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perf: csv insert #653

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merged 1 commit into from
Aug 16, 2024
Merged

perf: csv insert #653

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7 changes: 6 additions & 1 deletion src/MiniExcel/MiniExcel.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,14 +27,17 @@ public static MiniExcelDataReader GetReader(this Stream stream, bool useHeaderRo
public static void Insert(string path, object value, string sheetName = "Sheet1", ExcelType excelType = ExcelType.UNKNOWN, IConfiguration configuration = null)
{
if (Path.GetExtension(path).ToLowerInvariant() != ".csv")
throw new NotSupportedException("MiniExcel SaveAs only support csv insert now");
throw new NotSupportedException("MiniExcel only support csv insert now");

using (var stream = new FileStream(path, FileMode.Append, FileAccess.Write, FileShare.Read, 4096, FileOptions.SequentialScan))
Insert(stream, value, sheetName, ExcelTypeHelper.GetExcelType(path, excelType), configuration);
}

public static void Insert(this Stream stream, object value, string sheetName = "Sheet1", ExcelType excelType = ExcelType.XLSX, IConfiguration configuration = null)
{
if (excelType != ExcelType.CSV)
throw new NotSupportedException("MiniExcel only support csv insert now");

// reuse code
object v = null;
{
Expand All @@ -43,6 +46,8 @@ public static void Insert(this Stream stream, object value, string sheetName = "
else
v = value;
}

stream.Seek(0, SeekOrigin.End);
ExcelWriterFactory.GetProvider(stream, v, sheetName, excelType, configuration, false).Insert();
}

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