Event Receiver to create a List based on a custom template and on lookup field

Question

Hi
I would like to have an Event Receiver who is firing by addItem in a list calls Seminarliste and is creating each time a new list based on three columns for add.Lists("Title of the list", "Description of the list", "Custom List
Template")
I have a Problem to get the LookupField Title and I am getting a Problem to create a list.
If I debug the code the bold line creates an exception ;(
The following code I have produced:
        public override void ItemAdding(SPItemEventProperties properties)
            base.ItemAdding(properties);
            SPWeb spCurrentSite = properties.OpenWeb();
            SPSite siteCollection = new SPSite("http://win-ue32d37ap2n");
            SPWeb web = siteCollection.OpenWeb();
            SPListCollection lists = web.Lists;
            String curListName = properties.ListTitle;
            if(curListName == "Seminarliste")
                SPListItem curItem = properties.ListItem;
                String curItemListName = properties.AfterProperties["Title"].ToString();
                String curItemDescription = properties.AfterProperties["Beschreibung"].ToString();
                // Lookup field with Option to Chose a template name
                String curItemTemplate = properties.AfterProperties["Template"].ToString();
                SPListTemplateCollection listTemplates = siteCollection.GetCustomListTemplates(web);
                //Error by following line ...
SPListTemplate myTemplate = listTemplates[curItemTemplate];
                web.Lists.Add(curItemListName, curItemDescription, myTemplate);
If somebody had a similar problem in the past and could advice it would be most appreciated ;-)
Thanks in advance ;-)
Kind regards Michael Damaschke

Answer 1

If I understand correctly, the field you use to select the template name is a lookup field? If so, then the problem is the lookup field value is not the name of the template. It is an SPFieldLookupValue, which contains the ID and the string of the lookup.
So you want to separate the template name, like this:
if (item["LookupField"] !=
null)
     string fieldValue = item["LookupField"].ToString();
     SPFieldLookupValue value =
new SPFieldLookupValue(fieldValue);
     int lookupListItemID = value.LookupId;
     string lookupListValue = value.LookupValue;
IF you look at the fieldValue above, you will see it is something like an integer, followed by delimiter ;# and then your template name. you can always just parse the string at the ;# as well if you were so inclined.