Home > Cannot Implicitly > C# Cannot Implicitly Convert Type To Interface

C# Cannot Implicitly Convert Type To Interface


public interface IRegister { string Name {get;set;} } public class ByteRegister : IRegister { ... } public class DoubleWordRegister : IRegister { ... } I then have another class which represents If you run into a similar design problem with generics, let me know whether you were able to apply this trick or not. Normally I would be able to cast an object of IApiDataWithProperties to Event (assuming it is one) and for the compiler to let me do that no problem. Either way, the process is common and therefore the problem must lie in your implementation. this contact form

Implicit implementation versus Explicit implementation0Is it possible to not implement a method inherited from an interface in C#?28C# internal interface with internal implementation2Cast from something Generic of implementing to something Generic Is there two IVehicle interfaces and you are accidentally using the wrong one? –Jesse Webb Apr 13 '12 at 20:38 1 You've left out the details that would allow one Richard -- http://www.grimes.demon.co.uk/workshops/fusionWS.htm http://www.grimes.demon.co.uk/workshops/securityWS.htm Dec 4 '05 #16 This discussion thread is closed Start new discussion Replies have been disabled for this discussion. That is what the following class accomplishes: public class EnumerableGeneric : IEnumerable    where TClass : TInterface {    private IList list;    public EnumerableGeneric(IList list)    {       this.list

C# Cannot Implicitly Convert Type To Interface

This way you could avoid implementing a 3-way dispatch by generalizing the visitor pattern. Why computers represent signed integers using two’s complement Graphs, trees, and origins of humanity Fast and slow if-statements: branch prediction in modern processors Recent Commentsgasoline guns on What really happens when where TApiData : IApiDataWithProperties, class ... (newItem as Event).Log(); Though this is not entirely safe as it can result in null you probably should check for that also var item =

You’ll be auto redirected in 1 second. Having not used .NET 4.0 that slipped my mind completely! This is nicely summarised over on MSDN: Are Generics Covariant, Contra-Variant, or Invariant?. Cannot Implicitly Convert Type To T cheers share|improve this answer edited Nov 27 '14 at 23:03 answered Nov 27 '14 at 22:49 Javad_Amiry 13k33583 add a comment| up vote 0 down vote Short version - you can

Unable to cast object of type 'System.Byte[]' to type 'System.String'. Cannot Implicitly Convert Type Generic List To Generic List For example: public class Adult : IPerson {    // } public class Child : IPerson {    // } public void WhyCoVarianceIsNotAllowed() {    List adults = new List();    I'm using reflection to dynamically create a generic method. http://stackoverflow.com/questions/10147944/implicit-conversion-from-type-to-interface-in-c-sharp-basic-example-works-bu Giraffe g = new Giraffe(); // Implicit conversion to base type is safe.

I get Cannot convert type 'TApiData' to 'Event' Why is this? C# Cannot Implicitly Convert Type Generic If you have a better suggestion as to how to mark this resolved (while retaining the WCF part), I'll change it. –Jordy Boom May 7 '12 at 18:39 1 no, Center trace between two pads Is adding the ‘tbl’ prefix to table names really a problem? The content you requested has been removed.

Cannot Implicitly Convert Type Generic List To Generic List

For example: -> I have an IInterface that contains a Read() method. -> I have an object "obj" that implements IInterface. https://social.msdn.microsoft.com/Forums/vstudio/en-US/7d13ac9f-3864-4afc-a213-45f3f5f92858/converting-a-list-to-a-list-of-interface-references?forum=netfxbcl public class RegisterMap { private List> _blocks; public RegisterMap() { _blocks = new List>(); RegisterBlock block1= new RegisterBlock("Block1", 0); block1.AddRegister(new ByteRegister("Reg1")); block1.AddRegister(new ByteRegister("Reg2")); _blocks.Add(block1); RegisterBlock block2= new RegisterBlock("Block2", 10); block2.AddRegister(new DoubleWordRegister("Reg3")); C# Cannot Implicitly Convert Type To Interface Tags: C# Posted by Igor Ostrovsky C# Subscribe to RSS feed 29 Comments to "Fun with C# generics: down-casting to a generic type" Sashirekha says: May 21, 2008 at 3:27 am Cannot Implicitly Convert Type C# IOW, you dont have to derive all your classes from one base class to get a common behaviour.

