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string s = " from dual union all ";
s = s.Trim().TrimEnd("union all".ToCharArray());
结果是"from d"
http://www.cnblogs.com/carekee/articles/2094731.html
C#中Trim()、TrimStart()、TrimEnd()的用法
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原文地址:http://www.cnblogs.com/yangai/p/5764787.html