Inline variable declaration (IDE0018)
| Property | Value |
|---|---|
| Rule ID | IDE0018 |
| Title | Inline variable declaration |
| Category | Style |
| Subcategory | Language rules (expression-level preferences) |
| Applicable languages | C# |
| Options | csharp_style_inlined_variable_declaration |
Overview
This style rule concerns whether out variables are declared inline or not. Starting in C# 7, you can declare an out variable in the argument list of a method call, rather than in a separate variable declaration.
Options
The associated option for this rule specifies whether you prefer out variables to be declared inline or separately.
For more information about configuring options, see Option format.
csharp_style_inlined_variable_declaration
| Property | Value | Description |
|---|---|---|
| Option name | csharp_style_inlined_variable_declaration | |
| Option values | true |
Prefer out variables to be declared inline in the argument list of a method call when possible |
false |
Prefer out variables to be declared before the method call |
|
| Default option value | true |
// csharp_style_inlined_variable_declaration = true
if (int.TryParse(value, out int i)) {...}
// csharp_style_inlined_variable_declaration = false
int i;
if (int.TryParse(value, out i)) {...}
Suppress a warning
If you want to suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.
#pragma warning disable IDE0018
// The code that's violating the rule is on this line.
#pragma warning restore IDE0018
To disable the rule for a file, folder, or project, set its severity to none in the configuration file.
[*.{cs,vb}]
dotnet_diagnostic.IDE0018.severity = none
To disable all of the code-style rules, set the severity for the category Style to none in the configuration file.
[*.{cs,vb}]
dotnet_analyzer_diagnostic.category-Style.severity = none
For more information, see How to suppress code analysis warnings.
