将一个DataTable分解成多个DataTable

/// <summary>
/// 分解数据表
/// </summary>
/// <param name="originalTab">需要分解的表</param>
/// <param name="rowsNum">每个表包含的数据量</param>
/// <returns></returns>
public DataSet SplitDataTable(DataTable originalTab, int rowsNum)
{
//获取所需创建的表数量
int tableNum = originalTab.Rows.Count / rowsNum;

//获取数据余数
int remainder = originalTab.Rows.Count % rowsNum;

DataSet ds = new DataSet();

//如果只需要创建1个表，直接将原始表存入DataSet
if (tableNum == 0)
{
ds.Tables.Add(originalTab);
}
else
{
DataTable[] tableSlice = new DataTable[tableNum];

//Save orginal columns into new table.
for (int c = 0; c<tableNum; c++)
{
tableSlice[c] = new DataTable();
foreach(DataColumn dc in originalTab.Columns)
{
tableSlice[c].Columns.Add(dc.ColumnName,dc.DataType);
}
}
//Import Rows
for (int i = 0; i < tableNum; i ++)
{
// if the current table is not the last one
if (i != tableNum -1)
{
for(int j = i*rowsNum ; j < ((i+1)*rowsNum); j++)
{
tableSlice[i].ImportRow(originalTab.Rows[j]);
}
}
else
{
for(int k = i*rowsNum ; k < ((i+1)*rowsNum+remainder); k++)
{
tableSlice[i].ImportRow(originalTab.Rows[k]);
}
}
}

//add all tables into a dataset
foreach(DataTable dt in tableSlice)
{
ds.Tables.Add(dt);
}
}
return ds;
}