优化C#中的构造函数重载

Question

我有一个带有以下构造函数的 Winforms 应用程序：

public Form1()
{
  InitializeComponent();
 //Code that enables/disables buttons etc
}

public Form1(int ID)
{
  searchByID = ID;
  InitializeComponent();
 //Code that enables/disables buttons etc
}

选哪一个？这取决于程序是否由带有附加参数的 CMD 启动。这是检查的主要内容：

static void Main(string[] args)
{
            //Args will be the ID passed by a CMD-startprocess (if it's started by cmd of course

            if (args.Length == 0)
            {
                Application.Run(new Form1());
            }
            else if(args.Length>0)
            {
                string resultString = Regex.Match(args[0], @"\d+").Value;
                incidentID = Int32.Parse(resultString);
                try
                {
                    Application.Run(new Form1(incidentID));
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString());

                }
            }
}

我的问题是：

如何优化构造函数？它们都包含大约 30 行相同的代码，我想通过执行以下操作来解决此问题：

  public Form1()
    {
        Form1(0)
    }


 public Form1(int ID)
 {
       if (ID>0)
    {
       //it has an ID
    }else
    {
       doesn't have an ID
    }
 }

但这给了我错误：

Non-invocable member cannot be used like a method.

我该如何优化它？

Answer 1

您需要做的是：

public Form1() : this(0)
{
}

public Form1(int ID)
{
    if (ID>0)
    {
        //it has an ID
    }
    else
    {
        //doesn't have an ID
    }
}

这称为将构造函数链接在一起 - 因此 : this(0) 表示 "before you run the code in this constructor, call the other one and pass "0" 作为其参数"

优化C#中的构造函数重载

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