * 1.333333333; // px-to-pt conversion

这将改变10PT为13.3333333为例。你也可以使用转换系数的文章用品，但我preFER使用上述自从因素都内置到类。

This will transform "10pt" to 13.3333333, for example. You could also use the conversion factors the article supplies, but I prefer to use the above since the factors are built into the class.

编辑：为了响应点评一下琴弦......

Edited: In response to comment about strings...

字符串转换非常有意义的东西它的目的是为。他们使用XAML，因为它是如此容易得多EX preSS有些东西在XAML比C＃或VB。在XAML中，所有的值都是字符串，所以你必须类型转换器 S也可以自动选择将字符串转换为目标类型。 FontSizeConverter 为例，呼吁 LengthConverter 内部的静态方法。 （你也可以实例 FontSizeConverter 代替。）还有一些转换器 GridLength 就像4 *和宽度就像自动。或者，就像我说的，你可以创建自己的类来没有字符串转换。

String conversion makes perfect sense for what it was intended for. They use XAML because it is so much easier to express some things in XAML than in C# or VB. In XAML, all the values are strings, so you have TypeConverters automatically selected to convert the string to the target type. FontSizeConverter for example, calls an internal static method on LengthConverter. (You could also instantiate FontSizeConverter instead.) There are also converters for GridLengths like "4*" and Widths like "Auto". Or, like I said, you can create your own class to convert without strings.

这篇文章建议，为code-身后，用直接的因素，所以我上面提供一个备用的例子。

This article recommends, for code-behind, to use the factor directly, so I supplied an alternate example above.