Happy pi day, everyone!

Is it insecure to send a password in a `curl` command?

What does 高層ビルに何車線もの道路。mean?

et qui - how do you really understand that kind of phraseology?

Why does a Star of David appear at a rally with Francisco Franco?

Different outputs for `w`, `who`, `whoami` and `id`

What are substitutions for coconut in curry?

This word with a lot of past tenses

As a new Ubuntu desktop 18.04 LTS user, do I need to use ufw for a firewall or is iptables sufficient?

Is it good practice to use Linear Least-Squares with SMA?

Do the common programs (for example: "ls", "cat") in Linux and BSD come from the same source code?

Meme-controlled people

Instead of a Universal Basic Income program, why not implement a "Universal Basic Needs" program?

Why do passenger jet manufacturers design their planes with stall prevention systems?

What exactly is this small puffer fish doing and how did it manage to accomplish such a feat?

Why one should not leave fingerprints on bulbs and plugs?

What is "focus distance lower/upper" and how is it different from depth of field?

Have the tides ever turned twice on any open problem?

Brexit - No Deal Rejection

How to deal with taxi scam when on vacation?

How to plot polar formed complex numbers?

Knife as defense against stray dogs

How do I hide Chekhov's Gun?

If I can solve Sudoku, can I solve the Travelling Salesman Problem (TSP)? If so, how?

How do I cast Class FooObject to class BarObject which both implement interface IObject? [duplicate]

3

2

This question already has an answer here:

• 
  Casting between two types derived from the (same) interface
  
  9 answers
  
  


• 
  Casting between classes that share the same interface
  
  7 answers
  
  


• 
  Casting a interface derived class to another derived class
  
  1 answer
  
  

I have 2 classes which implement the same interface. But somehow I cannot cast them from one to another.

Here's an example:

public interface IObject 
 // ...


public class FooObject : IObject 
 // ...


public class BarObject : IObject 
 // ...

-

If I do it like this, VS will mark it as Cannot convert type 'FooObject' to 'BarObject'

var foo = new FooObject();
var bar = (BarObject)foo; // Build error

-

If I do it like this, there is no build error, but when called, it throw System.InvalidCastException: Unable to cast object of type 'FooObject' to 'BarObject'.

var foo = new FooObject();
var bar = (BarObject)(IObject)foo; // No build error, but InvalidCastException gets thrown

-

So, how do I cast/parse/convert an implementation (FooObject) of an interface (IObject) to another implementation (BarObject) of that same interface?

Solution:

I fixed this by creating an explicit conversion operator:

public class FooObject 
 // ...
 public static explicit operator BarObject(FooObject fooObject)
 
 // ...
 

Thanks to CodeCaster.

c# interface casting implementation

share|improve this question

edited Mar 7 at 15:44

Mason

asked Mar 7 at 15:30

MasonMason

371117

marked as duplicate by CodeCaster c#
Users with the  c# badge can single-handedly close c# questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 7 at 15:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  You can't. Both Cat and Dog can implement IAnimal, but you can't cast one to the other - at least not without writing implicit or explicit conversion operators. What problem are you actually trying to solve?
  
  – CodeCaster
  Mar 7 at 15:31
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @CodeCaster, I created a public static explicit operator BarObject(FooObject fooObject) and that did the trick. Thanks!
  
  – Mason
  Mar 7 at 15:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I just made a similar suggestion here: stackoverflow.com/a/55047697/880990.
  
  – Olivier Jacot-Descombes
  Mar 7 at 15:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you use this extension method, you probably will be right: stackoverflow.com/questions/3672742/…
  
  – MohammadReza Hasanzadeh
  Mar 7 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Olivier nice, that's what that duplicate was missing.
  
  – CodeCaster
  Mar 7 at 16:23
  

  
  
  
  

add a comment | 

3

2

This question already has an answer here:

• 
  Casting between two types derived from the (same) interface
  
  9 answers
  
  


• 
  Casting between classes that share the same interface
  
  7 answers
  
  


• 
  Casting a interface derived class to another derived class
  
  1 answer
  
  

I have 2 classes which implement the same interface. But somehow I cannot cast them from one to another.

