C#实现Excel合并单元格数据导入数据集详解

			object[] rv=new object[2];
			rv[0]=null;
			rv[1]="";
 
			//创建一个名为ExcelApp的组件对象
//			ExcelApplication excel = new ExcelApplication();
            Excel.Application excel = new Excel.Application();
			excel.DisplayAlerts=false;
			excel.AskToUpdateLinks=false;
			Excel.Workbook xb=excel.Workbooks.Add(_filename);
//获取活动的 worksheet和 excel sheet的个数,准备遍历sheets
			Worksheet worksheet = (Worksheet) excel.ActiveSheet;
			sheetCount=excel.Sheets.Count;  
			int	startSheetIndex=1;
			int	endSheetIndex=sheetCount;
			DataSet ds=new DataSet();
//遍历sheets
            for (int currentIndex = startSheetIndex; currentIndex <= endSheetIndex; currentIndex++)
            {
                worksheet = (Worksheet)excel.Worksheets[currentIndex];
                worksheet.Activate();
                
                //处理每一个sheet.....
 
            }

//获取起始单元和截止单元格，以确定有效区域
 
                Excel.Range _startcell=worksheet.Range["A1","A1"]; //默认为第一个单元格
				if(startaddress!="")
				{
					try
					{
						_startcell=worksheet.Range[startaddress,startaddress];
					}
					catch(Exception ex)
					{
						rv[1]+=string.Format("{1}指定的起始单元格地址{0}，不是合法的地址。\r\n",startaddress,worksheet.Name);
						//					KillProcessByStartTime("EXCEL",beforetime,aftertime);
						continue;
					}
				}
 
				Excel.Range _lastcell=worksheet.Cells.SpecialCells(XlCellType.xlCellTypeLastCell,Type.Missing);
//默认获取有值的最后一个有效的单元格
				if(endaddress!="")
				{
					try
					{
						_lastcell=worksheet.Range[endaddress,endaddress];
					}
					catch(Exception ex)
					{
						rv[1]+=string.Format("{1}指定的结束单元格地址{0}，不是合法的地址。\r\n",endaddress,worksheet.Name);
						//					KillProcessByStartTime("EXCEL",beforetime,aftertime);
						//						return rv;
						continue;
					}
				}
 
 
//遍历有效区域单元格
 
                    foreach (Excel.Range aicell in worksheet.Range[_startcell,_lastcell])
                    {
                        if (aicell.MergeCells.ToString() == "True")
                        {
                            //处理合并单元格
                            object temp_merge_value = aicell.Value2; //备份单元格的值
                            int u_row = aicell.Row;  //记录单元格的首行索引
                            int u_rows = aicell.MergeArea.Rows.Count; //记录单元格的合并区域包含的行数
                            int u_col = aicell.Column; //记录单元格的首列索引
                            int u_cols = aicell.MergeArea.Columns.Count; //记录单元格的合并区域包含的列数
                            aicell.MergeArea.UnMerge();  //取消合并，拆分单元格
                            Excel.Range new_aicell = worksheet.Range[worksheet.Cells[u_row, u_col], worksheet.Cells[u_row + u_rows - 1, u_col + u_cols - 1]];  //获取拆分后单元格后的有效区域
                            new_aicell.Value2 = temp_merge_value; //将拆分的单元格重新赋值(备份值)
                        }
                    }

				System.Data.DataTable dt=ds.Tables.Add();
				dt.TableName=worksheet.Name;  //表名为worksheet的名称
				for(int i=_startcell.Column;i<=_lastcell.Column;i++)
				{
					Excel.Range _cell=worksheet.Range[worksheet.Cells[_startcell.Row,i],worksheet.Cells[_startcell.Row,i]];
								string _colname=hastitle==true?_cell.Value2.ToString():"C"+(i-_startcell.Column+1).ToString(); //如果第一行是标题，则赋单元格的值，否则以C开头加序号
						DataColumn dc=dt.Columns.Add();
						dc.ColumnName=_colname;
						dc.DataType=System.Type.GetType("System.String");
						dc.AllowDBNull=true;
				}
				

object[,] cells=null;  定义二维对象数组
    if(hastitle) //如果首行包含列，则加行索引加1取数据行
	{
		startrow=_startcell.Row+1;  
    }
//将有效区域单元格转化赋值为 object[,]	
cells=(object[,])worksheet.Range[worksheet.Cells[startrow,_startcell.Column],worksheet.Cells[_lastcell.Row,_lastcell.Column]].Value2;
 
//遍历数组，添加行数据到 DataTable里
int _rowcount=cells.GetLength(0);
int _colcount=cells.GetLength(1);
for(int i=0;i<_rowcount;i++)
{
	object[] newrowdata=new object[_colcount];
	for(int j=0;j<_colcount;j++)
	{
		newrowdata[j]=cells[i,j];
	}
	DataRow dr=dt.Rows.Add(newrowdata);
}