图像已保存，但图像标记仍未刷新 [英] Image is saved but still the image tag is not refreshed
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问题描述
大家好，
我有一个图片标签和一个文件上传器上传文件。工作正常。有时用户需要更改已经上传的文件。它也可以正常工作。但问题是即使在上传新图像后，它也会被保存，但早期的图像仍然会显示在图片标记上并且不会刷新。任何帮助都会非常感激。谢谢提前。
我尝试过：
< tr>
< td align =left>选择文件< / td>
< td style =padding-left：5px; padding-right：5px;>：< / td>
< td align =left>
< asp：FileUpload ID =FileUpload1runat =serverclass =txtboxAll/>
< / td>
< / tr>
< / table>
< / td>
< / tr>
< tr>
< td align =center>
< asp：Button ID =but_uploadfilerunat =serverValidationGroup =FirstTabIndex =16
CssClass =btnAllText =Uploadonclick =but_uploadfile_Click/> ;
< asp：按钮ID =btn_Close01runat =serverValidationGroup =FirstTabIndex =17
CssClass =btnAllText =Close/>
< / td>
< / tr>
protected void but_uploadfile_Click（object sender，EventArgs e ）
{
queryusrid = Request.QueryString [cid]。ToString（）;
string oldfilename1 = Path.GetFileName（FileUpload1.FileName）;
// FileInfo file = new FileInfo（FileUpload1.FileName）;
//// var sizeInBytes = file.Length;
//位图img =新位图（FileUpload1.FileName）;
// var imageHeight = img.Height;
// var imageWidth = img.Width;
System.Drawing.Image img = System.Drawing.Image.FromStream（FileUpload1.PostedFile.InputStream）;
int height = img.Height;
int width = img.Width;
if（oldfilename1 ==）
{
Alert.Show（请选择要上传的文件）;
返回;
}
其他
{
string gid2 = lbl_gid.Text;
string ext = Path.GetExtension（FileUpload1.FileName）;
if（ext ==.jpg|| ext ==.JPG|| ext ==。jpeg|| ext ==.JPEG）
{
// if（height> = 180&& height< = 250&& width> = 200&& width< = 250）
if（width == 200&& ; height == 230）
{
string FileExist = objcon.GetDataReadervalue（从IN005_01选择IN005_01_01，其中IN005_01 ='+ gid2 +'和IN005_01_07 ='照片'，价值）;
if（FileExist ==Not Found）
{
string serpath1 = Server.MapPath（〜/ Registeration / ProfilePics /）;
string newfileid1 = GenerateFileID（）;
FileUpload1.SaveAs（serpath1 + newfileid1 + ext）;
string newfileid4 = newfileid1 + ext;
bool ret3 = objcon.Modify（插入IN005_01（IN005_01_01，IN005_01_02，IN005_01_03，IN005_01_06，IN005_01_07，IN005_01）值（'+ newfileid1 +'，'+ newfileid4 +'，'+ oldfilename1 +'，'sumhr'，'photo'，'+ gid2 +'））;
DataList1.DataBind（）;
UpdatePanel7.Update（）;
}
其他
{
字符串文件名= objcon.GetDataReadervalue（从IN005_01选择IN005_01_02，其中IN005_01 ='+ gid2 +'和IN005_01_07 ='照片'，价值）;
string filenameetn = objcon.GetDataReadervalue（从IN005_01中选择IN005_01_01，其中IN005_01 ='+ gid2 +'和IN005_01_07 ='photo'，value）;
string path = Server.MapPath（〜）+\\Registeration+\\ProfilePics+\\+ filename;
if（System.IO.File.Exists（path））
{
System.IO.File.Delete（path）;
string serpath1 = Server.MapPath（〜/ Registeration / ProfilePics /）;
string newfileid1 = filenameetn;
FileUpload1.SaveAs（serpath1 + newfileid1 + ext）;
string newfileid4 = newfileid1 + ext;
bool ret3 = objcon.Modify（更新IN005_01设置IN005_01_02 ='+ newfileid4 +'，IN005_01_03 ='+ oldfilename1 +'，IN005_01_06 ='auto'其中IN005_01_01 ='+ filenameetn +' ）;
//grd_InsEdit.DataBind（）;
DataList1.DataBind（）;
UpdatePanel7.Update（）;
}
}
}
其他
{
Alert.Show（图片大小应宽*高 - （200 * 230px） ）;
返回;
}
}
其他
{
Alert.Show（请上传任何jpg，png，jpeg文件）;
返回;
}
}
}
解决方案
请提及您正在使用的浏览器。如果您是使用IE然后它缓存旧图像，因此你需要在更新面板之前编写Response.Cache.SetCacheability（HttpCacheability.NoCache）;代码块。在firefox和chrome中它应该更新。
参考：图片是在updatePanel.Update中没有刷新ASP.NET论坛 [ ^ ]
另一个主题 [ ^ ]
< a href =https://forums.asp.net/t/1415400.aspx>图片上传在updatepanel中不起作用ASP.NET论坛 [ ^ ]
Hi All,
I have an image tag and a fileuploader to upload file.It works fine .Sometimes the user need to change the already uploaded file.It also works fine .But the problem is that even after uploading new image ,it is saved ,but the earlier image is still showing on image tag and is not refreshed.Any help will be really appreciated .Thanks in Advance.
