当你从数据库里取出一些数据,然后要对数据进行整合,你很容易就会想到:
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DataTable dt = new DataTable();//假设dt是由"SELECT C1,C2,C3 FROM T1"查询出来的结果 2
for (int i = 0; i < dt.Rows.Count; i++) 3
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但这种做法用一两次还好说,用多了就累了。那有没有更好的方法呢?记得LinQ是可以直接对DataTable进行查询操作的,那在.Net Framework 2.0里,有没有类似的方法呢?答案是肯定的,就是dt.Select(),上面的操作可以改成这样:
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DataRow[] drArr = dt.Select("C1='abc'");//查询
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还可以这样操作:
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DataRow[] drArr = dt.Select("C1 LIKE 'abc%'");//模糊查询 2
DataRow[] drArr = dt.Select("'abc' LIKE C1 + '%'", "C2 DESC");//另一种模糊查询的方法 3
DataRow[] drArr = dt.Select("C1='abc'", "C2 DESC");//排序
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问题又来了,如果要把DataRow赋值给新的DataTable,怎么赋值呢?你可能会想到:
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DataTable dtNew = dt.Clone(); 2
for (int i = 0; i < drArr.Length; i++) 3![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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但这样程序就会出错,说该DataRow是属于其他DataTable的,那要怎么做呢?很简单,这样就可以解决了:
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DataTable dtNew = dt.Clone(); 2
for (int i = 0; i < drArr.Length; i++) 3![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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这样就完成了。
來自http://www.cnblogs.com/jianxm/archive/2009/03/31/1426681.html 与生俱来