> ## 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.

# AL0045 - Use null-or-empty guard helper

> Use Guard.NotNullOrEmpty() instead of verbose if (string.IsNullOrEmpty(...)) throw patterns

Source: [Al0045UseGuardNotNullOrEmptyAnalyzer.cs](https://github.com/ANcpLua/ANcpLua.Analyzers/blob/main/src/ANcpLua.Analyzers/Analyzers/Al0045UseGuardNotNullOrEmptyAnalyzer.cs)

## Description

Use `Guard.NotNullOrEmpty()` instead of verbose null-or-empty check and throw patterns. The guard helper is more concise and consistent.

## Bad Code

```csharp theme={null}
public void Process(string name)
{
    if (string.IsNullOrEmpty(name))
        throw new ArgumentException("Cannot be null or empty", nameof(name));
}
```

## Good Code

```csharp theme={null}
public void Process(string name)
{
    Guard.NotNullOrEmpty(name);
}
```

## Properties

* **Category**: Roslyn Utilities
* **Severity**: Warning
* **Enabled by default**: True
* **Code fix available**: True

## Configuration

```editorconfig theme={null}
dotnet_diagnostic.AL0045.severity = warning
```