RedundantOutVariable

Diagnostic Rule Overview

Field	Value
ID	SHIMMER2020
Analyzer title	Redundant out variable
Analyzer message	Out variable '0' is used exactly once and for assignment and therefore can be inlined
Code fix title	Inline temporary variable
Default severity	Info
Minimum framework/language version	C# 7
Category	ShimmeringStyle
Link to code	RedundantOutVariableAnalyzer.cs
Code fix exists?	Yes

Detailed Explanation

You can directly assign the value of an out parameter to a variable or a field without needing to declare a variable and then assign it.

Examples

Flagged code:

using System;

namespace Tests;
class Test
{
    void Do(string dayOfWeekString)
    {
        if (Enum.TryParse(dayOfWeekString, out DayOfWeek dayOfWeek1))
        {
            DayOfWeek dayOfWeek2 = dayOfWeek1;
        }
    }
}

Fixed code:

using System;

namespace Tests;
class Test
{
    void Do(string dayOfWeekString)
    {
        if (Enum.TryParse(dayOfWeekString, out DayOfWeek dayOfWeek2))
        {
        }
    }
}

Justification of the Severity

This is a stylistic suggestion that is not related to performance or buggy behaviors.

When to Suppress

Suppress this diagnostic if you find the existing code more readable.

Related Rules

• IDE0059: Remove unnecessary value assignment