PersistChildrenAttribute.UsesCustomPersistence 属性
定义
重要
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获取一个值，该值指示在设计时服务器控件是否提供嵌套控件的自定义保留。
public:
property bool UsesCustomPersistence { bool get(); };public bool UsesCustomPersistence { get; }member this.UsesCustomPersistence : boolPublic ReadOnly Property UsesCustomPersistence As Boolean属性值
true 表示提供嵌套内容的自定义持久性；否则为 false。 默认值为 false。
示例
下面的代码示例演示如何获取属性的值 UsesCustomPersistence 。
此代码示例是为类提供的大型示例的 PersistChildrenAttribute 一部分。
<%@ 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 xmlns="http://www.w3.org/1999/xhtml" >
<head 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="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 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:CollectionPropertyControl>
</div>
</form>
</body>
</html>
注解
若要为自定义持久性配置嵌套内容，请使用 PersistChildrenAttribute 采用参数 usesCustomPersistence 的重载。