为什么我会收到此语法错误

Question

if(gasType.Items.Add("3.19") == checked)
{
}

I keep getting a Syntax error stating that I am missing ( anything I am doing wrong?

Answer 1

checked is a keyword - you can't declare an identifier called that. You should have an error at the point of its declaration, too.

The reason you're getting that particular error is that it's expecting a checked expression, eg

if (gasType.Items.Add("3.19") == checked(y + 1 == 20))

If you really want to use the name checked , you could prefix it with @ like this:

bool @checked = true;

if (gasType.Items.Add("3.19") == @checked)

I wouldn't recommend it though.

Answer 2

我不确定你在这里尝试做什么，但是在C＃中检查是一个关键字

Answer 3

Add（）方法不返回值，您尝试比较它。

Answer 4

If the item is a list of any sort, the Add() method doesn't return the object added. So, what you're really saying is if( == checked).

I'm not entirely sure what you're looking to do with this, but definitely rethink your approach.

Answer 5

真正的问题很可能是，如果你的Items.Add()方法是一个股票CLR集合（似乎很可能），就像SCG.List<T>一个实例， Add()方法几乎肯定会返回void ：没有什么可以相比。