ReadOnlyAttribute.IsReadOnly 屬性

定義

命名空間:

System.ComponentModel

組件:

System.ComponentModel.Primitives.dll

來源:

ReadOnlyAttribute.cs

取得值，表示這個屬性 (Attribute) 繫結的內容 (Property) 是否為唯讀。

public:
 property bool IsReadOnly { bool get(); };

public bool IsReadOnly { get; }

member this.IsReadOnly : bool

Public ReadOnly Property IsReadOnly As Boolean

屬性值

Boolean

如果這個屬性 (Attribute) 繫結的屬性 (Property) 是唯讀的則為 true；如果屬性是可讀取/寫入的則為 false。

範例

下列程式代碼範例會檢查是否 MyProperty 為唯讀。 首先，程式代碼會執行下列動作來取得 MyProperty 的屬性：

• PropertyDescriptorCollection擷取 具有物件之所有屬性的 。

• 編制索引以 PropertyDescriptorCollection 取得 MyProperty。

• 將此屬性的屬性儲存在屬性變數中。

然後程式代碼會將 設定myAttribute為中的 AttributeCollection 值ReadOnlyAttribute，並檢查 屬性是否為唯讀。

// Gets the attributes for the property.
AttributeCollection^ attributes = TypeDescriptor::GetProperties( this )[ "MyProperty" ]->Attributes;

// Checks to see whether the property is read-only.
ReadOnlyAttribute^ myAttribute = dynamic_cast<ReadOnlyAttribute^>(attributes[ ReadOnlyAttribute::typeid ]);
if ( myAttribute->IsReadOnly )
{
   // Insert code here.
}

// Gets the attributes for the property.
AttributeCollection attributes = 
   TypeDescriptor.GetProperties(this)["MyProperty"].Attributes;

// Checks to see whether the property is read-only.
ReadOnlyAttribute myAttribute = 
   (ReadOnlyAttribute)attributes[typeof(ReadOnlyAttribute)];

if(myAttribute.IsReadOnly) {
   // Insert code here.
}

' Gets the attributes for the property.
Dim attributes As AttributeCollection = _
   TypeDescriptor.GetProperties(Me)("MyProperty").Attributes
       
' Checks to see whether the property is read-only.
Dim myAttribute As ReadOnlyAttribute = _
   CType(attributes(GetType(ReadOnlyAttribute)), ReadOnlyAttribute)
   
If myAttribute.IsReadOnly Then
    ' Insert code here.
End If

另請參閱

• ReadOnlyAttribute
• Attribute
• PropertyDescriptor
• AttributeCollection
• PropertyDescriptorCollection