C# 指定模板 并导出Excel

1同事一个导出excel的功能

/// <summary>
/// 每个字段为一列按顺序导出
/// 可指定不需要导出的字段名称，可通过编写委托函数设置指定名称字段的导出格式
/// 失败：抛出异常
/// </summary>
/// auto: tac
/// created date: 2016/01/25 PM
/// <exception cref="ExcelExportException"></exception>
/// <typeparam name="T"></typeparam>
/// <param name="list">要导出的数据</param>
/// <param name="templatePath">模版文件路径</param>
/// <param name="path">文件导出路径</param>
/// <param name="warningMsg">保存警告信息的字段</param>
/// <param name="unexportFiledList">不需要导出的字段列表（区分大小写）</param>
/// <param name="formatter">调用者用于格式化指定名称字段的委托函数</param>
/// <returns></returns>
public void ExportExcelFile<T>(IEnumerable<T> list, string templatePath, string path, out string warningMsg, List<string> unexportFiledList = null, FieldFormatter formatter = null)
{
var ex = new ExcelExportException();
if (!list.Any())
{
ex.ThrowThisException("无数据");
}

try
{
File.Copy(templatePath, path, true);

using (var fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
IWorkbook workbook = null;
ISheet sheet = null;

Regex xls = new Regex("\\.xls$", RegexOptions.IgnoreCase);
Regex xlsx = new Regex("\\.xlsx$", RegexOptions.IgnoreCase);
if (xls.Match(path).Length > 0)
{
// 2003版本
workbook = new HSSFWorkbook(fs);
}
else if (xlsx.Match(path).Length > 0)
{
// 2007版本
workbook = new XSSFWorkbook(fs);
}
else
{
ex.ThrowThisException("文件格式错误");
}

//创建属性的集合
List<PropertyInfo> pList = new List<PropertyInfo>();
//获得反射的入口
Type type = typeof (T);
//把所有的public属性加入到集合
Array.ForEach<PropertyInfo>(type.GetProperties(), p => pList.Add(p));

sheet = (ISheet) workbook.GetSheetAt(0);
int rowIndex = 1;
foreach (var item in list)
{
IRow dataRow = (IRow) sheet.CreateRow(rowIndex);
var col = 0;
for (int i = 0; i < pList.Count; i++)
{
//如果是不需要导出的字段，则continue
if (unexportFiledList != null && unexportFiledList.Contains(pList[i].Name))
continue;

var fieldType = pList[i].PropertyType.Name;
var fieldValue = pList[i].GetValue(item);
string txt = "";
//需要格式化特定字段
if (formatter != null)
txt = formatter(pList[i].Name, fieldValue);
else
{
txt = fieldValue.IsNull() ? "" : fieldValue.ToString();
}

dataRow.CreateCell(col).SetCellValue(txt);
col++;
}

rowIndex++;
}
//写入文件
using (FileStream stm = File.OpenWrite(path))
{
workbook.Write(stm);
}
fs.Close();
}
}
catch (Exception e)
{
ex.ThrowThisException(e.Message);
}
finally
{
warningMsg = ex.WarningMsg;
}
}

转载于:https://www.cnblogs.com/QingLang-Raymond/articles/5435430.html