从另一个表单访问数组 [英] Access array from another form

问题描述

我的项目中有两个表单（Mainform，SettingWindow）



i想要将数据从一个表单写入另一个表单（数组）

i have two forms in my project (Mainform, SettingWindow)

i want to write data from one form to another (array)

Public Class MainForm 
Public Shared Tags(64) As String
end class

Public Class SettingsWindow
MainForm.Tags(1)= "xxx"
end class

i收到错误消息对象引用未设置为对象的实例。在MainForm.Tags（1）=xxx的行上



它适用于字符串，整数....甚至我的控制数组。但是对于变量数组我得到了这个错误。

i am getting the error message "Object reference not set to an instance of an object." on the line of MainForm.Tags(1)= "xxx"

it is working for string, integer ....even my control arrays. but for array of variables i am getting this error.

推荐答案

这是关于表单协作的流行问题。最强大的解决方案是在表单类中实现适当的接口，并传递接口引用而不是引用Form的整个实例。有关更多详细信息，请参阅我以前的解决方案：如何以两种形式复制列表框之间的所有项目 [ ^ ]。



另请参阅此处的其他解决方案讨论。如果应用程序足够简单，解决方案就像在一个表单中声明一些 internal 属性并将对一个表单的实例的引用传递给另一个表单的实例一样简单形成。对于更复杂的项目，这种违反严格封装的样式和松散耦合可能会增加代码的意外复杂性并引发错误，因此封装良好的解决方案将是优惠。



另请参阅：

http://en.wikipedia.org/wiki/Accidental_complexity [ ^ ]，

http://en.wikipedia.org/wiki/Loose_coupling [ ^ ]。

-SA

This is the popular question about form collaboration. The most robust solution is implementation of an appropriate interface in form class and passing the interface reference instead of reference to a "whole instance" of a Form. Please see my past solution for more detail: How to copy all the items between listboxes in two forms[^].

Please also see other solutions in this discussion. If the application is simple enough, the solution could be as simple as declaring of some internal property in one form and passing a reference to the instance of one form to the instance of another form. For more complex projects, such violation of strictly encapsulated style and loose coupling could add up the the accidental complexity of the code and invite mistakes, so the well-encapsulated solution would be preferable.

Please see also:
http://en.wikipedia.org/wiki/Accidental_complexity[^],
http://en.wikipedia.org/wiki/Loose_coupling[^].

—SA

如果你必须这样做，你可以通过将一个表格中的数组暴露给另一个的公开来实现。

If you must do it, you can do it via a public that exposes the array in a one form to the other.

用于访问任何函数或从一个到另一个的任何变量你必须使用mod ule因为模块是我们在模块中声明后以任何形式访问任何东西的唯一方式

for accessing any function or any variable from one from to another u have to use the module because module is the only way by which we can access the things anywhere in any form once it is declared in module

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