Add various Fields in a Sharepoint List Programmatically

Question

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.

Answer 1

Something like this to get you going perhaps?

private static void AppendNewFieldToListIfNonExistsent(SPWeb web, SPList list, string internalName,
                                                           string displayName, SPFieldType fieldType,
                                                           string lookupList = null, string lookupField = null)
    {
        if (list.Fields.ContainsField(internalName)) return;

        if (fieldType == SPFieldType.Lookup)
        {
            var lookupListId = EnsureLookupEntities(web, lookupList, lookupField);
            list.Fields.AddLookup(internalName, lookupListId, false);
        }
        else
        {
            list.Fields.Add(internalName, fieldType, false);
        }
        var field = list.Fields.GetFieldByInternalName(internalName);
        field.Title = displayName;
        field.Update();
        var view = list.DefaultView;
        if (view.ViewFields.Exists(field.InternalName)) return;
        view.ViewFields.Add(field.InternalName);
        view.Update();
    }

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)