HTML Controls->ASP.NET HtmlInputFile Control

Definition and Usage

The HtmlInputFile control is used to control an <input type="file"> element. In HTML, this element is used to upload a file to the server.

Properties

Property Description
Accept List of acceptable MIME types
Attributes Returns all attribute name and value pairs of the element
Disabled A Boolean value that indicates whether or not the control should be disabled. Default is false
id A unique id for the element
MaxLength The maximum number of characters allowed in this element
Name The name of the element
PostedFile Gets access to the posted file
runat Specifies that the element is a server control.  Must be set to "server"
Size The width of the element
Style Sets or returns the CSS properties that are applied to the control
TagName Returns the element tag name
Type The type of the element
Value The value of the element
Visible A Boolean value that indicates whether or not the control should be visible

Example 1

In the following example we declare one HtmlInputFile control, one HtmlInputButton control, and three HtmlGeneric controls in an .aspx file (remember to embed the controls inside an HtmlForm control). When the submit button is triggered, the submit subroutine is executed. The file name and file type are displayed on the page, while the file itself is uploaded to the c directory on the server:

<script runat="server">
            Sub submit(Sender as Object, e as EventArgs)
            fname.InnerHtml=MyFile.PostedFile.FileName
            clength.InnerHtml=MyFile.PostedFile.ContentLength
            MyFile.PostedFile.SaveAs("c:\uploadfile.txt")
            End Sub
            </script>
<html>
            <body>
<form method="post"
            enctype="multipart/form-data" runat="server">
            <p>
            Select file to upload to server:
            <input id="MyFile" type="file" size="40" runat="server">
            </p>
            <p>
            <input type="submit" value="Upload!" OnServerclick="submit"
            runat="server">
            </p>
            <p>
            <div runat="server">
            FileName: <span id="fname" runat="server"/><br />
            ContentLength: <span id="clength" runat="server"/> bytes
            </div>
            </p>
            </form>
</body>
            </html>

posted on 2007-03-26 15:17  改变热爱  阅读(225)  评论(0)    收藏  举报

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