Gridview文件上传控件丢失文件时添加更多行ASP.Net，C＃

时间：2022-11-09 03:35:35

I am having Gridivew with fileupload which has Add more rows operation. When i Click on Add more rows the fileupload control loses the file. I need to save all the added rows on a single submit button which should save all the files on a folder. Kindly help me.

我正在使用带有fileupload的Gridivew,它具有添加更多行操作。当我单击添加更多行时,fileupload控件将丢失该文件。我需要将所有添加的行保存在单个提交按钮上,该按钮应保存文件夹上的所有文件。请帮助我。

Thanks in advance

提前致谢

1 个解决方案

#1

You cannot persist the input type="file" state after an HTTPPost. ( In ASP.NET jargon this will translate as cannot persist asp:FileUploads value after PostBack ).

在HTTPPost之后,您无法保持输入类型=“文件”状态。 (在ASP.NET术语中,这将转换为无法在PostBack之后保持asp:FileUploads值)。

Its designed that way to address security issues. There are so many examples of the same question answered here at * ( search it ). There is a Session hack that provides a workaround but its for single file. Link here: https://*.com/a/18656681/17447

它旨在解决安全问题。 *上有很多相同问题的例子(搜索它)。有一个会话黑客提供了一个解决方法,但它的单个文件。链接到这里:https://*.com/a/18656681/17447

Theoretically you could still do it using a Dictionary<int, FileUpload>. The first parameter will the GridViewRow.RowIndex and the second parameter would be the asp:FileUpload control on that row. You can start by adding all rows at the first PostBack to a session and then updating it when file.HasFile and so. But IMHO, don't do that because

从理论上讲,你仍然可以使用Dictionary 来完成它。第一个参数是GridViewRow.RowIndex,第二个参数是该行的asp:FileUpload控件。您可以首先将第一个PostBack中的所有行添加到会话中,然后在file.HasFile等时更新它。但恕我直言,不要那样做因为 ,fileupload>

  1. Its extremely complicated.

    2. 它非常复杂。

  2. Bad UX, it confuses the user. He wont know if there really is a file.

    3. 糟糕的用户体验,它会让用户感到困惑。他不知道是否真的有档案。

  3. Clutters the ViewState immensely.

    4. 极大地破坏了ViewState。

So these are the things you can do,

所以这些是你可以做的事情,

  1. Prompt the user that files will be lost when they click to add the files by asking their confirmation.

    2. 提示用户在单击添加文件时通过询问确认文件将丢失。

  2. Put a textbox and button asking user to pre-enter the number of files they want to add.

    3. 放置一个文本框和按钮,要求用户预先输入要添加的文件数。

  3. Use a third party plugin that use ajax to add rows.(jqGrid and datatables.net are good.)

    4. 使用第三方插件使用ajax添加行。(jqGrid和datatables.net很好。)

#1

You cannot persist the input type="file" state after an HTTPPost. ( In ASP.NET jargon this will translate as cannot persist asp:FileUploads value after PostBack ).

在HTTPPost之后,您无法保持输入类型=“文件”状态。 (在ASP.NET术语中,这将转换为无法在PostBack之后保持asp:FileUploads值)。

Its designed that way to address security issues. There are so many examples of the same question answered here at * ( search it ). There is a Session hack that provides a workaround but its for single file. Link here: https://*.com/a/18656681/17447

它旨在解决安全问题。 *上有很多相同问题的例子(搜索它)。有一个会话黑客提供了一个解决方法,但它的单个文件。链接到这里:https://*.com/a/18656681/17447

Theoretically you could still do it using a Dictionary<int, FileUpload>. The first parameter will the GridViewRow.RowIndex and the second parameter would be the asp:FileUpload control on that row. You can start by adding all rows at the first PostBack to a session and then updating it when file.HasFile and so. But IMHO, don't do that because

从理论上讲,你仍然可以使用Dictionary 来完成它。第一个参数是GridViewRow.RowIndex,第二个参数是该行的asp:FileUpload控件。您可以首先将第一个PostBack中的所有行添加到会话中,然后在file.HasFile等时更新它。但恕我直言,不要那样做因为 ,fileupload>

  1. Its extremely complicated.

    2. 它非常复杂。

  2. Bad UX, it confuses the user. He wont know if there really is a file.

    3. 糟糕的用户体验,它会让用户感到困惑。他不知道是否真的有档案。

  3. Clutters the ViewState immensely.

    4. 极大地破坏了ViewState。

So these are the things you can do,

所以这些是你可以做的事情,

  1. Prompt the user that files will be lost when they click to add the files by asking their confirmation.

    2. 提示用户在单击添加文件时通过询问确认文件将丢失。

  2. Put a textbox and button asking user to pre-enter the number of files they want to add.

    3. 放置一个文本框和按钮,要求用户预先输入要添加的文件数。

  3. Use a third party plugin that use ajax to add rows.(jqGrid and datatables.net are good.)

    4. 使用第三方插件使用ajax添加行。(jqGrid和datatables.net很好。)

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