UrlPropertyAttribute Class
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Defines the attribute that controls use to identify string properties containing URL values. This class cannot be inherited.
public ref class UrlPropertyAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Property)]
public sealed class UrlPropertyAttribute : Attribute
[<System.AttributeUsage(System.AttributeTargets.Property)>]
type UrlPropertyAttribute = class
inherit Attribute
Public NotInheritable Class UrlPropertyAttribute
Inherits Attribute
- Inheritance
- Attributes
The following code example demonstrates a class that implements a URL-specific property. In this code example, a UrlPropertyAttribute attribute is applied to the TargetUrl
property of the CustomHyperLinkControl
class. The attribute sets a specific file filter for ASP.NET files.
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
The UrlPropertyAttribute attribute is an attribute applied to a control property that represents a URL. In addition to marking a string property as representing a URL, the UrlPropertyAttribute attribute defines the Filter property that identifies specific file types that can be used to filter against the property.
Url |
Initializes a new default instance of the UrlPropertyAttribute class. |
Url |
Initializes a new instance of the UrlPropertyAttribute class, setting the Filter property to the specified string. |
Filter |
Gets a file filter associated with the URL-specific property. |
Type |
When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute) |
Equals(Object) |
Returns a value that indicates whether this instance is equal to a specified object. |
Get |
Returns the hash code for this instance. |
Get |
Gets the Type of the current instance. (Inherited from Object) |
Is |
When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute) |
Match(Object) |
When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute) |
Memberwise |
Creates a shallow copy of the current Object. (Inherited from Object) |
To |
Returns a string that represents the current object. (Inherited from Object) |
_Attribute. |
Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute) |
_Attribute. |
Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute) |
_Attribute. |
Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute) |
_Attribute. |
Provides access to properties and methods exposed by an object. (Inherited from Attribute) |
Prodotto | Versioni |
---|---|
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
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