The maximum column width for an individual cell is 255 characters. 的解决方案

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解决方案：

//设置列宽                           // sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);                           if (arrColWidth[column.Ordinal] > 255)                           {                               arrColWidth[column.Ordinal] = 254;                           }                           else                           {                               sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);                           }