The type or namespace name 'var' could not be found in WCF Service Application

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When I am trying to use "var" in the WCF Service application it is giving error "The type or namespace name 'var' could not be found (are you missing a using directive or an assembly reference?)"

You get this error if you try to use var in a class member, e.g.:

public class Foo
{
    var a = 4;
}

var can only be used inside a method, not in classes, fields or method signatures.

See also: Why no var on fields?

Getting "type or namespace name could not be found" but , This can be the result of a .Net framework version incompatibility between two projects. It can happen in two ways: a client profile project� The type or namespace name 'Linq' does not exist in the namespace 'System' (10 answers) Closed 2 years ago . When I want to use button to write code in C# it doesn't go to cs file to write c# code.

I would imagine its because your targeting a framework before c#4.0. Try to go to your projects properties and set the target framework to 4.0

Compiler Error CS0246, The type or namespace name 'type/namespace' could not be found (are you missing a using directive or an assembly reference?) A type or namespace that is used in the program was not found. In my case the problem was that after changing namespace to exactly same as is in another project (intentionally), the name of assembly was changed as well by VS, so there were two assemblies with same name, one overriding the other

For my ASP.NET 3.5 project, I had to make sure that I had the 3.5 framework compiler setup in my web.config file like:

<system.codedom>
  <compilers>
    <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <providerOption name="CompilerVersion" value="v3.5"/>
      <providerOption name="WarnAsError" value="false"/>
    </compiler>
  </compilers>
</system.codedom>

The type or namespace name XXX could not be found(are you , The Project which is is referencing the Assembly may have different framework type from the assembly. for example: Forms Project was set to ". The type or namespace 'system' could not be found in .Net Core app 0 C#: My 1st Azure DevOps Pipeline (“Hello, World!”) - “The type or namespace name 'System' could not be found”

I'm taking a wild guess here, but: var may only be used for local variabels (inside a method).

Are you using it to define instance variables?

CS0246 The type or namespace name 'System' could not be found , For Bugs: I have got below Error in my WTS project. **CS0246 The type or namespace name 'System' could not be found (are you missing a� The type or namespace name 'PrjTest' could not be found (are you missing a using directive or an assembly reference?) I've tried the following to resolve this: Removed Resharper (since Resharper had no trouble recognizing the referenced project, I thought it might be worth a shot) Removed and re-added the reference and using statement

You should ensure, you are building your service for .NET 3.5 or higher. The "var" keyword was not supported before.

[SOLVED] Are you missing a using directive or an assembly , If you want to use another namespace to your project u can follow my tutorial to do that. But you Duration: 1:57 Posted: Jul 14, 2019 Try the suggestions in this MSDN blog post: Why did I receive the error: “The type or namespace ‘<namespace name>’ does not exist in the class or namespace ‘<parent namespace>’ (are you missing an assembly reference?)”

Resolved: The type or namespace name 'App' could not be found , There is common error in xamarin.forms project when you trying to build solution for android or Duration: 3:10 Posted: Mar 6, 2019 The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' HELP! Discussion in 'Scripting' started by Tom-Red, Apr 19, 2016. Tom-Red. Joined:

Getting “type or namespace name could not be found” but , However, inside my code, somewhere VS will give me a notice said "type or namespace name could not be found", till now this only happend� C# The type or namespace name `List' could not be found. But I'm importing System.Collections.Generic; Ask Question Asked 5 years ago. Active 2 months ago.

"The type or namespace name 'Script' does not exist in the , How about one of these: The type or namespace name ' KeyValueConfigurationCollection' could not be found (are you missing a using directive or an assembly�

Comments
  • Can you show us some code / config ?? We can't read your mind (or your screen), really....
  • The reason is that the C# compiler can't infer what type a is. It might be an int, but it could be any other class that has an implicit cast to an int, like a double or MyCustomClass or SomeEnum.
  • @neontapir - That isn't very accurate. 4 is an int literal. var a = 4; is well defined and works as expected in a method's body. It's just that you can't use it outside of a method.
  • OK, fair enough. The usage example above didn't lend itself to what I was trying to say. I should have created a new one. Thanks.
  • It is the compiler that matters here, not the target runtime. VS2008 and above should be fine, no matter which target runtime (unless the language compatibility options are enabled = exceptionally rare).
  • It is the compiler that matters here, not the target runtime. VS2008 and above should be fine, no matter which target runtime (unless the language compatibility options are enabled = exceptionally rare).