Excel导出下拉框（导出下拉框较少的选项）

一、导出下拉框较少的选项

　Dictionary<int, DataTable> dicDropList   key 下拉框列Index，value 下拉数据，为了支持一个sheet有多个下拉

if (dicDropList != null)
{
foreach (var item in dicDropList)
{
CellRangeAddressList regions = new CellRangeAddressList(1, 65535, item.Key, item.Key);
string[] temp = new string[item.Value.Rows.Count];
int i = 0;
foreach (DataRow dr in item.Value.Rows)
{
temp[i] = dr[0].ToString();//字段
i++;
}
DVConstraint constraint = DVConstraint.CreateExplicitListConstraint(temp);
HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
dataValidate.CreateErrorBox("输入不合法", "请输入下拉列表中的值。");
sheet.AddValidationData(dataValidate);
}
}

例子：

/// <summary>
///
/// </summary>
/// <param name="dtData">要导出的数据</param>
/// <param name="dtColumn">列名称</param>
/// <param name="excelTitle">导出后显示列名称</param>
/// <param name="path"></param>
/// <param name="fileName"></param>
/// <param name="mustCoulums">主表列</param>
/// <param name="dicDropList">下拉框集合</param>
/// <param name="hideCoulums">隐藏列</param>

public static void DataTableToExcel(DataTable dtData, string[] dtColumn, String[] excelTitle, string path, string fileName, string[] mustCoulums, Dictionary<int, DataTable> dicDropList = null, string[] hideCoulums = null)
{
IWorkbook hssfworkbook = null;
ISheet sheet = null;
string cellValue = "";

if (fileName == "")
{
fileName = "代采付款记录" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls"; //默认名称和版本
}
fileName = path + "\" + fileName;
if (Path.GetExtension(fileName) == ".xls")//2003 版本
{
hssfworkbook = new HSSFWorkbook();
}
else if (Path.GetExtension(fileName) == ".xlsx") //2007及以上版本
{
hssfworkbook = new XSSFWorkbook();
}
#region 此为主簿
sheet = hssfworkbook.CreateSheet("Sheet1");
//创建表头行
IRow rowMainName = sheet.CreateRow(0);
if (excelTitle.Length > 0)
{
for (int i = 0; i < excelTitle.Length; i++)
{
ICell cellDetailHead = rowMainName.CreateCell(i);
if (mustCoulums.Contains<string>(excelTitle[i].ToString()))
{
//HSSFCellStyle fCellStyle = (HSSFCellStyle)hssfworkbook.CreateCellStyle();
cellDetailHead.CellStyle = gFunc.Getcellstyle(hssfworkbook, gIEnum.Stylexls.Title, "main");
}
else
{
cellDetailHead.CellStyle = gFunc.Getcellstyle(hssfworkbook, gIEnum.Stylexls.Title);
}
cellDetailHead.SetCellValue(excelTitle[i]);
}
}
int rowIndex = 0;

if (dicDropList != null)
{
foreach (var item in dicDropList)
{
CellRangeAddressList regions = new CellRangeAddressList(1, 65535, item.Key, item.Key);
string[] temp = new string[item.Value.Rows.Count];
int i = 0;
foreach (DataRow dr in item.Value.Rows)
{
temp[i] = dr[0].ToString();//字段
i++;
}
DVConstraint constraint = DVConstraint.CreateExplicitListConstraint(temp);
HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
dataValidate.CreateErrorBox("输入不合法", "请输入下拉列表中的值。");
sheet.AddValidationData(dataValidate);
}
}
//创建明细行
if (dtData != null)
{
for (int i = 0; i < dtData.Rows.Count; i++)
{
rowIndex = rowIndex + 1;
IRow rowDetailItem = sheet.CreateRow(rowIndex);
for (int j = 0; j < dtColumn.Length; j++)
{

ICell cellDetailItem = rowDetailItem.CreateCell(j);
cellDetailItem.CellStyle = gFunc.Getcellstyle(hssfworkbook, gFunc.DataTypeOfTypeForStyle(dtData.Columns[dtColumn[j]].DataType, dtColumn[j]));
cellValue = dtData.Rows[i][dtColumn[j]].ToString();
cellDetailItem.SetCellValue(cellValue);
}
}
}
//自动适应大小
for (int i = 0; i < excelTitle.Length; i++)
{
sheet.AutoSizeColumn(i);
}

#endregion
//影藏列
if (hideCoulums != null && hideCoulums.Length > 0)
{
foreach (string item in hideCoulums)
{
for (int j = 0; j < excelTitle.Length; j++)
{
if (item == excelTitle[j])
{
sheet.SetColumnHidden(j, true);
}
}
}
}

//保存
FileStream fi = new FileStream(fileName, FileMode.Create);
hssfworkbook.Write(fi);
fi.Dispose();
}