Hashtable 使用GetEnumerator() 时发生 System.InvalidOperationException类型错误
an exception of type
System.InvalidOperationException is thrown if the collection is modified within a foreach loop, reporting that the collection was modified after the enumerator was instantiated.
因为枚举的时候改变了Hashtable集合.
http://mark.michaelis.net/Blog/TheInternalsOfForeach.aspxhttp://support.microsoft.com/kb/815634/zh-cn
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