NPOI
public static class ExcelHelper
{
/// <summary>
/// 导入Excel为 TList 支持自定义列
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="strFileName"><文件名/param>
/// <param name="sheetIndex">需要读取的Sheet页</param>
/// <param name="titleDictionaries">自定义数据列</param>
/// <returns></returns>
public static List<T> ExcelToList<T>(Type instanceType, string strFileName, int sheetIndex = 0, bool haveTitles = false, Dictionary<string, string> titleDic = null) where T : class, new()
{
PropertyInfo[] myPropertyInfo = instanceType.GetProperties(BindingFlags.Public | BindingFlags.Instance); //获取所有属性
List<T> tList = new List<T>();
var propertys = typeof(T).GetProperties();
HSSFWorkbook hssfworkbook = null;
XSSFWorkbook xssfworkbook = null;
string fileExt = Path.GetExtension(strFileName); //获取文件的后缀名
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
if (fileExt == ".xls")
hssfworkbook = new HSSFWorkbook(file);
else if (fileExt == ".xlsx")
xssfworkbook = new XSSFWorkbook(file); //初始化太慢了，不知道这是什么bug
}
if (hssfworkbook != null)
{
HSSFSheet sheet = (HSSFSheet)hssfworkbook.GetSheetAt(sheetIndex);
if (sheet != null)
{
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
if (haveTitles)
{
HSSFRow headerRow = (HSSFRow)sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
HSSFCell cell = (HSSFCell)headerRow.GetCell(j); //获取Excel标题
}
}
for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
HSSFRow row = (HSSFRow)sheet.GetRow(i);
var obj = new T();
for (int j = row.FirstCellNum; j < row.LastCellNum; j++)
{
string cellValue = "";
if (row.GetCell(j) != null)
{
cellValue = row.GetCell(j).ToString();
string dkey = titleDic.Keys.ToArray()[j];
string dataType = (myPropertyInfo[j].PropertyType).FullName; //获取数据类型
foreach (var p in propertys)
{
string name = p.Name;
if (name == dkey)
{
if (dataType == "System.String")
{
p.SetValue(obj, cellValue, null);
}
else if (dataType == "System.DateTime")
{
DateTime pdt = Convert.ToDateTime(cellValue);
p.SetValue(obj, pdt, null);
}
else if (dataType == "System.Boolean")
{
bool pb = Convert.ToBoolean(cellValue);
p.SetValue(obj, pb, null);
}
else if (dataType == "System.Int16")
{
Int16 pi16 = Convert.ToInt16(cellValue);
p.SetValue(obj, pi16, null);
}
else if (dataType == "System.Int32")
{
Int32 pi32 = Convert.ToInt32(cellValue);
p.SetValue(obj, pi32, null);
}
else if (dataType == "System.Int64")
{
Int64 pi64 = Convert.ToInt64(cellValue);
p.SetValue(obj, pi64, null);
}
else if (dataType == "System.Byte")
{
Byte pb = Convert.ToByte(cellValue);
p.SetValue(obj, pb, null);
}
else if (dataType == "System.Decimal")
{
System.Decimal pd = Convert.ToDecimal(cellValue);
p.SetValue(obj, pd, null);
}
else if (dataType == "System.Double")
{
double pd = Convert.ToDouble(cellValue);
p.SetValue(obj, pd, null);
}
else
{
p.SetValue(obj, null, null);
}
}
}
}
}
tList.Add(obj);
}
}
}
else if (xssfworkbook != null)
{
XSSFSheet xSheet = (XSSFSheet)xssfworkbook.GetSheetAt(sheetIndex);
if (xSheet != null)
{
System.Collections.IEnumerator rows = xSheet.GetRowEnumerator();
if (haveTitles)
{
XSSFRow headerRow = (XSSFRow)xSheet.GetRow(0);
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
XSSFCell cell = (XSSFCell)headerRow.GetCell(j); //获取Excel标题
}
}
for (int i = (xSheet.FirstRowNum + 1); i <= xSheet.LastRowNum; i++)
{
XSSFRow row = (XSSFRow)xSheet.GetRow(i);
var obj = new T();
for (int j = row.FirstCellNum; j < row.LastCellNum; j++)
{
string value = "";
if (row.GetCell(j) != null)
{
value = row.GetCell(j).ToString();
string dkey = titleDic.Keys.ToArray()[j];
string dvalue = titleDic.Values.ToArray()[j];
string str = (myPropertyInfo[j].PropertyType).FullName; //获取数据类型
foreach (var p in propertys)
{
string name = p.Name;
if (name == dkey)
{
if (str == "System.String")
{
p.SetValue(obj, value, null);
}
else if (str == "System.DateTime")
{
DateTime pdt = Convert.ToDateTime(value);
p.SetValue(obj, pdt, null);
}
else if (str == "System.Boolean")
{
bool pb = Convert.ToBoolean(value);
p.SetValue(obj, pb, null);
}
else if (str == "System.Int16")
{
Int16 pi16 = Convert.ToInt16(value);
p.SetValue(obj, pi16, null);
}
else if (str == "System.Int32")
{
Int32 pi32 = Convert.ToInt32(value);
p.SetValue(obj, pi32, null);
}
else if (str == "System.Int64")
{
Int64 pi64 = Convert.ToInt64(value);
p.SetValue(obj, pi64, null);
}
else if (str == "System.Byte")
{
Byte pb = Convert.ToByte(value);
p.SetValue(obj, pb, null);
}
else if (str == "System.Decimal")
{
System.Decimal pd = Convert.ToDecimal(value);
p.SetValue(obj, pd, null);
}
else if (str == "System.Double")
{
double pd = Convert.ToDouble(value);
p.SetValue(obj, pd, null);
}
else
{
p.SetValue(obj, null, null);
}
}
}
}
}
tList.Add(obj);
}
}
}
return tList;
}
#region ListToExcel<T>(List<T> myList, string saveFileName = null, bool isOpen = false,string saveFilePath = null, string strHeaderText = null, Dictionary<string, string> titleDictionaries = null) List导出到Excel文件--C/S
/// <summary>
/// C/S List导出数据到Excel
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="myList">需要导出的泛型List</param>
/// <param name="saveFileName">保存的文件名称，默认没有，调用的时候最好加上，中英文都支持</param>
