Remove unnecessary using directives (IDE0005)
Property | Value |
---|---|
Rule ID | IDE0005 |
Title | Remove unnecessary import |
Category | Style |
Subcategory | Unnecessary code rules (using directive preferences) |
Applicable languages | C# and Visual Basic |
Overview
This rule flags the following unnecessary constructs. If unnecessary, these constructs can be removed without changing the semantics of the code:
- using directives (C#).
- Import statements (Visual Basic).
Note
To enable this rule on build, you need to enable XML documentation comments for the project. For more information, see dotnet/roslyn issue 41640.
Options
This rule has no associated code-style options.
Example
// Code with violations
using System;
using System.IO; // IDE0005: Using directive is unnecessary
class C
{
public static void M()
{
Console.WriteLine("Hello");
}
}
// Fixed code
using System;
class C
{
public static void M()
{
Console.WriteLine("Hello");
}
}
' Code with violations
Imports System.IO ' IDE0005: Imports statement is unnecessary
Class C
Public Shared Sub M()
Console.WriteLine("Hello")
End Sub
End Class
' Fixed code
Class C
Public Shared Sub M()
Console.WriteLine("Hello")
End Sub
End Class
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 IDE0005
// The code that's violating the rule is on this line.
#pragma warning restore IDE0005
To disable the rule for a file, folder, or project, set its severity to none
in the configuration file.
[*.{cs,vb}]
dotnet_diagnostic.IDE0005.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.
Property | Value |
---|---|
Rule ID | IDE0005 |
Title | Open declaration can be removed |
Category | Style |
Applicable languages | F# |
Options | None |
Overview
This rule flags unnecessary open declarations. For example, open System.Collections
is unnecessary in the following snippet:
open System.Collections
printfn "Hello from F#"
See also
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