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i need a method where add various Fields in a Sharepoint List, but these Fields must be in the parameter of this method.

Show me this method and how should I use it.

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up vote 2 down vote accepted

Something like this to get you going perhaps?

 private static void AppendNewFieldToListIfNonExistsent(SPList list, string internalName,
    string displayName, SPFieldType fieldType, Guid? lookupListId = null)
    if (list.Fields.ContainsField(internalName)) return;
    if (fieldType == SPFieldType.Lookup)
        list.Fields.AddLookup(internalName, lookupListId.Value, false);
        list.Fields.Add(internalName, fieldType, false);
    var field = list.Fields.GetFieldByInternalName(internalName);
    field.Title = displayName;
    var view = list.DefaultView;
    if (view.ViewFields.Exists(field.InternalName)) return;

MSDN SPFIeldCollection.Add(SPField)
MSDN SPFieldCollection.Add(String, SPFieldType, Boolean)
MSDN SPFieldCollection.AddLookup Method (String,Guid,Boolean)
MSDN SPFieldCollection.AddLookup Method (String,Guid,Guid,Boolean)

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Tks Man!!! But if this method uses a dictionary as a parameter passing the SPFields. – fbadaro Oct 3 '12 at 20:27
Your method? In that case just loop through them. You could add SPField directly, but it's a bit odd I think because of the SPField constructors – eirikb Oct 3 '12 at 21:08
What is the defintion of EnsureLookupEntities? It appears to be a custom method – vandre Jun 6 '14 at 12:17
@vandre I think it was meant as a helper method which would create the field on the lookup list if non-existing, I didn't include the method (with body) as I didn't find it important. Removed for now. Note that lookupListId can be null here, so a Debug.Assert(lookupListId != null, "lookupListId != null"); could be smart to use. Also, one can do switch on fieldType if necessary. (Since I removed EnsureLookupEntities I also removed SPWeb and LookupField, although field could be used to point to specific field) – eirikb Jun 9 '14 at 17:25

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