.net将列表框中的项目添加到同一解决方案中的另一个项目

Question

I'm developping a .NET 4 project with more than one projects. The principal project is a Windows Application within a listbox. In the same solutions I have a Class Library project.

In the code behind in my windows form, I call a function in my class library.

Can I pass my listbox control from my project to my another project in the same solution and add to it items?

thank you

Answer 1

Indeed you can.

But first add a reference to System.Windows.Controls in your Class Library. Then you can have a public method on one of your classes

public void DoSomethingToMyListBox(ListBox list)
{
   list.Clear(); //or whatever
}

However. I would ask you to think about what it is you want to do with this listbox, and why you would need to pass it into another module - generally speaking that's a sign of a flaw in your design.

If for example you want to pass it in because you want to fill it with some items that are coming from a database, and you want to isolate the main Forms project from the database access (a good thing) then you should have your Class Library returning data and you should use the Windows Forms DataBinding components instead.

eg

//on your Form's code
public Form1()
{
   var myThing =new MyClass(); //whatever the class in the class library is called
   var theData = MyClass.GetData(); //GetData returns List<something>
   MyListBox.DataSource=theData;
//if "something" is a class, use the two lines below
 //if something is just a list of strings for example, you don't need to bother
   MyListBox.DisplayMember="name of property on something to display in the list";
   MyListBox.ValueMember="name of property on something to use as list index";

}

Of course I don't know if this is what you want to do :)