(c# + windows forms) 将项目添加到不同类的listBox [英] (c# + windows forms) Adding items to listBox in different class

问题描述

我有两个类(表单)，我希望在单击时将 class2 中的一个项目添加到 class1 中的 listBox接受"按钮.

I have two classes(forms), and I would like an item from class2 to be added to listBox in class1 when I click "Accept" button.

我尝试了以下代码，但列表框没有任何变化:

I tried with the following code, but nothing changes in the listBox:

private void button1_Click(object sender, EventArgs e)
{
    CarRental i = new CarRental();
    string id = idRental.Text.ToString();

    i.listBox1.Items.Add(id);
    i.listBox1.Update();
    this.Close();
}

我在哪里犯错了?

推荐答案

在 Form2 上声明 RentalId 属性.在 CarRental 表单(您的第一个表单)中执行以下操作:

Declare RentalId property on Form2. And at CarRental form (your first form) do following:

using(Form2 form2 = new Form2())
{
    if (fomr2.ShowDialog() != DialogResult.OK)
        return;

    listBox.Items.Add(form2.RentalId);
}

以这种方式实现 Fomr2.RentalId 属性:

Implement Fomr2.RentalId property this way:

public string RentalId
{
   get { return idRental.Text; } // you don't need ToString() call
}

然后选择接受"按钮并将其 DialogResult 属性设置为 OK.因此，单击该按钮将关闭您的对话框并返回 DialogResult.OK.

Then select your "Accept" button and set its DialogResult property to OK. Thus clicking on that button will close your dialog form and return DialogResult.OK.

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