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(1)基本用法 xaml中可以实例化各种对象,比如在ResourceDictionary中定义字符串常量: <ResourceDictionaryxmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"                   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"                   xmlns:system="clr-namespace:System;assembly=mscorlib">     <FontFamilyx:Key="UID_GlobalFont_Family">Microsoft YaHei</FontFamily>   <system:Stringx:Key="UID_Refresh">  Refresh </system:String> </ResourceDictionary> 上述资源字典中定义了字符串常量UID_Refresh, 实际使用步骤: 1.在使用的xaml通过ResourceDictionary.MergedDictionaries导入上述资源 <UserControl.Resources>       <ResourceDictionary>           <ResourceDictionary.MergedDictionaries>               <ResourceDictionarySource="/XXXXXXXXXXXXXXX;component/XXXXXXXXXXX.xaml" />           </ResourceDictionary.MergedDictionaries>       </ResourceDictionary>   </UserControl.Resources>     2.通过DynamicResource 或者 StaticResource来引用这个字符串常量 <TextBlock Text="{DynamicResourceUID_Refresh}" /> (2)存在的问题 上述UID_Refresh的定义有空格,实际显示却没有空格 (3)解决办法 用&#160;来代替空格。 <system:Stringx:Key="UID_Refresh">&#160;Refresh&#160;</system:String>