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Resolve CS0121 in System.Web.Http

Extension methods conflictHow to resolve error with equally named types in method parameters?HttpResponseMessage not working in Web Api (.NET 4.5)Assembly 'System.Web.Http, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Net.Http.Formatting, Version=5.2.3.0Several system libraries missing in a VS Express installFileLoadException Occured for System.Web.HttpAdjusting ambiguous type references on xmlns: xmlns:x and xmlns:cal attributes for precedenceMVC 5 Helper errorHow To Ensure Correct Extension Method ResolutionAmbiguity in parameter type inference for C# lambda expressionsSystem.Net.Http Unavailable for .Net 4.5 Application. Reference Has Been Added

3

This code:

Request.CreateResponse(HttpStatusCode.PartialContent);

Yields following compilation error:

Error CS0121 The call is ambiguous between the following methods or
properties:
'System.Net.Http.HttpRequestMessageExtensions.CreateResponse(System.Net.Http.HttpRequestMessage,
System.Net.HttpStatusCode)' and
'System.Web.Http.HttpRequestMessageCommonExtensions.CreateResponse(System.Net.Http.HttpRequestMessage,
System.Net.HttpStatusCode)'

Both are in System.Net.Http namespace, one in System.Web.Http assembly the other in System.Net.Http.Formatting but I need them both as a reference. Even worse System.Net.Http.HttpRequestMessageExtensions class is present in both assemblies.

As a workaround, I could use this overload, which seems to be in only one of them:

Request.CreateResponse<object>(HttpStatusCode.PartialContent, null);

But is there any other way to resolve the conflict?

[Steps to reproduce]

1. Create a console app


2. Add the reference to System.Net.Http
   


3. Add the reference to System.Net.Http.Formatting from NuGet


4. Add using System.Net.Http
   


5. Add var req = new HttpRequestMessage();
   


6. Try adding req.CreateResponse(HttpStatusCode.OK);
   


7. You should see 12 extension method overloads. Some are duplicated, those are the problem.
   

c# asp.net-web-api2

share|improve this question

edited Mar 22 at 11:27

ZorgoZ

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  VS easily handle this, as I know
  
  – demo
  Mar 21 at 15:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @demo well, it looks not to be able. Anyway, the solution should not be IDE dependant, but rather pure code or config. You can fully qualify a class to resolve conflict, but what can you do with extension methods that are imported from any used namespace unattended?
  
  – ZorgoZ
  Mar 22 at 9:24
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If it's saying its ambiguous then you just have to make it clear. Use the full namespace of the one that you do want to use.
  
  – Archer
  Mar 22 at 11:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Archer please give an example of how to do that in case of an extension method.
  
  – ZorgoZ
  Mar 22 at 11:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you give a Minimal, Complete, and Verifiable example so we can copy/paste & reproduce the issue?
  
  – Archer
  Mar 22 at 11:09
  

  
  
  
  

 | 
show 4 more comments

3

This code:

Request.CreateResponse(HttpStatusCode.PartialContent);

Yields following compilation error:

Error CS0121 The call is ambiguous between the following methods or
properties:
'System.Net.Http.HttpRequestMessageExtensions.CreateResponse(System.Net.Http.HttpRequestMessage,
System.Net.HttpStatusCode)' and
'System.Web.Http.HttpRequestMessageCommonExtensions.CreateResponse(System.Net.Http.HttpRequestMessage,
System.Net.HttpStatusCode)'

Both are in System.Net.Http namespace, one in System.Web.Http assembly the other in System.Net.Http.Formatting but I need them both as a reference. Even worse System.Net.Http.HttpRequestMessageExtensions class is present in both assemblies.

As a workaround, I could use this overload, which seems to be in only one of them:

Request.CreateResponse<object>(HttpStatusCode.PartialContent, null);

But is there any other way to resolve the conflict?

