int orgColWidth = (arrColWidth[column.Ordinal] + 1);
if (liekuan > 255) liekuan = 255;
//设置列宽
sheet.SetColumnWidth(column.Ordinal, liekuan * 256);

转载于:https://wwwblogs/zhaogaojian/p/9541961.html

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POI导出Excel 错误THE MAXIMUM COLUMN WIDTH FOR AN INDIVIDUAL CELL IS 255 CHARACTERS