CodeDelegate2.IsDerivedFrom 属性

项目
05/17/2015

指示 CodeDelegate2 对象是否以另一个对象作为基。

命名空间： EnvDTE80
程序集： EnvDTE80（在 EnvDTE80.dll 中）

语法

声明
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 不支持索引属性。

参数

FullName
类型：String

必选。要在此委托的沿袭中搜索的类型。

属性值

类型：Boolean
一个布尔值，如果一个委托以另一个委托作为基，则返回 true；否则返回 false。

备注

在进行某些类型的编辑之后，代码模型元素（如类、结构、函数、特性、委托等）的值可能是非确定性的，这意味着不能指望它们的值总是保持不变。有关更多信息，请参见使用代码模型查找代码 (Visual Basic) 中的“代码模型元素的值可能会更改”一节。

示例

在运行此示例之前，加载一个具有某个类的项目，并插入下行以及代码示例。在添加了该行和代码示例之后，单击 Delegate 行将插入点放在该行处，然后运行该示例。

[VisualBasic]

Delegate Sub MySubDelegate(ByVal x As Integer)

[C#]

public delegate void MySubDelegate(int x);

[VisualBasic]

Public Sub CodeDelegateExample(ByVal dte As DTE2)
    ' Before running this example, open a code document from a 
    ' project and place the insertion point inside a class 
    ' definition.
    Try
        ' Retrieve the CodeClass at the insertion point.
        Dim sel As TextSelection = _
            CType(DTE.ActiveDocument.Selection, TextSelection)
        Dim del As CodeDelegate2 = _
            CType(sel.ActivePoint.CodeElement( _
        vsCMElement.vsCMElementDelegate), CodeDelegate2)
        Dim elem As CodeElement2
        Dim sb As New System.Text.StringBuilder

        ' Display the baseclass name of the delegate.
        sb.AppendLine("Delegate base class name: " & _
          del.BaseClass.Name)
        sb.AppendLine("Delegate's access: " & del.Access.ToString)
        sb.AppendLine("Children: " & del.Children.Count & "  _
          Name: " & del.Children.Item(1).Name)
        sb.AppendLine("Collection: " & del.Collection.Count)
        sb.AppendLine("Delegates:")
        For Each elem In del.Collection
            sb.AppendLine("    - " & elem.Name)
        Next
        sb.AppendLine("Comment: " & del.Comment)
        sb.AppendLine("Doc Comment: " & del.DocComment)
        sb.AppendLine("DTE Parent: " & del.DTE.Name)
        sb.AppendLine("Endpoint location: " & _
          del.EndPoint.AbsoluteCharOffset)
        sb.AppendLine("Infolocation: " & del.InfoLocation.ToString)
        sb.AppendLine("Can provide CodeType object? " & _
          del.IsCodeType.ToString)
        sb.AppendLine("Is Delegate derived? " & _
          del.IsDerivedFrom("EnvDTE80"))
        sb.AppendLine("Is Delegate a generic? " & del.IsGeneric)
        sb.AppendLine("Kind: " & del.Kind.ToString)
        sb.AppendLine("Authoring language: " & _
          del.Language.ToString)
        sb.AppendLine("Name: " & del.Name)
        sb.AppendLine("Namespace: " + del.Namespace.Name);
        sb.AppendLine("Parameters: " & del.Parameters.Item(1).Name)
        sb.AppendLine("Project containing the delegate: " & _
          del.ProjectItem.Name)
        sb.AppendLine("Prototype for delegate: " & del.Prototype)
        sb.AppendLine("Delegate start point offset: " & _
          del.StartPoint.LineCharOffset)
        sb.AppendLine("Type: " & del.Type.TypeKind.ToString)
        MsgBox(sb.ToString)

    Catch ex As System.Exception
        MsgBox(ex.ToString)
    End Try
End Sub

[C#]

public void CodeDelegateExample(DTE2 DTE)
{
    try
    {
        // Retrieve the CodeClass at the insertion point.
        TextSelection sel = (TextSelection) 
          DTE.ActiveDocument.Selection;
        CodeDelegate2 del = (CodeDelegate2) 
          sel.ActivePoint.get_CodeElement
          (vsCMElement.vsCMElementDelegate);
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        // Display the baseclass name of the delegate.
        sb.AppendLine("Delegate base class name: " + 
          del.BaseClass.Name);
        sb.AppendLine("Delegate's access: " + del.Access);
        sb.AppendLine("Children: "+del.Children.Count+"  Name: 
          "+del.Children.Item(1).Name);
        sb.AppendLine("Collection: "+del.Collection.Count);
        sb.AppendLine("Delegates:");
        foreach (CodeElement2 elem in del.Collection )
        {
            sb.AppendLine("    - "+elem.Name);
        }
        sb.AppendLine("Comment: "+del.Comment);
        sb.AppendLine("Attributes:"); 
        foreach (CodeElement2 elem in del.Attributes)
        {
            sb.AppendLine("    - " + elem.Name);
        }
        sb.AppendLine("Bases:");
        foreach (CodeElement2 elem in del.Bases)
        {
            sb.AppendLine("    - " + elem.Name);
        } 
        sb.AppendLine("Doc Comment: " + del.DocComment);
        sb.AppendLine("DTE Parent: "+del.DTE.Name);
        sb.AppendLine("Endpoint location: 
          "+del.EndPoint.AbsoluteCharOffset);
        sb.AppendLine("Infolocation: "+del.InfoLocation);
        sb.AppendLine("Can provide CodeType object? "+del.IsCodeType);
        sb.AppendLine("Is Delegate derived? 
          "+del.get_IsDerivedFrom("EnvDTE80"));
        sb.AppendLine("Is Delegate a generic? "+del.IsGeneric);
        sb.AppendLine("Kind: "+del.Kind);
        sb.AppendLine("Authoring language: "+del.Language);
        sb.AppendLine("Name: "+del.Name);
        sb.AppendLine("Parameters: "+del.Parameters.Item(1).Name);
        sb.AppendLine("Namespace: " + del.Namespace.Name);
        sb.AppendLine("Project containing the delegate: 
          "+del.ProjectItem.Name);
        sb.AppendLine("Delegate start point offset: 
          "+del.StartPoint.LineCharOffset);
        sb.AppendLine("Type: "+del.Type.TypeKind);
          MessageBox.Show(sb.ToString());
    }
    catch(System.Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}