对象=什么都没有但仍然存在??? [英] Object = nothing but still exists???
问题描述
我有一个包含数据网格的windows类form2。在Cor的帮助下，我使用这种策略来更好地管理记忆。
在表格一中我有：
dim Matrix_A as form2
Private Sub populateA（）
Dim Matrix_A As new form2
填充网格的方法和显示形式
end sub
后来，在第一次执行populateA之后我希望能够隐藏显示的
使用新信息表单并重新执行populateA。然而，在执行完第一次populateA完成后，完成Matrix_A就没有了。
因为它什么都没有，我怎么能让它消失所以我不会有两个
（令人困惑）显示Matrix_A表格？并且，如果它什么都没有，我怎么能
浏览它的数据网格？
-
mark b
I have a windows class form2 that contains a datagrid. With Cor''s help I am
using this strategy to better manage memory.
In form one I have:
dim Matrix_A as form2
Private Sub populateA()
Dim Matrix_A As New form2
Method to fill grid and display form
end sub
Later, after the first execution of populateA I want to be able to hide the
shown form and reexecute populateA with new information. However, after
executing the first populateA completes Matrix_A is nothing.
Since it is nothing, how can I make it dissappear so I won''t have two
(confusing) Matrix_A forms displayed? And, if it is nothing, how come I can
browse its datagrid?
--
mark b
推荐答案
mark写道：
我有一个包含数据网格的windows类form2。在Cor的帮助下，我使用这种策略来更好地管理记忆。
在表格一中我有：
暗淡的Matrix_A作为形式2
Private Sub populateA（）
Dim Matrix_A As new form2
填充网格和显示形式的方法
结束后
后来，第一次执行后populateA我希望能够隐藏
显示的表单并使用新信息重新执行populateA。然而，在执行完第一个populateA之后，完成Matrix_A就没什么了。
因为它什么都没有，我怎么能让它消失所以我不会有两个
（令人困惑） Matrix_A表格显示？并且，如果它什么都没有，我怎么能浏览它的数据网格？
I have a windows class form2 that contains a datagrid. With Cor''s help I am
using this strategy to better manage memory.
In form one I have:
dim Matrix_A as form2
Private Sub populateA()
Dim Matrix_A As New form2
Method to fill grid and display form
end sub
Later, after the first execution of populateA I want to be able to hide the
shown form and reexecute populateA with new information. However, after
executing the first populateA completes Matrix_A is nothing.
Since it is nothing, how can I make it dissappear so I won''t have two
(confusing) Matrix_A forms displayed? And, if it is nothing, how come I can
browse its datagrid?
这是糟糕的编程。你两次声明Matrix_A变量。
我想你想做的事：
暗淡的Matrix_A as form2
Private Sub populateA（）
Matrix_A =新表格2
Matrix_A.showdialog
填写网格和显示表格的方法
end sub
This is bad programming. You are declaring Matrix_A variable twice.
I think you wanted to do:
dim Matrix_A as form2
Private Sub populateA()
Matrix_A = New form2
Matrix_A.showdialog
Method to fill grid and display form
end sub
你的方法更好，但我仍然得到Matrix_A的多个可见副本如果
我多次执行populateA ..我知道我正在被愚蠢但是我不知道当一个新的Matrix_A到来时（除了点击关闭控制之外）还有新的Matrix_A来关闭原始文件。
-
mark b
我不喜欢垃圾邮件写道：
Your method is better, But I still get multiple visible copies of Matrix_A if
I execute populateA multiple times.. I know I am being dunderheaded but I
just can''t figure out how to close the originals when a new Matrix_A comes
into existance (other than clicking the close control).
--
mark b
"I Don''t Like Spam" wrote:
mark写道：
我有一个包含数据网格的windows类form2。在Cor的帮助下，我使用这种策略来更好地管理记忆。
在表格一中我有：
暗淡的Matrix_A作为形式2
Private Sub populateA（）
Dim Matrix_A As new form2
填充网格和显示形式的方法
结束后
后来，第一次执行后populateA我希望能够隐藏
显示的表单并使用新信息重新执行populateA。然而，在执行完第一个populateA之后，完成Matrix_A就没什么了。
因为它什么都没有，我怎么能让它消失所以我不会有两个
（令人困惑） Matrix_A表格显示？并且，如果它什么都没有，我怎么能浏览它的数据网格？
I have a windows class form2 that contains a datagrid. With Cor''s help I am
using this strategy to better manage memory.
In form one I have:
dim Matrix_A as form2
Private Sub populateA()
Dim Matrix_A As New form2
Method to fill grid and display form
end sub
Later, after the first execution of populateA I want to be able to hide the
shown form and reexecute populateA with new information. However, after
executing the first populateA completes Matrix_A is nothing.
Since it is nothing, how can I make it dissappear so I won''t have two
(confusing) Matrix_A forms displayed? And, if it is nothing, how come I can
browse its datagrid?
这是糟糕的编程。你两次声明Matrix_A变量。
我想你想做：
将Matrix_A变为form2
Private Sub populateA（）
Matrix_A = New form2
Matrix_A.showdialog
填充网格和显示形式的方法
end sub
This is bad programming. You are declaring Matrix_A variable twice.
I think you wanted to do:
dim Matrix_A as form2
Private Sub populateA()
Matrix_A = New form2
Matrix_A.showdialog
Method to fill grid and display form
end sub
mark写道：
你的方法更好，但是如果我多次执行populateA，我仍然可以得到Matrix_A的多个可见副本。我知道我正在被愚弄但我还是想不通如何在新的Matrix_A存在时关闭原件（除了单击关闭控件之外）。
Your method is better, But I still get multiple visible copies of Matrix_A if
I execute populateA multiple times.. I know I am being dunderheaded but I
just can''t figure out how to close the originals when a new Matrix_A comes
into existance (other than clicking the close control).
您如何知道如何关闭Matrix_A？什么假设触发
收盘呢？您可能正在寻找：
dim Matrix_A作为新表格2
Private Sub populateA（）
Matrix_A.Show
做一堆东西
Matrix_A.Close
end sub
How do you know how to close Matrix_A? What is suppose to trigger
closing it? You may be looking for:
dim Matrix_A as new form2
Private Sub populateA()
Matrix_A.Show
Do a bunch of stuff
Matrix_A.Close
end sub
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