/// <summary>
/// EXCEL表頭
/// </summary>
/// <param name="ews">excel work sheet</param>
/// <param name="colIdx">column index</param>
/// <param name="prop">物件屬性</param>
private void AddHeader(ref ExcelWorksheet ews, ref int colIdx, PropertyInfo prop)
{
ExcelRange cell = ews.Cells[1, colIdx];
// 預設以屬性ExcelColumnAttribute Title 為表頭，若無此Attribute，則使用原始欄位名稱
ExcelColumnAttribute diaplay = prop.GetCustomAttributes(typeof(ExcelColumnAttribute), true)
.Cast <ExcelColumnAttribute>()
.SingleOrDefault();
cell.Value =
diaplay != null && !diaplay.Title.IsNullOrEmpty() ? diaplay.Title :
!prop.GetDisplayName().IsNullOrEmpty() ? prop.GetDisplayName() :
prop.Name;
cell.Style.Font.Bold = true;
cell.Style.VerticalAlignment = ExcelVerticalAlignment.Bottom;
colIdx++;
}
/// <summary>
/// 將資料集合轉換成EXCEL，於控制器 return this.File(excelStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "***.xlsx");
/// </summary>
/// <typeparam name="T">物件類型</typeparam>
/// <param name="sheetList">資料集合</param>
/// <returns>輸出EXCEL資料串流</returns>
public Stream ConvertToFile <T>(List <ExcelExportModel <T> > sheetList)
where T : class
{
using (ExcelPackage ep = new ExcelPackage())
{
foreach (ExcelExportModel <T> sheet in sheetList)
{
// 資料表名稱不可重複，且要有資料才執行。
if (ep.Workbook.Worksheets.All(x => x.Name != sheet.SheetTitle) && sheet.Datas != null)
{
ExcelWorksheet ews = ep.Workbook.Worksheets.Add(sheet.SheetTitle);
// 取Datas屬性資訊
PropertyInfo[] props = sheet.Datas.GetType().GetGenericArguments()[0].GetProperties();
List <int> wrapColIdx = new List <int>();
// 表頭設定
int headerColIdx = 1;
foreach (PropertyInfo prop in props)
{
ExcelColumnAttribute excelColunm =
prop.GetCustomAttributes(typeof(ExcelColumnAttribute), true)
.Cast <ExcelColumnAttribute>()
?.SingleOrDefault();
// 完全沒設定屬性已預設欄位名稱，有設定屬性要檢查是否顯示。
if (excelColunm == null || excelColunm.IsExportShow)
{
this.AddHeader(ref ews, ref headerColIdx, prop);
}
}
// 設定內容
int rowIdx = 2;
foreach (T data in sheet.Datas)
{
int contentColIdx = 1;
foreach (PropertyInfo prop in props)
{
ExcelColumnAttribute excelColunm = prop.GetCustomAttributes(typeof(ExcelColumnAttribute), true)
.Cast <ExcelColumnAttribute>()
.SingleOrDefault();
if (excelColunm == null || excelColunm.IsExportShow)
{
this.AddColunm(ref ews, ref rowIdx, ref contentColIdx, ref wrapColIdx, data, prop);
}
}
rowIdx++;
}
// 自動欄寬
ews.Cells[ews.Dimension.Address].AutoFitColumns();
}
}
MemoryStream stream = new MemoryStream();
ep.SaveAs(stream);
stream.Position = 0;
return(stream);
}
}
