ParseChildrenAttribute Oluşturucular
Tanım
Önemli
Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.
ParseChildrenAttribute sınıfının yeni bir örneğini başlatır.
Aşırı Yüklemeler
ParseChildrenAttribute() |
ParseChildrenAttribute sınıfının yeni bir örneğini başlatır. |
ParseChildrenAttribute(Boolean) |
Bir sunucu denetiminde yer alan öğelerin sunucu denetiminin özellikleri olarak ayrıştırılıp ayrıştırılamadığını belirlemek için özelliğini kullanarak ChildrenAsProperties sınıfının yeni bir örneğini ParseChildrenAttribute başlatır. |
ParseChildrenAttribute(Type) |
Bir sunucu denetiminde ParseChildrenAttribute yer alan öğelerin denetim olarak ayrıştırıldığını belirlemek için özelliğini kullanarak ChildControlType sınıfının yeni bir örneğini başlatır. |
ParseChildrenAttribute(Boolean, String) |
ve |
ParseChildrenAttribute()
ParseChildrenAttribute sınıfının yeni bir örneğini başlatır.
public:
ParseChildrenAttribute();
public ParseChildrenAttribute ();
Public Sub New ()
Açıklamalar
özelliği olarak ayarlanmış false
şekilde sınıfının yeni bir örneği ParseChildrenAttribute oluşturulurChildrenAsProperties.
Ayrıca bkz.
Şunlara uygulanır
ParseChildrenAttribute(Boolean)
Bir sunucu denetiminde yer alan öğelerin sunucu denetiminin özellikleri olarak ayrıştırılıp ayrıştırılamadığını belirlemek için özelliğini kullanarak ChildrenAsProperties sınıfının yeni bir örneğini ParseChildrenAttribute başlatır.
public:
ParseChildrenAttribute(bool childrenAsProperties);
public ParseChildrenAttribute (bool childrenAsProperties);
new System.Web.UI.ParseChildrenAttribute : bool -> System.Web.UI.ParseChildrenAttribute
Public Sub New (childrenAsProperties As Boolean)
Parametreler
- childrenAsProperties
- Boolean
true
öğeleri sunucu denetiminin özellikleri olarak ayrıştırmak için; aksi takdirde , false
.
Örnekler
Bu bölümdeki kod örneği iki bölümden oluşur. İlk kod örneği, sınıfı için ParseChildrenAttribute özelliklerin nasıl ayarlandığını gösterir. İkinci kod örneği, sınıfların bir ASP.NET sayfasında nasıl kullanılacağını gösterir.
Aşağıdaki kod örneğinde adlı CollectionPropertyControl
özel bir sunucu denetimi için nesnesinin ParseChildrenAttribute nasıl ayarlanacağı gösterilmektedir.
ParseChildrenAttribute öğesini tanımlayan CollectionPropertyControl
ParseChildrenAttribute sınıftan önce bildirildiğinde, özelliği olarak true
ayarlanırChildrenAsProperties.
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
// Create a class that will be rendered as a child of the control
// that has the ParseChildren attribute applied to it.
[AspNetHostingPermission(SecurityAction.Demand,
Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class Employee
{
private String name;
private String title;
private String alias;
public Employee():this ("","",""){}
public Employee (String name, String title, String alias)
{
this.name = name;
this.title = title;
this.alias = alias;
}
public String Name
{
get
{
return name;
}
set
{
name = value;
}
}
public String Title
{
get
{
return title;
}
set
{
title = value;
}
}
public String Alias
{
get
{
return alias;
}
set
{
alias = value;
}
}
}
// Use this Boolean version of the ParseChildrenAttribute constructor
// to set the ChildrenAsProperties property to true. Any properties of the
// the CollectionPropertyControl custom control will be used as parsable
// children.
