错误:运算符'！'不能应用于类型为object的操作数 [英] Error: Operator '!' cannot be applied to operand of type object

问题描述

我有一个错误显示:在我的以下代码中，运算符！"无法应用于类型为object的操作数.我该如何解决?

I have a error that shows: Operator ''!'' cannot be applied to operand of type object in my following code. How do i solve it?

if (!(Session["counter"]))
        {
            counter = (int)Session["counter"];
        }

推荐答案

尝试一下.

Try this.

(! (Session["Counter"] is null)
counter = (int)Session["counter"];

为 MSDN [ ^ ]状态:

>
逻辑否定运算符(！)是一元运算符，它会否定其操作数. 为 bool 定义，并且仅当其操作数为false时才返回true.

The logical negation operator (!) is a unary operator that negates its operand. It is defined for bool and returns true if and only if its operand is false.

因此您不能将其应用于整数变量.

您可以将其更改为:

hence you cannot apply it to integer variables.

You might change it to:

if ( Session["counter"] != 0)
{
//...
}

这取决于会话变量Counter的值.

如果您假设它是一个integer 值，那么您应该编写类似
的代码

It depends on the value of the session variable Counter.

If you are assuming it is a integer value, you should be writing code like

if (!(int)Session["counter"] == 0)
{
  counter = ....
}

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