form表单上传文件

 
表单中enctype="multipart/form-data"的意思，是设置表单的MIME编码。
 
 
默认情况，enctype的编码格式是application/x-www-form-urlencoded，不能用于文件上传；
 
 
只有使用了multipart/form-data，才能完整的传递文件数据，进行下面的操作.
 
 

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利用表单上传文件的例子：

<form id="form1" runat="server" enctype="multipart/form-data" >
<wbr><wbr><wbr> &lt;div&gt;<br><wbr><wbr><wbr> &lt;a id="addAttach" href="#"&gt;添加上传文件&lt;/a&gt;<br><wbr><wbr><wbr> &lt;div id="files"&gt;</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><wbr> &lt;input type="file" name="f1"/&gt;</wbr></wbr></wbr>

<wbr><wbr><wbr> &lt;input type="file" name="f2"/&gt;</wbr></wbr></wbr>

<wbr><wbr><wbr> &lt;/div&gt;<br><wbr><wbr><wbr> &lt;asp:Button ID="btnSend" runat="server" Text="发送" onclick="btnSend_Click" /&gt;<br><wbr><wbr><wbr> &lt;/div&gt;<br><wbr><wbr><wbr> &lt;/form&gt;</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

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<wbr><wbr><wbr> protected void btnSend_Click(object sender, EventArgs e)<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> for (int i = 0; i &lt; <strong>Request.Files.Count</strong>; i++)<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> if (!string.IsNullOrEmpty(<strong>Request.Files[i].FileName</strong>))<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> Request.Files[i].SaveAs<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>(Path.Combine(Server.MapPath("files"), Path.GetFileName(Request.Files</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

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