用户控件完全显示后显示一个消息框 | 用户控件完全显示后显示一个消息框

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问题描述

我有一个control form派生自 windows用户控件类.表单显示后，我需要根据条件显示message box.我尝试使用form paint event handler来执行此操作，但似乎触发了两次.结果，message box显示了两次.该怎么办?

I have a control form derived from a windows User Control class. I need to show a message box based on a condition once the form displayed. I tried to use the form paint event handler to do this but it seems firing twice. As a result message box displayed twice. How can this be done?

public partial class SelectAccounts : UserControl
{
    private void SelectAccounts_Paint(object sender, PaintEventArgs e)
    {
         MessageBox.Show("something");
    }
}

推荐答案

我已经删除了以前的答案，您可以尝试以下代码.使用变量来记住是否加载了用户控件.

I've deleted my previous answer you may try the below code.Using variable to remember if the user control is loaded or not.

    public partial class SelectAccounts : UserControl
    {
        bool _Shown = false;
        private void SelectAccounts_Paint(object sender, PaintEventArgs e)
        {
            if (!this._Shown)
            {
                this._Shown = true;
                MessageBox.Show("something");
            }
        }
    }

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