1.添加javascript代码
<script type="text/javascript" language="javascript">
function Preview(imgFile)
{
document.getElementById("pic").filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgFile.value;
}
</script>
2.FileUpload控件添加
<asp:FileUpload runat="server" ID="imgFile" onchange="javascript:Preview(this);" />
3.预览图显示
<div id="pic" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);400px;height:300px;"></div>