[Steps to reproduce]

1. Create a console app


2. Add the reference to System.Net.Http
   


3. Add the reference to System.Net.Http.Formatting from NuGet


4. Add using System.Net.Http
   


5. Add var req = new HttpRequestMessage();
   


6. Try adding req.CreateResponse(HttpStatusCode.OK);
   


7. You should see 12 extension method overloads. Some are duplicated, those are the problem.
   

c# asp.net-web-api2

share|improve this question

edited Mar 22 at 11:27

ZorgoZ

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  VS easily handle this, as I know
  
  – demo
  Mar 21 at 15:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @demo well, it looks not to be able. Anyway, the solution should not be IDE dependant, but rather pure code or config. You can fully qualify a class to resolve conflict, but what can you do with extension methods that are imported from any used namespace unattended?
  
  – ZorgoZ
  Mar 22 at 9:24
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If it's saying its ambiguous then you just have to make it clear. Use the full namespace of the one that you do want to use.
  
  – Archer
  Mar 22 at 11:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Archer please give an example of how to do that in case of an extension method.
  
  – ZorgoZ
  Mar 22 at 11:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you give a Minimal, Complete, and Verifiable example so we can copy/paste & reproduce the issue?
  
  – Archer
  Mar 22 at 11:09
  

  
  
  
  

 | 
show 4 more comments

This code:

Request.CreateResponse(HttpStatusCode.PartialContent);

Yields following compilation error:

Error CS0121 The call is ambiguous between the following methods or
properties:
'System.Net.Http.HttpRequestMessageExtensions.CreateResponse(System.Net.Http.HttpRequestMessage,
System.Net.HttpStatusCode)' and
'System.Web.Http.HttpRequestMessageCommonExtensions.CreateResponse(System.Net.Http.HttpRequestMessage,
System.Net.HttpStatusCode)'

Both are in System.Net.Http namespace, one in System.Web.Http assembly the other in System.Net.Http.Formatting but I need them both as a reference. Even worse System.Net.Http.HttpRequestMessageExtensions class is present in both assemblies.

As a workaround, I could use this overload, which seems to be in only one of them:

Request.CreateResponse<object>(HttpStatusCode.PartialContent, null);

But is there any other way to resolve the conflict?

[Steps to reproduce]

1. Create a console app


2. Add the reference to System.Net.Http
   


3. Add the reference to System.Net.Http.Formatting from NuGet


4. Add using System.Net.Http
   


5. Add var req = new HttpRequestMessage();
   


6. Try adding req.CreateResponse(HttpStatusCode.OK);
   


7. You should see 12 extension method overloads. Some are duplicated, those are the problem.
   

c# asp.net-web-api2

share|improve this question

edited Mar 22 at 11:27

ZorgoZ

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

Request.CreateResponse(HttpStatusCode.PartialContent);

Request.CreateResponse<object>(HttpStatusCode.PartialContent, null);

share|improve this question

edited Mar 22 at 11:27

ZorgoZ

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

share|improve this question

edited Mar 22 at 11:27

ZorgoZ

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

asked Mar 21 at 15:55

ZorgoZZorgoZ

1,3111517

1 Answer
1

active

oldest

votes

3

In general, you can use extension methods directly to resolve such ambiguities:

Instead of

myRequest.CreateResponse(HttpStatusCode.PartialContent);

use

HttpRequestMessageExtensions.CreateResponse(myRequest, HttpStatusCode.PartialContent);

---

In this specific case, I could not reproduce the issue following your instructions. However, I have downloaded the Microsoft.AspNet.WebApi.Client Nuget instead of the System.Net.Http.Formatting Nuget since the later one is marked as deprecated. Maybe try to update to the newer Nuget?

Update: I can reproduce the issue when also installing the System.Web.Http.Common Nuget and adding using System.Web.Http; to the file. Using the explicit call to the method as shown above resolves the issue.

share|improve this answer

edited Mar 22 at 11:55

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just to make it more challenging, explicit call gives: CS0433 The type 'HttpRequestMessageExtensions' exists in both 'System.Net.Http.Formatting, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' and 'System.Web.Http, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Unfortunatelly, I can't get rid of System.Net.Http.Formatting as it comes with a dependency too. But still looks promising.
  
  – ZorgoZ
  Mar 22 at 13:03
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But it works in the other way around: HttpRequestMessageCommonExtensions.CreateResponse is unambiguous. I have come to this approach before, but I thought that there is something better. Well, thank you for confirming that there isn't.
  
