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HtmlTextArea.Name Proprietà

Definizione

Ottiene o imposta un identificatore univoco per il controllo 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, set
Public Overridable Property Name As String

Valore della proprietà

String

Stringa che rappresenta il valore della proprietà UniqueID.

Esempio

Nell'esempio di codice seguente viene illustrato come utilizzare la Name proprietà per selezionare un HtmlTextArea controllo in una pagina e impostarne la Value proprietà.

<%@ 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>

Commenti

Utilizzare la Name proprietà per determinare il nome dell'identificatore univoco per il HtmlTextArea controllo. In questa implementazione della proprietà la get funzione di accesso restituisce il valore della Control.UniqueID proprietà . Tuttavia, la set funzione di accesso non assegna un valore a questa proprietà.

Nota

La set funzione di accesso non assegna un valore a questa proprietà perché la Name proprietà deve avere lo stesso valore della Control.UniqueID proprietà per il corretto funzionamento del HtmlTextArea controllo.

Le classi che ereditano dalla classe possono eseguire l'override di HtmlTextArea questa implementazione, se necessario.

Si applica a

Vedi anche