Dialog MessageBox有时隐藏在主窗体后面

    private static DialogResult ShowMessageBox(
        string message, 
        string caption, 
        MessageBoxButtons buttons, 
        MessageBoxIcon icon)
    {

        var showMessageBoxTask = new Task<DialogResult>(() =>
        {
            var form = new Form() {TopMost = true};

            var result = MessageBox.Show(
                form,
                PrepareMessage(message),
                caption,
                buttons,
                icon);

            form.Dispose();

            return result;
        });

        showMessageBoxTask.Start();

        while (!showMessageBoxTask.IsCompleted && !showMessageBoxTask.IsFaulted)
        {
            Application.DoEvents();
        }

        return showMessageBoxTask.Result;
    }

在父窗体中，在MessageBox.Show（）之前添加它： this.TopMost = false;

原文地址：https://www.orcode.com/question/830152_k0c907.html