C# 如何使 mdichild 加载到 mdiparent 窗口的中心
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How to make mdichild load at the center of mdiparent window
提问by Srikanth V M
HI all,
大家好，
I have this code in which the window property of making child window load at the center of mdiparent.
我有这段代码，其中使子窗口加载的窗口属性位于 mdiparent 的中心。
Form2 f = new Form2();
f.MdiParent = this;
//center screen is working.
//f.StartPosition = FormStartPosition.CenterScreen;
f.StartPosition = FormStartPosition.CenterParent;
but instead of making the child window pop at the center it loads at the left side. Can anyone help me on this. Please refer the screenshot below.
但不是让子窗口在中心弹出，而是在左侧加载。谁可以帮我这个事。请参考下面的截图。
I have even tried doing the same in vb. Even there i get the same error. I think the property of FormStartPosition.CenterParent is dummy.
我什至尝试在 vb 中做同样的事情。即使在那里我也得到同样的错误。我认为 FormStartPosition.CenterParent 的属性是虚拟的。
回答by Patrick McDonald
I tried showing the child with the MDI container form as owner, but caused an exception for me. You could manually set the location before showing the child as follows:
我尝试将 MDI 容器表单显示为所有者的孩子，但对我造成了异常。您可以在显示孩子之前手动设置位置，如下所示：
Form2 f = new Form2();
f.MdiParent = this;
f.StartPosition = FormStartPosition.Manual;
f.Location = new Point((this.ClientSize.Width - f.Width) / 2,
(this.ClientSize.Height - f.Height) / 2);
f.Show();
EDIT:
编辑：
f.StartPosition = FormStartPosition.CenterScreen;
is the correct way to center an mdichild on its parent form.
是将 mdichild 放在其父窗体上的正确方法。
回答by Fredrik M?rk
I experimented a bit with this, and first came to the same solution as Patrick. But I was bugged by the following statement in the documentation of the StartPositionproperty:
我对此进行了一些试验，首先得出了与 Patrick 相同的解决方案。但是我被属性文档中的StartPosition以下语句所困扰：
You can also position the form to display in the center of the screen or in the center of its parent form for forms such as multiple-document interface (MDI) child forms.
对于多文档界面 (MDI) 子窗体等窗体，您还可以将窗体放置在屏幕中央或父窗体的中央显示。
So, I decided that there must be a way. And there is, though I don't find it all intuitive: set the StartPositionto CenterScreen(notCenterParent):
所以，我决定一定有办法。还有，虽然我觉得这不是很直观：设置StartPosition为CenterScreen（不是CenterParent）：
MdiChildUI form = new MdiChildUI();
form.MdiParent = this;
form.StartPosition = FormStartPosition.CenterScreen;
form.Show();
Of course, you can also set it in the designer instead of in code.
当然，你也可以在设计器中设置，而不是在代码中设置。
回答by danish
Setting start position as center screen works perfect for me.
将开始位置设置为中心屏幕对我来说非常适合。
回答by Aram Afsar
A form has an MdiParentproperty and a Parentproperty.
表单具有MdiParent属性和Parent属性。
Please notice that an MdiParent IS NOTthe parent of MdiChild form.
请注意 MdiParent不是MdiChild 表单的父级。
It is, its MdiParent;
它是，它的 MdiParent；
So CenterToParentMethod is meaningless for these types of forms.
所以CenterToParent方法对于这些类型的表单毫无意义。
You can see the functionality of CenterToParentMethod when you program for multiple monitors application, or when you host a form inside another form by setting its Toplevelproperty to false, and setting its Parentproperty to another form.
当您为多个监视器应用程序编程时，或者当您通过将其Toplevel属性设置为 false 并将其Parent属性设置为另一个表单在另一个表单中托管一个表单时，您可以看到CenterToParent方法的功能。
Good Luck,
祝你好运，
Aram Afsar
阿拉姆·阿夫萨
