CODEWITHSUNDEEP
c#.net
Zaid Masud
Zaid Masud

Reputation: 13443

When chaining a base constructor, how can I reuse initialization code in an overload

Please see question embedded in comment below.

public class CustomException : Exception
{
    private readonly string _customField;

    public CustomException(string customField, string message)
        : base(message)
    {
        // What's the best way to reuse the customField initialization code in the
        // overloaded constructor? Something like this(customField)
    }

    public CustomException(string customField)
    {
        _customField = customField;
    }
}

I'm open to considering alternative implementations that reuse the base constructor and minimize initialization code. I'd like to keep the _customField readonly, which is not possible if I extract a separate initialization method.

Upvotes: 5

Views: 902

Answers (2)

user743382
user743382

Reputation:

Factor it out into a separate method, and call that method from both constructors.

public class CustomException : Exception
{
    private readonly string _customField;

    public CustomException(string customField, string message)
        : base(message)
    {
        Init(out _customField, customField);
    }

    public CustomException(string customField)
        : base()
    {
        Init(out _customField, customField);
    }

    private Init(out string _customField, string customField)
    {
        _customField = customField;
    }
}

Upvotes: 3

L.B
L.B

Reputation: 116118

public CustomException(string customField) : this(customField,"")
{
}

Upvotes: 7

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