Value filtering for olap report on code behind

public Dictionary<string, object> InitializeOlapGrid(Dictionary<string, object> jsonResult)
 {
 //….
 Dictionary<string, object> filterParams = new Dictionary<string, object>();
 List<Dictionary<string, object>> filterList = new List<Dictionary<string, object>>();
 Dictionary<string, List<Dictionary<string, object>>> filterDictionary = new Dictionary<string, List<Dictionary<string, object>>>();
 Item item = null; string levelUniqueName = "[Cost Centres].[Cost Centre Name].[Cost Centre Name]"; //Assign the level unique name of dimension element which you want to filter
 string axis = "";
 var reportItems = DataManager.CurrentReport.CategoricalElements.List.Union(DataManager.CurrentReport.SeriesElements.List).Where(m => m.ElementValue is DimensionElement);
 foreach (var reportItem in reportItems)
 {
  item = GetReportItem(levelUniqueName, reportItem);
  if (item != null)
  break;
 }
 string currentKey = "ValueFilters";//It is a key which is used to filter the element based on measure values
 if (DataManager.CurrentReport.Tag == null)
 filterDictionary.Add(currentKey, filterList);
 
// Add the following details to filter the elements through code behind
  filterParams.Add("Axis", "COLUMNS");
  filterParams.Add("HierarchyUniqueName", ((item.ElementValue as Element) as DimensionElement).Hierarchy.UniqueName);
  filterParams.Add("LevelUniqueName", levelUniqueName);
  filterParams.Add("Operator", "between");
// You can use the operator here (equals, does not equals, between, not between, greater than, greater than or equal to, less than, less than or equal to)
  filterParams.Add("Value", "18.4,18.45");
  filterParams.Add("LevelDetails", "[Cost Centres].[Cost Centre Name].[Cost Centre Name]", levelUniqueName, ref axis, false, ""));  //Add the exact level detail here
  filterParams.Add("MeasureUniqueName", "[Measures].[Average Employment]");
  filterDictionary[currentKey].Insert(0, filterParams);
  DataManager.CurrentReport.Tag = filterDictionary; //Assign the dictionary to Tag of Olap report
 
  //….
                     
return temp;
}