C# 更改 MDI 表单的背景
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Change Background of an MDI Form
提问by sheetal
How can I change the BACKGROUND color of the MDI FORM in C#?
如何在 C# 中更改 MDI 表单的背景颜色？
I changed it using the background color property but the color is not changed.
我使用背景颜色属性更改了它，但颜色没有改变。
What should I do to perform this task?
我应该怎么做才能执行此任务？
采纳答案by djdd87
The actual BackGround colour of the MDI control is based on the colour in the Windows current Theme. You have to physically set the MdiClient control's background inside the WinForm.
MDI 控件的实际背景颜色基于 Windows 当前主题中的颜色。您必须在 WinForm 中物理设置 MdiClient 控件的背景。
// #1
foreach (Control control in this.Controls)
{
// #2
MdiClient client = control as MdiClient;
if (!(client == null))
{
// #3
client.BackColor = GetYourColour();
// 4#
break;
}
}
Edit - Added comments:
编辑 - 添加评论：
We need to loop through the controls in the MdiParent form to find the MdiClient control that gets added when you set the Form to be an MdiParent. Foreach is just a simple iteration of a type through a collection.
We need to find the MdiClient control within the form, so to do this we cast the current control within the loop using the 'as' keyword. Using the 'as' keyword means that if the cast is invalid then the variable being set will be null. Therefore we check to see if 'client' is null. If it is, the current control in the loop is not the MdiClient control. As soon as the variable 'client' is not null, then the control we've got hold of is the MdiClient and we can set its background colour.
Set the backcolour to anything you want. Just replace "GetYourColour()" with whatever colour you want, i.e. Color.White, Color.Blue, Colour.FromArgb(etc)...
As there is only ever 1 MdiClient, there's no point continuing the loop as it's just a waste of processing time. Therefore we call 'break' to exit the loop.
我们需要遍历 MdiParent 表单中的控件，以找到当您将 Form 设置为 MdiParent 时添加的 MdiClient 控件。Foreach 只是一个类型通过集合的简单迭代。
我们需要在表单中找到 MdiClient 控件，为此我们使用 'as' 关键字在循环中强制转换当前控件。使用“as”关键字意味着如果转换无效，则设置的变量将为空。因此，我们检查“client”是否为空。如果是，则循环中的当前控件不是 MdiClient 控件。只要变量'client' 不为空，那么我们掌握的控件就是MdiClient，我们可以设置它的背景颜色。
将背景色设置为您想要的任何颜色。只需将“GetYourColour()”替换为您想要的任何颜色，即 Color.White、Color.Blue、Colour.FromArgb(etc)...
由于只有 1 个 MdiClient，因此没有必要继续循环，因为这只是在浪费处理时间。因此我们调用'break'退出循环。
Let me know if you want anything else explaining.
如果您还想解释什么，请告诉我。
回答by ángelo Joel Cárdenas Velásquez
Write this in your load method of your MDI form.
将此写入 MDI 表单的加载方法中。
Controls.OfType<MdiClient>().FirstOrDefault().BackColor = Color.Purple;
