CodeClass.IsDerivedFrom Property

Returns whether a CodeClass object has another object as a base.

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

Syntax

'Declaration
ReadOnly Property IsDerivedFrom ( _
    FullName As String _
) As Boolean

bool this[
    string FullName
] { get; }

property bool IsDerivedFrom[String^ FullName] {
    bool get (String^ FullName);
}

abstract IsDerivedFrom : 
        FullName:string -> bool with get

JScript does not support indexed properties.

Parameters

• FullName
  Type: System.String

  Required. The type to search for in the lineage of this type.

Property Value

Type: System.Boolean
A Boolean value indicating true if a CodeClass object has another object as a base; false if otherwise.

Remarks

Note

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).

Examples

 Sub IsDerivedFromExample(ByVal dte As DTE2)

    ' Before running this example, open a code document from a project.
    Try
        Dim projItem As ProjectItem = dte.ActiveDocument.ProjectItem
        Dim cm As CodeModel = projItem.ContainingProject.CodeModel

        ' Create a new class.
        Dim cls1 As CodeClass = cm.AddClass("BaseClass", projItem.Name)

        ' Derive a class from the newly created class.
        Dim bases() As Object = {cls1.FullName}
        Dim cls2 As CodeClass = cm.AddClass("DerivedClass", _
            projItem.Name, -1, bases)

        Dim derived As String
        If cls1.IsDerivedFrom(cls2.FullName) Then
            derived &= cls1.Name & " is derived from " & _
                cls2.Name & vbCrLf
        Else
            derived &= cls1.Name & " is not derived from " & _
                cls2.Name & vbCrLf
        End If

        If cls2.IsDerivedFrom(cls1.FullName) Then
            derived &= cls2.Name & " is derived from " & _
                cls1.Name & vbCrLf
        Else
            derived &= cls2.Name & " is not derived from " & _
                cls1.Name & vbCrLf
        End If

        MsgBox(derived)
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

End Sub

public void IsDerivedFromExample(DTE2 dte)
{
    // Before running this example, open a code document from 
    // a project.
    try
    {
        ProjectItem projItem = dte.ActiveDocument.ProjectItem;
        CodeModel cm = projItem.ContainingProject.CodeModel;

        // Create a new class.
        CodeClass cls1 = cm.AddClass("BaseClass", projItem.Name, -1, 
            null, null, vsCMAccess.vsCMAccessPublic);

        // Derive a class from the newly created class.
        object[] bases = {cls1.FullName};
        CodeClass cls2 = cm.AddClass("DerivedClass", projItem.Name, -1, 
            bases, null, vsCMAccess.vsCMAccessPublic);
        string derived = "";

        if (cls1.IsDerivedFrom(cls2.FullName))
            derived += cls1.Name + " is derived from " + 
                cls2.Name + "\n";
        else
            derived += cls1.Name + " is not derived from " + 
                cls2.Name + "\n";

        if (cls2.IsDerivedFrom(cls1.FullName))
            derived += cls2.Name + " is derived from " + 
                cls1.Name + "\n";
        else
            derived += cls2.Name + " is not derived from " + 
                cls1.Name + "\n";

        MessageBox.Show(derived);
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

.NET Framework Security

• Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

See Also

Reference

CodeClass Interface

EnvDTE Namespace

Other Resources

How to: Compile and Run the Automation Object Model Code Examples

Discovering Code by Using the Code Model (Visual Basic)

Discovering Code by Using the Code Model (Visual C#)