如何关闭窗体并打开另一个

Question

Currently learning to code in C#. I have used the code

Form1.Hide();
Music_Menu.Show();

The names for the forms are correct and believe this should work but I get this error when I hover over the text:

an object reference is required to access non static field member or property c#

Answer 1

I am betting that Music_Menu is the name of your form's class.

You need to create an INSTANCE of the form. VB did this "behind the scenes," but C# demands you get it right.

Somewhere in Program.Main(), I'll bet you have a line:

Application.Run(new Form1());

You need to keep that reference. A private static field in the Program class should work.

private static Form1 _myForm1;
private static Music_Menu _myMusic_Menu;

Then in the Main() method, change that to:

_myForm1 = new Form1();
Application.Run(_myForm1);

Then your code (where you switch) should be (in Program.cs):

_myForm1.Hide(); 
_myMusic_Menu = new Music_Menu();
_myMusic_Menu.Show();

Alternatively, if you want to run the code in Form1 (and assuming you want to come back to your instance of Form1:

this.Hide();
var myMusic_Menu = new Music_Menu();
myMusic.ShowDialog();
this.Show();

You'll probably have some scope issues to straighten out depending on your context, but this should get you going in the right direction.