将事件从一种形式发送到另一种形式

Question

I am really getting hard time to solve this seemingly easy problem: I have one form (Child Form) with a button which when clicked should set focus the textbox on another form (Parent Form).

I have tried to use some codes as shown below:My question is this the right aproach? And if so how to solve this error message

Cannot Implicitly Convert type 'System.EventHandler' to 'ChildForm.SomeEventHandler

public class ChildForm : Form
{
    public delegate SomeEventHandler(object sender, EventArgs e);
    public event SomeEventHandler SomeEvent;


}

public class ParentForm : Form
{
    ChildForm child = new ChildForm();
    child.SomeEvent += new EventHandler(this.HandleSomeEvent);

    public void HandleSomeEvent(object sender, EventArgs e)
    {
        this.someTextBox.select();
    }
}

Answer 1

You need to change the assignment from

child.SomeEvent += new EventHandler(this.HandleSomeEvent);

to

child.SomeEvent += new ChildForm.SomeEventHandler(this.HandleSomeEvent);

Edit 1: It looks perfect for the use of handling an event in Parent Form when an action occurs in Child form. Though it doesn't look thread-safe.

Also take a look at Form.Activate