rohancragg - Why is SPListItem always ReadOnly?

Friday, May 28, 2004

Dim targetWeb As SPWeb = SPControl.GetContextWeb(Context).Webs.Item("sites/IT")
Dim docLib As SPDocumentLibrary = CType(targetWeb.Lists.Item(New Guid(targetFolderGUID)), SPDocumentLibrary)
Dim docLibFile As SPFile = docLib.RootFolder.Files.Add(fileName, fileContents)
Dim docItem As SPListItem = docLibFile.Item
docItem.Fields("Category") = "General"

If I attempt to set the value of a field (i.e. a Column) in a List, the complier complains that:

Property 'Item' is 'ReadOnly'

Anyone know why I shouldnt be allowed to do it this way?!

UPDATE: the following code is what I was looking for...

docItem("Category") = "General"
docItem.Update()

Friday, May 28, 2004 8:01:00 PM (GMT Standard Time, UTC+00:00)

Comments [5] -
SharePoint

Friday, February 25, 2005 11:35:39 AM (GMT Standard Time, UTC+00:00)

Rohan Cragg

Friday, February 25, 2005 11:35:39 AM (GMT Standard Time, UTC+00:00)

Strange, almost seems like a VB problem. 'ReadOnly' on a property causes all of the properties of that item to also be read only? Obviously 'Item' itself needs to be read-only since it doesn't make sense to change the item that corresponds to the file, but there's no reason that editable fields on the item should be read-only.
 
 Have you tried doing it in C#?

Friday, February 25, 2005 11:35:40 AM (GMT Standard Time, UTC+00:00)

Thanks JD, you're kinda right. Not knowing C# very well this was daunting for me but it inadvertantly led me to the answer! The following works fine:
 
 docItem["Category"] = "General";
 docItem.Update();
 
 docItem("Category") = "General"
 docItem.Update()
 
 This feels wrong because I felt like this syntax meant that I was replacing the SPList object (whose name is "Category") with an Object = "General".
 
 Why does the object model let you do it this way, and not the way I was trying?! Weird... but I'm happy now!!!

Rohan Cragg

Friday, February 25, 2005 11:35:40 AM (GMT Standard Time, UTC+00:00)

My brain completely glossed over the fact you were calling the fields accessor instead of the implicit value accessor because I knew what you were trying to do.
 
 Sometimes approaching the problem from a different direction, even if it's the wrong one, gets you there in the end. :)

Friday, February 25, 2005 11:35:40 AM (GMT Standard Time, UTC+00:00)

when the object has a object type property ,it always be seted readonly . because,it may easy to deal with o/r map .

Snowman

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