/// <summary>
/// 将 exportable 中的数据连接到当前 sheet 中
/// 调用顺序: NewExcel() -> NewSheet() -> Union() -> WriteTo() -> CloseExcel().
/// </summary>
/// <param name="header">导出对象头.</param>
/// <param name="callback">导出回调.</param>
/// <returns>
/// this, 以支持链式操作.
/// </returns>
public Exporter UnionHeader(IExportHeader header, ExportCallback callback)
{
//ExportCallback exportCallback = callback;
var context = this._context;
if (context == null)
{
throw new Exception("请先调用 NewExcel()");
}
var sheet = context.Sheet;
if (sheet == null)
{
throw new Exception("请先调用 NewSheet()");
}
var y = context.StartRowIndex;
IRow row = null;
int columnIndex = 0, x = 0;
context.RowIndex = 0;
context.CellType = CellType.HeaderCell;
while (true)
{
context.Reset();
context.ColumnIndex = columnIndex;
if (header.NextHeaderCell(columnIndex, context))
{
if (callback != null)
{
callback(context);
}
if (context.IsValid)
{
// 创建单元格
if (row == null)
{
row = sheet.CreateRow(y++);
}
var cell = row.CreateCell(x++);
// 设置单元格
SetCell(cell, context);
}
++columnIndex;
}
else
{
break;
}
}
context.StartRowIndex = y;
return(this);
}
/// <summary>
/// Initializes a new instance of the <see cref="PagedExportable"/> class.
/// </summary>
/// <param name="header">导出头.</param>
/// <param name="target">包含要导出数据的 Exportable.</param>
/// <param name="pageSize">分页大小.</param>
public PagedExportable(IExportHeader header, IExportable target, int pageSize)
{
if (target == null) throw new ArgumentNullException("target");
if (pageSize < 1 || pageSize > 65536) throw new ArgumentOutOfRangeException("pageSize");
this._header = header;
this._target = target;
this._pageSize = pageSize;
this._startIndex = 0;
}
