HtmlInputFile Konstruktor

Definition

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

Initialisiert eine neue Instanz der HtmlInputFile-Klasse.

public:
 HtmlInputFile();
public HtmlInputFile();
Public Sub New ()

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie eine neue Instanz der HtmlInputFile Klasse erstellt wird. Damit dieses Beispiel ordnungsgemäß funktioniert, müssen Sie ein Verzeichnis erstellen, das auf dem Laufwerk C Ihres Computers aufgerufen wird Temp .

<%@ 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">
<script runat="server">
  
  void Button1_Click(object sender, EventArgs e)
  {

    // Get the HtmlInputFile control from the Controls collection 
    // of the PlaceHolder control.
    HtmlInputFile file = (HtmlInputFile)Place.FindControl("File1");

    // Make sure a file was submitted.
    if (Text1.Value == "")
    {
      Span1.InnerHtml = "Error: You must enter a file name.";
      return;
    }

    // Save the file.
    if (file.PostedFile.ContentLength > 0)
    {
      try
      {
        
        file.PostedFile.SaveAs("c:\\temp\\" + Text1.Value);
        Span1.InnerHtml = "File uploaded successfully to " +
           "<b>c:\\temp\\" + Text1.Value + "</b> on the Web server.";
        
      }
      catch (Exception exc)
      {
        
        Span1.InnerHtml = "Error saving file <b>c:\\temp\\" +
           Text1.Value + "</b><br />" + exc.ToString() + ".";
        
      }
    }
  }

  void Page_Load(object sender, EventArgs e)
  {

    // Create a new HtmlInputFile control.
    HtmlInputFile file = new HtmlInputFile();
    file.ID = "File1";

    // Add the control to the Controls collection of the
    // PlaceHolder control.
    Place.Controls.Clear();
    Place.Controls.Add(file);

  }
 
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>HtmlInputFile Constructor Example</title>
  </head>

  <body>
 
   <h3>HtmlInputFile Constructor Example</h3>
 
   <form id="form1" enctype="multipart/form-data" 
         runat="server">
 
      Specify the file to upload:
      <asp:PlaceHolder id="Place" 
                       runat="server"/> 
 
      <p>
      Save as file name (no path): 
      <input id="Text1" 
             type="text" 
             runat="server" />
 
      </p>
      <p>
      <span id="Span1" 
            style="font: 8pt verdana;" 
            runat="server" />

      </p>
      <p>
      <input type="button" 
             id="Button1" 
             value="Upload" 
             onserverclick="Button1_Click" 
             runat="server" />
 
      </p>

   </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">
<script runat="server">
 
  Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)

    ' Get HtmlInputFile control from the Controls collection
    ' of the PlaceHolder control.
    Dim file As HtmlInputFile = _
       CType(Place.FindControl("File1"), HtmlInputFile)
 
    ' Make sure a file was submitted.
    If Text1.Value = "" Then
         
      Span1.InnerHtml = "Error: You must enter a file name."
      Return
          
    End If
 
    ' Save the file.
    If file.PostedFile.ContentLength > 0 Then

      Try
        
        file.PostedFile.SaveAs(("c:\temp\" & Text1.Value))
        Span1.InnerHtml = "File uploaded successfully to " & _
           "<b>c:\temp\" & Text1.Value & "</b> on the Web server."
        
      Catch exc As Exception
        
        Span1.InnerHtml = "Error saving file <b>c:\temp\" & _
           Text1.Value & "</b><br />" & exc.ToString() & "."
        
      End Try

    End If

  End Sub


  Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' Create a new HtmlInputFile control.
    Dim file As HtmlInputFile = New HtmlInputFile()
    file.ID = "File1"

    ' Add the control to the Controls collection of the
    ' PlaceHolder control.
    Place.Controls.Clear()
    Place.Controls.Add(file)

  End Sub
 
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>HtmlInputFile Constructor Example</title>
  </head>

<body>
 
   <h3>HtmlInputFile Constructor Example</h3>
 
   <form id="form1" enctype="multipart/form-data" 
         runat="server">
 
      Specify the file to upload:
      <asp:PlaceHolder id="Place"
                       runat="server"/> 
 
      <p>
      Save as file name (no path): 
      <input id="Text1" 
             type="text" 
             runat="server" />
 
      </p>
      <p>
      <span id="Span1" 
            style="font: 8pt verdana;" 
            runat="server" />

      </p>
      <p>
      <input type="button" 
             id="Button1" 
             value="Upload" 
             onserverclick="Button1_Click" 
             runat="server" />
 
      </p>
   </form>
 
</body>
</html>

Hinweise

Verwenden Sie diesen Konstruktor, um eine neue Instanz der HtmlInputFile Klasse zu erstellen und zu initialisieren.

Die folgende Tabelle zeigt den anfänglichen Eigenschaftswert für eine Instanz von HtmlInputFile.

Eigentum Anfangswert
Type Die Literalzeichenfolge "file".

Gilt für: