捕获由另一种形式抛出的异常 [英] Catch an Exception thrown by another form

问题描述

我试图做到这一点：

我创建另一种形式，它在它的FormClosed方法抛出一个异常，应该由主要形式被抓

I'm creating another form, which in it's FormClosed method throws an exception, that should be caught by the main form.

主要形式：

try
    {
        frmOptions frm  = new frmOptions();
        frm.ShowDialog();                        
    }
catch(Exception)
    {
        MessageBox.Show("Exception caught.");
    }

frmOptions：

frmOptions:

private void frmOptions_FormClosed(object sender, FormClosedEventArgs e)
{
    throw new Exception();
}

调试器停止与该消息异常的：

The debugger stops on the exception with this message:

异常是由用户代码未处理

Exception was unhandled by user code

为什么呢？我赶上在创建它的对象的所有者除外。 ？任何人有一个想法

Why? I'm catching the exception in the owner of the object that created it. Anybody has an idea?

推荐答案

您就可以做到这一点，如下所示：

You'll be able to do this as follows:

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

    private void button1_Click(object sender, EventArgs e)
    {
        Form2 form2 = new Form2(this);
        form2.Show();
    }

    public void HandleForm2Exception(Exception ex)
    {
        MessageBox.Show("EXCEPTION HAPPENED!");
    }
}

和上Form2.cs

and on Form2.cs

public partial class Form2 : Form
{
    private Form1 form1;

    public Form2(Form1 form1) : this()
    {
        this.form1 = form1;
    }

    public Form2()
    {
        InitializeComponent();
    }

    private void Form2_FormClosed(object sender, FormClosedEventArgs e)
    {
        try
        {
            throw new Exception();
        }
        catch (Exception ex)
        {
            if(this.form1 != null)
                this.form1.HandleForm2Exception(ex);
        }
    }
}

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