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+---
+title: Persist Grid Filter Operator After Value Clear
+description: Learn how to set the filter operator of a Grid column, so that it's not lost after clearing the filter value.
+type: how-to
+page_title: How to Persist Grid Filter Operator After Clearing the Value
+slug: grid-kb-persist-filter-operator
+tags: telerik, blazor, grid, filter
+ticketid: 1694386
+res_type: kb
+---
+
+## Environment
+
+
+
+
+
Product
+
+ Grid for Blazor,
+ TreeList for Blazor
+
+
+
+
+
+## Description
+
+This KB article answers the following questions:
+
+* How to keep the same filter operator across multiple filter operations in a Grid column?
+* The set filter operator is lost when I clear the filter value. How to persist it?
+* How to maintain a non-default filter operator when the user removes the current filter value?
+
+## Solution
+
+The suggested approach below applies to both the Grid and the TreeList.
+
+1. Subscribe to the [Grid `OnStateChanged` event](slug:grid-state#events).
+1. Check the [`PropertyName` value in the `OnStateChanged` event argument](slug:telerik.blazor.components.gridstateeventargs-1) to detect when the user is filtering.
+1. Save the currently applied filter operators for each filtered column to some custom collection.
+1. Compare the previously saved filters to the current ones. When the user removes the filter of a column, save the previous filter operator.
+1. Once the user filters by a column that has a saved filter operator, restore this operator.
+
+>caption Persist Grid filter operator
+
+````RAZOR
+@using Telerik.DataSource
+
+
+
+
+
+
+
+
+
+
+
+
+@code {
+ private List GridData { get; set; } = new();
+
+ private List SavedFilterDescriptors { get; set; } = new();
+ private Dictionary ClearedFilterOperators { get; set; } = new();
+
+ private void OnGridStateChanged(GridStateEventArgs args)
+ {
+ // Check if the user has changed the filter configuration
+ if (args.PropertyName == "FilterDescriptors")
+ {
+ IEnumerable currentFilters = args.GridState.FilterDescriptors.OfType();
+
+ // Iterate previously saved filters and compare to current ones
+ foreach (FilterDescriptor savedOneColumnFd in SavedFilterDescriptors)
+ {
+ string savedMember = savedOneColumnFd.Member;
+ object savedFilterValue = savedOneColumnFd.Value;
+ FilterOperator savedOperator = savedOneColumnFd.Operator;
+
+ if (!string.IsNullOrEmpty(savedFilterValue?.ToString()))
+ {
+ // Search for current filters for the saved column
+ FilterDescriptor? currentOneColumnFd = currentFilters
+ .FirstOrDefault(x => x.FilterDescriptors.OfType().Any(y => y.Member == savedMember))?
+ .FilterDescriptors.OfType().First();
+
+ // Check if filter for the current column no longer exists
+ if (currentOneColumnFd is null)
+ {
+ // Save filter operator for future restore
+ if (ClearedFilterOperators.ContainsKey(savedMember))
+ {
+ ClearedFilterOperators[savedMember] = savedOperator;
+ }
+ else
+ {
+ ClearedFilterOperators.Add(savedMember, savedOperator);
+ }
+ }
+ }
+ }
+
+ SavedFilterDescriptors.Clear();
+
+ // Iterate current filters
+ foreach (CompositeFilterDescriptor currentOneColumnCfd in currentFilters)
+ {
+ IEnumerable currentOneColumnFds = currentOneColumnCfd.FilterDescriptors.OfType();
+
+ string currentMember = currentOneColumnFds.First().Member;
+ FilterOperator currentOperator = currentOneColumnFds.First().Operator;
+ object currentValuŠµ = currentOneColumnFds.First().Value;
+
+ // Detect new filter value after clearing and restore previous operator
+ if (ClearedFilterOperators.ContainsKey(currentMember))
+ {
+ currentOneColumnFds.First().Operator = currentOperator = ClearedFilterOperators[currentMember];
+ ClearedFilterOperators.Remove(currentMember);
+ }
+
+ // Save current filter state
+ SavedFilterDescriptors.Add(new FilterDescriptor() { Member = currentMember, Operator = currentOperator, Value = currentValuŠµ });
+ }
+ }
+ }
+
+ protected override void OnInitialized()
+ {
+ var rnd = Random.Shared;
+
+ for (int i = 1; i <= 57; i++)
+ {
+ GridData.Add(new Product()
+ {
+ Id = i,
+ Name = $"Name {i} {(char)rnd.Next(65, 91)}{(char)rnd.Next(65, 91)}",
+ Group = $"Group {i % 3 + 1}",
+ Price = rnd.Next(1, 100) * 1.23m,
+ Quantity = rnd.Next(0, 10000),
+ Released = DateTime.Today.AddDays(-rnd.Next(60, 1000)),
+ Discontinued = i % 4 == 0
+ });
+ }
+ }
+
+ public class Product
+ {
+ public int Id { get; set; }
+ public string Name { get; set; } = string.Empty;
+ public string Group { get; set; } = string.Empty;
+ public decimal Price { get; set; }
+ public int Quantity { get; set; }
+ public DateTime Released { get; set; }
+ public bool Discontinued { get; set; }
+ }
+}
+````
+
+## See Also
+
+* [Grid State](slug:grid-state)
+* [Grid Filtering](slug:components/grid/filtering)
+* [TreeList State](slug:treelist-state)
+* [TreeList Filtering](slug:treelist-filtering)