在Form构造函数中传递参数,winforms c#

Question

我有一个以下的继承层次结构:

A类:
B类表格:A类

A类需要能够接受一个参数,这样我才能像这样创建B类实例:

ClassB mynewFrm = new ClassB(param);

如何在A类中定义这样的构造函数？

谢谢!

我在.net 3.5中使用Winforms,c#

编辑:使用部分类将A类和B类定义为表单.所以我想这会变成一个关于部分类和自定义(覆盖)构造函数的问题.

Answer 1

这是一个完整的演示示例,演示了所需的行为.

为了方便您的学习,我选择了一个根据您的情况调整的字符串类型参数.

要测试它,请创建一个新的Visual Studio*C#*项目并使用以下代码填充program.cs

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!"));
        }
    }
}