Get data from a derived class..
My samples.
public class Maintest
{
public string name = "2";
}
public class test : Maintest
{
string bla = name;
}
or
public class test : Maintest
{
test child = new test();
string bla = child.name;
}
Please reply
or
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For example there is the main class
and I have a derived class that will output data of the first class.
As an example, I just wanted to pass the value of the derivative in the main class. For a proper understanding
If you return the field from a property, it might look a little something like this.
using System;
public class Program
{
public void Main()
{
var test = new Test();
Console.WriteLine(test.greeting);
}
}
// make this abstract if you're never directly instantiate MainTest
public abstract class MainTest
{
public string name = "world";
}
public class Test : MainTest
{
public string greeting {get { return "Hello " + name;}}
}
http://dotnetfiddle.net/R8kwh3
Also, you can enforce a contract by doing something like
public abstract class MainTest
{
public string name = "world";
// create an abstract property to ensure it gets implemented in the inheriting class
public abstract string greeting {get; private set;}
}
public class Test : MainTest
{
public override string greeting {get { return "Hello " + name;}}
}
Maybe you want get data in method? Therefore, you can use this:
public class test : Maintest
{
public string GetData()
{
return name;
}
}
Related
I have an abstract domain class containing a uid field, looking as below:
public abstract class GraphEntityWithUid extends GraphEntity {
private String uid = CommonUtils.newUid();
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
}
And, an abstract repository for it:
public abstract interface GraphEntityWithUidRepository<T extends GraphEntityWithUid> extends GraphRepository<T> {
public T findByUid(String uid);
}
I have a concrete domain class that inherits the uid, looking as below:
#NodeEntity
public class Attachment extends GraphEntityWithUid {
...
}
And, its repository looks as below:
public interface AttachmentRepository extends GraphEntityWithUidRepository<Attachment> {
}
Now, when I use the findByUid method as below:
// returns null
attachmentRepository.findByUid(uid);
it always returns null. However, if I re-declare the method in the AttachmentRepository as below, it works properly:
public interface AttachmentRepository extends GraphEntityWithUidRepository<Attachment> {
// Shouldn't this be automatically inherited??
public Attachment findByUid(String uid);
}
Why should I need to re-declare findByUid method in AttachmentRepository? Shouldn't it be automatically inherited from GraphEntityWithUidRepository?
I would like to retrieve a property but when a dot is used, I can't, I get null,
Is there a way to do it still using #ConfigurationProperties ?
See the example:
#Component
#ConfigurationProperties(prefix = "prop.foo")
public class Test {
//This is working
private String myVal;
//This is not working
private String barAnotherVal;
public void setMyVal(String myVal) {
this.myVal= myVal;
}
public void setBarAnotherVal(String barAnotherVal) {
this.barAnotherVal= barAnotherVal;
}
}
application.properties:
prop.foo.myVal
prop.foo.bar.anotherVal
To set barAnotherVal on Test your property needs to be prop.foo.barAnotherValue.
If you want to use prop.foo.bar.anotherValue then you need a property for bar on Test. The bar type should then have the anotherValue property. Something like this:
#Component
#ConfigurationProperties(prefix = "prop.foo")
public class Test {
private String myVal;
private Bar bar = new Bar();
public void setMyVal(String myVal) {
this.myVal = myVal;
public Bar getBar() {
return this.bar;
}
public static class Bar {
private String anotherVal;
public void setAnotherVal(String anotherVal) {
this.anotherVal = anotherVal;
}
}
}
I have an interface and a class in the tyle ibrary that is produced the interface appears and so does the class but the class has no methods exposed on it. so I cannot create an Application object in say VBA in Microsoft Word and call the methods on it, does anyone know what is wrong?
[ComVisible(true), Guid("261D62BE-34A4-4E49-803E-CC3294613505")]
public interface IApplication
{
[DispId(207)]
[ComVisible(true)]
IExporter Exporter { get; }
[DispId(202)]
[ComVisible(true)]
object CreateEntity([In] kEntityType EntityType, [In] object aParent);
[DispId(208)]
[ComVisible(true)]
string GenerateSpoolFileSpec();
}
[ComVisible(true), Guid("BA7F4588-0B51-476B-A885-8E1436EA0768")]
public class Application : IApplication
{
protected Exporter FExporter;
public Application()
{
FExporter = new Exporter();
}
[DispId(207)]
[ComVisible(true)]
public IExporter Exporter
{
get {return FExporter;}
}
[DispId(202)]
[ComVisible(true)]
public object CreateEntity([In] kEntityType EntityType, [In] object aParent)
{
switch (EntityType)
{
case TypeJob:
return new Job(this, aParent);
case kappEntityType.kappEntityTypePage:
return new Page(this, aParent);
}
return null;
}
[DispId(208)]
[ComVisible(true)]
public string GenerateSpoolFileSpec()
{
string path = string.Format(JOB_PARAMS_PATH_SKELETON, SpoolFolder, DateTime.Now.ToString("yyyy.MM.dd.hh.mm.ss.fff"));
return path;
}
}
Got it, don’t let dotnet handle it for you on the interface put an interfacetype e.g.
[ComVisible(true), Guid("261D62BE-34A4-4E49-803E-CC3294613505"), InterfaceType(ComInterfaceType.InterfaceIsDual)]
On the class use a classinterface e.g
[ComVisible(true), Guid("BA7F4588-0B51-476B-A885-8E1436EA0768"), ClassInterface(ClassInterfaceType.None)]
public interface IFoo {}
public class Foo : IFoo {}
public sealed class NinjaModule : NinjectModule //Appropriately configured in project
{
public override void Load()
{
Bind<IFoo>.To<Foo>.InTransientScope();
}
}
public class SomeOtherClass : ISomeOtherInterface
{
public SomeOtherClass();
public IFoo GetFoo(IFoo foo)
{
return foo;
}
public void GetFoos()
{
foreach (var thing in everything)
{
var localFoo = GetFoo();
localFoo.UniqueProperty = "I am unique";
_fooList.Add(localFoo);
}
}
}
I need my code to look something like that.
