简介
FileUpload 服务器控件示例
小结
自引入 Microsoft ASP.NET 版本 1.0 之日起，就存在生成 Web 应用程序的内置方法，这些方法能够将文件上载到宿主服务器。这是通过使用 File Field HTML 服务器控件实现的。我以前写过一篇关于如何在 ASP.NET 应用程序中有效使用该控件的 MSDN 文章。本文将再次介绍文件上载过程，但不是使用 File Field 控件，我将向您介绍如何有效使用 ASP.NET 2.0 提供的新 FileUpload 服务器控件。
FileUpload 服务器控件示例
在 ASP.NET 1.x 中使用 File Field 控件时，必须采取一些额外的步骤才能使一切有条不紊地正常运行。例如，您需要亲自将 enctype="multipart/form-data" 添加到页面的 <form> 元素中。ASP.NET 2.0 中提供的新 FileUpload 服务器控件使将文件上载到宿主服务器的过程尽可能的简单。
<script runat="server">
Protected Sub Button1_Click(ByVal sender As Object, _
ByVal e As System.EventArgs)
If FileUpload1.HasFile Then
Try
FileUpload1.SaveAs("C:\Uploads\" & _
FileUpload1.FileName)
Label1.Text = "File name: " & _
FileUpload1.PostedFile.FileName & "<br>" & _
"File Size: " & _
FileUpload1.PostedFile.ContentLength & " kb<br>" & _
"Content type: " & _
FileUpload1.PostedFile.ContentType
Catch ex As Exception
Label1.Text = "ERROR: " & ex.Message.ToString()
End Try
Else
Label1.Text = "You have not specified a file."
End If
End Sub
</script>
<head runat="server">
<title>Upload Files</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<ASP:FileUpload ID="FileUpload1" runat="server" /><br />
<br />
<ASP:Button ID="Button1" runat="server" OnClick="Button1_Click"
Text="Upload File" /> <br />
<br />
<ASP:Label ID="Label1" runat="server"></ASP:Label></div>
</form>
</body>
</HTML>
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
try
{
FileUpload1.SaveAs("C:\\Uploads\\" +
FileUpload1.FileName);
Label1.Text = "File name: " +
FileUpload1.PostedFile.FileName + "<br>" +
FileUpload1.PostedFile.ContentLength + " kb<br>" +
"Content type: " +
FileUpload1.PostedFile.ContentType;
}
catch (Exception ex)
{
Label1.Text = "ERROR: " + ex.Message.ToString();
}
else
{
Label1.Text = "You have not specified a file.";
}
}
</script>
<head runat="server">
<title>Upload Files</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<ASP:FileUpload ID="FileUpload1" runat="server" /><br />
<br />
<ASP:Button ID="Button1" runat="server" OnClick="Button1_Click"
Text="Upload File" /> <br />
<br />
<ASP:Label ID="Label1" runat="server"></ASP:Label></div>
</form>
</body>
</HTML>
<head><title>
Upload Files
</title></head>
<body>
<form name="form1" method="post" action="MyFileUpload.ASPx"
id="form1" enctype="multipart/form-data">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNDcxNTg5NDg3D2QWAgIEDxYCHgdlbmN0eXBlBRNtdWx0aXBhcnQvZm9yb
S1kYXRhZGQUQEUFMY1+/fp1mnrkbqmVNQIzFA==" />
</div>
<input type="file" name="FileUpload1" id="FileUpload1" /><br />
<br />
<input type="submit" name="Button1" value="Upload File"
id="Button1" /> <br />
<br />
<span id="Label1"></span>
</div>
<div>
value="/wEWAgLB+7jIAwKM54rGBv2Iz6LxVY7jWec0gZMxnuaK2ufq" />
</div></form>
</body>
</HTML>