[ParseChildren(true)]
[AspNetHostingPermission(SecurityAction.Demand,
Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class CollectionPropertyControl : Control
{
private String header;
private ArrayList employees = new ArrayList();
public String Header
{
get
{
return header;
}
set
{
header = value;
}
}
public ArrayList Employees
{
get
{
return employees;
}
}
// Override the CreateChildControls method to
// add child controls to the Employees property when this
// custom control is requested from a page.
protected override void CreateChildControls()
{
Label label = new Label();
label.Text = Header;
label.BackColor = System.Drawing.Color.Beige;
label.ForeColor = System.Drawing.Color.Red;
Controls.Add(label);
Controls.Add(new LiteralControl("<BR> <BR>"));
Table table = new Table();
TableRow htr = new TableRow();
TableHeaderCell hcell1 = new TableHeaderCell();
hcell1.Text = "Name";
htr.Cells.Add(hcell1);
TableHeaderCell hcell2 = new TableHeaderCell();
hcell2.Text = "Title";
htr.Cells.Add(hcell2);
TableHeaderCell hcell3 = new TableHeaderCell();
hcell3.Text = "Alias";
htr.Cells.Add(hcell3);
table.Rows.Add(htr);
table.BorderWidth = 2;
table.BackColor = System.Drawing.Color.Beige;
table.ForeColor = System.Drawing.Color.Red;
foreach (Employee employee in Employees)
{
TableRow tr = new TableRow();
TableCell cell1 = new TableCell();
cell1.Text = employee.Name;
tr.Cells.Add(cell1);
TableCell cell2 = new TableCell();
cell2.Text = employee.Title;
tr.Cells.Add(cell2);
TableCell cell3 = new TableCell();
cell3.Text = employee.Alias;
tr.Cells.Add(cell3);
table.Rows.Add(tr);
}
Controls.Add(table);
}
}
}
Imports System.Collections
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
' Create a class that will be rendered as a child of the control
' that has the ParseChildren attribute applied to it.
<AspNetHostingPermission(SecurityAction.Demand, _
Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class Employee
Private _name As String
Private _title As String
Private _alias As String
Public Sub New()
Me.New("", "", "")
End Sub
Public Sub New(ByVal name As String, ByVal title As String, ByVal employeeAlias As String)
Me._name = name
Me._title = title
Me._alias = employeeAlias
End Sub
Public Property Name() As String
Get
Return _name
End Get
Set(ByVal value As String)
_name = Value
End Set
End Property
Public Property Title() As String
Get
Return _title
End Get
Set(ByVal value As String)
_title = Value
End Set
End Property
Public Property [Alias]() As String
Get
Return _alias
End Get
Set(ByVal value As String)
_alias = Value
End Set
End Property
End Class
' Use this Boolean version of the ParseChildrenAttribute constructor
' to set the ChildrenAsProperties property to true. Any properties of the
' the CollectionPropertyControl custom control will be used as parsable
' children.
<ParseChildren(True)> _
<AspNetHostingPermission(SecurityAction.Demand, _
Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CollectionPropertyControl
Inherits Control
Private _header As String
Private _employees As New ArrayList()
Public Property Header() As String
Get
Return _header
End Get
Set(ByVal value As String)
_header = Value
End Set
End Property
Public ReadOnly Property Employees() As ArrayList
Get
Return _employees
End Get
End Property
' Override the CreateChildControls method to
' add child controls to the Employees property when this
' custom control is requested from a page.
Protected Overrides Sub CreateChildControls()
Dim label As New Label()
label.Text = Header
label.BackColor = System.Drawing.Color.Beige
label.ForeColor = System.Drawing.Color.Red
Controls.Add(label)
Controls.Add(New LiteralControl("<BR> <BR>"))
Dim table As New Table()
Dim htr As New TableRow()
Dim hcell1 As New TableHeaderCell()
hcell1.Text = "Name"
htr.Cells.Add(hcell1)
Dim hcell2 As New TableHeaderCell()
hcell2.Text = "Title"
htr.Cells.Add(hcell2)
Dim hcell3 As New TableHeaderCell()
hcell3.Text = "Alias"
htr.Cells.Add(hcell3)
table.Rows.Add(htr)
table.BorderWidth = Unit.Pixel(2)
table.BackColor = System.Drawing.Color.Beige
table.ForeColor = System.Drawing.Color.Red
Dim employee As Employee
For Each employee In Employees
Dim tr As New TableRow()
Dim cell1 As New TableCell()
cell1.Text = employee.Name
tr.Cells.Add(cell1)
Dim cell2 As New TableCell()
cell2.Text = employee.Title
tr.Cells.Add(cell2)
Dim cell3 As New TableCell()
cell3.Text = employee.Alias
tr.Cells.Add(cell3)
table.Rows.Add(tr)
Next employee
Controls.Add(table)
End Sub
End Class
End Namespace ' ParseChildrenSampleVB_2
Aşağıdaki kod örneği, bir ASP.NET sayfasında ve Employee
sınıflarının nasıl kullanılacağını CollectionPropertyControl
gösterir. Sınıfın Employee
bir örneği bildirim temelli olarak, diğeri ise program aracılığıyla eklenir.
