UrlPropertyAttribute 构造函数

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

初始化 UrlPropertyAttribute 类的新实例。

重载

UrlPropertyAttribute()	初始化 UrlPropertyAttribute 类的新默认实例。
UrlPropertyAttribute(String)	初始化 UrlPropertyAttribute 类的新实例，将 Filter 属性设置为指定的字符串。

UrlPropertyAttribute()

初始化 UrlPropertyAttribute 类的新默认实例。

public:
 UrlPropertyAttribute();

public UrlPropertyAttribute ();

Public Sub New ()

示例

下面的代码示例演示了实现特定于 URL 的属性的类。 在此代码示例中，默认 UrlPropertyAttribute 特性应用于 TargetUrl 类的 CustomHyperLinkControl 属性。 属性指示支持所有 URL 类型，并指定默认文件筛选器设置为“*.*”。

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

注解

类的默认实例 UrlPropertyAttribute 使用 Filter 属性设置为值“*.*”进行初始化。

UrlPropertyAttribute(String)

初始化 UrlPropertyAttribute 类的新实例，将 Filter 属性设置为指定的字符串。

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)

参数

filter

String

与 URL 特定属性关联的文件筛选器。

示例

下面的代码示例演示了实现特定于 URL 的属性的类。 在此代码示例中，特性 UrlPropertyAttribute 应用于 TargetUrl 类的 CustomHyperLinkControl 属性。 属性为 ASP.NET 文件设置特定的文件筛选器。

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

注解

使用此构造函数创建的类的 UrlPropertyAttribute 实例初始化， Filter 属性设置为 filter。