运算符'+'未定义为类型'ListItem'和字符串“，”

Question

我正在尝试将文本放在下面的会话中，所以它基本上是Product1，Product2，Product3等等...另外如果会话包含文本“Select ....”将其替换为“”当我运行下面的代码我得到错误运算符'+'没有定义类型'ListItem'和字符串“，”。

NameofProduct = Session("Product1") + "," + Session("Product2").Replace("Select....", "") + ","  + Session("Product3") + "," + Session("Product4") + "," + Session("ProductManual")

Answer 1

您正在尝试将objects连接在一起，而是执行此操作：

NameofProduct = Session("Product1").ToString() + "," + Session("Product2").ToString().Replace("Select....", "") + ","  + Session("Product3").ToString() + "," + Session("Product4").ToString() + "," + Session("ProductManual").ToString()

Answer 2

为了可维护性而使用StringBuilder：

Dim sb as new StringBuilder
sb.AppendFormat("{0},", Session("Product1"))
sb.AppendFormat("{0},", Session("Product2").Replace("Select....", ""))
sb.AppendFormat("{0},", Session("Product3"))
sb.AppendFormat("{0},", Session("Product4"))
sb.AppendFormat("{0}", Session("ProductManual")
NameofProduct = sb.ToString()

Answer 3

好奇，你试过&运算符???

NameofProduct = Session("Product1") & "," & Session("Product2").Replace("Select....", "") & "," & Session("Product3") & "," & Session("Product4") & "," & Session("ProductManual")

试试

Answer 4

IMO尝试Session（“Product1”）。ToString（）在串联的所有部分;你会发现它们并非都是字符串......