ClrPlus.Scripting.MsBuild.Packaging.ProjectPlus.LookupItemDefinitionGroup C# (CSharp) Метод

        internal ProjectItemDefinitionGroupElement LookupItemDefinitionGroup(string condition)
        {
            // look it up or create it.
            var label = Pivots.GetExpressionLabel(condition);

            if(string.IsNullOrEmpty(condition)) {
                var result = Xml.ItemDefinitionGroups.FirstOrDefault(each => string.IsNullOrEmpty(each.Label));
                if(result != null) {
                    return result;
                }
            }
            else {
                var result = Xml.ItemDefinitionGroups.FirstOrDefault(each => label == each.Label);
                if(result != null) {
                    return result;
                }
            }
            var idg = Xml.AddItemDefinitionGroup();
            if(!string.IsNullOrEmpty(condition)) {
                idg.Label = label;
                idg.Condition = Pivots.GetMSBuildCondition(Name, condition);
            }
            return idg;
        }