AttributeUsageAttribute 類別

定義

指定另一個屬性 (Attribute) 類別的使用方法。Specifies the usage of another attribute class. 這個類別無法被繼承。This class cannot be inherited.

public ref class AttributeUsageAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public sealed class AttributeUsageAttribute : Attribute
type AttributeUsageAttribute = class
    inherit Attribute
Public NotInheritable Class AttributeUsageAttribute
Inherits Attribute
繼承
AttributeUsageAttribute
屬性

備註

當您要定義自己的屬性類別時, 可以在屬性類別AttributeUsageAttribute上放置來控制其使用方式。When you are defining your own attribute class, you can control the manner in which it is used by placing an AttributeUsageAttribute on your attribute class. 指定的屬性類別必須是直接Attribute或間接衍生自。The indicated attribute class must derive from Attribute, either directly or indirectly.

屬性類別具有位置和具名引數。Attribute classes have positional and named parameters. 屬性類別的每個公用函式都會定義該類別的有效位置參數序列。Each public constructor for an attribute class defines a valid sequence of positional parameters for that class. 具名引數是由屬性類別的非靜態、公用和讀寫欄位或屬性所定義。Named parameters are defined by the non-static, public, and read-write fields or properties of the attribute class.

的三個屬性AttributeUsageAttribute是藉由定義下列參數來設定:The three properties of AttributeUsageAttribute are set by defining the following parameters:

這個位置參數會指定可放置指定屬性的程式元素。This positional parameter specifies the program elements that the indicated attribute can be placed on. 您可以放置屬性的所有可能專案集會列在AttributeTargets列舉中。The set of all possible elements that you can place an attribute on is listed in the AttributeTargets enumeration. 您可以使用位AttributeTargets or 運算結合數個值, 以取得所需的有效程式元素組合。You can combine several AttributeTargets values using a bitwise OR operation to get the desired combination of valid program elements.

這個指名的參數會指定指定的程式專案是否可以多次指定指示的屬性。This named parameter specifies whether the indicated attribute can be specified more than once for a given program element.

這個具名引數會指定衍生類別是否可以繼承指定的屬性, 以及覆寫成員。This named parameter specifies whether the indicated attribute can be inherited by derived classes and overriding members.

如需使用屬性的詳細資訊, Attribute請參閱和屬性For more information about using attributes, see Attribute and Attributes.

建構函式

AttributeUsageAttribute(AttributeTargets)

使用指定的 AttributeUsageAttribute 清單、AttributeTargets 值和 AllowMultiple 值,初始化 Inherited 類別的新執行個體。Initializes a new instance of the AttributeUsageAttribute class with the specified list of AttributeTargets, the AllowMultiple value, and the Inherited value.

屬性

AllowMultiple

取得或設定布林值 (Boolean),指出所指定屬性的幾個執行個體能否指定給單一程式項目。Gets or sets a Boolean value indicating whether more than one instance of the indicated attribute can be specified for a single program element.

Inherited

取得或設定 Boolean 值,判斷指示的屬性是否由衍伸類別繼承並覆寫成員。Gets or sets a Boolean value that determines whether the indicated attribute is inherited by derived classes and overriding members.

TypeId

在衍生類別中實作時,取得這個 Attribute 的唯一識別碼。When implemented in a derived class, gets a unique identifier for this Attribute.

(繼承來源 Attribute)
ValidOn

取得一組數值,辨識哪些程式項目可套用所指定的屬性。Gets a set of values identifying which program elements that the indicated attribute can be applied to.

方法

Equals(Object)

傳回值,這個值指出此執行個體是否與指定的物件相等。Returns a value that indicates whether this instance is equal to a specified object.

(繼承來源 Attribute)
GetHashCode()

傳回這個執行個體的雜湊碼。Returns the hash code for this instance.

(繼承來源 Attribute)
GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(繼承來源 Object)
IsDefaultAttribute()

在衍生類別中覆寫時,表示這個執行個體的值是衍生類別的預設值。When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(繼承來源 Attribute)
Match(Object)

在衍生類別中覆寫時,會傳回值,表示這個執行個體是否等於指定物件。When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(繼承來源 Attribute)
MemberwiseClone()

建立目前 Object 的淺層複本 (Shallow Copy)。Creates a shallow copy of the current Object.

(繼承來源 Object)
ToString()

傳回代表目前物件的字串。Returns a string that represents the current object.

(繼承來源 Object)

明確介面實作

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

將一組名稱對應至一組對應的分派識別項 (Dispatch Identifier)。Maps a set of names to a corresponding set of dispatch identifiers.

(繼承來源 Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

擷取物件的類型資訊,可以用來取得介面的類型資訊。Retrieves the type information for an object, which can be used to get the type information for an interface.

(繼承來源 Attribute)
_Attribute.GetTypeInfoCount(UInt32)

擷取物件提供的類型資訊介面數目 (0 或 1)。Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(繼承來源 Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

提供物件所公開的屬性和方法的存取權。Provides access to properties and methods exposed by an object.

(繼承來源 Attribute)

適用於

另請參閱