<%@ Page Language="C#" %>
<%@ Register TagPrefix="AspSample" Assembly="Samples.AspNet.CS.Controls" Namespace="Samples.AspNet.CS.Controls" %>
<!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 a new employee object and add it to the custom control.
Employee e1 = new Employee("Employee 2", "Title 2", "Alias 2");
CollectionPropertyControl1.Employees.Add(e1);
// Verify attribute values.
ParseChildrenAttribute p =
(ParseChildrenAttribute)Attribute.GetCustomAttribute(typeof(CollectionPropertyControl),
typeof(ParseChildrenAttribute));
StringBuilder sb = new StringBuilder();
sb.Append("The ChildControlType property is " + p.ChildControlType.ToString() + "<br />");
sb.Append("The ChildrenAsProperties property is " + p.ChildrenAsProperties.ToString() + "<br />");
sb.Append("The IsDefaultAttribute method returns " + p.IsDefaultAttribute().ToString());
Message.Text = sb.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ParseChildrenAttribute Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Message"
runat="server"/>
<AspSample:CollectionPropertyControl id="CollectionPropertyControl1"
runat="server">
<Employees>
<AspSample:Employee Name="Employee 1"
Title="Title 1"
Alias="Alias 1" />
</Employees>
</AspSample:CollectionPropertyControl>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Register TagPrefix="AspSample" Assembly="Samples.AspNet.VB.Controls" Namespace="Samples.AspNet.VB.Controls" %>
<!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 a new employee object and add it to custom control.
Dim e1 As New Employee("Employee 2", "Title 2", "Alias 2")
CollectionPropertyControl1.Employees.Add(e1)
' Verify attribute values.
Dim p As ParseChildrenAttribute = _
Attribute.GetCustomAttribute(GetType(CollectionPropertyControl), _
GetType(ParseChildrenAttribute))
Dim sb As New StringBuilder()
sb.Append("The ChildControlType property is " & p.ChildControlType.ToString() & "<br />")
sb.Append("The ChildrenAsProperties property is " & p.ChildrenAsProperties.ToString() & "<br />")
sb.Append("The IsDefaultAttribute method returns " & p.IsDefaultAttribute().ToString())
Message.Text = sb.ToString()
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<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">
<Employees>
<AspSample:Employee Name="Employee 1"
Title="Title 1"
Alias="Alias 1" />
</Employees>
</AspSample:CollectionPropertyControl>
</div>
</form>
</body>
</html>
Açıklamalar
ise childrenAsProperties
false
, sunucu denetiminde yer alan öğeler bir denetim olarak ayrıştırılır.
false
için ParseChildrenAttributevarsayılan değerdir.
Ayrıca bkz.
Şunlara uygulanır
ParseChildrenAttribute(Type)
Bir sunucu denetiminde ParseChildrenAttribute yer alan öğelerin denetim olarak ayrıştırıldığını belirlemek için özelliğini kullanarak ChildControlType sınıfının yeni bir örneğini başlatır.
public:
ParseChildrenAttribute(Type ^ childControlType);
public ParseChildrenAttribute (Type childControlType);
new System.Web.UI.ParseChildrenAttribute : Type -> System.Web.UI.ParseChildrenAttribute
Public Sub New (childControlType As Type)
Parametreler
- childControlType
- Type
Özellik olarak ayrıştırmak için denetim türü.
Özel durumlar
childControlType
, null
değeridir.
Ayrıca bkz.
