C#中DataTable判斷是否存在某列

dt.Columns.Contains("列名")

例如：

if (dt.Columns.Contains("噪音數據")) {
columns.Add(new ExportFieldParam("傳感器", "傳感器", 300));
    columns.Add(new ExportFieldParam("時間", "時間", 150));
    columns.Add(new ExportFieldParam("值", "值", 40));
    columns.Add(new ExportFieldParam("單位", "單位", 40));
    columns.Add(new ExportFieldParam("噪音數據", "噪音數據", 60));
}
else
{
    columns.Add(new ExportFieldParam("傳感器", "傳感器", 300));
    columns.Add(new ExportFieldParam("時間", "時間", 150));
    columns.Add(new ExportFieldParam("值", "值", 40));
    columns.Add(new ExportFieldParam("單位", "單位", 40));
}