Deconstruct variable declaration (IDE0042)
Property | Value |
---|---|
Rule ID | IDE0042 |
Title | Deconstruct variable declaration |
Category | Style |
Subcategory | Language rules (expression-level preferences) |
Applicable languages | C# |
Options | csharp_style_deconstructed_variable_declaration |
Overview
This style rule concerns the use of deconstruction in variable declarations, when possible.
Options
Options specify the behavior that you want the rule to enforce. For information about configuring options, see Option format.
csharp_style_deconstructed_variable_declaration
Property | Value | Description |
---|---|---|
Option name | csharp_style_deconstructed_variable_declaration | |
Option values | true |
Prefer deconstructed variable declaration |
false |
Do not prefer deconstruction in variable declarations | |
Default option value | true |
// csharp_style_deconstructed_variable_declaration = true
var (name, age) = GetPersonTuple();
Console.WriteLine($"{name} {age}");
(int x, int y) = GetPointTuple();
Console.WriteLine($"{x} {y}");
// csharp_style_deconstructed_variable_declaration = false
var person = GetPersonTuple();
Console.WriteLine($"{person.name} {person.age}");
(int x, int y) point = GetPointTuple();
Console.WriteLine($"{point.x} {point.y}");
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 IDE0042
// The code that's violating the rule is on this line.
#pragma warning restore IDE0042
To disable the rule for a file, folder, or project, set its severity to none
in the configuration file.
[*.{cs,vb}]
dotnet_diagnostic.IDE0042.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.
See also
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