Use unbound generic type (IDE0340)

Article
2025-03-31

Property	Value
Rule ID	IDE0340
Title	Use unbound generic type
Category	Style
Subcategory	Language rules (expression-level preferences)
Applicable languages	C# 14+
Options	`csharp_style_prefer_unbound_generic_type_in_nameof`

Overview

This rule flags places where the operand of a nameof expression is a bound generic type (for example, List<int>). The code fixer offers to convert the operand to an unbound type (for example, List<>).

Options

Options specify the behavior that you want the rule to enforce. For information about configuring options, see Option format.

csharp_style_prefer_unbound_generic_type_in_nameof

Property	Value	Description
Option name	csharp_style_prefer_unbound_generic_type_in_nameof
Option values	`true`	Prefer unbound generic type in `nameof` expression
	`false`	Disables the rule
Default option value	`true`

Example

// Code with violations.
string name = nameof(List<int>);

// Fixed code.
string name = nameof(List<>);

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 IDE0340
// The code that's violating the rule is on this line.
#pragma warning restore IDE0340

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.IDE0340.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.

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