最近新项目开始了，万能的excel又要上台工作。对于导出代码网上的确很多，合适的没有找到。
我们这边使用的ef + dapper 两套orm框架，他们有一个共同点，都是操作实体对象的。所以导出不能用万能的DataTable了。后面花了一些时间，集合众仙所长，写了一套单excel导入导出的方式。数据源为List<T>
public class Excel
{
/// <summary>
/// 导出到sheet中
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="path"></param>
/// <param name="list"></param>
/// <param name="sheetName"></param>
public static void Export<T>(string path, List<T> list, string sheetName = "sheet1") where T : class, new()
{
IWorkbook book = null;
//this.gridView1.ExportToXls(sflg.FileName);
//NPOI.xs book = new NPOI.HSSF.UserModel.HSSFWorkbook();
if (Path.GetExtension(path).ToLower() != ".xlsx")
{
book = new HSSFWorkbook();
}
else
{
book = new XSSFWorkbook();//07
}
ISheet sheet = book.CreateSheet("sheet");
// 添加表头
var pros = typeof(T).GetProperties();
IRow row = sheet.CreateRow(0);
int index = 0;
foreach (var p in pros)
{
string alias = AliasAttribute<T>(p);
if (!string.IsNullOrEmpty(alias))
{
ICell cell = row.CreateCell(index);
cell.SetCellType(CellType.String);
cell.SetCellValue(alias);
int num = Encoding.GetEncoding(936).GetBytes(alias).Length;
sheet.SetColumnWidth(index, num * 500);
index++;
}
}
// 添加数据
for (int i = 0; i < list.Count; i++)
{
index = 0;
row = sheet.CreateRow(i + 1);
foreach (var p in pros)
{
string alias = AliasAttribute<T>(p);
if (!string.IsNullOrEmpty(alias))
{
//var attributes = p.GetCustomAttributes(typeof(AliasAttribute), false);
//var type = (AliasAttribute)attributes[0];
object value = p.GetValue(list[i], null);
ICell cell = row.CreateCell(index);
//cell.SetCellType(CellType.String);
//cell.SetCellValue(value);
SetCellValue(cell, p, value, book);
index++;
}
}
}
// 写入
MemoryStream ms = new MemoryStream();
book.Write(ms);
using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
ms.Close();
ms.Dispose();
}
private static string AliasAttribute<T>(PropertyInfo p) where T : class, new()
{
var attributes = p.GetCustomAttributes(typeof(AliasAttribute), false);
AliasAttribute type = null;
foreach (var o in attributes)
{
if (o is AliasAttribute)
{
type = o as AliasAttribute;
}
}
return type?.Alias;
}
/// <summary>
/// 读Excel单元格的数据
/// </summary>
/// <param name="cell">Excel单元格</param>
/// <param name="type">列数据类型</param>
/// <param name="value"></param>
/// <param name="book"></param>
/// <returns>object 单元格数据</returns>
private static void SetCellValue(ICell cell, PropertyInfo type, object value, IWorkbook book)
{
string dataType = type.PropertyType.FullName;
switch (dataType)
{
case "System.String"://字符串类型
cell.SetCellValue(Convert.ToString(value));
break;
case "System.DateTime"://日期类型
ICellStyle cellDateStyle = book.CreateCellStyle();
IDataFormat format = book.CreateDataFormat();
cellDateStyle.DataFormat = format.GetFormat("yyyy-MM-dd hh:mm:ss");//yyyy-mm-dd hh:mm:ss
cell.CellStyle = cellDateStyle;
cell.SetCellValue(Convert.ToDateTime(value));
break;
case "System.Boolean"://布尔型
cell.SetCellValue(Convert.ToBoolean(value));
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
cell.SetCellValue(Convert.ToUInt64(value));
break;
case "System.Decimal"://浮点型
case "System.Double":
cell.SetCellValue(Convert.ToDouble(value));
break;
case "System.DBNull"://空值处理
cell.SetCellValue("");
break;
default:
throw (new Exception(dataType + "：类型数据无法处理!"));
}
}
/// <summary>
/// 导入
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="path"></param>
/// <param name="sheetIndex"></param>
/// <returns></returns>
public static List<T> Import<T>(string path, int sheetIndex = 0) where T : class, new()
{
List<T> list = new List<T>();
IWorkbook book;
FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
if (Path.GetExtension(path).ToLower() != ".xlsx")
{
book = new HSSFWorkbook(fs);
}
else
{
book = new XSSFWorkbook(fs);//07
}
ISheet sheet = book.GetSheetAt(sheetIndex);
IRow row = sheet.GetRow(0);
if (row == null)
return list;
int firstCellNum = row.FirstCellNum;
int lastCellNum = row.LastCellNum;
if (firstCellNum == lastCellNum)
return list;
//记录列号与属性名称对应关系
Dictionary<int, PropertyInfo> dictionary = new Dictionary<int, PropertyInfo>();
var pros = typeof(T).GetProperties();
for (int i = firstCellNum; i < lastCellNum; i++)
{
string name = row.GetCell(i).StringCellValue;
foreach (var p in pros)
{
string alias = AliasAttribute<T>(p);
if ((!string.IsNullOrEmpty(alias)) && name == alias)
{
dictionary.Add(i, p);
