（1）基本用法 xaml中可以實例化各種對象，比如在ResourceDictionary中定義字符串常量： <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> 上述資源字典中定義了字符串常量UID_Refresh, 實際使用步驟： 1.在使用的xaml通過ResourceDictionary.MergedDictionaries導入上述資源 <UserControl.Resources> ??????<ResourceDictionary> ??????????<ResourceDictionary.MergedDictionaries> ??????????????<ResourceDictionarySource="/XXXXXXXXXXXXXXX;component/XXXXXXXXXXX.xaml" /> ??????????</ResourceDictionary.MergedDictionaries> ? ? ??</ResourceDictionary> ??</UserControl.Resources> ? ? 2.通過DynamicResource 或者 StaticResource來引用這個字符串常量 <TextBlock?Text="{DynamicResourceUID_Refresh}"?/> （2）存在的問題 上述UID_Refresh的定義有空格，實際顯示卻沒有空格 （3）解決辦法 用&#160;來代替空格。 <system:Stringx:Key="UID_Refresh">&#160;Refresh&#160;</system:String>