I am trying to instantiate a class from another project but I am facing the error 12886 "Could not find class or interface.
I checked the project property of OrderImporter to reference Tools project but it does not change anything.
Also, I checked in the class browser and everything seem ok. There is even an example how to use my own class but it does not works outside of the project Tools.
Does someone have an idea where I fail?
Thank you!
Sebastien
Project OrderImporter | C:\workspace\Progress\OrderImporter\Test.cls
USING Progress.Lang.*.
USING Tools.StringHelper. <-- Could not find class or interface (12886)
CLASS Test:
METHOD PUBLIC VOID BipBip():
DEFINE VARIABLE arrSplit AS System.Collections.ArrayList NO-UNDO.
arrSplit = Tools.StringHelper:Split("VALUE1*VALUE2*VALUE3", "*").
END METHOD.
END CLASS.
Project Tools | C:\workspace\Progress\Tools\StringHelper.cls
USING Progress.Lang.*.
CLASS Tools.StringHelper:
METHOD STATIC PUBLIC System.Collections.ArrayList Split(
INPUT strValues AS CHARACTER
,INPUT strSeparator AS CHARACTER):
/* doing something */
/* returning something */
RETURN arrReturn.
END METHOD.
END CLASS.
You need to change the PROPATH for the project that needs the other project's class to include an external workspace.
Related
I started learning ASP.NET MVC and I have got some doubt. How do I check if a class is a Model class in MVC. I have PHP Codeigniter background, where all models inherit CI_Model. It was easy to figure out whether a class is a model class or not by checking instanceof operator but in .NET MVC Model class do not extend any class.
So how do I figure out whether a class is a model class through C# Code? How does MVC framework figure out whether the class is model or not. I have renamed folder from "Models" to "Modelss" but still model binding works with ModelState.IsValid. Any help is greatly appreciated.
Most models in an MVC application are plain old CLR objects (POCOs), that often don't have a base class because it isn't needed. You can change that, if you need to.
In the following examples, lets assume you have a object called param coming in from somewhere.
In C#, you can check if an object is of a certain type in a few ways. You can cast the object to the type, and if you don’t get an exception, the cast was successful. This is not the preferred method any longer, but I wanted you to know if was an option.
try {
var myType = (MyModel)param; // cast happens here
// do something with myType
}
catch{
// cast failed
}
Another way is to use the as operator. This is a much better way to do this because no exception is thrown if the cast fails, you just get null in the variable.
var myType = param as MyModel;
if (myType != null) { // you have what you need.
...
}
Another technique is the is operator (another good way). This works similar to as, but returns a Boolean rather than the object, or null, and you can inline it in an if statement to do the cast, and assign to a variable all in one line of code.
if (param is MyModel myType){
// do something with myType
}
If you do add a base class to your models, you can use that type rather than the class name in the examples above. If you want, you can forego the base class and use a marker interface (an interface with no properties, or functions declared in it), and check for that type.
public interface IModel {}
public class MyModel : IModel {
...
}
if (param is IModel myType){
// do something with myType
}
BTW, changing the folder name in the project didn't make any difference because C# works based on namespaces, and not folder structure, for most application types. As long as the folder and class files are included in the project, and the namespace is referenced, all is good.
Hope you find this information useful!
I am having a "weird" situation of my VB.Net modules, as per my understanding, Module in VB.Net means static class so I have implemented a couple of helper modules with couple of functions each, let's have some examples for better explanation (free hand code, may contains syntax problem):
Namespace Helpers
Module HelperA
Public Function FunctionA() As Boolean
Return True
End Function
End Module
End Namespace
Namespace Helpers
Module HelperB
Public Function FunctionB() As Integer
Return 1
End Function
End Module
End Namespace
When I start coding in Visual Studio and type Helpers., both FunctionA() and FunctionB() are show up in the recommended auto-complete dialog which I have not type HelperA or HelperB yet, I have some C#.Net projects with static class and I found such behavior does not apply to C#.Net static class.
It is weird to me and inconvenience since I am now having 50-ish functions under a single namespace, have done some Google but nothing could be find, could anyone suggest a solution (besides change Module to Class) or any keywords to search with?