/// <param name="isOpen">导出后是否打开文件和所在文件夹</param>
/// <param name="saveFilePath">默认保存在“我的文档”中，可自定义保存的文件夹路径</param>
/// <param name="strHeaderText">Excel中第一行的标题文字，默认没有，可以自定义</param>
/// <param name="titleDictionaries">Excel中需要导出的列的字典映射，默认绑定List的列名</param>
public static void ListToExcel<T>(List<T> myList, string saveFileName = null, bool isOpen = false,
string saveFilePath = null, string strHeaderText = null, Dictionary<string, string> titleDic = null)
{
using (MemoryStream ms = ListToExcel(myList, strHeaderText, titleDic))
{
if (string.IsNullOrEmpty(saveFileName)) //文件名为空
{
saveFileName = DateTime.Now.Ticks.ToString();
}
if (string.IsNullOrEmpty(saveFilePath) || !Directory.Exists(saveFilePath)) //保存路径为空或者不存在
{
saveFilePath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); //默认在文档文件夹中
}
string saveFullPath = saveFilePath + "\\" + saveFileName + ".xls";
if (File.Exists(saveFullPath)) //验证文件重复性
{
saveFullPath = saveFilePath + "\\" + saveFileName +
DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss").Replace(":", "-").Replace(" ", "-") +
".xls";
}
using (FileStream fileStream = new FileStream(saveFullPath, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fileStream.Write(data, 0, data.Length);
fileStream.Flush();
}
if (isOpen)
{
Process.Start(saveFilePath); //打开文件夹
Process.Start(saveFullPath); //打开文件
}
}
}
#endregion
/// <summary>
/// List导出到Excel的MemoryStream
/// </summary>
/// <param name="list">需要导出的泛型List</param>
/// <param name="strHeaderText">第一行标题头</param>
/// <param name="titleDictionaries">列名称字典映射</param>
/// <returns>内存流</returns>
private static MemoryStream ListToExcel<T>(List<T> list, string strHeaderText = null,
Dictionary<string, string> titleDic = null)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "文件作者信息"; //填加xls文件作者信息
si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
si.Comments = "作者信息"; //填加xls文件作者信息
si.Title = "标题信息"; //填加xls文件标题信息
si.Subject = "主题信息"; //填加文件主题信息
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
HSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle();
HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列宽
//通过反射得到对象的属性集合
PropertyInfo[] myPropertyInfo = list.First().GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
int fieldsCount = myPropertyInfo.Length;
int[] arrColWidth = new int[fieldsCount];
int index = 0;
foreach (var item in myPropertyInfo)
{
arrColWidth[index] = Encoding.GetEncoding(936).GetBytes(item.Name).Length;
index++;
}
for (int i = 0; i < list.Count; i++)
{
for (int j = 0; j < fieldsCount; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes((myPropertyInfo[j].GetValue(list[i])).ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = 0;
bool flag = false;
for (int row = -1; row < list.Count; row++)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = (HSSFSheet)workbook.CreateSheet();
}
#region 表头及样式
if (!string.IsNullOrEmpty(strHeaderText))
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
font.FontName = "宋体";
headStyle.SetFont(font);
headerRow.GetCell(0).CellStyle = headStyle;
rowIndex++;
}
#endregion
#region 列头及样式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(rowIndex);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 14;
font.Boldweight = 500;
font.FontName = "宋体";
headStyle.SetFont(font);
Type myType = list[0].GetType();
int cn = 0;
if (titleDic.Count != 0)
{
foreach (string titleDictionary in titleDic.Keys)
{
PropertyInfo p = myType.GetProperty(titleDictionary);
if (p != null)
{
headerRow.CreateCell(cn).SetCellValue(titleDic[titleDictionary]);
headerRow.GetCell(cn).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(cn, (arrColWidth[cn] + 1) * 500);
}
cn++;
}
}
else
{
int colIndex = 0;
foreach (var column in myPropertyInfo)
{
headerRow.CreateCell(colIndex).SetCellValue(column.Name);
headerRow.GetCell(colIndex).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(colIndex, (arrColWidth[colIndex] + 1) * 500);
colIndex++;
}
}
rowIndex++;
}
#endregion
}
#endregion
#region 填充内容
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
if (flag)
{
for (int j = 0; j < fieldsCount; j++)
{
HSSFCell newCell = (HSSFCell)dataRow.CreateCell(j);
if (titleDic.ContainsKey((myPropertyInfo[j]).Name))
{
string drValue = (myPropertyInfo[j].GetValue(list[row])).ToString();
switch (((myPropertyInfo[j]).PropertyType).FullName)
{
case "System.String": //字符串类型
newCell.SetCellValue(drValue);
break;
case "System.DateTime": //日期类型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle; //格式化显示
break;
case "System.Boolean": //布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16": //整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal": //浮点型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull": //空值处理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}
}
}
}
else
{
rowIndex--;
}
flag = true;
#endregion
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
//sheet.Dispose();
//workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
return ms;
}
}
}
1.在此对原作者说声抱歉，本人忘记在哪看到的拿过来用了，所以无法声明原链接；
2.如果有朋友使用，请注意，该类有些细节上的小问题需要个人修改，请宽恕我没有提供修改后的代码；
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