C#构造函数问题

Question

我有一个关于 C# 的构造函数问题。

我有这门课:

public partial class Signature : Form, ISignature
{
    private readonly SignatureMediator mediator;

    public Signature(SignatureMediator mediator)
    {
        this.mediator = mediator;
        InitializeComponent();
    }

    .... more stuff
 }

我想像这样构造这个类:

    public SignatureMediator(int someValue, int otherValue, int thirdValue)  
       : this(new Signature(this), someValue, otherValue, thirdValue)
    // This is not allowed --^
    {
        // I don't see anyway to get this in to the ":this" part.
        //Signature signature = new Signature(this);

    }            


    public SignatureMediator(ISignature form, int someValue, int otherValue, int thirdValue)
    {
        SigForm = form;
        SomeValue= someValue;
        OtherValue= otherValue;
        ThirdValue= thirdValue;
    }

The : this( new SignatureThis(this) is not allowed (the this used in the constructor is not allowed).

有没有办法在不重复分配 int 值的情况下进行设置？

Answer 1

如果 ISignature 参数为 null，如何让第二个构造函数从 this 构造一个 Signature，否则使用提供的 ISignature？然后您可以从第一个构造函数传递 null 以获得您想要的行为。

public SignatureMediator(int someValue, int otherValue, int thirdValue)  
   : this(null, someValue, otherValue, thirdValue)
{
}            

public SignatureMediator(ISignature form, int someValue, int otherValue, int thirdValue)
{
    if (form == null)
    {
        SigForm = new Signature(this);
    }
    else
    {
        SigForm = form;
    }

    SomeValue = someValue;
    OtherValue = otherValue;
    ThirdValue = thirdValue;
}