我正在尝试从其他形式访问公共财产，但是我似乎无法以第二种形式访问它

Question

In my main form I have a property being set:

Main Form:

Int32 _pid1;
public Int32 pid1
{
    get { return _pid1; }
    set { _pid1 = value; }
}

On a button click, I open a new form, pass the main form as a constructor parameter like this:

private void admin_Click(object sender, EventArgs e)
{
    adminSettings adminW = new adminSettings(this);
    //adminW.ShowDialog();
}

In my second form, I try to access the property like this:

public adminSettings(Form mains)
{
    temp = mains.pid1;
    InitializeComponent();
}

In VS I can't compile because it highlights the property and shows error:

'System.Windows.Forms.Form' does not contain a definition for 'pid1' and no extension method 'pid1' accepting a first argument of type 'System.Windows.Forms.Form' could be found (are you missing a using directive or an assembly reference?) D:\\UI_still_in_progress\\user_interface\\Admin_screen.cs 67 25 user_interface

Intellisense also doesn't pick up on it. I've explored stackoverflow for an answer but so far it seems I've done everything correct. I'm at a loss here, any help would be much appreciated.

Edit 1:

This is where I have declared the properties in the main form:

public partial class mainForm : Form
{
    //constructor
    public mainForm()
    {
        InitializeComponent();
        //Add game titles here - The text must be referenced later in order to change game directory for exe file
        this.gameSelect.Items.Add("Bumblebee Game");
        this.gameSelect.Items.Add("Flight Simulator");
        this.gameSelect.DropDownStyle = ComboBoxStyle.DropDownList;  //read only    
        this.FormBorderStyle = FormBorderStyle.FixedSingle;
        this.MinimizeBox = false;
        this.MaximizeBox = false;
    }

    //properties
    Int32 _pid1;
    public Int32 pid1
    {
        get { return _pid1; }
        set { _pid1 = value; }
    }

    Int32 _did1;
    public Int32 did1
    {
        get { return _did1; }
        set { _did1 = value; }
    }

    Int32 _sid1;
    public Int32 sid1
    {
        get { return _sid1; }
        set { _sid1 = value; }
    }

    private void admin_Click(object sender, EventArgs e)
    {
        adminSettings adminW = new adminSettings(newLoginRequest, this);
        //adminW.ShowDialog();
    }
}

Answer 1

You are casting your MainForm to a basic Windows Form which will not have your property. Cast it to the class name of your main form in your adminSettings constructor.

public adminSettings(Form1 mains)
{
    temp = mains.did1;
    InitializeComponent();
}

This assumes that your MainForm's class is Form1