单击按钮时出现奇怪的错误。救命？
[该程序是一个Windows应用程序，用Visual Basic编写] 您好，我正在制作转换器，当我点击go按钮时，我收到此错误：
[The program is a Windows Store app, being written in Visual Basic] Hello, I'm making a converter and when I click the go button, I get this error:
这是单击按钮时执行的代码（tempfrom和tempto是组合框）：
This is the code the button executes when clicked (tempfrom and tempto are combo boxes):
（粗体表示发生错误的位置）
(Bold indicates where the error occurred)
~TechPerson32
~ TechPerson32
如果你的组合框绑定了某些东西，你需要将它强制转换为它所显示的类型类。  如果它只是一个字符串列表，我会尝试这个。
If your combobox is bound to something you will need to cast it to the type class it is showing. If it is just a list of strings I would try this.
if tempfrom .SelectedItem.ToString（）=" Fahrenheit"然后
如果它绑定到类
If DirectCast（tempfrom.SelectedItem，MyClass ）.MyProperty ="Fahrenheit"
然后