1

In my project, I have to upload a new file to SharePoint library which base on specific existing item.

For example:

The original library have 2 items which has 10 custom columns:
itemA: c1 c2 c3 c4 c5 c6 c7 c8 c9 c10
itemB: v1 v2 v3 v4 v5 v6 v7 v8 v9 v10

But now, I have to upload a new item (itemC) which its all columns value are clone from itemA (include build-in columns, Author,Editor, etc.).

Now:
itemA: c1 c2 c3 c4 c5 c6 c7 c8 c9 c10
itemB: v1 v2 v3 v4 v5 v6 v7 v8 v9 v10
itemC: c1 c2 c3 c4 c5 c6 c7 c8 c9 c10

I have tried to get all columns and its value, dataType via SPFieldCollection. However, there are too many columns (75) which I don't know which one should be kept.

var interalName = field.InternalName;
var TypeDisplayName  = field.TypeDisplayName;
var dataType:  field.Type;
var value = item[interalName];

Result: too many, I list 3 of those build-in column:

--------------------------------------
field name: MetaInfo
field TypeDisplayName : Lookup
field dataType: Lookup
field value: vti_thumbnailexists:BW|false
------------------------------------------
field name: DocIcon
field TypeDisplayName : Computed
field dataType: Computed
field value: png
-----------------------------------------
field name: _EditMenuTableStart2
field TypeDisplayName : Computed
field dataType: Computed
field value: 146
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2

You need to copy only c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 columns. Other columns are internal columns to maintain some other metadata. Also Created By/ modified by cannot be copied from itemA, it will be updated based on the user uploading / updating the metadata.

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7
  • Thank you for your answer, but i do need to keep the Created By/ modified .. value of the newest item as same as the specific item (itemA). I find that there are a System.Update(). Do you have any idea to do this?
    – king yau
    Nov 17 '16 at 7:16
  • If you are using server side code then you can keep the created by / modified by same as itemA but in case you are using CSOM code (jQuery/ javascript) to update the values then you cannot update Created by / modified by.
    – Monica Jagani
    Nov 17 '16 at 8:00
  • Sorry, two more questions, 1) how can i identify which column is custom column or build-in column? 2) how to handle some column which of type Look up?
    – king yau
    Nov 17 '16 at 8:42
  • Are you using server side code or client side scripting ?
    – Monica Jagani
    Nov 17 '16 at 8:43
  • 1
    You have two options: 1. Check if the field is a built-in field: SPBuiltInFieldId.Contains(field.Id) 2. Check on the SPField.SourceId (from MSDN): Gets either the namespace that defines a built-in field or, if it a custom field, the GUID that identifies the list or Web site where it was created. Reference from stackoverflow.com/questions/5340746/…
    – Monica Jagani
    Nov 17 '16 at 8:46

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