break;
}
}
}
for (int i = 1; i <= sheet.LastRowNum; i++)
{
T t = new T();
row = sheet.GetRow(i);
//for (int j = firstCellNum; j < lastCellNum; j++)
foreach (var info in dictionary)
{
SetValue(row.GetCell(info.Key), info.Value, t);
}
list.Add(t);
}
return list;
}
/// <summary>
/// 读Excel单元格的数据
/// </summary>
/// <param name="cell">Excel单元格</param>
/// <param name="type">列数据类型</param>
/// <param name="obj"></param>
/// <returns>object 单元格数据</returns>
private static void SetValue(ICell cell, PropertyInfo type, object obj)
{
object cellValue;
switch (cell.CellType)
{
case CellType.String: //文本
cellValue = cell.StringCellValue;
break;
case CellType.Numeric: //数值
if (cell.CellType == CellType.Numeric && DateUtil.IsCellDateFormatted(cell))
{
cellValue = cell.DateCellValue;
break;
}
cellValue = cell.NumericCellValue;
break;
case CellType.Boolean: //bool
cellValue = cell.BooleanCellValue;
break;
case CellType.Blank: //空白
cellValue = "";
break;
default:
cellValue = null;
break;
}
string dataType = type.PropertyType.FullName;
if (dataType == "System.String")
{
type.SetValue(obj, cellValue, null);
}
else if (dataType == "System.DateTime")
{
DateTime pdt = Convert.ToDateTime(cellValue);
type.SetValue(obj, pdt, null);
}
else if (dataType == "System.Boolean")
{
bool pb = Convert.ToBoolean(cellValue);
type.SetValue(obj, pb, null);
}
else if (dataType == "System.Int16")
{
Int16 pi16 = Convert.ToInt16(cellValue);
type.SetValue(obj, pi16, null);
}
else if (dataType == "System.Int32")
{
Int32 pi32 = Convert.ToInt32(cellValue);
type.SetValue(obj, pi32, null);
}
else if (dataType == "System.Int64")
{
Int64 pi64 = Convert.ToInt64(cellValue);
type.SetValue(obj, pi64, null);
}
else if (dataType == "System.Byte")
{
Byte pb = Convert.ToByte(cellValue);
type.SetValue(obj, pb, null);
}
else if (dataType == "System.Decimal")
{
System.Decimal pd = Convert.ToDecimal(cellValue);
type.SetValue(obj, pd, null);
}
else if (dataType == "System.Double")
{
double pd = Convert.ToDouble(cellValue);
type.SetValue(obj, pd, null);
}
else
{
type.SetValue(obj, null, null);
}
}
}
导出的中文名称是一个大问题，总不能把实体中的属性导出到excel中，定义中文属性又不符合”我们“的风格。没有无法解决的问题，我们用特性，看我们的大招
/// <summary>
/// 导出excel列名
/// </summary>
[AttributeUsage(AttributeTargets.Property)]
public class AliasAttribute : Attribute
{
/// <summary>
/// 属性别名
/// </summary>
public string Alias { get; }
/// <summary>
/// 构造方法
/// </summary>
/// <param name="alias">别名</param>
public AliasAttribute(string alias)
{
Alias = alias;
}
}
代码写完了，后面简单测试一下。
[TestClass]
public class ExcelTest
{
/// <summary>
/// 导出
/// </summary>
[TestMethod]
public void Export()
{
List<ExcelTestM> listExcelTestMs = new List<ExcelTestM>(100);
for (int i = 0; i < 100; i++)
{
listExcelTestMs.Add(new ExcelTestM()
{
Name = "张三" + i,
Age = i,
Address = "确认ws能够成功建立连接。如果ws无法正常建立连接，请参照",
CreateDate = DateTime.Now,
Ishides = true,
Amount = i / 1.1,
});
}
Excel.Export(@"D:\1.xlsx", listExcelTestMs);
}
/// <summary>
/// 实体中只有部分列导出
/// 如果：只导出配置的列
/// </summary>
[TestMethod]
public void ExportPart()
{
List<ExcelTestM> listExcelTestMs = new List<ExcelTestM>(100);
for (int i = 0; i < 100; i++)
{
listExcelTestMs.Add(new ExcelTestM()
{
Name = "张三" + i,
Age = i,
Address = "确认ws能够成功建立连接。如果ws无法正常建立连接，请参照",
CreateDate = DateTime.Now,
Ishides = true,
Amount = i / 1.1,
});
}
Excel.Export(@"D:\1.xlsx", listExcelTestMs);
}
/// <summary>
/// 导入
/// </summary>
[TestMethod]
public void Import()
{
var list = Excel.Import<ExcelTestM>(@"D:\1.xlsx");
}
/// <summary>
/// 导入
/// 1、EXCEL列多于实体
/// 2、实体列多于EXCEL
/// 结果：取实体与EXCEL的交集
/// </summary>
[TestMethod]
public void ImportPart()
{
//1、EXCEL列多于实体
var list = Excel.Import<ExcelTestM>(@"D:\1.xlsx");
//2、实体列多于EXCEL
list = Excel.Import<ExcelTestM>(@"D:\1.xlsx");
}
}
/// <summary>
/// excel测试实体
/// </summary>
public class ExcelTestM
{
/// <summary>
/// 姓名
/// </summary>
[Alias("姓名")]
public string Name { get; set; }
/// <summary>
/// 年龄
/// </summary>
[Alias("年龄")]
public int Age { get; set; }
/// <summary>
/// 地址
/// </summary>
[Alias("地址1111111111111111")]
public string Address { get; set; }
[Alias("日期")]
public DateTime CreateDate { get; set; }
public bool Ishides { get; set; }
//[Alias("数据啊啊啊")]
public double Amount { get; set; }
}
感谢你能耐心的看到最后，这些代码没有添加错误处理，你在使用时，可以直接获取到错误信息，以提示用户。
原文地址：https://www.cnblogs.com/ypeuee/p/8952546.html
时间： 2024-10-26 04:54:15