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Image Web Server Control Declarative Syntax 

  • Artigo

Displays a Web-compatible image on the Web Forms page.

<asp:Image
    AccessKey="string"
    AlternateText="string"
    BackColor="color name|#dddddd"
    BorderColor="color name|#dddddd"
    BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|
        Inset|Outset"
    BorderWidth="size"
    CssClass="string"
    DescriptionUrl="uri"
    Enabled="True|False"
    EnableTheming="True|False"
    EnableViewState="True|False"
    ForeColor="color name|#dddddd"
    GenerateEmptyAlternateText="True|False"
    Height="size"
    ID="string"
    ImageAlign="NotSet|Left|Right|Baseline|Top|Middle|Bottom|
        AbsBottom|AbsMiddle|TextTop"
    ImageUrl="uri"
    OnDataBinding="DataBinding event handler"
    OnDisposed="Disposed event handler"
    OnInit="Init event handler"
    OnLoad="Load event handler"
    OnPreRender="PreRender event handler"
    OnUnload="Unload event handler"
    runat="server"
    SkinID="string"
    Style="string"
    TabIndex="integer"
    ToolTip="string"
    Visible="True|False"
    Width="size"
/>

Remarks

Use the Image control to display an image on the Web Forms page. Setting the ImageUrl property specifies the path to the displayed image. You can specify the text to display in place of the image when the image is not available by setting the AlternateText property. The ImageAlign property specifies the alignment of the image in relation to other elements on the Web Forms page.

NoteNote

This control only displays an image. If you want the image to behave like a button or need to determine the coordinates where the mouse pointer is clicked on the image, use the ImageButton control.
NoteNote

Because the <asp:Image> element has no content, you can close the tag with /> instead of using a separate closing tag.

For detailed information on the Image Web server control's properties and events, see the Image documentation.

Example

The following example demonstrates how to create an Image control on a Web page.

NoteNote

The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model.

 
<%@ Page Language="VB" %>
<!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>Image Example</title>
<script language="VB" runat="server">

      Sub Button_Click(sender As Object, e As EventArgs)
         Select Case DropList1.SelectedIndex
            Case 0:
               Image1.ImageAlign = ImageAlign.NotSet
         
            Case 1:
               Image1.ImageAlign = ImageAlign.Left

            Case 2:
               Image1.ImageAlign = ImageAlign.Right

            Case 3:
               Image1.ImageAlign = ImageAlign.Baseline

            Case 4:
               Image1.ImageAlign = ImageAlign.Top

            Case 5:
               Image1.ImageAlign = ImageAlign.Middle

            Case 6:
               Image1.ImageAlign = ImageAlign.Bottom
         
            Case 7:
               Image1.ImageAlign = ImageAlign.AbsBottom

            Case 8:
               Image1.ImageAlign = ImageAlign.AbsMiddle

            Case 9:
               Image1.ImageAlign = ImageAlign.TextTop

            Case Else:
               Image1.ImageAlign = ImageAlign.NotSet

         End Select
      End Sub

   </script>

</head>
 
<body>

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

      <h3>Image Example</h3>

      <div style="font-size:large">

         Text Text Text Text Text Text Text Text Text Text Text Text 
         Text Text Text Text Text Text Text Text Text Text Text Text 
         Text Text Text Text Text Text Text Text Text Text Text Text

      </div> 
 
      <asp:Image id="Image1" runat="server"
           AlternateText="Image text"
           ImageAlign="left"
           ImageUrl="images/image1.jpg"/>

      <hr />
    
      Select Image Align: <br />

      <asp:DropDownList id="DropList1"
           runat="server">

         <asp:ListItem>NotSet</asp:ListItem>
         <asp:ListItem>Left</asp:ListItem>
         <asp:ListItem>Right</asp:ListItem>
         <asp:ListItem>BaseLine</asp:ListItem>
         <asp:ListItem>Top</asp:ListItem>
         <asp:ListItem>Middle</asp:ListItem>
         <asp:ListItem>Bottom</asp:ListItem>
         <asp:ListItem>AbsBottom</asp:ListItem>
         <asp:ListItem>AbsMiddle</asp:ListItem>
         <asp:ListItem>TextTop</asp:ListItem>     

      </asp:DropDownList>

      <br /><br />

      <asp:Button id="Button1"
           Text="Apply Image Alignment"
           OnClick="Button_Click" 
           runat="server"/>
  
