Editare

Partajați prin

ListBox.Rows Property

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Gets or sets the number of rows displayed in the ListBox control.

public:
 virtual property int Rows { int get(); void set(int value); };
[System.ComponentModel.Bindable(true)]
public virtual int Rows { get; set; }
public virtual int Rows { get; set; }
[<System.ComponentModel.Bindable(true)>]
member this.Rows : int with get, set
member this.Rows : int with get, set
Public Overridable Property Rows As Integer

Property Value

Int32

The number of rows displayed in the ListBox control. The default value is 4.

Attributes
BindableAttribute

Exceptions

ArgumentOutOfRangeException

The specified number of rows is less than one or greater than 2000.

Examples

The following example demonstrates how to use the Rows property to display six rows in the ListBox control.

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>ListBox Example</title>
<script language="C#" runat="server">

      void SubmitBtn_Click(Object sender, EventArgs e) 
      {
         if (ListBox1.SelectedIndex > -1)
            Label1.Text="You chose: " + ListBox1.SelectedItem.Text;
      }

   </script>

</head>
<body>

   <h3>ListBox Example</h3>

   <form id="form1" runat="server">

      <asp:ListBox id="ListBox1" 
           Rows="6"
           Width="100px"
           SelectionMode="Single" 
           runat="server">

         <asp:ListItem>Item 1</asp:ListItem>
         <asp:ListItem>Item 2</asp:ListItem>
         <asp:ListItem>Item 3</asp:ListItem>
         <asp:ListItem>Item 4</asp:ListItem>
         <asp:ListItem>Item 5</asp:ListItem>
         <asp:ListItem>Item 6</asp:ListItem>

      </asp:ListBox>

      <asp:button id="Button1"
           Text="Submit" 
           OnClick="SubmitBtn_Click" 
           runat="server" />
        
      <asp:Label id="Label1" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"/>
        
   </form>

</body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>ListBox Example</title>
<script language="VB" runat="server">

      Sub SubmitBtn_Click(sender As Object, e As EventArgs) 
         If ListBox1.SelectedIndex > -1 Then
            Label1.Text = "You chose: " & ListBox1.SelectedItem.Text
         End If
      End Sub

   </script>

</head>
<body>

   <h3>ListBox Example</h3>

   <form id="form1" runat="server">

      <asp:ListBox id="ListBox1" 
           Rows="6"
           Width="100px"
           SelectionMode="Single" 
           runat="server">

         <asp:ListItem>Item 1</asp:ListItem>
         <asp:ListItem>Item 2</asp:ListItem>
         <asp:ListItem>Item 3</asp:ListItem>
         <asp:ListItem>Item 4</asp:ListItem>
         <asp:ListItem>Item 5</asp:ListItem>
         <asp:ListItem>Item 6</asp:ListItem>

      </asp:ListBox>

      <asp:button id="Button1"
           Text="Submit" 
           OnClick="SubmitBtn_Click" 
           runat="server" />
        
      <asp:Label id="Label1" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"/>
        
   </form>

</body>
</html>

Remarks

Use the Rows property to specify the number of rows to display in the ListBox control.

Caution

The number of rows must be between one and 2000. Values outside of this range will raise an exception.

The value of the Rows property is stored in view state.

Applies to

See also