如果是空值則賦值0
if (Convert.ToDouble(txtfirstjdjes.Text) + Convert.ToDouble(txtsecondlyjdjes.Text) + Convert.ToDouble(txtthirdjdjes.Text) + Convert.ToDouble(txtfourjdjes.Text) > Convert.ToDouble(lblysjes))
里面有的可能為空，怎么實現這個判斷
9 回答
絕地無雙
TA貢獻1946條經驗 獲得超4個贊
double num1=string.isnullorempty(txtfirstjdjes.Text.trim())?0:convert.todouble(txtfirstjdjes.Text.trim())
double num2=string.isnullorempty(txtsecondlyjdjes.Text.trim())?0:convert.todouble(txtsecondlyjdjes.Text.trim())
double num3=string.isnullorempty(txtthirdjdjes.Text.trim())?0:convert.todouble(txtthirdjdjes.Text.trim())
double num4=string.isnullorempty(txtfourjdjes.Text.trim())?0:convert.todouble(txtfourjdjes.Text.trim())
蕭十郎
TA貢獻1815條經驗 獲得超13個贊
自己寫個擴展方法唄
?
1 public static class Objects
2 {
3 ///
4 /// 將對象安全的轉換為int類型（如果轉換失敗，則為默認值 true:1 false:0）
5 ///
6 ///
7 /// 默認值
8 ///
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