数据写入Excel文件自动分页，并指定要合并的列索引

/// <summary>
/// 将DataTable数据写入Excel文件（自动分页，并指定要合并的列索引）
/// </summary>
/// <param name="dt">DataTable</param>
/// <param name="rows">每个WorkSheet写入多少行数据</param>
/// <param name="top">表格数据起始行索引</param>
/// <param name="left">表格数据起始列索引</param>
/// <param name="mergeColumnIndex">DataTable中要合并相同行的列索引，从0开始</param>
public void DataTableToExcel(DataTable dt,int rows,int top,int left,int mergeColumnIndex)
{
int rowCount = dt.Rows.Count; //源DataTable行数
int colCount = dt.Columns.Count; //源DataTable列数
sheetCount = this.GetSheetCount(rowCount,rows); //WorkSheet个数
// StringBuilder sb;

//复制sheetCount-1个WorkSheet对象
for(int i=1;i<sheetCount;i++)
{
workSheet = (Excel.Worksheet)workBook.Worksheets.get_Item(i);
workSheet.Copy(missing,workBook.Worksheets[i]);
}

for(int i=1;i<=sheetCount;i++)
{
int startRow = (i - 1) * rows; //记录起始行索引
int endRow = i * rows; //记录结束行索引

//若是最后一个WorkSheet，那么记录结束行索引为源DataTable行数
if(i == sheetCount)
endRow = rowCount;

//获取要写入数据的WorkSheet对象，并重命名
workSheet = (Excel.Worksheet)workBook.Worksheets.get_Item(i);
workSheet.Name = sheetPrefixName + "-" + i.ToString();

//将dt中的数据写入WorkSheet
// for(int j=0;j<endRow-startRow;j++)
// {
// for(int k=0;k<colCount;k++)
// {
// workSheet.Cells[top + j,left + k] = dt.Rows[startRow + j][k].ToString();
// }
// } //利用二维数组批量写入
int row = endRow-startRow;
string[,] ss = new string[row,colCount]; for(int j=0;j<row;j++)
{
for(int k=0;k<colCount;k++)
{
ss[j,k] = dt.Rows[startRow + j][k].ToString();
}
} range = (Excel.Range)workSheet.Cells[top,left];
range = range.get_Resize(row,colCount);
range.Value = ss; //合并相同行
this.MergeRows(workSheet,left+mergeColumnIndex,top,rows);

}
}