IDE0070Language rules (expression-level preferences)

Use System.HashCode.Combine

Description

This rule recommends the use of the System.HashCode.Combine method to compute a hash code instead of using custom hash code computation logic.

Example

class B
{
    public override int GetHashCode() => 0;
}

class C : B
{
    int j;

    // Code with violations
    public override int GetHashCode()
    {
        // IDE0070: GetHashCode can be simplified.
        var hashCode = 339610899;
        hashCode = hashCode * -1521134295 + base.GetHashCode();
        hashCode = hashCode * -1521134295 + j.GetHashCode();
        return hashCode;
    }

    // Fixed code
    public override int GetHashCode()
    {
        return System.HashCode.Combine(base.GetHashCode(), j);
    }
}

Configurable options

Vote for the value each option should take in the generated .editorconfig.

dotnet_prefer_system_hash_code

default: true

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