创建一个服务器端控件，该控件映射到 <input type=file> HTML 元素并允许您将文件上载到服务器。
<input
Type="File"
EnableViewState="False|True"
Id="string"
Visible="False|True"
OnDataBinding="OnDataBinding event handler"
OnDisposed="OnDisposed event handler"
OnInit="OnInit event handler"
OnLoad="OnLoad event handler"
OnPreRender="OnPreRender event handler"
OnUnload="OnUnload event handler"
runat="server"
/> |
备注
使用
示例
下面的示例说明一个简单的文件上载方案。第一部分代码定义该页的事件处理程序。当用户单击窗体上的 Upload 按钮时，将在该页上显示文件名、内容长度和内容数量（以字节为单位），而文件本身则被上载到服务器上的 UploadedFiles 目录。
 注意 |
|---|
|
必须将窗体的 enctype 属性设置为“multipart/form-data”。 |
窗体的代码实现了一个
| 注意 |
|---|
|
若要查看有关该页上的上载文件的信息，必须在事件处理程序代码中将 Visible 属性（ |
| Visual Basic? |  复制代码 |
|---|---|
<%@ Page Language="VB" AutoEventWireup="True" %>
<html>
<head>
<title>HtmlInputFile Control</title>
</head>
<script runat="server">
Sub UploadBtn_Click(Sender as Object, e as EventArgs)
' Display information about posted file
FileName.InnerHtml = MyFile.PostedFile.FileName
MyContentType.InnerHtml = MyFile.PostedFile.ContentType
ContentLength.InnerHtml = cStr(MyFile.PostedFile.ContentLength)
FileDetails.Visible = True
' Save uploaded file to server
MyFile.PostedFile.SaveAs("c:\Uploadedfiles\uploadfile.txt")
End Sub
</script>
<body>
<form id="Form1" action="fileupload.aspx"
method="post"
enctype="multipart/form-data"
runat="server">
<h1>ASP.NET File Upload Example</h1>
Select File To Upload to Server:
<input id="MyFile"
type="file"
runat="server">
<br><br>
<input id="Submit1" type=submit
value="Upload!"
OnServerclick="UploadBtn_Click"
runat="server">
<br><br><br>
<div id="FileDetails"
Visible=false
runat="server">
FileName: <span id="FileName" runat="server"/> <br>
ContentType: <span id="MyContentType" runat="server"/> <br>
ContentLength: <span id="ContentLength" runat="server"/>bytes
<br>
</div>
</form>
</body>
</html>
| |
| C#? | 复制代码 |
|---|---|
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<head>
<title>HtmlInputFile Control</title>
</head>
<script runat="server">
void UploadBtn_Click(Object sender, EventArgs e)
{
// Display information about posted file
FileName.InnerHtml = MyFile.PostedFile.FileName;
MyContentType.InnerHtml = MyFile.PostedFile.ContentType;
ContentLength.InnerHtml =
MyFile.PostedFile.ContentLength.ToString();
FileDetails.Visible = true;
// Save uploaded file to server
MyFile.PostedFile.SaveAs("c:\\Uploadedfiles\\uploadfile.txt");
}
</script>
<body>
<form id="Form1" action="fileupload.aspx"
method="post"
enctype="multipart/form-data"
runat="server">
<h1>ASP.NET File Upload Example</h1>
Select File To Upload to Server:
<input id="MyFile"
type="file"
runat="server">
<br><br>
<input id="Submit1" type=submit
value="Upload!"
OnServerclick="UploadBtn_Click"
runat="server">
<br><br><br>
<div id="FileDetails"
Visible=false
runat="server">
FileName: <span id="FileName" runat="server"/> <br>
ContentType: <span id="MyContentType" runat="server"/> <br>
ContentLength: <span id="ContentLength" runat="server"/>bytes
<br>
</div>
</form>
</body>
</html>
| |
请参见
