最近在做一個匯出模板的功能，需要限制使用者的某些單元格輸入的內容。

期望達到的效果：單元格中出現下拉選擇，或輸入錯誤時提示。

翻閱了許多資料，終於得到了答案。

然後自己整理下邊一些方法，記錄下來方便以後使用。

第一種

· 直接設定下拉值，不超過255個字元（優點：邏輯簡單 ；缺點：有字元限制）

· 適用於下拉值為固定值，例如：狀態、性別等

方法塊：

public static void SetCellDropdownList(ISheet sheet, int firstcol, int lastcol, string[] vals)
{
     //設定生成下拉框的行和列
     var cellRegions = new CellRangeAddressList(1, 65535, firstcol, lastcol);

     //設定 下拉框內容
     DVConstraint constraint = DVConstraint.CreateExplicitListConstraint(vals);

     //繫結下拉框和作用區域，並設定錯誤提示資訊
     HSSFDataValidation dataValidate = new HSSFDataValidation(cellRegions, constraint);
     dataValidate.CreateErrorBox("輸入不合法", "請輸入或選擇下拉列表中的值。");
     dataValidate.ShowPromptBox = true;

     sheet.AddValidationData(dataValidate);
}
 

呼叫：

HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1");
ExcelHelper.SetCellDropdownList(sheet, 1, 1, new List<string>() { "男", "女", "保密" }.ToArray());

第二種

· 通過繫結值到sheet中設定下拉

· 適用於資料較多，或靈活控制的值，例如：城市區域、資料表資訊等。

方法塊：

public static void SetCellDropdownList(HSSFWorkbook workbook, ISheet sheet, string name, int firstcol, int lastcol, string[] vals, int sheetindex = 1)
{
      //先建立一個Sheet專門用於儲存下拉項的值
      ISheet sheet2 = workbook.CreateSheet(name);
      //隱藏
      workbook.SetSheetHidden(sheetindex, true);
      int index = 0;
      foreach (var item in vals)
      {
          sheet2.CreateRow(index).CreateCell(0).SetCellValue(item);
          index++;
      }
      //建立的下拉項的區域：
      var rangeName = name + "Range";
      IName range = workbook.CreateName();
      range.RefersToFormula = name + "!$A$1:$A$" + index;
      range.NameName = rangeName;
      CellRangeAddressList regions = new CellRangeAddressList(0, 65535, firstcol, lastcol);

      DVConstraint constraint = DVConstraint.CreateFormulaListConstraint(rangeName);
      HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
      dataValidate.CreateErrorBox("輸入不合法", "請輸入或選擇下拉列表中的值。");
      dataValidate.ShowPromptBox = true;
      sheet.AddValidationData(dataValidate);
}
 

呼叫：

HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1");
var roomTypeList = GetRoomTypeNameList();
ExcelHelper.SetCellDropdownList(workbook, sheet, "RoomTypeDictionary", 1, 1, roomTypeList.ToArray());

另外，延伸聯動下拉（直接貼原始碼了）

方法塊：

private void SetCityCellDropdownList(HSSFWorkbook workbook, ISheet sheet, string dictionaryName, int citycol, int areacol, int sheetIndex)
{
	var citylist = GetCityList();
	int citycount = citylist.Count;
	ISheet sheet2 = workbook.CreateSheet(dictionaryName);
	//隱藏
	workbook.SetSheetHidden(sheetIndex, true);

	#region 城市區域資料構造
	//城市
	int rowIndex = 0;
	foreach (var item in citylist)
	{
		IRow row = sheet2.CreateRow(rowIndex);
		row.CreateCell(0).SetCellValue(item.Name);

		rowIndex++;
	}
	//區域
	int n_rowIndex = 0;
	foreach (var item in citylist)
	{
		int areaIndex = 0;
		foreach (var area in item.AreaList)
		{
			IRow row = sheet2.GetRow(areaIndex);
			if (row == null)
			{
				row = sheet2.CreateRow(areaIndex);
			}
			row.CreateCell(n_rowIndex + 1).SetCellValue(area.Name);
			areaIndex++;
		}
		n_rowIndex++;
	}
	#endregion

	#region 設定資料欄位範圍
	//定義城市
	int columnIndex = 1;
	IName range_Country = workbook.CreateName();
	range_Country.RefersToFormula = string.Format("{0}!${1}$1:${1}${2}", dictionaryName, GetExcelColumnName(columnIndex), citycount);
	range_Country.NameName = "城市";

	//定義區
	foreach (var item in citylist)
	{
		int areacount = item.AreaList.Count;
		columnIndex++;
		IName range_area = workbook.CreateName();
		range_area.RefersToFormula = string.Format("{0}!${1}$1:${1}${2}", dictionaryName, GetExcelColumnName(columnIndex), areacount);
		range_area.NameName = item.Name;
	}

	//城市列表下拉繫結
	ExcelHelper.SetCellDropdownList(sheet, 1, 65535, citycol, citycol, "城市");

	//第二列，跟隨第一列聯動
	string colName = GetExcelColumnName(areacol);
	for (int j = 1; j < 500; j++)
	{
		ExcelHelper.SetCellDropdownList(sheet, j, j, areacol, areacol, string.Format("INDIRECT(${0}${1})", colName, j + 1));
	}
	#endregion
}

private string GetExcelColumnName(int columnNumber)
{
	int dividend = columnNumber;
	string columnName = String.Empty;
	int modulo;

	while (dividend > 0)
	{
		modulo = (dividend - 1) % 26;
		columnName = Convert.ToChar(65 + modulo).ToString() + columnName;
		dividend = (int)((dividend - modulo) / 26);
	}

	return columnName;
}
 

public static void SetCellDropdownList(ISheet sheet, int firstRow, int lastRow, int firstCol, int lastCol, string name)
{
	CellRangeAddressList regions = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);
	DVConstraint constraint = DVConstraint.CreateFormulaListConstraint(name);
	HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
	dataValidate.CreateErrorBox("輸入不合法", "請輸入或選擇下拉列表中的值。");
	sheet.AddValidationData(dataValidate);
}

HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1");
SetCityCellDropdownList(workbook, sheet, "CityDictionary", 1, 2, 1);