C#•14mo ago

✅ Operator ! cannot be applied to type string

yeah I cannot really test this properly since Visual Studio is not available in my current operating system. Though, I am using an online compiler to debug this in some way, shape or form. I haven't coded in C# in so long but I am contributing to an installer made in C# so how do I check if a special folder exists, and if not, add a different folder to the shortcutPaths?

if (FPM.Main.ShortcutStartMenu.Checked)
{
    if (!Environment.GetFolderPath(Environment.SpecialFolder.Programs))
    {
        shortcutPaths.Add(Environment.GetFolderPath(Environment.SpecialFolder.StartMenu));
    }
    else
    {
        shortcutPaths.Add(Environment.GetFolderPath(Environment.SpecialFolder.Programs));
    }
}

if (FPM.Main.ShortcutStartMenu.Checked)
{
    if (!Environment.GetFolderPath(Environment.SpecialFolder.Programs))
    {
        shortcutPaths.Add(Environment.GetFolderPath(Environment.SpecialFolder.StartMenu));
    }
    else
    {
        shortcutPaths.Add(Environment.GetFolderPath(Environment.SpecialFolder.Programs));
    }
}

I'm just so used to coding in Java that I use the ! operator when I mean something "isn't there."

12 Replies

Pobiega•14mo ago

prefixing everything with ! is a javascript thing

HedreonOP•14mo ago

and a java thing in some scenarios

Pobiega•14mo ago

since "!undefined" is false no in both java and C#, !true == false java does not have truth conversions the way JS has

HedreonOP•14mo ago

no I mean in Java you can use the ! operator in a bit more scenarios than C#

Pobiega•14mo ago

Show me an example

HedreonOP•14mo ago

I know it because I've programmed in Java more than I did with C#

Pobiega•14mo ago

where it works in java but not in C#

HedreonOP•14mo ago

mainly in booleans for sure okay maybe it's the same in both languages I'll admit that

Pobiega•14mo ago

It is, unless Java recentyl added some weird stuff 😛 so its common with methods that return bools but you cant do it on Environment.GetFolderPath because that returns a string

var path = Environment.GetFolderPath(Environment.SpecialFolder.Programs);
if(!Directory.Exists(path))
{
  path = Environment.GetFolderPath(Environment.SpecialFolder.StartMenu);
}
shortcutPaths.Add(path);

var path = Environment.GetFolderPath(Environment.SpecialFolder.Programs);
if(!Directory.Exists(path))
{
  path = Environment.GetFolderPath(Environment.SpecialFolder.StartMenu);
}
shortcutPaths.Add(path);

HedreonOP•14mo ago

agreed, that's where the confusion could come from okay thanks guys very amazing! 👍 How do I mark this as solved and automatically close post?

Pobiega•14mo ago

/close

HedreonOP•14mo ago

okay thanks

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✅ Operator ! cannot be applied to type string