What I have tried:
<tr>
<td align="left">Choose file </td>
<td style="padding-left:5px; padding-right:5px;">:</td>
<td align="left">
<asp:FileUpload ID="FileUpload1" runat="server" class="txtboxAll" />
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="center">
<asp:Button ID="but_uploadfile" runat="server" ValidationGroup="First" TabIndex="16"
CssClass="btnAll" Text="Upload" onclick="but_uploadfile_Click" />
<asp:Button ID="btn_Close01" runat="server" ValidationGroup="First" TabIndex="17"
CssClass="btnAll" Text="Close" />
</td>
</tr>
protected void but_uploadfile_Click(object sender, EventArgs e)
{
queryusrid = Request.QueryString["cid"].ToString();
string oldfilename1 = Path.GetFileName(FileUpload1.FileName);
//FileInfo file = new FileInfo(FileUpload1.FileName);
////var sizeInBytes = file.Length;
//Bitmap img = new Bitmap(FileUpload1.FileName);
//var imageHeight = img.Height;
//var imageWidth = img.Width;
System.Drawing.Image img = System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream);
int height = img.Height;
int width = img.Width;
if (oldfilename1 == "")
{
Alert.Show("Please select a file to upload");
return;
}
else
{
string gid2 = lbl_gid.Text;
string ext = Path.GetExtension(FileUpload1.FileName);
if (ext == ".jpg" || ext == ".JPG" || ext == ".jpeg" || ext == ".JPEG")
{
//if (height >= 180 && height <= 250 && width >= 200 && width <= 250)
if (width == 200 && height == 230)
{
string FileExist = objcon.GetDataReadervalue("select IN005_01_01 from IN005_01 where IN005_01='" + gid2 + "' and IN005_01_07='photo'", "value");
if (FileExist == "Not Found")
{
string serpath1 = Server.MapPath("~/Registeration/ProfilePics/");
string newfileid1 = GenerateFileID();
FileUpload1.SaveAs(serpath1 + newfileid1 + ext);
string newfileid4 = newfileid1 + ext;
bool ret3 = objcon.Modify("insert into IN005_01(IN005_01_01,IN005_01_02,IN005_01_03,IN005_01_06,IN005_01_07,IN005_01)Values('" + newfileid1 + "','" + newfileid4 + "','" + oldfilename1 + "','sumhr','photo','" + gid2 + "')");
DataList1.DataBind();
UpdatePanel7.Update();
}
else
{
string filename = objcon.GetDataReadervalue("select IN005_01_02 from IN005_01 where IN005_01='" + gid2 + "' and IN005_01_07='photo'", "value");
string filenameetn = objcon.GetDataReadervalue("select IN005_01_01 from IN005_01 where IN005_01='" + gid2 + "' and IN005_01_07='photo'", "value");
string path = Server.MapPath("~") + "\\Registeration" + "\\ProfilePics" + "\\" + filename;
if (System.IO.File.Exists(path))
{
System.IO.File.Delete(path);
string serpath1 = Server.MapPath("~/Registeration/ProfilePics/");
string newfileid1 = filenameetn;
FileUpload1.SaveAs(serpath1 + newfileid1 + ext);
string newfileid4 = newfileid1 + ext;
bool ret3 = objcon.Modify("update IN005_01 set IN005_01_02='" + newfileid4 + "',IN005_01_03='" + oldfilename1 + "',IN005_01_06='auto' where IN005_01_01='" + filenameetn + "'");
//grd_InsEdit.DataBind();
DataList1.DataBind();
UpdatePanel7.Update();
}
}
}
else
{
Alert.Show("Image size should Width*Height-(200*230px)");
return;
}
}
else
{
Alert.Show("Please upload any jpg,png,jpeg files");
return;
}
}
} 解决方案
Please mention which browser you are using.If you are using IE then it cache the old image hence you need to writeResponse.Cache.SetCacheability(HttpCacheability.NoCache);code block before updating the panel.In firefox and chrome it should update.
Reference:Image is not refreshed in updatePanel.Update | The ASP.NET Forums[^]
Another thread[^]
Image upload not working in updatepanel | The ASP.NET Forums[^]
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