CodeClass.AddImplementedInterface Method

Adds an interface to the list of inherited objects.

Namespace:  EnvDTE
Assembly:  EnvDTE (in EnvDTE.dll)

CodeInterface AddImplementedInterface(
	Object Base,
	Object Position


Type: System.Object

Required. The interface the class will implement. This is either a CodeInterface or a fully-qualified type name.

Type: System.Object

Optional. Default = 0. The code element after which to add the new element. If the value is a CodeElement, then the new element is added immediately after it.

If the value is a Long, then AddImplementedInterface indicates the element after which to add the new element.

Because collections begin their count at 1, passing 0 indicates that the new element should be placed at the beginning of the collection. A value of -1 means the element should be placed at the end.

Return Value

Type: EnvDTE.CodeInterface
A CodeInterface object.

AddImplementedInterface adds a reference to an interface that the CodeClass implements. AddImplementedInterface does not insert method stubs for the interface members.

Visual C++ requires the colon-separated (::) format for its fully qualified type names. All other languages support the period-separated format.

The correctness of the arguments is determined by the language behind the code model.


The values of code model elements such as classes, structs, functions, attributes, delegates, and so forth can be non-deterministic after making certain kinds of edits, meaning that their values cannot be relied upon to always remain the same. For more information, see the section Code Model Element Values Can Change in Discovering Code by Using the Code Model (Visual Basic).

public void AddImplementedInterfaceExample(DTE2 dte)
    // Before running this example, open a code document from a project
    // and place the insertion point inside a class definition.
        // Retrieve the CodeClass at the insertion point.
        TextSelection sel = 
        CodeClass cls = 
        CodeModel cm = cls.ProjectItem.ContainingProject.CodeModel;

        // Add a new implemented interface to the class.
            "System.IDisposable"), -1);
    catch (Exception ex)

string ConvertFullName(CodeModel cm, string fullName)
    // Convert a .NET type name into a C++ type name.
    if ((cm.Language == CodeModelLanguageConstants.vsCMLanguageVC) || 
        (cm.Language == CodeModelLanguageConstants.vsCMLanguageMC))
        return fullName.Replace(".", "::");
        return fullName;