从另一个具有所有组件的窗体中打开一个新窗体

Question

Im trying to open a new form on a click on the main form. The problem is the the new form oppens up but whithout any component, just embty form this is what i wrote.

private void button2_Click(object sender, EventArgs e)
    {
        Form rr = new Form();
        this.Hide();
        rr.ShowDialog();

    }

Answer 1

That's because you're opening basic Form but not your form (that is with controls).

Suppose your form class (which you've designed) is MyForm , so you should put it like

  private void button2_Click(object sender, EventArgs e) {
    MyForm rr = new MyForm(); // <- MyForm not Form!
    rr.ShowDialog();
  }

Answer 2

Problem : it is because you are just creating and displaying the new Form without adding controls on it.

Method 1 : You can Add controls to the Form created at runtime.

Try This: Adding Label on Form -similarly you can add other controls.

        Form rr = new Form();
        Label l1=new Label();
        l1.Text = "label 1";
        rr.Controls.Add(l1);
        this.Hide();
        rr.ShowDialog();

Method 2 : you can create the NewForm from IDE and add then add controls from DesignView .

Adding Form from Visual Studio IDE:

1. Right click on project
2. Select Add -> Windows Form...
3. Now Enter form your formname -> SampleForm
4. Now Add the controls on the newly created SampleForm
5. Display the newly created Form

SampleForm sample=new SampleForm();
sample.ShowDialog();

Answer 3

i have a little helper function witch is this:

  private void ShowForm<T>() where T: Form, new ()
    {
        this.Hide();
        T form = new T();
        form.FormClosed += (s, e) => this.Show();
        form.Show();
    }

this is the main form witch works like a storyboard and for example when some one click a button and im going to display a new form i do this:

    private void SomeButton_Click(object sender, EventArgs e)
    {
        ShowForm<PublishersForm>();
    }