Şunlara uygulanır
ParseChildrenAttribute(Boolean, String)
ve defaultProperty
parametrelerini kullanarak sınıfının yeni bir örneğini ParseChildrenAttributechildrenAsProperties
başlatır.
public:
ParseChildrenAttribute(bool childrenAsProperties, System::String ^ defaultProperty);
public ParseChildrenAttribute (bool childrenAsProperties, string defaultProperty);
new System.Web.UI.ParseChildrenAttribute : bool * string -> System.Web.UI.ParseChildrenAttribute
Public Sub New (childrenAsProperties As Boolean, defaultProperty As String)
Parametreler
- childrenAsProperties
- Boolean
true
öğeleri sunucu denetiminin özellikleri olarak ayrıştırmak için; aksi takdirde , false
.
- defaultProperty
- String
İç içe içeriğin varsayılan olarak ayrıştırıldığı sunucu denetiminin koleksiyon özelliğini tanımlayan dize.
Örnekler
Bu bölümdeki kod örneği iki bölümden oluşur. İlk kod örneği, sınıfı için ParseChildrenAttribute özelliklerin nasıl ayarlandığını gösterir. İkinci kod örneği, sınıfların bir ASP.NET sayfasında nasıl kullanılacağını gösterir.
Aşağıdaki kod örneğinde adlı CollectionPropertyControl
özel bir sunucu denetiminin nesnesinin nasıl ayarlanacağı ParseChildrenAttribute gösterilmektedir. , ParseChildrenAttribute özelliğini olarak, özelliğini true
ise DefaultProperty sınıfına Employee
ayarlarChildrenAsProperties.
// Use the ParseChildren attribute to set the ChildrenAsProperties
// and DefaultProperty properties. Using this constructor, the
// control parses all child controls as properties and must define
// a public property named Employees, which it declares as
// an ArrayList. Nested (child) elements must correspond to
// child elements of the Employees property or to other
// properties of the control.
[ParseChildren(true, "Employees")]
[AspNetHostingPermission(SecurityAction.Demand,
Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class CollectionPropertyControl : Control
{
private String header;
private ArrayList employees = new ArrayList();
public String Header
{
get
{
return header;
}
set
{
header = value;
}
}
public ArrayList Employees
{
get
{
return employees;
}
}
// Override the CreateChildControls method to
// add child controls to the Employees property when this
// custom control is requested from a page.
protected override void CreateChildControls()
{
Label label = new Label();
label.Text = Header;
label.BackColor = System.Drawing.Color.Beige;
label.ForeColor = System.Drawing.Color.Red;
Controls.Add(label);
Controls.Add(new LiteralControl("<BR> <BR>"));
Table table = new Table();
TableRow htr = new TableRow();
TableHeaderCell hcell1 = new TableHeaderCell();
hcell1.Text = "Name";
htr.Cells.Add(hcell1);
TableHeaderCell hcell2 = new TableHeaderCell();
hcell2.Text = "Title";
htr.Cells.Add(hcell2);
TableHeaderCell hcell3 = new TableHeaderCell();
hcell3.Text = "Alias";
htr.Cells.Add(hcell3);
table.Rows.Add(htr);
table.BorderWidth = 2;
table.BackColor = System.Drawing.Color.Beige;
table.ForeColor = System.Drawing.Color.Red;
foreach (Employee employee in Employees)
{
TableRow tr = new TableRow();
TableCell cell1 = new TableCell();
cell1.Text = employee.Name;
tr.Cells.Add(cell1);
TableCell cell2 = new TableCell();
cell2.Text = employee.Title;
tr.Cells.Add(cell2);
TableCell cell3 = new TableCell();
cell3.Text = employee.Alias;
tr.Cells.Add(cell3);
table.Rows.Add(tr);
}
Controls.Add(table);
}
}
' Use the ParseChildren attribute to set the ChildrenAsProperties
' and DefaultProperty properties. Using this constructor, the
' control parses all child controls as properties and must define
' a public property named Employees, which it declares as
' an ArrayList. Nested (child) elements must correspond to
' child elements of the Employees property or to other
' properties of the control.
<ParseChildren(True, "Employees")> _
<AspNetHostingPermission(SecurityAction.Demand, _
Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CollectionPropertyControl
Inherits Control
Private _header As String
Private _employees As New ArrayList()
Public Property Header() As String
Get
Return _header
End Get
Set(ByVal value As String)
_header = Value
End Set
End Property
Public ReadOnly Property Employees() As ArrayList
Get
Return _employees
End Get
End Property
' Override the CreateChildControls method to
' add child controls to the Employees property when this
' custom control is requested from a page.
