C# 依据DataTable按组合条件(笛卡尔积)，创建透视表

namespace WindowsFormsApplication1

{

public static class Cartesian

{

/// < summary >

/// 计算笛卡尔积

/// </ summary >

/// < typeparam name = "T" ></ typeparam >

/// < param name = "lstSplit" ></ param >

/// < returns ></ returns >

public static List< List< T>> CartesianProduct< T>( this List< List< T>> lstSplit)

{

int count = 1;

lstSplit. ForEach(item => count *= item. Count);

var lstResult = new List< List< T>>();

for ( int i = 0; i < count; ++ i)

{

var lstTemp = new List< T>();

int j = 1;

lstSplit. ForEach(item =>

{

j *= item. Count;

lstTemp. Add( item[( i / ( count / j)) % item. Count]);

});

lstResult. Add( lstTemp);

}

return lstResult;

}

}

}

private void button3_Click( object sender, EventArgs e)

{

string cartesianFields = "No,Course";

List< string> lt;