CodeElement2 接口

项目
09/04/2008

更新：2007 年 11 月

表示源文件中的代码元素或构造。

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

语法

声明
<GuidAttribute("F03DCCE8-233B-43D7-A66B-A66EFC1F85C3")> _
Public Interface CodeElement2 _
    Implements CodeElement
用法
Dim instance As CodeElement2

[GuidAttribute("F03DCCE8-233B-43D7-A66B-A66EFC1F85C3")]
public interface CodeElement2 : CodeElement

[GuidAttribute(L"F03DCCE8-233B-43D7-A66B-A66EFC1F85C3")]
public interface class CodeElement2 : CodeElement

public interface CodeElement2 extends CodeElement

备注

代码元素可以为任何代码段，但通常，对语言中的每个定义或声明语法都有一个 CodeElement2 对象。这意味着对于文件中大多数顶级定义或声明，或者对于类定义中的任何语法形式等，都有一个相应的 CodeElement2 对象。

说明：
在进行某些类型的编辑之后，代码模型元素（如类、结构、函数、属性、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

Sub IsCodeTypeExample(ByVal dte As DTE2)

    ' NOTE: This example requires a reference to the System.Text 
    '       namespace.

    ' Before running this example, open a code document from a project.
    Dim item As ProjectItem = dte.ActiveDocument.ProjectItem
    Dim sb As New StringBuilder

    RecurseElements(item.FileCodeModel.CodeElements, 0, sb)

    MsgBox(item.Name & " contains the following elements:" & vbCrLf & _
        vbCrLf & sb.ToString())

End Sub

Sub RecurseElements(ByVal elems As CodeElements, _
    ByVal level As Integer, ByVal sb As StringBuilder)

    Dim elem As CodeElement
    For Each elem In elems
        ' Add element to the list of names.
        sb.Append(" "c, level * 8)
        sb.Append(elem.Name & " [" & elem.Kind.ToString() & "]" & _
            vbCrLf)

        ' Call this function recursively if element has children.
        If elem.Kind = vsCMElement.vsCMElementNamespace Then
            RecurseElements(CType(elem, CodeNamespace).Members, _
                level + 1, sb)
        ElseIf elem.IsCodeType Then
            RecurseElements(CType(elem, CodeType).Members, _
                level + 1, sb)
        End If
    Next
End Sub

public void IsCodeTypeExample(DTE2 dte)
{
    // NOTE: This example requires a reference to the System.Text 
    //       namespace.

    // Before running this example, open a code document from a 
    // project.
    ProjectItem item = dte.ActiveDocument.ProjectItem;
    StringBuilder sb = new StringBuilder();

    RecurseElements(item.FileCodeModel.CodeElements, 0, sb);

    MessageBox.Show(item.Name + " contains the following elements:" + 
        Environment.NewLine + Environment.NewLine + sb.ToString());
}

void RecurseElements(CodeElements elems, int level, StringBuilder sb)
{
    foreach (CodeElement elem in elems)
    {
        // Add element to the list of names.
        sb.Append(' ', level * 8);
        sb.Append(elem.Name + " [" + elem.Kind.ToString() + "]" + 
            Environment.NewLine);

        // Call this function recursively if element has children.
        if (elem.Kind == vsCMElement.vsCMElementNamespace)
            RecurseElements(((CodeNamespace)elem).Members, 
                level + 1, sb);
        else if (elem.IsCodeType)
            RecurseElements(((CodeType)elem).Members, level + 1, sb);
    }
}