src/EasyFrameWork/LINQ/Query.cs

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/* http://www.zkea.net/ 
 * Copyright (c) ZKEASOFT. All rights reserved. 
 * http://www.zkea.net/licenses */

using System;
using System.Collections.ObjectModel;
using System.Linq.Expressions;
using System.Reflection;

namespace Easy.LINQ
{
    public class Query
    {
        public enum Operators
        {
            None = 0,
            Equal = 1,
            GreaterThan = 2,
            GreaterThanOrEqual = 3,
            LessThan = 4,
            LessThanOrEqual = 5,
            Contains = 6,
            StartWith = 7,
            EndWidth = 8,
            Range = 9
        }
        public enum Condition
        {
            OrElse = 1,
            AndAlso = 2
        }
        public string Name { get; set; }
        public Operators Operator { get; set; }
        public object Value { get; set; }
        public object ValueMin { get; set; }
        public object ValueMax { get; set; }
    }

    public class QueryCollection : Collection<Query>
    {
        public Expression<Func<T, bool>> AsExpression<T>(Query.Condition? condition = Query.Condition.OrElse) where T : class
        {
            Type targetType = typeof(T);
            TypeInfo typeInfo = targetType.GetTypeInfo();
            var parameter = Expression.Parameter(targetType, "m");
            Expression expression = null;
            Func<Expression, Expression, Expression> Append = (exp1, exp2) =>
            {
                if (exp1 == null)
                {
                    return exp2;
                }
                return (condition ?? Query.Condition.OrElse) == Query.Condition.OrElse ? Expression.OrElse(exp1, exp2) : Expression.AndAlso(exp1, exp2);
            };
            foreach (var item in this)
            {
                var property = typeInfo.GetProperty(item.Name);
                if (property == null ||
                    !property.CanRead ||
                    (item.Operator != Query.Operators.Range && item.Value == null) ||