如何在c#中访问面板中的控件
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How to access controls that is in the panel in c#
提问by qulzam
I use a panel in c# winforms and fill the panel with the no of picture box using loop
我在 c# winforms 中使用了一个面板，并使用循环用图片框的编号填充面板
For example, panel name is panal
例如，面板名称是 panal
foreach (string s in fileNames)
{
PictureBox pbox = new new PictureBox();
pBox.Image = Image.FromFile(s);
pbox.Location = new point(10,15);
.
.
.
.
this.panal.Controls.Add(pBox);
}
now I want to change the location of picturebox in another method. The problem is that how can now I access the pictureboxes so that I change the location of them. I try to use the following but it is not the success.
现在我想用另一种方法更改图片框的位置。问题是我现在如何访问图片框以便更改它们的位置。我尝试使用以下方法，但没有成功。
foreach (Control p in panal.Controls)
if (p.GetType == PictureBox)
p.Location.X = 50;
But there is an error. The error is:
但是有一个错误。错误是：
System.Windows.Forms.PictureBox' is a 'type' but is used like a 'variable'
采纳答案by C. Ross
There appear to be some typos in this section (and possibly a real error).
本节中似乎有一些拼写错误（可能是真正的错误）。
foreach (Control p in panal.Controls)
if (p.GetType == PictureBox.)
p.Location.X = 50;
The typos are
错别字是
- PictureBox is followed by a period (.)
- GetType is missing the parens (so it isn't called).
- PictureBox 后跟一个句点 (.)
- GetType 缺少括号（因此未调用）。
The error is:
错误是：
- You can't compare the type of pto PictureBox, you need to compare it to the type of PictureBox.
- 您无法将p的类型与 PictureBox 进行比较，您需要将其与 PictureBox 的类型进行比较。
This should be:
这应该是：
foreach (Control p in panal.Controls)
if (p.GetType() == typeof(PictureBox))
p.Location = new Point(50, p.Location.Y);
Or simply:
或者干脆：
foreach (Control p in panal.Controls)
if (p is PictureBox)
p.Location = new Point(50, p.Location.Y);
回答by qulzam
Don't you want
你不想要
panel.Controls
//^ this is an 'e'
instead of
代替
panal.Controls?
//^ this is an 'a'
回答by Fooberichu
In your second block the period after p.GetType == PictureBox is wrong (no period required here)... for that matter, GetType is a method/function not a Property so it needs to be p.GetType()
在您的第二个块中 p.GetType == PictureBox 之后的句号是错误的（此处不需要句号）...就此而言，GetType 是一个方法/函数而不是一个属性，因此它需要是 p.GetType()
回答by David Basarab
Next there might be some bugs in your for loop.
接下来，您的 for 循环中可能存在一些错误。
foreach (Control p in panel.Controls)
{
if (p is PictureBox) // Use the keyword is to see if P is type of Picturebox
{
p.Location.X = 50;
}
}
回答by tom.dietrich
You would be better off making the picturebox a private variable of the form itself, so that you could do things with it without having to step though the panel's controls every time.
您最好将图片框设为表单本身的私有变量，这样您就可以使用它进行操作，而不必每次都遍历面板的控件。
回答by MusiGenesis
Try this:
尝试这个：
foreach (Control p in panal.Controls)
{
if (p is PictureBox)
{
p.Left = 50;
}
}
回答by Birkan Tu?cu
I think
我认为
foreach (PictureBox p in panel.Controls.OfType<PictureBox>())
{
p.Location = new Point(50, p.Location.Y);
}
could be solution too.
也可以是解决方案。
