HiddenField.Value Property

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the value of the hidden field.

public:
 virtual property System::String ^ Value { System::String ^ get(); void set(System::String ^ value); };

[System.ComponentModel.Bindable(true)]
public virtual string Value { get; set; }

[<System.ComponentModel.Bindable(true)>]
member this.Value : string with get, set

Public Overridable Property Value As String

Property Value

String

The value of the hidden field. The default is an empty string ("").

Attributes: BindableAttribute

Examples

The following example demonstrates how to use the Value property to specify the value of the HiddenField control.

Важливо

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

ASP.NET (C#)


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
 
  void ValueHiddenField_ValueChanged (Object sender, EventArgs e)
  {
    
    // Display the value of the HiddenField control.
    Message.Text = "The value of the HiddenField control is " + ValueHiddenField.Value + ".";
    
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
    <title>HiddenField Example</title>
</head>
<body>
        <form id="Form1" runat="server">
        
            <h3>HiddenField Example</h3>

            Please enter a value and click the submit button.<br/>
            
            <asp:Textbox id="ValueTextBox"
              runat="server"/>
              
            <br/>  
              
            <input type="submit" name="SubmitButton"
             value="Submit"
             onclick="PageLoad()" />
             
            <br/>
            
            <asp:label id="Message" runat="server"/>    
            
            <asp:hiddenfield id="ValueHiddenField"
              onvaluechanged="ValueHiddenField_ValueChanged"
              value="" 
              runat="server"/>
            
        </form>
    </body>
</html>

<script type="text/javascript">

  <!--
  function PageLoad()
  {
  
    // Set the value of the HiddenField control with the
    // value from the TextBox.
    Form1.ValueHiddenField.value = Form1.ValueTextBox.value;
    
  }
  -->
  
</script>


<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
 
  Sub ValueHiddenField_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
    
    ' Display the value of the HiddenField control.
    Message.Text = "The value of the HiddenField control is " & ValueHiddenField.Value & "."
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
    <title>HiddenField Example</title>
</head>
<body>
        <form id="Form1" runat="server">
        
            <h3>HiddenField Example</h3>

            Please enter a value and click the submit button.<br/>
            
            <asp:textbox id="ValueTextBox"
              runat="server"/>
              
            <br/>  
              
            <input type="submit" name="SubmitButton"
             value="Submit"
             onclick="PageLoad()" />
             
            <br/>
            
            <asp:label id="Message" runat="server"/>    
            
            <asp:hiddenfield id="ValueHiddenField"
              onvaluechanged="ValueHiddenField_ValueChanged"
              value="" 
              runat="server"/>
            
        </form>
    </body>
</html>

<script type="text/javascript">

  <!--
  function PageLoad()
  {
  
    // Set the value of the HiddenField control with the
    // value from the TextBox.
    Form1.ValueHiddenField.value = Form1.ValueTextBox.value;
    
  }
  -->
  
</script>

Remarks

Use the Value property to specify or determine the value of the HiddenField control.

Applies to

Продукт	Версії
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

Поділитися через