循环遍历所有 MDI 子级并关闭除当前窗体之外的所有其他窗体 [英] Loop through all MDI children and close all other forms except the current

问题描述

我正在使用 c# 开发一个 winforms 应用程序.我有一个 MDI 容器，它的左侧有一个菜单，按一下按钮就可以看到相应的表单.如果我单击打开 Form1 的按钮 3 次，则会打开该表单的 6 个实例.因此，我认为我必须编写一个方法来处理任何其他 Form1 实例.使用以下方法，我循环遍历 MDI 子项，但我需要一些帮助，如何关闭除新实例之外的所有其他实例.

I am working on a winforms application using c#. I have an MDI container that has a menu on the left and by pushing a button then the appropriate form is visible. If I click for ex 3 times the button which opens Form1 the 6 instances of the form are opened. Thus I thought that I have to write a method that disposes any other Form1 instances. With the following method, I'm looping through the MDI children, but I want some help how to close all other instances except the new one.

  public void DisposeAllButThis(Form form)
    {
        foreach (Form frm in this.MdiChildren)
        {
            if (frm == form)
            {
                frm.Dispose();
                return;
            }
        }
    }

推荐答案

你也需要检查表单是否是同类型的:

You need to check whether the form is of the same type too:

public void DisposeAllButThis(Form form)
{
    foreach (Form frm in this.MdiChildren)
    {
        if (frm.GetType() == form.GetType() 
            && frm != form)
        {
            frm.Dispose();
            frm.Close();
        }
    }
}

有关关闭和处理的更多信息，请参阅:C# Form.Close vs Form.处置

For more information on Close and Dispose see: C# Form.Close vs Form.Dispose

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