如何获得对另一种形式的引用？ [英] How get a reference to another form?

问题描述

表格B需要调用表格A的公共方法。表格B如何使用其名称或任何其他形式获得表格A实例的

引用

方法？是否有可以搜索的表单实例集合？

-

Bill

解决方案

< blockquote>你需要声明并实例化一个新的A实例并从那里引用它



//在formB中

formA f = new formA（）;

f.SomeMethod（）;

" Bill Todd" < [e-mail]>在消息中写道

news：le ******************************** @ 4ax.com ...

表单B需要调用表单A的公共方法。表单B如何使用其名称或任何其他方式获得对表单A实例的引用
方法？是否有可以搜索的表单实例的集合？
-
Bill

创建新实例将不起作用。我需要访问表单A的现有

实例。


我从你的答案中假设.NET框架没有维护

表单实例的集合。


我习惯于一个引用一个表单实例的环境

表单另一个很容易，我很难理解表单是如何形成的？b $ b应该在.NET环境中相互通信。


现在我能看到的唯一方法就是拥有

应用程序的主窗体负责在应用程序中创建每隔一个

无模式窗体。当主窗体创建一个新的

表单实例时，它通过调用静态方法来实现，该方法将主窗体的

引用作为参数并返回对<的引用br />
新表格。这样所有表单都可以引用主表单和

主表单引用所有其他表单。


有没有更好的方法来处理这个？


只有一个例子是数据库应用程序的情况。你不能写
写一个数据库应用程序，其中每个表单都有自己的连接

到数据库。如果表单要共享一个连接对象，他们必须要有一个包含连接的表单的引用

对象。


感谢您对此有任何见解。

-

比尔

如果一个表单创建另一个表单，将第一个表单的引用传递给

第二个表单的构造函数...即formA是第一个表单并且它

创建formB：


FormB formB = new FormB（this）;


并为FormB创建一个构造函数：


Public FormB（FormA formA）

{

}


HTH，


Dale


" Bill Todd" < [e-mail]>在留言中写道

新闻：js ******************************** @ 4ax.com ...

创建新实例将不起作用。我需要访问表单A的现有
实例。

我从你的答案中假设.NET框架没有维护表单实例的集合。

我习惯于一个引用一个表单实例的环境
形成另一个表单实例很容易，我很难理解表单是如何在.NET环境中相互通信的。

现在我能看到的唯一方法就是让
应用程序的主窗体负责在应用程序中创建其他所有无模式窗体。当主窗体创建一个新的窗体实例时，它通过调用一个静态方法来实现，该方法将主窗体的引用作为参数，并返回对新窗体的引用。这样所有表单都可以引用主表单，而主表单引用所有其他表单。

有没有更好的方法来处理这个？

感谢您对此有任何了解。
-
Bill

Form B needs to call a public method of Form A. How can form B get a
reference to the instance of Form A using its name or any other
method? Is there a collection of form instances that can be searched?
--
Bill

解决方案

You''ll need to declare and instantiate a new instance of A and reference it
from there
//Within formB
formA f = new formA();
f.SomeMethod();
"Bill Todd" <[e-mail]> wrote in message
news:le********************************@4ax.com...

Form B needs to call a public method of Form A. How can form B get a
reference to the instance of Form A using its name or any other
method? Is there a collection of form instances that can be searched?
--
Bill

Creating a new Instance will not work. I need access to the existing
instance of Form A.

I assume from your answer that the .NET framework does not maintain a
collection of form instances.

I am accustomed to an environment where referring to one form instance
form another is easy and I am struggling to understand how forms are
supposed to communicate with each other in the .NET environment.

Right now the only method I can see to do this is to have the
application''s main form be responsible for creating every other
modeless form in the application. When the main form creates a new
form instance it does so by calling a static method that takes a
reference to the main form as a parameter and returns a reference to
the new form. That way all forms have a reference to the main form and
the main form has a reference to all other forms.

Is there a better way to handle this?

Just one example is the case of a database applicaiton. You cannot
write a database application where every form has its own connection
to the database. If forms are going to share a connection object they
have to have a reference to the form that contains the connection
object.

Thanks for any insight into this.
--
Bill

If one form creates the other form, pass a reference to the first form to
the constructor of the second form... i.e. formA is the first form and it
creates formB with:

FormB formB = new FormB(this);

and create a constructor for FormB as:

Public FormB(FormA formA)
{
}

HTH,

Dale

"Bill Todd" <[e-mail]> wrote in message
news:js********************************@4ax.com...

Creating a new Instance will not work. I need access to the existing
instance of Form A.

I assume from your answer that the .NET framework does not maintain a
collection of form instances.

I am accustomed to an environment where referring to one form instance
form another is easy and I am struggling to understand how forms are
supposed to communicate with each other in the .NET environment.

Right now the only method I can see to do this is to have the
application''s main form be responsible for creating every other
modeless form in the application. When the main form creates a new
form instance it does so by calling a static method that takes a
reference to the main form as a parameter and returns a reference to
the new form. That way all forms have a reference to the main form and
the main form has a reference to all other forms.

Is there a better way to handle this?

Just one example is the case of a database applicaiton. You cannot
write a database application where every form has its own connection
to the database. If forms are going to share a connection object they
have to have a reference to the form that contains the connection
object.

Thanks for any insight into this.
--
Bill

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