var template = @"
begin:vcard
version:2.1
n;charset=gb2312:;{0};;;
fn;charset=gb2312:{0}
tel;cell:{1}
email;work:{2}
adr;work;charset=gb2312:;;{3};;;{6};
org;charset=gb2312:{4}
title;charset=gb2312:{5}
end:vcard
";
            stringbuilder sb = new stringbuilder();
            foreach(var item in items)//items可以直接从excel复制过来
            {
                var i = item.split('\t');
                sb.appendformat(template, "姓名", "1390000", "13@qq.com", "地址", "公司", "职务", "310001");
            }

            file.writealltext("电子通讯录.vcf", sb.tostring(),encoding.default);

其实没什么好说的,关键点就是gb2312 和 encoding.default