Here's an example:

public interface IObject 
 // ...


public class FooObject : IObject 
 // ...


public class BarObject : IObject 
 // ...

-

If I do it like this, VS will mark it as Cannot convert type 'FooObject' to 'BarObject'

var foo = new FooObject();
var bar = (BarObject)foo; // Build error

-

If I do it like this, there is no build error, but when called, it throw System.InvalidCastException: Unable to cast object of type 'FooObject' to 'BarObject'.

var foo = new FooObject();
var bar = (BarObject)(IObject)foo; // No build error, but InvalidCastException gets thrown

-

So, how do I cast/parse/convert an implementation (FooObject) of an interface (IObject) to another implementation (BarObject) of that same interface?

Solution:

I fixed this by creating an explicit conversion operator:

public class FooObject 
 // ...
 public static explicit operator BarObject(FooObject fooObject)
 
 // ...
 

Thanks to CodeCaster.

c# interface casting implementation

share|improve this question

edited Mar 7 at 15:44

Mason

asked Mar 7 at 15:30

MasonMason

371117

marked as duplicate by CodeCaster c#
Users with the  c# badge can single-handedly close c# questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 7 at 15:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  You can't. Both Cat and Dog can implement IAnimal, but you can't cast one to the other - at least not without writing implicit or explicit conversion operators. What problem are you actually trying to solve?
  
  – CodeCaster
  Mar 7 at 15:31
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @CodeCaster, I created a public static explicit operator BarObject(FooObject fooObject) and that did the trick. Thanks!
  
  – Mason
  Mar 7 at 15:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I just made a similar suggestion here: stackoverflow.com/a/55047697/880990.
  
  – Olivier Jacot-Descombes
  Mar 7 at 15:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you use this extension method, you probably will be right: stackoverflow.com/questions/3672742/…
  
  – MohammadReza Hasanzadeh
  Mar 7 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Olivier nice, that's what that duplicate was missing.
  
  – CodeCaster
  Mar 7 at 16:23
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Casting between two types derived from the (same) interface
  
  9 answers
  
  


• 
  Casting between classes that share the same interface
  
  7 answers
  
  


• 
  Casting a interface derived class to another derived class
  
  1 answer
  
  

I have 2 classes which implement the same interface. But somehow I cannot cast them from one to another.

Here's an example:

public interface IObject 
 // ...


public class FooObject : IObject 
 // ...


public class BarObject : IObject 
 // ...

-

If I do it like this, VS will mark it as Cannot convert type 'FooObject' to 'BarObject'

var foo = new FooObject();
var bar = (BarObject)foo; // Build error

-

If I do it like this, there is no build error, but when called, it throw System.InvalidCastException: Unable to cast object of type 'FooObject' to 'BarObject'.

var foo = new FooObject();
var bar = (BarObject)(IObject)foo; // No build error, but InvalidCastException gets thrown

-

So, how do I cast/parse/convert an implementation (FooObject) of an interface (IObject) to another implementation (BarObject) of that same interface?

Solution:

I fixed this by creating an explicit conversion operator:

public class FooObject 
 // ...
 public static explicit operator BarObject(FooObject fooObject)
 
 // ...
 

Thanks to CodeCaster.

c# interface casting implementation

share|improve this question

edited Mar 7 at 15:44

Mason

asked Mar 7 at 15:30

MasonMason

371117

public interface IObject 
 // ...


public class FooObject : IObject 
 // ...


public class BarObject : IObject 
 // ...

var foo = new FooObject();
var bar = (BarObject)foo; // Build error

var foo = new FooObject();
var bar = (BarObject)(IObject)foo; // No build error, but InvalidCastException gets thrown

public class FooObject 
 // ...
 public static explicit operator BarObject(FooObject fooObject)
 
 // ...
 

share|improve this question

edited Mar 7 at 15:44

Mason

asked Mar 7 at 15:30

MasonMason

371117

share|improve this question

edited Mar 7 at 15:44

Mason

asked Mar 7 at 15:30

MasonMason

371117

asked Mar 7 at 15:30

MasonMason

371117

asked Mar 7 at 15:30

MasonMason

371117