NPOI导出 The maximum column width for an individual cell is 255 characters

增加如下代码

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