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i have defined some site columns which were referenced by some content types. These are used for a ListDefinition and a ListInstance. (Everything is in one Visual Studio Project). Now i would like to embed this list instance to an aplication page, beeing able to show that list and some other stuff at the same page. I definetly want to show the correct SharePoint list and not building (for example) a table.

In some other tests i was able to successfully use "WebPartPages:XsltListViewWebPart..." but in that test i created the list by the SharePoint webpage and not through visual studio. The problem with "WebPartPages:XsltListViewWebPart" is, that i need to enter the correct ListId. I added the ID attribute in the Elements.xml of the ListInstance to avoid a dynamically built id but i always get the error message, that the list was not found (probably removed). I checked the list id of my list (in the address bar of my browser when i click edit list) and found out, that the list id changes every time i build/deploy my project although the id attribute of my list instance definition.

Can please somebody help me, correctly embedding my list?

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Perhaps someone can explain me, why a list instance always get another id although i set the id attribute. If i could force it to keep the same id every time i build/deploy, my above problem would be solved. – Chris Sep 26 '12 at 13:14

2 Answers

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When your list is created, the instance of this list is saved to the content data base, in this time the data base assign a new ID for your list to be sure that this ID is unique.

I think that you can use ListUrl property of XsltListViewWebPart instead of list ID in web part definition. It is unique value for each web.

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If you know the title of your list you could try something like this (here from Feature Event Receiver):

var web = properties.Feature.Parent as SPWeb;
if (web == null) return;
var list = web.Lists["MyList"];
var manager = web.GetLimitedWebPartManager("MyPage.aspx", PersonalizationScope.Shared);
var xsltListViewWebPart = new XsltListViewWebPart { ListId = list.ID };
manager.AddWebPart(xsltListViewWebPart , "MyZone", manager.WebParts.Count + 1);
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thank you for you answer. My problem is, that when i add this code in my Page_Load EventHandler the page (in your example "MyPage.aspx") will not be found on execution. Perhaps the page isn't built at this time? – Chris Sep 25 '12 at 14:35
I was thinking about running this in an Feature Event Receiver, so it will only be run once; when your Feature is activated (and the application page is deployed through some module). – eirikb Sep 25 '12 at 14:37
Page_Load is part of when the page is accessed, as in opened normally in a browser. You can read about the Page Life Cycle on msdn. – eirikb Sep 25 '12 at 14:39
When you say Application Page, do you really mean a Site Page deployed through a module, or a real Application Page, deployed to layouts? – Derek Gusoff Sep 25 '12 at 14:59
if you mean application page read Andrey's response here: sharepoint.stackexchange.com/questions/26508/… – Derek Gusoff Sep 25 '12 at 15:00
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