Protected Overrides Sub CreateChildControls()
Dim label As New Label()
label.Text = Header
label.BackColor = System.Drawing.Color.Beige
label.ForeColor = System.Drawing.Color.Red
Controls.Add(label)
Controls.Add(New LiteralControl("<BR> <BR>"))
Dim table As New Table()
Dim htr As New TableRow()
Dim hcell1 As New TableHeaderCell()
hcell1.Text = "Name"
htr.Cells.Add(hcell1)
Dim hcell2 As New TableHeaderCell()
hcell2.Text = "Title"
htr.Cells.Add(hcell2)
Dim hcell3 As New TableHeaderCell()
hcell3.Text = "Alias"
htr.Cells.Add(hcell3)
table.Rows.Add(htr)
table.BorderWidth = Unit.Pixel(2)
table.BackColor = System.Drawing.Color.Beige
table.ForeColor = System.Drawing.Color.Red
Dim employee As Employee
For Each employee In Employees
Dim tr As New TableRow()
Dim cell1 As New TableCell()
cell1.Text = employee.Name
tr.Cells.Add(cell1)
Dim cell2 As New TableCell()
cell2.Text = employee.Title
tr.Cells.Add(cell2)
Dim cell3 As New TableCell()
cell3.Text = employee.Alias
tr.Cells.Add(cell3)
table.Rows.Add(tr)
Next employee
Controls.Add(table)
End Sub
End Class
Aşağıdaki kod örneği, bir ASP.NET sayfasında ve Employee
sınıflarının nasıl kullanılacağını CollectionPropertyControl
gösterir.
<%@ Page Language="C#" Debug="true" %>
<%@ Register TagPrefix="AspSample" Assembly="Samples.AspNet.CS.Controls" Namespace="Samples.AspNet.CS.Controls" %>
<!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)
{
// Verify attribute values.
ParseChildrenAttribute p =
(ParseChildrenAttribute)Attribute.GetCustomAttribute(typeof(CollectionPropertyControl),
typeof(ParseChildrenAttribute));
StringBuilder sb = new StringBuilder();
sb.Append("The DefaultProperty property is " + p.DefaultProperty.ToString() + "<br />");
sb.Append("The ChildrenAsProperties property is " + p.ChildrenAsProperties.ToString() + "<br />");
sb.Append("The IsDefaultAttribute method returns " + p.IsDefaultAttribute().ToString());
Message.Text = sb.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ParseChildrenAttribute Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Message"
runat="server"/>
<AspSample:CollectionPropertyControl id="CollectionPropertyControl1"
runat="server">
<AspSample:Employee Name="Employee 1"
Title="Title 1"
Alias="Alias 1" />
<AspSample:Employee Name="Employee 2"
Title="Title 2"
Alias="Alias 2" />
</AspSample:CollectionPropertyControl>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Register TagPrefix="AspSample" Assembly="Samples.AspNet.VB.Controls" Namespace="Samples.AspNet.VB.Controls" %>
<!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)
' Verify attribute values.
Dim p As ParseChildrenAttribute = _
Attribute.GetCustomAttribute(GetType(CollectionPropertyControl), _
GetType(ParseChildrenAttribute))
Dim sb As New StringBuilder()
sb.Append("The DefaultProperty property is " & p.DefaultProperty.ToString() & "<br />")
sb.Append("The ChildrenAsProperties property is " & p.ChildrenAsProperties.ToString() & "<br />")
sb.Append("The IsDefaultAttribute method returns " & p.IsDefaultAttribute().ToString())
Message.Text = sb.ToString()
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<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:Employee Name="Employee 1"
Title="Title 1"
Alias="Alias 1" />
<AspSample:Employee Name="Employee 2"
Title="Title 2"
Alias="Alias 2" />
</AspSample:CollectionPropertyControl>
</div>
</form>
</body>
</html>
Açıklamalar
ise childrenAsProperties
false
, öğeler denetim olarak ayrıştırılır.