public class CompositeExpression : FilterExpression 

using System.Collections.Generic;
using AIR.Services.Common.Filter.Data;
            
class SnippetCompositeFilterExample
{
    private static List<Filter> GetCompositeFilter()
    {
        List<Filter> filters = new List<Filter>();
            
        CompositeExpression expression1 = new CompositeExpression()
        {
            FilterExpressions = new List<FilterExpression>()
                {
                    new SimpleExpression()
                    {
                        AppliedEntity = "Locations",
                        PropertyName = "AreaCode",
                        Operator = FilterOperator.IsContainedIn,
                        Value = new List<string>() {"TX", "NY", "CA"}
                    },
                    new SimpleExpression()
                    {
                        AppliedEntity = "Locations",
                        PropertyName = "YearBuilt",
                        Operator = FilterOperator.IsGreaterThan,
                        Value = 1995
                    }
                },
            LogicalOperator = LogicalOperator.And
        };
    
        CompositeExpression expression2 = new CompositeExpression()
        {
            FilterExpressions = new List<FilterExpression>()
                {
                    new SimpleExpression()
                    {
                        AppliedEntity = "Locations",
                        PropertyName = "Stories",
                        Operator = FilterOperator.IsGreaterThan,
                        Value = 4
                    },
                    new SimpleExpression()
                    {
                        AppliedEntity = "Locations",
                        PropertyName = "Stories",
                        Operator = FilterOperator.IsLessThan,
                        Value = 9
                    }
                },
            LogicalOperator = LogicalOperator.And
        };
    
        CompositeExpression expression = new CompositeExpression()
        {
            FilterExpressions = new List<FilterExpression>()
                {
                    expression1,
                    expression2
                },
            LogicalOperator = LogicalOperator.And
        };
            
        Filter filter = new Filter() { Expression = expression };
        filters.Add(filter);
        return filters;
    }
}