不等字符串

Question

I'm trying to set a condition like this

if (myString=!"-1")
{
  //Do things
}

But it fails. I've tried

if(myString.Distinct("-1")) 
{
  //Do things
}

but it doesn't work either.

Answer 1

Try this:

if(myString != "-1")

The opperand is != and not =!

You can also use Equals

if(!myString.Equals("-1"))

Note the ! before myString

Answer 2

It should be this:

if (myString != "-1")
{
    //Do things
}

Your equals and exclamation are the wrong way round.

Answer 3

使用Equals()您还可以使用Yoda 条件：

if ( ! "-1".Equals(myString) )

Answer 4

Now in C# 9, it can be done in a more readable way like this.

string  str = "x";
if(str is not "y")
{
    ...
}