C#实现Pivot（Cross Table）的一段代码和例子

public static DataTable Pivot(IDataReader dataValues, string keyColumn, string pivotNameColumn, string pivotValueColumn) 

dataValues -- this is any open DataReader object, ready to be transformed and pivoted into a DataTable.  As mentioned, it should be fully grouped, aggregated, sorted and ready to go.  要处理的DataReader

keyColumn -- This is the column in the DataReader which serves to identify each row.  In the previous example, this would be CustomerID.  Your DataReader's recordset should be grouped and sorted by this column as well. X轴字段

pivotNameColumn -- This is the column in the DataReader that contains the values you'd like to transform from rows into columns.   In the example, this would be ProductName. Y轴字段

pivotValueColumn -- This is the column that in the DataReader that contains the values to pivot into the appropriate columns.  For our example, it would be Qty, which has been defined in the SELECT statement as SUM(Qty).数据区字段

例子：

private void Sample()

转载自：http://weblogs.sqlteam.com/jeffs/archive/2005/05/11/5101.aspx