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for (int i = 0; i < dt.Rows.Count; i++)
{
dataRow = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell icell = dataRow.CreateCell(j);
icell.SetCellValue(dt.Rows[i][j].ToString());
icell.CellStyle = style;
if (i != 0 && dt.Rows[i][0].ToString() == dt.Rows[i - 1][0].ToString())
{
string a3 = dt.Rows[i][j].ToString();
string a4 = dt.Rows[i - 1][j].ToString();
if (( dt.Rows[i][j].ToString() != dt.Rows[i - 1][j].ToString()) || Array.IndexOf(key, j) != -1)
{
//CellRangeAddress(合并单元格)四个参数为:起始行,结束行,起始列,结束列
icell = sheet.CreateRow(i).CreateCell(j);
icell.SetCellValue(dt.Rows[i-1][j].ToString() + "\n" + dt.Rows[i][j].ToString());
icell.CellStyle = style;
}
string a1 = sheet.GetRow(i).GetCell(j).ToString();
string a2 = sheet.GetRow(i+1).GetCell(j).ToString(); //不合并这里就是null,我的赋值语句在合并外面,怎么会这样
sheet.AddMergedRegion(new CellRangeAddress(i, i + 1, j, j));
}
}
}
//填充内容
for (int i = 0; i < dt.Rows.Count; i++)
{
dataRow = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
if (i != 0 &&dt.Rows[i][j].ToString() == dt.Rows[i - 1][j].ToString())
{
ICell ice = sheet.CreateRow(i + 1).CreateCell(j);
ice.SetCellValue("");
ice.CellStyle = style;
sheet.AddMergedRegion(new CellRangeAddress(i, i + 1, j, j));
}
else
{
ICell icell = dataRow.CreateCell(j);
icell.SetCellValue(dt.Rows[i][j].ToString());
icell.CellStyle = style;
}
}
}
Dictionary<string, string> cellheader = new Dictionary<string, string> {
{ "StudentId", "学员编号" },
{ "StuName", "学员姓名" },
{ "Mobile", "手机号" },
{ "OrderNUM", "订单号" },
{ "ProductPrice", "商品原价" },
{ "AmountPayable", "商品售价" },
{ "PayType", "订单类型" },
{ "Prices", "实付" },
{ "ExpireTime", "有效期" },
{ "PayTime", "支付时间" },
{ "Status", "状态" }
};
// 3.进行Excel转换操作,并返回转换的文件下载链接
string urlPath = ExcelHelper.EntityListToExcel2003(cellheader, resJson.ToList(), "学生成绩");
public class ExcelHelper
{
/// <summary>
/// 实体类集合导出到Excle2003
/// </summary>
/// <param name="cellHeard">单元头的Key和Value:{ { "UserName", "姓名" }, { "Age", "年龄" } };</param>
/// <param name="enList">数据源</param>
/// <param name="sheetName">工作表名称</param>
/// <returns>文件的下载地址</returns>
public static string EntityListToExcel2003(Dictionary<string, string> cellHeard, IList enList, string sheetName)
{
try
{
string fileName = sheetName + "-" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls"; // 文件名称
string urlPath = "UpFiles/ExcelFiles/" + fileName; // 文件下载的URL地址,供给前台下载
string filePath = HttpContext.Current.Server.MapPath("\\" + urlPath); // 文件路径
// 1.检测是否存在文件夹,若不存在就建立个文件夹
string directoryName = Path.GetDirectoryName(filePath);
if (!Directory.Exists(directoryName))
{
Directory.CreateDirectory(directoryName);
}
// 2.解析单元格头部,设置单元头的中文名称
HSSFWorkbook workbook = new HSSFWorkbook(); // 工作簿
ISheet sheet = workbook.CreateSheet(sheetName); // 工作表
IRow row = sheet.CreateRow(0);
List<string> keys = cellHeard.Keys.ToList();
for (int i = 0; i < keys.Count; i++)
{
row.CreateCell(i).SetCellValue(cellHeard[keys[i]]); // 列名为Key的值
}
// 3.List对象的值赋值到Excel的单元格里
int rowIndex = 1; // 从第二行开始赋值(第一行已设置为单元头)
foreach (var en in enList)
{
IRow rowTmp = sheet.CreateRow(rowIndex);
for (int i = 0; i < keys.Count; i++) // 根据指定的属性名称,获取对象指定属性的值
{
string cellValue = ""; // 单元格的值
object properotyValue = null; // 属性的值
System.Reflection.PropertyInfo properotyInfo = null; // 属性的信息
// 3.1 若属性头的名称包含'.',就表示是子类里的属性,那么就要遍历子类,eg:UserEn.UserName
if (keys[i].IndexOf(".") >= 0)
{
// 3.1.1 解析子类属性(这里只解析1层子类,多层子类未处理)
string[] properotyArray = keys[i].Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries);
string subClassName = properotyArray[0]; // '.'前面的为子类的名称
string subClassProperotyName = properotyArray[1]; // '.'后面的为子类的属性名称
System.Reflection.PropertyInfo subClassInfo = en.GetType().GetProperty(subClassName); // 获取子类的类型
if (subClassInfo != null)
{
// 3.1.2 获取子类的实例
var subClassEn = en.GetType().GetProperty(subClassName).GetValue(en, null);
// 3.1.3 根据属性名称获取子类里的属性类型
properotyInfo = subClassInfo.PropertyType.GetProperty(subClassProperotyName);
if (properotyInfo != null)
{
properotyValue = properotyInfo.GetValue(subClassEn, null); // 获取子类属性的值
}
}
}
else
{
// 3.2 若不是子类的属性,直接根据属性名称获取对象对应的属性
properotyInfo = en.GetType().GetProperty(keys[i]);
if (properotyInfo != null)
{
properotyValue = properotyInfo.GetValue(en, null);
}
}
// 3.3 属性值经过转换赋值给单元格值
if (properotyValue != null)
{
cellValue = properotyValue.ToString();
// 3.3.1 对时间初始值赋值为空
if (cellValue.Trim() == "0001/1/1 0:00:00" || cellValue.Trim() == "0001/1/1 23:59:59")
{
cellValue = "";
}
}
// 3.4 填充到Excel的单元格里
rowTmp.CreateCell(i).SetCellValue(cellValue);
}
rowIndex++;
}
// 4.生成文件
FileStream file = new FileStream(filePath, FileMode.Create);
workbook.Write(file);
file.Close();
// 5.返回下载路径
return urlPath;
}
catch (Exception ex)
{
throw ex;
}
}
}