Any help will be appreciate!
Module doesn't technically mean static class. Static in VB.net (with regard to functions) is Shared, and there is no Shared Class. What I think you want is a sealed/abstract/not-inheritable class with static/shared functions (you'll be able to call the functions without an instance of the parent class, but you'll still have to reference the parent class when calling the function). If that's the case, then do something similar to the following:
Public NotInheritable Class HelperA
Public Shared Function FunctionA() as Boolean
Return True
End Function
End Class
Having said that, the only difference I've found—at least for practical purposes—between a shared function and a module function is that module functions can be called without referencing the module.
My main application contains a ClassA. The main application then loads a module and in that module I would like would to do:
var classA:InterfaceClassA = new ClassA();
It compiles fine but I get this warning:
Warning: YourApplication is a module or application that is directly referenced. This will cause YourApplication and all of its dependencies to be linked in with module.YourModule:Module. Using an interface is the recommended practice to avoid this.
I can't use an interface to generate the new instance, so what is the correct way to do this?
I found an answer in Accessing the parent application from the modules . I created a helper class in the main Application that contains instances of the classes I want to access. In the module I then use:
parentApplication.myModuleHelper.**myClassInstance**.myMethod();
for instance methods and for static class level methods I use:
parentApplication.myModuleHelper.**MyClassInstance**.myMethod()
To get an instance of my class in a module I use this in MyModuleHelper
public function getFullScreenUtil(iFullScreenUtil:IFullScreenUtil , iSystemManager:ISystemManager):FullScreenUtil {
return new FullScreenUtil(iFullScreenUtil , iSystemManager);
}
and this in MyModule:
var _fullScreenUtil:* = parentApplication.moduleHelper.getFullScreenUtil(this , systemManager);
which is all I need for now. I am not sure how I could cast the result of getFullScreenUtil(..) to an actual instance of FullScreenUtil but I expect that it can not be done in modules. Maybe using an interface would provide the solution to that.
I'm following a video tutorial on data binding with Visual Studio / Expression Blend.
In the tutorial the application's custom objects are listed when the presenter clicks on the "+CLR Object" button, but in when I do it, my application's objects are not listed.
What do I need to do to get my application's objects to be listed here?
Do you have a reference between the projects? Seems like the child project is just missing a reference to the parent so they can be picked up.
You also need to make sure that if you are using parameterised constructors that your object also has a default constructor - this problem drove me a bit mad until I realised this.
public class MyThing{
private int _item;
//If this is the only constructor Expression does not show it up
public MyThing(int item){
_item = item;
}
//Expression will only list your object if you add this constructor
//when you also have parameterised constructors
public MyThing(){}
}
I had the same problem. I did not make the classes in my C# code public.
I had this:
class MyClass
needed this:
public class MyClass
I have an FLA file with objects in the library which I have set to be "classes" (In CS3, right click an item in the library select properties, make sure it's set to export for action-script, and has a class name)
For this exercise, let's call the class "MyClass"
If I publish that FLA to an SWC and SWF:
I can load the SWC statically, and instantiate "MyClass" by simply doing:
var inst:MyClass = new MyClasS();
Now, the problem: I'd like to be able to do this at runtime by loading the SWF file using a loader object.
I understand how to access instances which have been created by hand in the FLA before publishing, but what I want to be able to do, is create new instances of the class "MyClass".
I can get a "MovieClip" representing the swf file, I can add it to my displaylist, but I can't seem to get at the classes contained therein. (I hope this makes sense)
Any suggestions for how to attack this would be much appreciated.
Edit : Format code
To complete Christian's answer:
var cls : Class = loader.contentLoaderInfo.applicationDomain.getDefinition("ClassName");
var instance : Object = new cls();
Additionally, it's worth noting that you won't get strong typing (ie. it must be declared as Object) unless the class implements interface which is also defined in your main application. You will then be able to declare the instance variable as the interface and have compile-time access to it's members.
Have a look here; you should be able to extract a class reference by using Loader.contentLoaderInfo.applicationDomain.getDefinition("MyClass").