  – ZorgoZ
  Mar 22 at 13:16
  

  
  
  
  

add a comment | 

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3

In general, you can use extension methods directly to resolve such ambiguities:

Instead of

myRequest.CreateResponse(HttpStatusCode.PartialContent);

use

HttpRequestMessageExtensions.CreateResponse(myRequest, HttpStatusCode.PartialContent);

---

In this specific case, I could not reproduce the issue following your instructions. However, I have downloaded the Microsoft.AspNet.WebApi.Client Nuget instead of the System.Net.Http.Formatting Nuget since the later one is marked as deprecated. Maybe try to update to the newer Nuget?

Update: I can reproduce the issue when also installing the System.Web.Http.Common Nuget and adding using System.Web.Http; to the file. Using the explicit call to the method as shown above resolves the issue.

share|improve this answer

edited Mar 22 at 11:55

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just to make it more challenging, explicit call gives: CS0433 The type 'HttpRequestMessageExtensions' exists in both 'System.Net.Http.Formatting, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' and 'System.Web.Http, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Unfortunatelly, I can't get rid of System.Net.Http.Formatting as it comes with a dependency too. But still looks promising.
  
  – ZorgoZ
  Mar 22 at 13:03
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But it works in the other way around: HttpRequestMessageCommonExtensions.CreateResponse is unambiguous. I have come to this approach before, but I thought that there is something better. Well, thank you for confirming that there isn't.
  
  – ZorgoZ
  Mar 22 at 13:16
  

  
  
  
  

add a comment | 

3

In general, you can use extension methods directly to resolve such ambiguities:

Instead of

myRequest.CreateResponse(HttpStatusCode.PartialContent);

use

HttpRequestMessageExtensions.CreateResponse(myRequest, HttpStatusCode.PartialContent);

---

In this specific case, I could not reproduce the issue following your instructions. However, I have downloaded the Microsoft.AspNet.WebApi.Client Nuget instead of the System.Net.Http.Formatting Nuget since the later one is marked as deprecated. Maybe try to update to the newer Nuget?

Update: I can reproduce the issue when also installing the System.Web.Http.Common Nuget and adding using System.Web.Http; to the file. Using the explicit call to the method as shown above resolves the issue.

share|improve this answer

edited Mar 22 at 11:55

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just to make it more challenging, explicit call gives: CS0433 The type 'HttpRequestMessageExtensions' exists in both 'System.Net.Http.Formatting, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' and 'System.Web.Http, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Unfortunatelly, I can't get rid of System.Net.Http.Formatting as it comes with a dependency too. But still looks promising.
  
  – ZorgoZ
  Mar 22 at 13:03
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But it works in the other way around: HttpRequestMessageCommonExtensions.CreateResponse is unambiguous. I have come to this approach before, but I thought that there is something better. Well, thank you for confirming that there isn't.
  
  – ZorgoZ
  Mar 22 at 13:16
  

  
  
  
  

add a comment | 

In general, you can use extension methods directly to resolve such ambiguities:

Instead of

myRequest.CreateResponse(HttpStatusCode.PartialContent);

use

HttpRequestMessageExtensions.CreateResponse(myRequest, HttpStatusCode.PartialContent);

---

In this specific case, I could not reproduce the issue following your instructions. However, I have downloaded the Microsoft.AspNet.WebApi.Client Nuget instead of the System.Net.Http.Formatting Nuget since the later one is marked as deprecated. Maybe try to update to the newer Nuget?

Update: I can reproduce the issue when also installing the System.Web.Http.Common Nuget and adding using System.Web.Http; to the file. Using the explicit call to the method as shown above resolves the issue.

share|improve this answer

edited Mar 22 at 11:55

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363

myRequest.CreateResponse(HttpStatusCode.PartialContent);

HttpRequestMessageExtensions.CreateResponse(myRequest, HttpStatusCode.PartialContent);

share|improve this answer

edited Mar 22 at 11:55

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363

answered Mar 22 at 11:34

NineBerryNineBerry

14.6k23363