In your last sample code that you posted I don't see the benefit of casting doc to ISorable interface. http://mediastartpage.com/cannot-implicitly/cannot-implicitly-convert-type-int-to-string-c.html This does work, even though I don't understand why it needs to be done this way. (Use as, instead of a cast when I have already done an is). –AndySavage Nov Casting is required when information might be lost in the conversion, or when the conversion might not succeed for other reasons. Chris Nov 29 '05 #3 P: n/a jeraldp Normally, if you have objects that support interface "IInterface", your member variable will be defined as type "IInterface" also. Cannot Implicitly Convert Type List To List

E.g. more hot questions question feed lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation A 10 version also exists. navigate here For example: -> I have an IInterface that contains a Read() method. -> I have an object "obj" that implements IInterface.

Also, dynamic typing should have better performance in typical cases than reflection. Cannot Implicitly Convert Type System Collections Generic Ienumerable because, following the object's reference in memory // would tell us that b is pointing to an A instance actually. Summary .NET uses casting to jump from one interface to another in the same class.

We appreciate your feedback.

So, every time you create a new storable class, you have to go an modify all of the methods in your data-managing classes. Regards, Jeff *** Sent via Developersdex http://www.developersdex.com *** Nov 30 '05 #5 P: n/a Stefan Hi, Check out my article, it might be helpful. more hot questions question feed lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Cannot Implicitly Convert Type Void To System Eventhandler C# Why had Dumbledore accepted Lupin's resignation?

up vote 11 down vote I notice that you forgot to ask a question. Subscribed! In this case, the type is actually a generic TApiData which has a where restriction to interface IApiDataWithProperties. his comment is here Twice so far this morning: Implementing nested generic Interfaces share|improve this answer answered Apr 27 '12 at 15:59 Eric Lippert 421k1178721729 add a comment| up vote 2 down vote Only interfaces

I was use the "as" keyword. Chad says: September 9, 2009 at 2:18 pm Thanks. How to harness Jupiter's gravitational energy? However, it cannot convert another type to a value of a nullable type, even if conversionType is the underlying type of the Nullable.To perform the conversion, you can use a casting

But there is a fourth option Recently I was solving just about the same problem. ps why skipping text in angular brackets… Andrew Borodin says: May 30, 2010 at 7:05 am Small typo public override Pair ConstructPair(Node secondNode) { return other.ConstructPair(this); } Andrew Borodin says: May This additional restriction allows us to circumvent the generic covariance issue as the immutable list would not allow the 'illegal' situation to arise. share|improve this answer edited Nov 27 '14 at 23:04 answered Nov 27 '14 at 22:58 Selman Genc 68.9k84293 That's what I've said also but received 3 downvotes... –Konrad Kokosa

Am I right? // so the cast will fail. Or you might need to assign a class variable to a variable of an interface type. public static List Get(Guid companyID) { List myList = new List(); ... We therefore need to find a way of converting / casting IList to IEnumerable.

The issue is that the U and V type variables do not exist in the current context. For example, you might have an integer variable that you need to pass to a method whose parameter is typed as double. Success! But remember that of course the first item in the list is actually a RegisterBlock.

But this still doesn't work for lists, since the list interface allows you both to "put stuff in" and "get stuff out". What is exactly meant by a "data set"? This is the big payoff: the ability to write generic code that can deal with any object in your class hierarchy that implements the specific behaviour it needs. Join them; it only takes a minute: Sign up Cannot convert from generic type to interface up vote 5 down vote favorite 3 I'm getting an error when trying to add

What is the definition of "rare language"? Is one of the reasons for the abstract Node so that you can consume a generic list of nodes: List myModes; And it would be on the consumer to check the pretty much what I said in my answer, but oh well. –vidstige Apr 25 '12 at 21:08 1 Correct, but I wanted it to be clear that the problem was

© Copyright 2017 mediastartpage.com. All rights reserved.