C#•6mo ago

Is there any difference between named arguments and default constructor arguments for an attribute?

Is there any difference between these attributes? Is one better to use than the other?

[AttributeUsage(AttributeTargets.Class)]
public class CustomAttribute : System.Attribute
{
    public string Name { get; }

    public CustomAttribute(string name = "")
    {
        Name = name;
    }
}

[AttributeUsage(AttributeTargets.Class)]
public class CustomNonDefaultAttribute : System.Attribute
{
    public string Name { get; set; } = "";
}

[Custom(name: "sdfsd")]
[CustomNonDefault(Name = "sdfsd")]
public class MyClass
{
}

[AttributeUsage(AttributeTargets.Class)]
public class CustomAttribute : System.Attribute
{
    public string Name { get; }

    public CustomAttribute(string name = "")
    {
        Name = name;
    }
}

[AttributeUsage(AttributeTargets.Class)]
public class CustomNonDefaultAttribute : System.Attribute
{
    public string Name { get; set; } = "";
}

[Custom(name: "sdfsd")]
[CustomNonDefault(Name = "sdfsd")]
public class MyClass
{
}

2 Replies

333fred•6mo ago

The BCL prefers properties, because adding a new default ctor parameter can be a breaking change if you don't leave the old constructor there

nathanAjacobs•6mo ago

Thanks for that insight!

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Is there any difference between named arguments and default constructor arguments for an attribute?