C#中DataTable判断是否存在某列

dt.Columns.Contains("列名")

例如：

if (dt.Columns.Contains("噪音数据")) {
columns.Add(new ExportFieldParam("传感器", "传感器", 300));
    columns.Add(new ExportFieldParam("时间", "时间", 150));
    columns.Add(new ExportFieldParam("值", "值", 40));
    columns.Add(new ExportFieldParam("单位", "单位", 40));
    columns.Add(new ExportFieldParam("噪音数据", "噪音数据", 60));
}
else
{
    columns.Add(new ExportFieldParam("传感器", "传感器", 300));
    columns.Add(new ExportFieldParam("时间", "时间", 150));
    columns.Add(new ExportFieldParam("值", "值", 40));
    columns.Add(new ExportFieldParam("单位", "单位", 40));
}