传递参数在Form构造函数中，winforms c＃ [英] Passing parameters in the Form constructor, winforms c#

问题描述

我有以下继承层次结构：

I have a following inheritance hierarchy:

A类：FormÚ
B类：A类

Class A : Form
Class B : Class A

A类需要能够接受一个参数，这样我可以这样创建B类的实例：

Class A needs to be able to accept a parameter so that I can create the instance of Class B like this:

ClassB mynewFrm = new ClassB(param);

如何在A类中定义这样的构造函数？

How do I define such a constructor in Class A?

感谢！

我在.NET 3.5中使用Winforms，c＃

I am using Winforms in .net 3.5, c#

b $ b A类和B类使用部分类定义为表单。
所以我猜这是一个关于部分类和自定义（覆盖）构造函数的问题。

EDITED: Class A and Class B are defined as forms, using partial classes. So I guess this is turning into a question about partial classes and custom (overriden) constructors.

推荐答案

为了方便您的学习，我选择了一个字符串类型参数，您可以根据自己的需要调整

For the sake of ease your learning, I chose a string type parameter that you adjust to your case.

要测试它，请创建一个新的 Visual Studio * C＃ *项目并填写 .cs 与以下代码

To test it, create a new Visual Studio *C#* project and fill program.cs with the following code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace Stackoverflow
{

    public class ClassA : Form
    {
        public ClassA()
        {
            InitializeComponent();
        }

        public ClassA(string WindowTitleParameter)
        {
            InitializeComponent();
            this.Text = WindowTitleParameter;
            MessageBox.Show("Hi! I am ClassB constructor and I have 1 argument. Clic OK and look at next windows title");
        }

        private void InitializeComponent() // Usually, this method is located on ClassA.Designer.cs partial class definition
        {
            // ClassA initialization code goes here
        }

    }

    public class ClassB : ClassA
    {
        // The following defition will prevent ClassA's construtor with no arguments from being runned
        public ClassB(string WindowTitleParameter) : base(WindowTitleParameter) 
        {
            InitializeComponent();
            //this.Text = WindowTitleParameter;
            //MessageBox.Show("Hi! I am ClassB constructor and I have 1 argument. Clic OK and look at next windows title");
        }

        private void InitializeComponent() // Usually, this method is located on ClassA.Designer.cs partial class definition
        {
            // ClassB initialization code goes here
        }

    }

    static class Program
    {
        /// <summary> 
        /// The main entry point for the application. 
        /// </summary> 
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            // If you debug this code using StepInto, you will notice that contructor of ClassA (argumentless)
            // will run prior to contructor of classB (1 argument)

            Application.Run(new ClassB("Look at me!"));
        }
    }
}

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