用C#创建Excel，添加下拉框列，并动态给下拉框赋值

public void simpleButton1_Click(object sender, EventArgs e) 
{ 
KillProcess("Excel");//首先杀死进程 
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application(); 
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks; 
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet); 
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1]; 
Microsoft.Office.Interop.Excel.Range range = worksheet.Cells; 

//Excel.Range ran = range.get_Range("A5", "A5"); 
//ran.AddComment("批注"); 
Excel.Range ran1 = worksheet.Columns.get_Range("H:H", Type.Missing);//或者.get_Range("D1", "D1").get_Resize(50,1);//获取一整列D，行数为50 
ran1.Validation.Delete();//有无都可以 
ran1.Validation.Add(Excel.XlDVType.xlValidateList, Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, "1,2,3", Type.Missing); 
//填充值 
worksheet.Cells[1, 1] = "用户代码"; 
worksheet.Cells[1, 2] = "用户名称"; 
worksheet.Cells[1, 3] = "绩效积分项"; 
worksheet.Cells[1, 4] = "绩效积分时间"; 
worksheet.Cells[1, 5] = "描述"; 

//先把下拉框值赋值在Z列上 

//杀死进程 
private void KillProcess(string processName) 
{ 
//获得进程对象，以用来操作 
System.Diagnostics.Process myproc = new System.Diagnostics.Process(); 
//得到所有打开的进程 
try 
{ 
//获得需要杀死的进程名 
foreach (Process thisproc in Process.GetProcessesByName(processName)) 
{ 
//立即杀死进程 
thisproc.Kill(); 
} 
} 
catch (Exception Exc) 
{ 
throw new Exception("", Exc); 
} 
}
worksheet.Cells[1, 26] = "a"; 
worksheet.Cells[2, 26] = "b"; 
worksheet.Cells[3, 26] = "c"; 
//在把Z列值赋值到下拉框列上 
worksheet.get_Range(worksheet.Cells[1, 3], worksheet.Cells[10000, 3]).Validation.Add(Excel.XlDVType.xlValidateList, Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, "=$Z$1:$Z$5", Type.Missing); 

//最后隐藏Z列 
Excel.Range ranger = (Excel.Range)worksheet.Columns["Z:Z", System.Type.Missing]; 
ranger.Hidden = true; 
//将文件保存到D:\\tt.xls 
workbook.SaveCopyAs("D:\\111.xlsx"); 
workbook.Saved = true; 
xlApp.Visible = true;//打开Excel文件 
// ran1.Validation.Modify(Excel.XlDVType.xlValidateList, Excel.XlDVAlertStyle.xlValidAlertStop, Type.Missing, "4,3,2", Type.Missing);//用此法方（Modify）可以对前面的下拉框进行修改， 
}






 

//当使用模板时，用下面的代码替换上面的几行
object missing = Missing.Value; 

KillProcess("Excel");//首先杀死进程 
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application(); 
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks; 
//Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet); 
//Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1]; 
//Microsoft.Office.Interop.Excel.Range range = worksheet.Cells; 

//打开模板文件，得到WorkBook对象 
Microsoft.Office.Interop.Excel.Workbook workbook = xlApp.Workbooks.Open(HttpContext.Request.PhysicalApplicationPath + "Templates\\"+"IPalTempFile\\PDU资产模板1.xls", missing, missing, missing, missing, missing, 
missing,missing,missing,missing,missing,missing,missing); 
//得到WorkSheet对象 
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets.get_Item(1); 
Microsoft.Office.Interop.Excel.Range range = worksheet.Cells; 
//worksheet.Name = "过程资产平台导入建议模板";