UrlPropertyAttribute 建構函式

定義

命名空間:

System.Web.UI

組件:

System.Web.dll

初始化 UrlPropertyAttribute 類別的新執行個體。

多載

名稱	Description
UrlPropertyAttribute()	初始化該類別的新預設實例 UrlPropertyAttribute 。
UrlPropertyAttribute(String)	初始化該類別的新實例 UrlPropertyAttribute ，並將屬性設定 Filter 為指定的字串。

UrlPropertyAttribute()

初始化該類別的新預設實例 UrlPropertyAttribute 。

public:
 UrlPropertyAttribute();

public UrlPropertyAttribute();

Public Sub New ()

範例

以下程式碼範例展示了一個實作 URL 特定屬性的類別。 在這個程式碼範例中，類別的屬性CustomHyperLinkControl被套用TargetUrl一個預設UrlPropertyAttribute屬性。 該屬性表示支援所有 URL 類型，並指定預設檔案過濾器為「*.*」。

public class CustomHyperLinkControl : WebControl
{
    public CustomHyperLinkControl() { }

    // The TargetUrl property represents the URL that 
    // the custom hyperlink control navigates to.
    [UrlProperty()]
    public string TargetUrl
    {
        get
        {
            string s = (string)ViewState["TargetUrl"];
            return ((s == null) ? String.Empty : s);
        }
        set
        {
            ViewState["TargetUrl"] = value;
        }
    }

    // The Text property represents the visible text that 
    // the custom hyperlink control is displayed with.        
    public virtual string Text
    {
        get
        {
            string s = (string)ViewState["Text"];
            return ((s == null) ? String.Empty : s);
        }
        set
        {
            ViewState["Text"] = value;
        }
    }

    // Implement this method to render the control.
}

Public Class CustomHyperLinkControl
    Inherits WebControl

    Public Sub New()
    End Sub

    ' The TargetUrl property represents the URL that 
    ' the custom hyperlink control navigates to.        
    <UrlProperty()> _
    Public Property TargetUrl() As String
        Get
            Dim s As String = CStr(ViewState("TargetUrl"))
            If (s Is Nothing) Then
                Return String.Empty
            Else
                Return s
            End If
        End Get
        Set(ByVal value As String)
            ViewState("TargetUrl") = value
        End Set
    End Property

    ' The Text property represents the visible text that 
    ' the custom hyperlink control is displayed with.        

    Public Overridable Property [Text]() As String
        Get
            Dim s As String = CStr(ViewState("Text"))
            If (s Is Nothing) Then
                Return String.Empty
            Else
                Return s
            End If
        End Get
        Set(ByVal value As String)
            ViewState("Text") = value
        End Set
    End Property

    ' Implement method to render the control.

End Class

備註

該類別的預設實例 UrlPropertyAttribute 會 Filter 以屬性設定為「*.*」初始化。

UrlPropertyAttribute(String)

初始化該類別的新實例 UrlPropertyAttribute ，並將屬性設定 Filter 為指定的字串。

public:
 UrlPropertyAttribute(System::String ^ filter);

public UrlPropertyAttribute(string filter);

new System.Web.UI.UrlPropertyAttribute : string -> System.Web.UI.UrlPropertyAttribute

Public Sub New (filter As String)

參數

filter

String

一個與 URL 特定屬性相關的檔案過濾器。

範例

以下程式碼範例展示了一個實作 URL 特定屬性的類別。 在這個程式碼範例中，一個 UrlPropertyAttribute 屬性被套用到 TargetUrl 類別的 CustomHyperLinkControl 屬性上。 屬性會為 ASP.NET 檔案設定特定的檔案過濾器。

public class CustomHyperLinkControl : WebControl
{
    public CustomHyperLinkControl() { }

    // The TargetUrl property represents the URL that 
    // the custom hyperlink control navigates to.
    [UrlProperty("*.aspx")]
    public string TargetUrl
    {
        get
        {
            string s = (string)ViewState["TargetUrl"];
            return ((s == null) ? String.Empty : s);
        }
        set
        {
            ViewState["TargetUrl"] = value;
        }
    }

    // The Text property represents the visible text that 
    // the custom hyperlink control is displayed with.        
    public virtual string Text
    {
        get
        {
            string s = (string)ViewState["Text"];
            return ((s == null) ? String.Empty : s);
        }
        set
        {
            ViewState["Text"] = value;
        }
    }

    // Implement method to render the control.
}

Public Class CustomHyperLinkControl
    Inherits WebControl

    Public Sub New()
    End Sub

    ' The TargetUrl property represents the URL that 
    ' the custom hyperlink control navigates to.        
    <UrlProperty("*.aspx")> _
    Public Property TargetUrl() As String
        Get
            Dim s As String = CStr(ViewState("TargetUrl"))
            If (s Is Nothing) Then
                Return String.Empty
            Else
                Return s
            End If
        End Get
        Set(ByVal value As String)
            ViewState("TargetUrl") = value
        End Set
    End Property

    ' The Text property represents the visible text that 
    ' the custom hyperlink control is displayed with.                
    Public Overridable Property [Text]() As String
        Get
            Dim s As String = CStr(ViewState("Text"))
            If (s Is Nothing) Then
                Return String.Empty
            Else
                Return s
            End If
        End Get
        Set(ByVal value As String)
            ViewState("Text") = value
        End Set
    End Property

    ' Implement method to render the control.

End Class

備註

使用此建構子建立的類別實例 UrlPropertyAttribute 會以 Filter 屬性初始化為 filter。