Remove unnecessary cast (IDE0004)

Property Value
Rule ID IDE0004
Title Remove unnecessary cast
Category Style
Subcategory Unnecessary code rules
Applicable languages C# and Visual Basic


This rule flags unnecessary type casts. A cast expression is unnecessary if the code semantics would be identical with or without it.


This rule has no associated code-style options.


// Code with violations
int v = (int)0;

// Fixed code
int v = 0;
' Code with violations
Dim v As Integer = CType(0, Integer)

' Fixed code
Dim v As Integer = 0

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 IDE0004
// The code that's violating the rule is on this line.
#pragma warning restore IDE0004

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

dotnet_diagnostic.IDE0004.severity = none

To disable all of the code-style rules, set the severity for the category Style to none in the configuration file.

dotnet_analyzer_diagnostic.category-Style.severity = none

For more information, see How to suppress code analysis warnings.

See also