> ## Documentation Index
> Fetch the complete documentation index at: https://ancplua.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# AL0028 - Use IsEqualTo extension

> Replace SymbolEqualityComparer.Default.Equals calls with the cleaner IsEqualTo extension method

Source: [AL0028UseIsEqualToAnalyzer.cs](https://github.com/ANcpLua/ANcpLua.Analyzers/blob/main/src/ANcpLua.Analyzers/Analyzers/AL0028UseIsEqualToAnalyzer.cs)

## Description

The `SymbolEqualityComparer.Default.Equals(a, b)` pattern is verbose and harder to read. ANcpLua.Roslyn.Utilities provides the `IsEqualTo()` extension method for cleaner symbol equality comparisons.

## Bad Code

```csharp theme={null}
using Microsoft.CodeAnalysis;

// Verbose equality comparison
if (SymbolEqualityComparer.Default.Equals(symbol1, symbol2))
{
    // ...
}

// Also flagged
var areEqual = SymbolEqualityComparer.Default.Equals(left, right);
```

## Good Code

```csharp theme={null}
using ANcpLua.Roslyn.Utilities;

// Clean extension method
if (symbol1.IsEqualTo(symbol2))
{
    // ...
}

// Also works with nullable symbols
var areEqual = left.IsEqualTo(right);
```

## Properties

* **Category**: Usage
* **Severity**: Info
* **Enabled by default**: True
* **Code fix available**: False

## Configuration

```editorconfig theme={null}
dotnet_diagnostic.AL0028.severity = suggestion
```

## Notes

The `IsEqualTo()` extension method:

* Handles null checks automatically
* Uses `SymbolEqualityComparer.Default` internally
* Works with any `ISymbol` types
* Improves code readability in Roslyn analyzers