   </form>

</body>
</html>
   

<%@ Page Language="C#" %>
<!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>Image Example</title>
<script language="C#" runat="server">

      void Button_Click(Object sender, EventArgs e)
      {
         switch(DropList1.SelectedIndex)
         {
            case 0:
               Image1.ImageAlign = ImageAlign.NotSet;
               break;
         
            case 1:
               Image1.ImageAlign = ImageAlign.Left;
               break;

            case 2:
               Image1.ImageAlign = ImageAlign.Right;
               break;

            case 3:
               Image1.ImageAlign = ImageAlign.Baseline;
               break;

            case 4:
               Image1.ImageAlign = ImageAlign.Top;
               break;

            case 5:
               Image1.ImageAlign = ImageAlign.Middle;
               break;

            case 6:
               Image1.ImageAlign = ImageAlign.Bottom;
               break;
         
            case 7:
               Image1.ImageAlign = ImageAlign.AbsBottom;
               break;

            case 8:
               Image1.ImageAlign = ImageAlign.AbsMiddle;
               break;

            case 9:
               Image1.ImageAlign = ImageAlign.TextTop;
               break;

            default:
               Image1.ImageAlign = ImageAlign.NotSet;
               break;

         }

      }

   </script>

</head>
 
<body>

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

      <h3>Image Example</h3>

      <div style="font-size:large">

         Text Text Text Text Text Text Text Text Text Text Text Text 
         Text Text Text Text Text Text Text Text Text Text Text Text 
         Text Text Text Text Text Text Text Text Text Text Text Text

      </div> 
 
      <asp:Image id="Image1" runat="server"
           AlternateText="Image text"
           ImageAlign="left"
           ImageUrl="images/image1.jpg"/>

      <hr />
    
      Select Image Align: <br />

      <asp:DropDownList id="DropList1"
           runat="server">

         <asp:ListItem>NotSet</asp:ListItem>
         <asp:ListItem>Left</asp:ListItem>
         <asp:ListItem>Right</asp:ListItem>
         <asp:ListItem>BaseLine</asp:ListItem>
         <asp:ListItem>Top</asp:ListItem>
         <asp:ListItem>Middle</asp:ListItem>
         <asp:ListItem>Bottom</asp:ListItem>
         <asp:ListItem>AbsBottom</asp:ListItem>
         <asp:ListItem>AbsMiddle</asp:ListItem>
         <asp:ListItem>TextTop</asp:ListItem>     

      </asp:DropDownList>

      <br /><br />

      <asp:Button id="Button1"
           Text="Apply Image Alignment"
           OnClick="Button_Click" 
           runat="server"/>
  
   </form>

</body>
</html>
   

<%@ Page Language="JSCRIPT" %>
<!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>Image Example</title>
<script language="JSCRIPT" runat="server">

      function Button_Click(sender : Object, e : EventArgs){
         switch(DropList1.SelectedIndex){
            case 0:
               Image1.ImageAlign = ImageAlign.NotSet
               break
            case 1:
               Image1.ImageAlign = ImageAlign.Left
               break
            case 2:
               Image1.ImageAlign = ImageAlign.Right
               break
            case 3:
               Image1.ImageAlign = ImageAlign.Baseline
               break
            case 4:
               Image1.ImageAlign = ImageAlign.Top
               break
            case 5:
               Image1.ImageAlign = ImageAlign.Middle
               break
            case 6:
               Image1.ImageAlign = ImageAlign.Bottom
               break
            case 7:
               Image1.ImageAlign = ImageAlign.AbsBottom
               break
            case 8:
               Image1.ImageAlign = ImageAlign.AbsMiddle
               break
            case 9:
               Image1.ImageAlign = ImageAlign.TextTop
               break
            default:
               Image1.ImageAlign = ImageAlign.NotSet
               break
         }
      }

   </script>

</head>
 
<body>

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

      <h3>Image Example</h3>

      <div style="font-size:large">

         Text Text Text Text Text Text Text Text Text Text Text Text 
         Text Text Text Text Text Text Text Text Text Text Text Text 
         Text Text Text Text Text Text Text Text Text Text Text Text

      </div> 
 
      <asp:Image id="Image1" runat="server"
           AlternateText="Image text"
           ImageAlign="left"
           ImageUrl="images/image1.jpg"/>

      <hr />
    
      Select Image Align: <br />

      <asp:DropDownList id="DropList1"
           runat="server">

         <asp:ListItem>NotSet</asp:ListItem>
         <asp:ListItem>Left</asp:ListItem>
         <asp:ListItem>Right</asp:ListItem>
         <asp:ListItem>BaseLine</asp:ListItem>
         <asp:ListItem>Top</asp:ListItem>
         <asp:ListItem>Middle</asp:ListItem>
         <asp:ListItem>Bottom</asp:ListItem>
         <asp:ListItem>AbsBottom</asp:ListItem>
         <asp:ListItem>AbsMiddle</asp:ListItem>
         <asp:ListItem>TextTop</asp:ListItem>     

      </asp:DropDownList>

      <br /><br />

      <asp:Button id="Button1"
           Text="Apply Image Alignment"
           OnClick="Button_Click" 
           runat="server"/>
  
   </form>

</body>
</html>

See Also

Reference

Image

Other Resources

Web Server Control Syntax