防止重复MDI子窗体 [英] Prevent duplicate MDI children forms

问题描述

有没有办法阻止某种形式的如果说形式已经打开一个MDI容器内的开？

Is there a way to prevent the opening of a certain form within an MDI container if that said form is already opened?

推荐答案

您可以interate在OpenForms集合，以检查是否已存在给定类型的一种形式：

You can interate over the OpenForms collection to check if there is already a form of the given type:

foreach (Form form in Application.OpenForms)
{
    if (form.GetType() == typeof(MyFormType))
    {
        form.Activate();
        return;
    }
}

Form newForm = new MyFormType();
newForm.MdiParent = this;
newForm.Show();

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