竖表转横表(支持多列)

在LoveCherry的blog中(http://www.cnblogs.com/lovecherry/archive/2005/04/28/146749.html)有一个竖表转横表的方法,但是只能支持只有一列的DataTable, 我改进了一下 可以支持多列.

public DataTable MakeData(DataTable dt,int iSize,int[] iColumnID) //isize:每列行数 iColumnID 需要横向排列的列的序号数组
        {   
            int ColumnCount=iColumnID.Length;
            int itmp=dt.Rows.Count%iSize; 
            int iColumn; //列数
            if(itmp==0) 
                iColumn=dt.Rows.Count/iSize; 
            else 
                iColumn=dt.Rows.Count/iSize+1; 
            DataTable newdt=new DataTable(); 
            for(int i=0;i<iColumn;i++) 
            {  
                for(int j=0;j<ColumnCount;j++)
                {  string aa=dt.Columns[iColumnID[j]].ColumnName+i;
                    DataColumn dc=new DataColumn(dt.Columns[iColumnID[j]].ColumnName+i,dt.Columns[iColumnID[j]].DataType); 
                
                    newdt.Columns.Add(dc); 
                }
            } 
            for(int i=0;i<iSize;i++) 
            {         
                DataRow dr=newdt.NewRow(); 
                for(int j=0;j<iColumn;j++) 
                { 
                    for(int k=0;k<ColumnCount;k++)
                    {
                        if((i+j*iSize)<dt.Rows.Count) 
                        {  string aa=dt.Columns[iColumnID[k]].ColumnName+j;
                            dr[dt.Columns[iColumnID[k]].ColumnName+j]=dt.Rows[i+j*iSize][iColumnID[k]]; 
                        }
                    }
                } 
                newdt.Rows.Add(dr);                 
            } 
            return newdt; 
        }