WPF在XAML里面引用枚举值的注意点

本来以为XAML的扩展x:Static很简单，但在实际的编程过程中，遇到了不小的麻烦，看如下代码(其中，VM名字空间指向正确)，我试图将枚举值FetchAndShowMode赋给CommandParameter，可是却编译出错：Cannot find the type 'MoviesVM.FetchAndShowMode'. Note that type names are case sensitive.

partial class MoviesVM
{
public enum FetchAndShowMode
{
None, // Needn't refetch the data
Recent, // Fetch recent recorded movies
All, // Fetch all the movies
ByKeyword, // Fetch the movies by name
Default, // Fetch the movies by defalut settings
NotVerified, // Fetch not verified movies
Special // Reserve for future use
};

<ribbon:RibbonButton LargeImageSource="Resources\Images\Ribbon\RecentMovies.png" Label="近期影片"
Command="local:MainWindow.ViewMovies"
CommandParameter="{x:Static vm:MoviesVM.FetchAndShowMode.Recent}" />

　　网上查了下，发现，假如是内嵌的类型，WPF需要你使用“+”来分割，所以应该写成vm:MoviesVM+FetchAndShowMode。但是，编译仍然不过，说：Only public or internal classes can be used within markup. 'FetchAndShowMode' type is not public or internal. 但是FetchAndShowMode明明是public的啊!自己查了下原因，应该是编译器比较傻，MovieVM类是internal的，FetchAndShowMode是public就不认，假如把他们俩同时改成public或者都是internal的就可以了，这个也不知道是不是一个bug。。。

　　最后，能通过编译并正常运行的代码如下：

public partial class MoviesVM
{
public enum FetchAndShowMode
{
None, // Needn't refetch the data
Recent, // Fetch recent recorded movies
All, // Fetch all the movies
ByKeyword, // Fetch the movies by name
Default, // Fetch the movies by defalut settings
NotVerified, // Fetch not verified movies
Special // Reserve for future use
};

<ribbon:RibbonButton LargeImageSource="Resources\Images\Ribbon\RecentMovies.png" Label="近期影片"
Command="local:MainWindow.ViewMovies"
CommandParameter="{x:Static vm:MoviesVM+FetchAndShowMode.Recent}" />

　　本文来自puncha的博客，原文地址：http://blog.csdn.net/puncha/article/details/7434603