How Can I Call One Constructor from Another in C# to Avoid Code Duplication?

Call another constructor in C#

When dealing with constructors that initialize read-only fields, it is desirable to avoid duplication of logic. Additionally, setting read-only fields only within the constructor ensures data integrity. However, constructors cannot directly call other constructors.

Solution: Method chain calling

To overcome this limitation, method chaining can be used. In C#, this involves calling a new constructor with parameters from an existing constructor. This syntax allows you to initialize multiple fields while centralizing your setup logic:

<code class="language-csharp">public class Sample
{
    public Sample(string theIntAsString) : this(int.Parse(theIntAsString))
    {
        // ...额外的初始化逻辑...
    }

    public Sample(int theInt)
    {
        _intField = theInt;
    }

    public int IntProperty => _intField;

    private readonly int _intField;
}</code>

You can delegate field initialization to a constructor that takes an integer argument by calling it from a constructor that takes a string argument. This eliminates code duplication and ensures consistent field settings.

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