HtmlTextArea.Name Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene o establece un nombre de identificador único para el control HtmlTextArea.
public:
virtual property System::String ^ Name { System::String ^ get(); void set(System::String ^ value); };public virtual string Name { get; set; }member this.Name : string with get, setPublic Overridable Property Name As StringValor de propiedad
Cadena que representa el valor de la propiedad UniqueID.
Ejemplos
En el ejemplo de código siguiente se muestra cómo usar la Name propiedad para seleccionar un HtmlTextArea control en una página y establecer su Value propiedad.
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server" >
void Page_Load(Object sender, EventArgs e)
{
// Bind a data source to the Repeater control.
Repeater1.DataSource = CreateRepeaterSource();
Repeater1.DataBind();
}
void Item_Bound(Object sender, RepeaterItemEventArgs e)
{
// The ItemDataBound event is raised when data is bound to an
// item in the Repeater control. Items can include the Header,
// Footer, and so on. Use the following logic only if the item
// being bound is an Item or AlternatingItem.
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
// The runtime automatically generates a unique identifier
// for each control embedded in a list control, such as the
// Repeater control. The Name property of the HtmlTextArea
// control contains this unique identifier and is commonly used to
// identify a specific control.
// Retrieve the HtmlTextArea control from the RepeaterItem.
HtmlTextArea area = (HtmlTextArea)e.Item.FindControl("TextArea1");
// Insert a custom message for the fourth HtmlTextArea control by
// looking for a Name property that contains the number 3.
if (area.Name.Contains("3"))
{
area.Value = "Hello World";
}
}
}
DataView CreateRepeaterSource()
{
// Create a DataTable that contains sample data for the
// Repeater control.
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("Category", typeof(String)));
// Populate the DataTable with sample values.
for (int i = 0; i < 5; i++)
{
dr = dt.NewRow();
dr[0] = "Category " + i.ToString();
dt.Rows.Add(dr);
}
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
return dv;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlTextArea Name Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlTextArea Name Example</h3>
Notice that Category 3 has custom text. <br />
<asp:Repeater id="Repeater1"
onitemdatabound="Item_Bound"
runat="server">
<ItemTemplate>
<h4><%# DataBinder.Eval(Container.DataItem, "Category") %></h4>
Enter text:
<br />
<textarea rows="2" cols="20" id="TextArea1"
runat="server"/>
<br /><br />
<hr />
</ItemTemplate>
</asp:Repeater>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server" >
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Bind a data source to the Repeater control.
Repeater1.DataSource = CreateRepeaterSource()
Repeater1.DataBind()
End Sub
Sub Item_Bound(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)
' The ItemDataBound event is raised when data is bound to an
' item in the Repeater control. Items can include the Header,
' Footer, and so on. Use the following logic only if the item
' being bound is an Item or AlternatingItem.
If (e.Item.ItemType = ListItemType.Item) Or _
(e.Item.ItemType = ListItemType.AlternatingItem) Then
' The runtime automatically generates a unique identifier
' for each control embedded in a list control, such as the
' Repeater control. The Name property of the HtmlTextArea
' control contains this unique identifier and is commonly used to
' identify a specific control.
' Retrieve the HtmlTextArea control from the RepeaterItem.
Dim area As HtmlTextArea = _
CType(e.Item.FindControl("TextArea1"), HtmlTextArea)
' Insert a custom message for the fourth HtmlTextArea control by
' looking for a Name property that contains the number 3.
If area.Name.Contains("3") Then
area.Value = "Hello World"
End If
End If
End Sub
Function CreateRepeaterSource() As DataView
' Create a DataTable that contains sample data for the
' Repeater control.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("Category", GetType(String)))
' Populate the DataTable with sample values.
Dim i As Integer
For i = 0 To 4
dr = dt.NewRow()
dr(0) = "Category " & i.ToString()
dt.Rows.Add(dr)
Next i
' Create a DataView from the DataTable.
Dim dv As DataView = New DataView(dt)
Return dv
End Function
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlTextArea Name Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlTextArea Name Example</h3>
Notice that Category 3 has custom text. <br />
<asp:Repeater id="Repeater1"
onitemdatabound="Item_Bound"
runat="server">
<ItemTemplate>
<h4><%# DataBinder.Eval(Container.DataItem, "Category") %></h4>
Enter text:
<br />
<textarea rows="2" cols="20" id="TextArea1"
runat="server"/>
<br /><br />
<hr />
</ItemTemplate>
</asp:Repeater>
</form>
</body>
</html>
Comentarios
Use la Name propiedad para determinar el nombre de identificador único del HtmlTextArea control. En esta implementación de la propiedad , el get descriptor de acceso devuelve el valor de la Control.UniqueID propiedad . Sin embargo, el set descriptor de acceso no asigna un valor a esta propiedad.
Nota
El set descriptor de acceso no asigna un valor a esta propiedad porque la Name propiedad debe tener el mismo valor que la Control.UniqueID propiedad para que el HtmlTextArea control funcione correctamente.
Las clases que heredan de la HtmlTextArea clase pueden invalidar esta implementación, si es necesario.