PropertyAttributes 列舉

定義

命名空間:

System.Reflection

組件:

System.Runtime.dll

定義可以與屬性 (Property) 相關聯的屬性 (Attribute)。 這些屬性值都在 corhdr.h 中定義。

此列舉支援其成員值的位元組合。

C#

[System.Flags]
public enum PropertyAttributes

繼承

Object

ValueType

Enum

PropertyAttributes

屬性

FlagsAttribute

欄位

名稱	值	Description
HasDefault	4096	指定屬性具有預設值。
None	0	指定沒有屬性 (Attribute) 與屬性 (Property) 有關。
Reserved2	8192	保留的。
Reserved3	16384	保留的。
Reserved4	32768	保留的。
ReservedMask	62464	指定保留旗標僅供執行階段使用。
RTSpecialName	1024	指定中繼資料 (Metadata) 內部應用程式開發介面檢查名稱編碼方式。
SpecialName	512	指定屬性為特殊屬性，具有描述屬性是如何特殊的名稱。

範例

下列範例會建置三個屬性，並顯示 PropertyAttributes 列舉值。 請注意，只讀屬性沒有 setter，因此無法變更。Caption = statement

C#

using System;
using System.Reflection;

 // Define three properties: one read-write, one default,
 // and one read only.
public class Aproperty
    // Define a read-write property.
{
    private string caption = "A Default caption";
    public string Caption
    {
        get{return caption;}
        set
        {
            if (caption != value){caption = value;}
        }
    }
}
public class Bproperty
    // Define a default property.
{
    private string caption  = "B Default caption";
    public string this [int index]
    {
        get {return "1";}
    }
    public string Caption
    {

        get{return caption;}
        set
        {
            if (caption != value){caption = value;}
        }
    }
}
public class Cproperty
    // Define a read-only property.
{
    private string caption = "C Default caption";
    public string Caption
    {
        get{return caption;}
        // No setting is allowed, because this is a read-only property.
    }
}

class propertyattributesenum
{
    public static int Main(string[] args)
    {
        Console.WriteLine("\nReflection.PropertyAttributes");

        // Determine whether a property exists, and change its value.
        Aproperty Mypropertya = new Aproperty();
        Bproperty Mypropertyb = new Bproperty();
        Cproperty Mypropertyc = new Cproperty();

        Console.Write("\n1. Mypropertya.Caption = " + Mypropertya.Caption );

        Console.Write("\n1. Mypropertyb.Caption = " + Mypropertyb.Caption );

        Console.Write("\n1. Mypropertyc.Caption = " + Mypropertyc.Caption );

        // Only Mypropertya can be changed, as Mypropertyb is read-only.
        Mypropertya.Caption = "A- This is changed.";
        Mypropertyb.Caption = "B- This is changed.";
        // Note that Mypropertyc is not changed because it is read only

        Console.Write("\n\n2. Mypropertya.Caption = " + Mypropertya.Caption );

        Console.Write("\n2. Mypropertyb.Caption = " + Mypropertyb.Caption );

        Console.Write("\n2. Mypropertyc.Caption = " + Mypropertyc.Caption );

        // Get the PropertyAttributes enumeration of the property.
        // Get the type.
        Type MyTypea = Type.GetType("Aproperty");
        Type MyTypeb = Type.GetType("Bproperty");
        Type MyTypec = Type.GetType("Cproperty");

        // Get the property attributes.
        PropertyInfo Mypropertyinfoa = MyTypea.GetProperty("Caption");
        PropertyAttributes Myattributesa = Mypropertyinfoa.Attributes;
        PropertyInfo Mypropertyinfob = MyTypeb.GetProperty("Item");
        PropertyAttributes Myattributesb = Mypropertyinfob.Attributes;
        PropertyInfo Mypropertyinfoc = MyTypec.GetProperty("Caption");
        PropertyAttributes Myattributesc = Mypropertyinfoc.Attributes;

        // Display the property attributes value.

        Console.Write("\n\na- " + Myattributesa.ToString());

        Console.Write("\nb- " + Myattributesb.ToString());

        Console.Write("\nc- " + Myattributesc.ToString());
        return 0;
    }
}

// This example displays the following output to the console
//
// Reflection.PropertyAttributes
//
// 1. Mypropertya.Caption = A Default caption
// 1. Mypropertyb.Caption = B Default caption
// 1. Mypropertyc.Caption = C Default caption
//
// 2. Mypropertya.Caption = A- This is changed.
// 2. Mypropertyb.Caption = B- This is changed.
// 2. Mypropertyc.Caption = C Default caption
//
// a- None
// b- None
// c- None

備註

若要取得 PropertyAttributes，請先取得 類別 Type。 從取得 TypePropertyInfo。 從取得 PropertyInfoAttributes。

列舉值是數位，代表方法上實作之屬性的位 OR。

適用於