Displaying List Items From One Site Into Another Site

SharePoint Designer 2010 allows you to save a list view (which is simply a web part) as a webpart either in the top site gallery or as a file. You can then insert the web part into a parent or sub site to view the original (and any updates to) list items at the other site. This works between parent and sub site or the other way round. However, there seems to be an issue with saving the web part to the gallery directly. Instead, use the Save To File option.

Open the site where the original list is located in SharePoint Designer 2010, navigate to the list and select a view to export. Open the view and select the xsltview web part. From List View Tools, select the web part tab. Then, select To File (from save web part group). Type a name for the file (leave the extension as is) and answer Yes to the dialog that follows (do you want to show list data …).
Now, from your site collection’s site settings, select Galleries – Web parts. Click Documents from the ribbon’s Library Tools and upload the file you have just saved. Select a title and a group for your web part (so you’ll find it easily later). Now, in the other site, on a web part page (or any web part zone on a page), add a web part and select your group then your web part.
Saving to gallery directly seems to miss the Web ID (GUID) in the web part xml source (the element ) which references where the original list lives. You can edit the web part and fix it, of course, but easier to just save to file.
Note: if adding the web part from the browser results in an “unexpected error” and you are asked to open the page in maintenance mode, do so and try to add the web part from SharePoint Designer 2010. This was the case with a tasks list and may also apply to lists with workflows.

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