Question

The Microsoft link here lists three methods that we can use.

But how do we get the current namespace?
I see there is a similar question, but the answer to that is using Macros, which doesnt solve this specific question.

The NameSpace() to do something like this:

<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            .
            .
        </Header>
        <Snippet>
            <Declarations>
                <Literal>
                    <ID>namespace</ID> 
                    <Function>NameSpace()</Function>                     
                </Literal>
            </Declarations>
            <Code Language="csharp">
                <![CDATA[
                    $namespace$
                ]]>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>

Answer 1

Found out that it can be done and it brings into picture the classes ExpansionProvider & ExpansionFunction

For the above snippet, I had to do something as such:

internal class NameSpaceExpansionFunction : ExpansionFunction
    {
        public NameSpaceExpansionFunction(ExpansionProvider provider)
            : base(provider)
        {
        }

        public override string GetCurrentValue()
        {
           //get namespace
           return namespace;
        }
    }

And the LanguageService tells the snippet file where to look for definition of the function:

public class MyLanguageService : LanguageService
    {
        public override ExpansionFunction CreateExpansionFunction(ExpansionProvider provider,
                                                                  string functionName)
        {
            ExpansionFunction function = null;
            if (String.Compare(functionName, "NameSpace", true) == 0)
            {
                function = new NameSpaceExpansionFunction(provider);
            }
            return function;
        }
    }

This turned out to be more like a tutorial question hence I have provided the links above. Should be helpful. Worked for me 🙂