如果是空值则赋值0
if (Convert.ToDouble(txtfirstjdjes.Text) + Convert.ToDouble(txtsecondlyjdjes.Text) + Convert.ToDouble(txtthirdjdjes.Text) + Convert.ToDouble(txtfourjdjes.Text) > Convert.ToDouble(lblysjes))
里面有的可能为空,怎么实现这个判断
慕工程0101907
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