How to Call a non standard Constructor

Question

I'm new to C# and having problems with the usage of a non standard constructor. This is a part of the interface of the library I'm using (QRCoder) after the latest update:

public class Contact
  {
    [Obsolete("This constructor is deprecated. Use WithCombinedAddress instead.")]
    public Contact(string name, string country, string addressLine1, string addressLine2);
    [Obsolete("This constructor is deprecated. Use WithStructuredAddress instead.")]
    public Contact(string name, string zipCode, string city, string country, string street = null, string houseNumber = null);

    public static Contact WithCombinedAddress(string name, string country, string addressLine1, string addressLine2);
    public static Contact WithStructuredAddress(string name, string zipCode, string city, string country, string street = null, string houseNumber = null);
    public override string ToString();

Before the update, this code used to work:

  Contact contactCreditor;
  string name, zipCode, city, country, street, housenr, strIban;
  ... 
  contactCreditor = new SwissQrCode.Contact (name, zipCode, city, country, street, housenr);

Now I get the error message

This constructor is deprecated. Use WithStructuredAddress instead.

How can I modify my code to use this new constructor?

Welcome. `WithCombinedAddress` is a [static method](https://stackoverflow.com/questions/4124102/whats-a-static-method-in-c) that can be called without having an instance of your `Contact` class. Call it like `Contact.WithCombinedAddress` and you'll get your instance - just like before. — devsmn, Sep 28 '22 at 08:34
Replace `new SwissQrCode.Contact` with `SwissQrCode.Contact.WithStructuredAddress`. — Johnathan Barclay, Sep 28 '22 at 08:34
`var newContact = SwissQrCode.Contact.WithStructuredAddress(...)` — DavidG, Sep 28 '22 at 08:34

score 3 · Accepted Answer · answered Sep 28 '22 at 08:36

3

The class no longer has a non deprecated constructor, instead call the static initializer.

Contact contactCreditor;
  string name, zipCode, city, country, street, housenr, strIban;
  ... 
  contactCreditor = SwissQrCode.Contact.WithStructuredAddress(
                        name,
                        zipCode,
                        city,
                        country,
                        street,
                        housenr);

answered Sep 28 '22 at 08:36

Jodrell

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Thanks for pointing out the necessary change. Works like a charm. – GrulliGramps Sep 30 '22 at 09:42

How to Call a non standard Constructor

1 Answers1