从派生中更改基类字段值

Question

我有一个问题，是否可以从派生类更改基类的字段值。就我而言，我有两个类带Windows表单RichTextBox的基类，我想使用派生的类清除RichTextBox。

初始化RichTextBox：

        this.rtfCode.Location = new System.Drawing.Point(45, 26);
        this.rtfCode.Name = "rtfCode";
        this.rtfCode.ShowSelectionMargin = true;
        this.rtfCode.Size = new System.Drawing.Size(100, 96);
        this.rtfCode.TabIndex = 1;
        this.rtfCode.Text = "some text";

基类：

    public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
        Console.WriteLine(this.rtfCode.Text);
        DerivedClass f = new DerivedClass();
        Console.WriteLine(f.rtfCode.Text);
    }
}

我派生的类

    class DerivedClass:Program
{
    public DerivedClass()
    {
        base.rtfCode.Clear();
    }
}

当我执行程序并按RichTextBox中的button时，我仍然会看到文本。

Answer 1

Program a = new Program(); // a is an instance of Program
Console.WriteLine(a.rtfCode.Text);
DerivedClass f = new DerivedClass();// f is an instance of DerivedClass, which has nothing to do with a
Console.WriteLine(a.rtfCode.Text);

a和 f不是同一实例。派生频道...源自程序的事实不会改变任何内容。

您必须用

替换最后一行

Console.WriteLine(f.rtfCode.Text);