MDI帮助 [英] MDI Help
问题描述
我正在尝试创建一个MDI应用程序。我打开窗户OK
（MDI儿童）。但我不认为我这样做是正确的。
基本上，我在主表单（父母）上声明表格。
frm1 f1;
frm2 f2;
等
每张表格一张。
然后，当我打开表格时，我就这么做：
if（f1！= null）
f1 = new frm1 ;
....
f1.Show（）;
f1.BringToFront（）;
但是，如果我关闭表单，并尝试打开...它会中断...我没有
代码的结束，所以它似乎认为即使f1是
关闭......它不是空的......
我应该如何关闭表格？或者，有更好的方法来做这个吗？
$ div class =h2_lin>解决方案
即使f1关闭了...... '不是空的......
是的 - 什么都不会自动清除字段，所以它*不是* null（也不是
是否收集，因为该领域保持在范围内。
两个解决方案;第一个是挂钩进入Form'的FromCosed事件
并将该字段设置为null - 但这有点杂乱无章，因为它
使得有一个表格的倍数棘手。我个人忘记了字段中的
，只需枚举MdiChildren寻找可能的
表格 - 如果你发现这样，把它带到前面，否则产卵一个新的
并将其作为孩子添加。这样，你不必担心
字段（没有）。你可以做一下show existing /
新表格< x>简单地使用泛型 - 类似于（记事本代码 - 不是
测试）：
void ShowForm< T>（）其中T：Form，new（）{
foreach（MdiChildren中的表格儿童）{
如果（孩子是T）{
child.BringToFront（）;
返回;
}
//找不到
T newForm = new T（）;
newForm.MdiParent = this; //或者......但是......我不记得......
newForm.Show（）;
newForm.BringToFront（）;
}
}
Marc
忘记添加 - 然后你只需要打电话：
ShowForm< Form1>（）;
或者其他什么，其中Form1是Form类型的类名。
12月30日15:43，Marc Gravell< marc.grav ... @ gmail.comwrote：
忘了添加 - 那么你只需要打电话：
ShowForm< Form1>（）;
或者其他什么，其中Form1是班级 - 表单类型的名称。
太棒了！
我会给这个打击。我在这方面相当新手。感谢
帮助，Marc。
I am trying to create an MDI Application. I am opening the windows OK
(MDI Children). But I don''t think I am doing it correctly.
Basically, I declare the forms on the main form (Parent).
frm1 f1;
frm2 f2;
etc
One for each form.
Then, when I open the form, I just do:
if (f1 != null)
f1 = new frm1;
....
f1.Show();
f1.BringToFront();
However, if I close the form, and try open... it breaks... I have no
code for the close, so it seems to think that even though f1 is
closed... it''s not null...
How should I be closing forms? Or, is there a better way to be doing
this?
even though f1 is closed... it''s not null...
Yes - nothing will automatically clear fields, so it *isn''t* null (nor
is it collected, since the field keeps it in-scope).
Two solutions; the first is the hook into the Form''s FromCosed event
and set the field to null - but this is a little scrappy since it
makes having multiples of a form tricky. Personally I''d forget about
the fields, and simply enumerate the MdiChildren looking for a likely
form - if you find such, bring it to the front, else spawn a new one
and add it as a child. This way, you don''t have to worry about the
fields (there aren''t any). And you can probably do the "show existing/
new form<x>" simply with generics - something like (notepad code - not
tested):
void ShowForm<T>() where T : Form, new() {
foreach(Form child in MdiChildren) {
if(child is T) {
child.BringToFront();
return;
}
// not found
T newForm = new T();
newForm.MdiParent = this; // or however... I can''t remember...
newForm.Show();
newForm.BringToFront();
}
}
Marc
Forgot to add - then you would just call:
ShowForm<Form1>();
or whatever, where Form1 is the class-name of a type of Form.
On 30 Dec, 15:43, Marc Gravell <marc.grav...@gmail.comwrote:Forgot to add - then you would just call:
ShowForm<Form1>();
or whatever, where Form1 is the class-name of a type of Form.Fantastic!
I''ll give this a bash. I''m quite a novice at this. Thanks for the
help, Marc.
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