C#Excel导出反射数据集

/// <summary>
/// 导出任务清单树木
/// </summary>
/// <param name="transplantId">移栽任务编号</param>
/// <returns></returns>
public ActionResult ExportFrom(string transplantId)
{
var conditions = PredicateExtensions.True<V_TranspLantTreeExport>();

if (!string.IsNullOrEmpty(transplantId))
{
conditions = conditions.And(s => s.transplantId.Contains(transplantId));
}
List<V_TranspLantTreeExport> lstTreeList = _repo.FindAll(conditions).ToList();
for (int i = 0; i < lstTreeList.Count; i++)
{
lstTreeList[i].rowNum = i + 1;
}
try
{
// 2.设置单元格抬头
// key：实体对象属性名称，可通过反射获取值
// value：Excel列的名称
Dictionary<string, string> cellheader = new Dictionary<string, string> {

{ "rowNum", "序号" },
{ "CertCode", "开挖证号" },
{ "FromPlace", "起挖地" },
{ "ToPlace", "种植地" },
{ "TreeSpecies", "树种" },
{ "TreeDiameter", "胸径" },
{ "TreeWidth", "蓬径" },
{ "Unit", "单位" },
{ "num", "数量" },
{ "MoveInDeviceLat", "起挖地X轴" },
{ "MoveInDeviceLon", "起挖地Y轴" },
{ "MoveOutDeviceLat", "种植地X轴" },
{ "MoveOutDeviceLon", "种植地Y轴" },
{ "CreateDate","创建时间"},
};

// 3.进行Excel转换操作
return EntityListToExcel2003(cellheader, lstTreeList, "移栽任务苗木明细");
}
catch (Exception ex)
{
throw ex;
}

}

/// <summary>
/// 实体类集合导出到Excle2003
/// </summary>
/// <param name="cellHeard">单元头的Key和Value</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 ActionResult EntityListToExcel2003(Dictionary<string, string> cellHeard, IList enList, string sheetName)
{
try
{
string fileName = sheetName + "-" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls"; // 文件名称
string urlPath = "UploadFiles/ExcelFiles/" + fileName; // 文件下载的URL地址，供给前台下载
//string filePath = Server.MapPath("\" + urlPath); // 文件路径
string filePath = AppDomain.CurrentDomain.BaseDirectory + urlPath;
// 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();
FilePathResult fpr = new FilePathResult(filePath, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
fpr.FileDownloadName = fileName;
return fpr;
// 5.返回下载路径
// return urlPath;
}
catch (Exception ex)
{
throw ex;
}
}