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This previous post shows how you can create content types in code. The code in this post will show you how you add an item to a list and set the contenttype for that item. An SPItem object has a property called ContentType, but you cannot use that, because it is readonly.
The code to do this looks like this:
SPSite site = new SPSite("http://myportal/testsite"); SPWeb web = site.OpenWeb(); SPList list = web.Lists["ContentTypeTest"]; // We first check if the contenttype is available and then use the id. SPContentType contentType = web.AvailableContentTypes["Proposal"]; if (contentType != null) { SPListItem item2 = list.Items.Add(); item2["ContentTypeId"] = contentType.Id; item2["Title"] = Custom contenttype, set from code!”; item2.Update(); }
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