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CmdPal: Null pattern matching based on is expression rather than overridable operators (#40972)

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What the title says. 😄 

Rather than relying on the potentially overloaded `!=` or `==` operators
when checking for null, now we'll use the `is` expression (possibly
combined with the `not` operator) to ensure correct checking. Probably
overkill for many of these classes, but decided to err on the side of
consistency. Would matter more on classes that may be inherited or
extended.

Using `is` and `is not` will provide us a guarantee that no
user-overloaded equality operators (`==`/`!=`) is invoked when a
`expression is null` is evaluated.

In code form, changed all instances of:

```c#
something != null

something == null
```

to:

```c#
something is not null

something is null
```

The one exception was checking null on a `KeyChord`. `KeyChord` is a
struct which is never null so VS will raise an error when trying this
versus just providing a warning when using `keyChord != null`. In
reality, we shouldn't do this check because it can't ever be null. In
the case of a `KeyChord` it **would** be a `KeyChord` equivalent to:

```c#
KeyChord keyChord = new ()
{
    Modifiers = 0,
    Vkey = 0,
    ScanCode = 0
};
```
This commit is contained in:
Michael Jolley
2025-08-18 06:07:28 -05:00
committed by GitHub
parent efb48aa163
commit 6acb793184
138 changed files with 395 additions and 431 deletions
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12
src/modules/cmdpal/Microsoft.CmdPal.UI/Controls/SearchBar.xaml.cs
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@@ -51,13 +51,13 @@ public sealed partial class SearchBar : UserControl,
//// TODO: If the Debounce timer hasn't fired, we may want to store the current Filter in the OldValue/prior VM, but we don't want that to go actually do work...
var @this = (SearchBar)d;
if (@this != null
if (@this is not null
&& e.OldValue is PageViewModel old)
{
old.PropertyChanged -= @this.Page_PropertyChanged;
}
if (@this != null
if (@this is not null
&& e.NewValue is PageViewModel page)
{
// TODO: In some cases we probably want commands to clear a filter
@@ -85,7 +85,7 @@ public sealed partial class SearchBar : UserControl,
{
this.FilterBox.Text = string.Empty;
if (CurrentPageViewModel != null)
if (CurrentPageViewModel is not null)
{
CurrentPageViewModel.Filter = string.Empty;
}
@@ -143,7 +143,7 @@ public sealed partial class SearchBar : UserControl,
FilterBox.Text = string.Empty;
// hack TODO GH #245
if (CurrentPageViewModel != null)
if (CurrentPageViewModel is not null)
{
CurrentPageViewModel.Filter = FilterBox.Text;
}
@@ -154,7 +154,7 @@ public sealed partial class SearchBar : UserControl,
else if (e.Key == VirtualKey.Back)
{
// hack TODO GH #245
if (CurrentPageViewModel != null)
if (CurrentPageViewModel is not null)
{
CurrentPageViewModel.Filter = FilterBox.Text;
}
@@ -318,7 +318,7 @@ public sealed partial class SearchBar : UserControl,
}
// Actually plumb Filtering to the view model
if (CurrentPageViewModel != null)
if (CurrentPageViewModel is not null)
{
CurrentPageViewModel.Filter = FilterBox.Text;
}