c#从另一个方法引用标签

Question

I want if mouse leave the visible status change to false,but I get this error message: Error CS7036 There is no argument given that corresponds to the required formal parameter 'e' of 'Form1.Repair_MouseLeave(object, EventArgs, Label)' How shoudl I fix it?

    private void Repair_MouseHover(object sender, EventArgs e)
    {
        Label RepairText = new Label();
        RepairText = new Label();
        RepairText.Location = new Point(161, 12);
        RepairText.Text = "This what the program will do";
        this.Controls.Add(RepairText);
        RepairText.AutoSize = true;
        Repair_MouseLeave(RepairText);

    }

    private void Repair_MouseLeave(object sender, EventArgs e,Label repairtext)
    {
    repairtext.Visible = false;

    }

Answer 1

First of all, we need to set our event handlers for the MouseHover and MouseLeave methods for the Repair control. I am assuming you know how to do this. Still, binding to the events of Repair control can be achieved using the Properties window of your Form in design mode. Set event handlers to both MouseHover and MouseLeave .

As far as I can see, you are trying to display a label with some text when the mouse is hovering over this Repair control and want to hide it when the mouse leaves it. But you are handling it incorrectly. First of all, calling MouseLeave from inside MouseHover would immediately hide your new label and it would not be displayed at all.

And your method signature for Repair_MouseLeave is also incorrect. A standard event handler takes two parameters: (object sender, EventArgs e)

Implement your event handlers like the following, having the new label repairText as an instance member of your class:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private Label repairText;

    private void Repair_MouseHover(object sender, EventArgs e)
    {
        if(repairText == null)
        {
            repairText = new Label();
            repairText.Location = new Point(161, 12);
            repairText.Text = "This what the program will do";
            repairText.AutoSize = true;
            this.Controls.Add(repairText);
        }
        repairText.Visible = true;
    }

    private void Repair_MouseLeave(object sender, EventArgs e)
    {
        if(repairText != null)
        {
            repairText.Visible = false;
        }
    }
}