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@@ -75,22 +75,24 @@ public class ExcelWriter : IDisposable
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}
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}
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- private static void Write<T>(IEnumerable<T> values, IXLWorksheet worksheet, bool append, uint? headerRowIndex = null) where T : class
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+ private static void Write<T>(IEnumerable<T> values, IXLWorksheet worksheet, bool append, uint? headerRowIndex = null, uint? appendFrom = null) where T : class
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{
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- if (!values.Any()) return;
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-
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- int? rowIndex;
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var properties = typeof(T).GetProperties();
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List<Mapping>? mapping = [];
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+ var rowIndex = (append, startFrom: appendFrom) switch
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+ {
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+ (true, not null) => (int)appendFrom,
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+ (true, null) => worksheet.LastRowUsed()?.RowNumber() + 1,
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+ _ => GenerateHeader(worksheet, properties)
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+ };
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+
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if (append)
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{
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- rowIndex = worksheet.LastRowUsed()?.RowNumber() + 1;
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var headerCells = headerRowIndex != null ? worksheet.Row((int)headerRowIndex).CellsUsed() : worksheet.FirstRowUsed()?.CellsUsed();
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mapping = Mapping.MapProperties<T>(headerCells);
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if (mapping == null || mapping.Count == 0) return;
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- } else
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- rowIndex = GenerateHeader(worksheet, properties);
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+ }
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if (rowIndex == null) throw new NullReferenceException(nameof(rowIndex));
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