本文介绍了文件上传控制不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
文件名和扩展名是空的.请帮忙.
ASPX 文件代码:
<tr><td colspan="3" style="height:0px"><div id="trFile" runat="server" class="inlineGridAddAddress"><table cellpadding="0" cellspacing="0"><tr><td><div class="formFieldName"><asp:RequiredFieldValidator ID="reqFile" runat="server"ControlToValidate="fileUpload" ErrorMessage="请选择文件"ValidationGroup="Save" CssClass="Validations" ></asp:RequiredFieldValidator></div></td></tr><tr><td><asp:Label ID="lblFile" runat="server">文件:</asp:Label></td><td><asp:FileUpload ID="fileUpload" runat="server"/></div></td><td class="tdformFieldValueLogin" style="width:350px;padding-left:50px"><asp:ImageButton ID="btnFileUploadSave" runat="server" ValidationGroup="Save"ImageUrl="~/App_Themes/Default/images/update.png" ToolTip="保存"高度="18px" onclick="btnFileUploadSave_Click"/><asp:ImageButton ID="btnFileUploadCancel" ImageUrl="~/App_Themes/Default/images/cancel.png"runat="server" ToolTip="Cancel" Height="18px"/></td></tr><tr><td><div class="formSmallTextAreaName"><asp:Label ID="lblDescription" runat="server">描述:</asp:Label></div></td><td><div class="formSmallTextAreaValue"><asp:RegularExpressionValidator ID="revNote"runat="服务器" ControlToValidate="txtDescription"ValidationExpression="^[sS]{0,4096}$"Text="最多允许 4096 个字符."CssClass="验证"显示="动态"></asp:RegularExpressionValidator><asp:TextBox ID="txtDescription"runat="server" CssClass="textEntry1"TextMode="MultiLine" MaxLength="4096" 宽度="218px"></asp:文本框></div></td></tr></表></div></td></tr>CS 文件代码:
protected void btnFileUploadSave_Click(object sender, ImageClickEventArgs e){字符串路径 = Server.MapPath(".") + "\Files\" + this.fileUpload.FileName;字符串文件扩展 = System.IO.Path.GetExtension(this.fileUpload.FileName).ToLower();if (fileExtension == ".txt" || fileExtension == ".doc" || fileExtension == ".docx" || fileExtension == ".zip" || fileExtension == ".rar" || fileExtension ==".cs" || fileExtension == ".ppt" || fileExtension == ".pdf" || fileExtension == ".html" || fileExtension == ".jpg" || fileExtension == ".gif" || fileExtension == ".bmp" || fileExtension == ".png" || fileExtension == ".tif" || fileExtension == ".rm" || fileExtension == ".mp3" || fileExtension == ".xls"){this.fileUpload.PostedFile.SaveAs(path);}}
解决方案 如果您将 UploadControl 放在 UpdatePanel 中(Ajax 的东西)，默认情况下它不会工作.使用更新面板、文件上传控件并使用 PostBackTrigger 控件强制 postback 仅用于文件上传控件
查看以下链接
文件在 UpdatePanel 中上传，ASP.NET AJAX
File name and extension are empty. Please help.
ASPX FILE CODE:
<tr>
<td colspan="3" style="height:0px">
<div id="trFile" runat="server" class="inlineGridAddAddress">
<table cellpadding="0" cellspacing="0">
<tr>
<td>
<div class="formFieldName">
<asp:RequiredFieldValidator ID="reqFile" runat="server"
ControlToValidate="fileUpload" ErrorMessage="Please select File"
ValidationGroup="Save" CssClass="Validations" ></asp:RequiredFieldValidator>
</div>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblFile" runat="server">File:</asp:Label>
</td>
<td>
<div>
<asp:FileUpload ID="fileUpload" runat="server" />
</div>
</td>
<td class="tdformFieldValueLogin" style="width:350px;padding-left:50px">
<asp:ImageButton ID="btnFileUploadSave" runat="server" ValidationGroup="Save"
ImageUrl="~/App_Themes/Default/images/update.png" ToolTip="Save"
Height="18px" onclick="btnFileUploadSave_Click"/>
<asp:ImageButton ID="btnFileUploadCancel" ImageUrl="~/App_Themes/Default/images/cancel.png"
runat="server" ToolTip="Cancel" Height="18px" />
</td>
</tr>
<tr>
<td>
<div class="formSmallTextAreaName">
<asp:Label ID="lblDescription" runat="server">Description:</asp:Label>
</div>
</td>
<td>
<div class="formSmallTextAreaValue">
<asp:RegularExpressionValidator ID="revNote"
runat="server" ControlToValidate="txtDescription"
ValidationExpression="^[sS]{0,4096}$"
Text="Maximum 4096 characters are allowed."
CssClass="Validations" Display="Dynamic">
</asp:RegularExpressionValidator>
<asp:TextBox ID="txtDescription"
runat="server" CssClass="textEntry1"
TextMode="MultiLine" MaxLength="4096" Width="218px">
</asp:TextBox>
</div>
</td>
</tr>
</table>
</div>
</td>
</tr>
CS FILE CODE:
protected void btnFileUploadSave_Click(object sender, ImageClickEventArgs e)
{
string path = Server.MapPath(".") + "\Files\" + this.fileUpload.FileName;
string fileExtension = System.IO.Path.GetExtension(this.fileUpload.FileName).ToLower();
if (fileExtension == ".txt" || fileExtension == ".doc" || fileExtension == ".docx" || fileExtension == ".zip" || fileExtension == ".rar" || fileExtension == ".cs" || fileExtension == ".ppt" || fileExtension == ".pdf" || fileExtension == ".html" || fileExtension == ".jpg" || fileExtension == ".gif" || fileExtension == ".bmp" || fileExtension == ".png" || fileExtension == ".tif" || fileExtension == ".rm" || fileExtension == ".mp3" || fileExtension == ".xls")
{
this.fileUpload.PostedFile.SaveAs(path);
}
}
解决方案 If you're putting your UploadControl in an UpdatePanel (Ajax stuff), it won't work by default. Use Update Panel, File Upload Control and use a PostBackTrigger Control to force a postback only for the File Upload Control
Check out the following link
File Upload in UpdatePanel, ASP.NET AJAX
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