PersistChildrenAttribute.IsDefaultAttribute メソッドとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

PersistChildrenAttribute.IsDefaultAttribute メソッド

PersistChildrenAttribute クラスの現在のインスタンスの値を派生クラスの既定値にするかどうかを示す値を返します。

名前空間: System.Web.UI
アセンブリ: System.Web (system.web.dll 内)
構文

Visual Basic (宣言)

Public Overrides Function
 IsDefaultAttribute As Boolean

Visual Basic (使用法)

Dim instance As PersistChildrenAttribute
Dim returnValue As Boolean

returnValue = instance.IsDefaultAttribute

public override bool IsDefaultAttribute ()

C++

public:
virtual bool IsDefaultAttribute () override

public boolean IsDefaultAttribute ()

JScript

public override function IsDefaultAttribute
 () : boolean

戻り値
PersistChildrenAttribute の現在のインスタンスの値が既定のインスタンスである場合は true。それ以外の場合は false。

使用例

IsDefaultAttribute メソッドを使用して、PersistChildrenAttribute クラスの現在のインスタンスが既定のインスタンスと同じかどうかを判断する方法を次のコード例に示します。

このコード例は、PersistChildrenAttribute クラスのトピックで取り上げているコード例の一部分です。

Visual Basic

<%@ Page Language="VB" %>
<%@ Register TagPrefix="AspSample" Assembly="Samples.AspNet.VB.Controls"
 Namespace="PersistChildrenSampleVB"
 %>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  
  Protected Sub Page_Load(ByVal
 sender As Object, ByVal
 e As System.EventArgs)

    ' Create two new employees and add them to the custom control.
    Dim e1 As New Employee("Employee
 1", "Title 1", "Alias
 1")
    Dim e2 As New Employee("Employee
 2", "Title 2", "Alias
 2")
    CollectionPropertyControl1.Employees.Add(e1)
    CollectionPropertyControl1.Employees.Add(e2)

    ' Verify attribute values.
    Dim p As PersistChildrenAttribute = _
    Attribute.GetCustomAttribute(GetType(CollectionPropertyControl),
 _
    GetType(PersistChildrenAttribute))

    Dim sb As New StringBuilder()
    sb.Append("The Persist property is " & p.Persist.ToString()
 & "<br>")
    sb.Append("The UseCustomPersistence property is "
 & p.UsesCustomPersistence.ToString() & "<br>")
    sb.Append("The IsDefault method returns " &
 p.IsDefaultAttribute().ToString())
    Message.Text = sb.ToString()

  End Sub
  
</script>


<html  >
<head id="Head1" runat="server">
    <title>PersistChildrenAttribute</title>
</head>
<body>
    <form id="Form1" runat="server">
    <div>
      <asp:Label ID="Message"
                 runat="server"/>
      <AspSample:CollectionPropertyControl id="CollectionPropertyControl1"
 
                                           runat="server">
      </AspSample:CollectionPropertyControl>
    </div>
    </form>
</body>
</html>

<%@ Page Language="C#" %>
<%@ Register TagPrefix="AspSample" Assembly="Samples.AspNet.CS.Controls"
 Namespace="PersistChildrenSamples" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  
  protected void Page_Load(object sender, EventArgs
 e)
  {

    // Create two new employees and add them to the custom control.
    Employee e1 = new Employee("Employee 1", "Title
 1", "Alias 1");
    Employee e2 = new Employee("Employee 2", "Title
 2", "Alias 2");
    CollectionPropertyControl1.Employees.Add(e1);
    CollectionPropertyControl1.Employees.Add(e2);

    // Verify attribute values.
    PersistChildrenAttribute p =
      (PersistChildrenAttribute)Attribute.GetCustomAttribute(typeof(CollectionPropertyControl),
 
      typeof(PersistChildrenAttribute));

    StringBuilder sb = new StringBuilder();
    sb.Append("The Persist property is " + p.Persist.ToString() + "<br>");
    sb.Append("The UseCustomPersistence property is " + p.UsesCustomPersistence.ToString()
 + "<br>");
    sb.Append("The IsDefault method returns " + p.IsDefaultAttribute().ToString());
    Message.Text = sb.ToString();
    
  }
</script>

<html  >
<head runat="server">
    <title>PersistChildrenAttribute</title>
</head>
<body>
    <form runat="server">
    <div>
      <asp:Label ID="Message"
                 runat="server"/>
      <AspSample:CollectionPropertyControl id="CollectionPropertyControl1"
 
                                           runat="server">
      </AspSample:CollectionPropertyControl>
    </div>
    </form>
</body>
</html>