使用颜色填充就行，Ｅｘｃｅｌ中颜色数值对应表 https://docs.microsoft.com/en-us/previous-versions/office/developer/office-2007/cc296089(v=office.12)?redirectedfrom=MSDN
Range range = workSheet.get_Range("A1", "AL1");
range.Font.Size = ０;
将Ａ１，ＡＬ１指定范围内的单元格填充为白色，这样网线就没了
原文：https://www.cnblogs.com/runningsoybean/p/11653723.html