偶然需要在应用中访问剪贴板，其实和SL访问剪贴板是一样的。
参考下MSDN：
写得清楚明白：
Clipboard Class
：
System.Windows.Clipboard
Namespace:
Assembly: System.Windows (in System.Windows.dll)
有三个方法：
看名字就能知道用法了额
ContainsText返回值是bool型，用于查看Clipboard是否有内容
GetText 是从Clipboard取值
SetText 是往Clipboard赋值
不过要注意GetText 和SetText 可能会引起SecurityException哦
参见MSDN：和
GetText SecurityException：
Invoked this method from outside a user-initiated context.
Clipboard access user dialog box was not confirmed.
Invoked this method in a Windows Phone application.
SetText SecurityException：
Invoked this method from outside a user-initiated context.
Clipboard access user dialog box was not confirmed.
Under partial trust (the default mode), Silverlight restricts clipboard access to its two key APIs: and SetText. These APIs can only be invoked from within a context that is determined by the Silverlight runtime to be in response to a user-initiated action. For example, clipboard access is valid from within a handler for a or event. For examples of situations that are not considered user-initiated, clipboard access is not valid from a handler for or from a constructor. Clipboard access under partial trust also requires the user to confirm access through completion of a Silverlight access-confirmation dialog box.
If you specifically produce an out-of-browser application and request elevated trust, this security restriction on the API and its dialog box are not used. For more information, see .
简单说就是GetText和SetText 在Click 或 KeyDown事件中是被允许的，在 Loaded事件或构造函数中是被禁止访问的。
在使用的时候要注意额…
（PS：试了下在WP里SetText 是可以在Loaded使用，而GetText会报异常）