DesignerAttribute 类

指定用于为组件实现设计时服务的类。

**命名空间:**System.ComponentModel
**程序集:**System（在 system.dll 中）

语法

声明
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Interface, AllowMultiple:=True, Inherited:=True)> _
Public NotInheritable Class DesignerAttribute
    Inherits Attribute
用法
Dim instance As DesignerAttribute

[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Interface, AllowMultiple=true, Inherited=true)] 
public sealed class DesignerAttribute : Attribute

[AttributeUsageAttribute(AttributeTargets::Class|AttributeTargets::Interface, AllowMultiple=true, Inherited=true)] 
public ref class DesignerAttribute sealed : public Attribute

/** @attribute AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Interface, AllowMultiple=true, Inherited=true) */ 
public final class DesignerAttribute extends Attribute

AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Interface, AllowMultiple=true, Inherited=true) 
public final class DesignerAttribute extends Attribute

备注

用于设计时服务的类必须实现 IDesigner 接口。

使用 DesignerBaseTypeName 属性查找设计器的基类。使用 DesignerTypeName 属性获取与该成员关联的设计器的类型名称。

有关更多信息，请参见 属性 (Attribute) 概述 和 利用属性扩展元数据。

示例

下面的示例创建一个名为 MyForm 的类。MyForm 有两个属性：一个是 DesignerAttribute，用于指定此类使用 DocumentDesigner；另一个是 DesignerCategoryAttribute，用于指定 Form 类别。

<Designer("System.Windows.Forms.Design.DocumentDesigner, System.Windows.Forms.Design.DLL", _
    GetType(IRootDesigner)), DesignerCategory("Form")> _
Public Class MyForm
    
    Inherits ContainerControl
    ' Insert code here.
End Class 'MyForm

[Designer("System.Windows.Forms.Design.DocumentDesigner, System.Windows.Forms.Design.DLL", 
    typeof(IRootDesigner)),
    DesignerCategory("Form")]
public class MyForm : ContainerControl {
    // Insert code here.
}

[Designer("System.Windows.Forms.Design.DocumentDesigner, System.Windows.Forms.Design.DLL",
IRootDesigner::typeid),
DesignerCategory("Form")]
ref class MyForm: public ContainerControl{
   // Insert code here.
};

/** @attribute Designer("System.Windows.Forms.Design.DocumentDesigner,"+
    "System.Windows.Forms.Design.DLL", IRootDesigner.class)
    @attribute DesignerCategory("Form")
 */
public static class MyForm extends ContainerControl
{
    // Insert code here.
} //MyForm

下一个示例创建 MyForm 的实例。然后它获取该类的属性，提取 DesignerAttribute，并输出设计器的名称。

Public Shared Function Main() As Integer
    ' Creates a new form.
    Dim myNewForm As New MyForm()
    
    ' Gets the attributes for the collection.
    Dim attributes As AttributeCollection = TypeDescriptor.GetAttributes(myNewForm)
    
    ' Prints the name of the designer by retrieving the DesignerAttribute
    ' from the AttributeCollection. 
    Dim myAttribute As DesignerAttribute = _
        CType(attributes(GetType(DesignerAttribute)), DesignerAttribute)
    Console.WriteLine(("The designer for this class is: " & myAttribute.DesignerTypeName))
    
    Return 0
End Function 'Main

public static int Main() {
    // Creates a new form.
    MyForm myNewForm = new MyForm();
 
    // Gets the attributes for the collection.
    AttributeCollection attributes = TypeDescriptor.GetAttributes(myNewForm);
 
    /* Prints the name of the designer by retrieving the DesignerAttribute
     * from the AttributeCollection. */
    DesignerAttribute myAttribute = 
       (DesignerAttribute)attributes[typeof(DesignerAttribute)];
    Console.WriteLine("The designer for this class is: " + myAttribute.DesignerTypeName);
  
    return 0;
}

int main()
{
   // Creates a new form.
   MyForm^ myNewForm = gcnew MyForm;

   // Gets the attributes for the collection.
   AttributeCollection^ attributes = TypeDescriptor::GetAttributes( myNewForm );

   /* Prints the name of the designer by retrieving the DesignerAttribute
       * from the AttributeCollection. */
   DesignerAttribute^ myAttribute = dynamic_cast<DesignerAttribute^>(attributes[ DesignerAttribute::typeid ]);
   Console::WriteLine( "The designer for this class is: {0}", myAttribute->DesignerTypeName );
   return 0;
}

public static void main(String[] args)
{
    // Creates a new form.
    MyForm myNewForm = new MyForm();

    // Gets the attributes for the collection.
    AttributeCollection attributes = 
        TypeDescriptor.GetAttributes(myNewForm);

    /* Prints the name of the designer by retrieving the 
       DesignerAttribute from the AttributeCollection. 
     */
    DesignerAttribute myAttribute = (DesignerAttribute)(
        attributes.get_Item(DesignerAttribute.class.ToType()));

    Console.WriteLine(("The designer for this class is: " 
        + myAttribute.get_DesignerTypeName()));
} //main

继承层次结构

System.Object
   System.Attribute
    System.ComponentModel.DesignerAttribute

线程安全

此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。

平台

Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

请参见

参考

DesignerAttribute 成员
System.ComponentModel 命名空间
Attribute