Yes, I am fairly new to inject. I am fairly certain that I am missing a basic principle.
Thanks for any help.
I think the best approach here would be to use a factory to create the different Foo instances. And with Ninject and the Factory extension that's pretty easy.
public sealed class NinjaModule : NinjectModule //Appropriately configured in project
{
public override void Load()
{
Bind<IFoo>().To<Foo>().InTransientScope();
Bind<IFooFactory>().ToFactory();
}
}
public interface IFooFactory
{
IFoo CreateFoo();
}
public class SomeOtherClass : ISomeOtherInterface
{
private IFooFactory fooFactory;
public SomeOtherClass(IFooFactory fooFactory)
{
this.fooFactory = fooFactory;
}
public IFoo GetFoo(IFoo foo)
{
return this.fooFactory.CreateFoo();
}
public void GetFoos()
{
foreach (var thing in everything)
{
var localFoo = GetFoo();
localFoo.UniqueProperty = "I am unique";
_fooList.Add(localFoo);
}
}
}
This was a bad question. I figured out this needed to be implemented higher up by the class controlling these implementations.
I have a Singleton class that uses the thread-safe Singleton pattern from Jon Skeet as seen in the TekPub video. The class represents a cached list of reference data for dropdowns in an MVC 3 UI.
To get the list data the class calls a static method on a static class in my DAL.
Now I'm moving into testing an I want to implement an interface on my DAL class but obviously cannot because it is static and has only one static method so there's no interface to create. So I want to remove the static implementation so I can do the interface.
By doing so I can't call the method statically from the reference class and because the reference class is a singleton with a private ctor I can't inject the interface. How do I get around this? How do I get my interface into the reference class so that I can have DI and I can successfully test it with a mock?
Here is my DAL class in current form
public static class ListItemRepository {
public static List<ReferenceDTO> All() {
List<ReferenceDTO> fullList;
... /// populate list
return fullList;
}
}
This is what I want it to look like
public interface IListItemRepository {
List<ReferenceDTO> All();
}
public class ListItemRepository : IListItemRepository {
public List<ReferenceDTO> All() {
List<ReferenceDTO> fullList;
... /// populate list
return fullList;
}
}
And here is my singleton reference class, the call to the static method is in the CheckRefresh call
public sealed class ListItemReference {
private static readonly Lazy<ListItemReference> instance =
new Lazy<ListItemReference>(() => new ListItemReference(), true);
private const int RefreshInterval = 60;
private List<ReferenceDTO> cache;
private DateTime nextRefreshDate = DateTime.MinValue;
public static ListItemReference Instance {
get { return instance.Value; }
}
public List<SelectListDTO> SelectList {
get {
var lst = GetSelectList();
lst = ReferenceHelper.AddDefaultItemToList(lst);
return lst;
}
}
private ListItemReference() { }
public ReferenceDTO GetByID(int id) {
CheckRefresh();
return cache.Find(item => item.ID == id);
}
public void InvalidateCache() {
nextRefreshDate = DateTime.MinValue;
}
private List<SelectListDTO> GetSelectList() {
CheckRefresh();
var lst = new List<SelectListDTO>(cache.Count + 1);
cache.ForEach(item => lst.Add(new SelectListDTO { ID = item.ID, Name = item.Name }));
return lst;
}
private void CheckRefresh() {
if (DateTime.Now <= nextRefreshDate) return;
cache = ListItemRepository.All(); // Here is the call to the static class method
nextRefreshDate = DateTime.Now.AddSeconds(RefreshInterval);
}
}
}
You can use the singleton based on instance(not based on static), for which you can declare interface like this.
public interface IListItemRepository
{
List<ReferenceDTO> All();
}
public class ListItemRepository : IListItemRepository
{
static IListItemRepository _current = new ListItemRepository();
public static IListItemRepository Current
{
get { return _current; }
}
public static void SetCurrent(IListItemRepository listItemRepository)
{
_current = listItemRepository;
}
public List<ReferenceDTO> All()
{
.....
}
}
Now, you can mock IListItemRepository to test.
public void Test()
{
//arrange
//If Moq framework is used,
var expected = new List<ReferneceDTO>{new ReferneceDTO()};
var mock = new Mock<IListItemRepository>();
mock.Setup(x=>x.All()).Returns(expected);
ListItemRepository.SetCurrent(mock.Object);
//act
var result = ListItemRepository.Current.All();
//Assert
Assert.IsSame(expected, result);
}
Which DI framework are you using? Depending on your answer, IOC container should be able to handle single-instancing so that you don't have to implement your own singleton pattern in the caching class. In your code you would treat everything as instanced classes, but in your DI framework mappings you would be able to specify that only one instance of the cache class should ever be created.
One way to test it would be if you refactor your ListItemReference by adding extra property:
public sealed class ListItemReference {
...
public Func<List<ReferenceDTO>> References = () => ListItemRepository.All();
...
private void CheckRefresh() {
if (DateTime.Now <= nextRefreshDate) return;
cache = References();
nextRefreshDate = DateTime.Now.AddSeconds(RefreshInterval);
}
}
And then in your test you could do:
ListItemReference listReferences = new ListItemReference();
listReferences.References = () => new List<ReferenceDTO>(); //here you can return any mock data
Of course it's just temporary solution and I would recommend getting rid of statics by using IoC/DI.