> ## 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.

# AL0037 - Use TryParse extensions

> Replace verbose TryParse ternary patterns with extension methods

Source: [AL0037UseTryParseExtensionsAnalyzer.cs](https://github.com/ANcpLua/ANcpLua.Analyzers/blob/main/src/ANcpLua.Analyzers/Analyzers/AL0037UseTryParseExtensionsAnalyzer.cs)

## Description

The pattern `int.TryParse(s, out var v) ? v : null` is verbose. ANcpLua.Roslyn.Utilities provides typed TryParse extensions.

## Bad Code

```csharp theme={null}
// Verbose TryParse patterns
var number = int.TryParse(input, out var n) ? n : null;
var guid = Guid.TryParse(input, out var g) ? g : default;
var date = DateTime.TryParse(input, out var d) ? d : null;
```

## Good Code

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

// Clean extension methods
var number = input.TryParseInt32();
var guid = input.TryParseGuid();
var date = input.TryParseDateTime();
```

## Properties

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

## Configuration

```editorconfig theme={null}
dotnet_diagnostic.AL0037.severity = warning
```

## Supported Types

| Type     | Extension            |
| -------- | -------------------- |
| int      | `TryParseInt32()`    |
| long     | `TryParseInt64()`    |
| double   | `TryParseDouble()`   |
| decimal  | `TryParseDecimal()`  |
| bool     | `TryParseBool()`     |
| Guid     | `TryParseGuid()`     |
| DateTime | `TryParseDateTime()` |
| TimeSpan | `TryParseTimeSpan()` |