code/Athena0.0.1/common/Util/ExpressionHelper.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;

namespace Athena.common.Util
{
    public enum SearchMethod
    {
        /// <summary>  
        /// 等于  
        /// </summary>  
        Equal = 0,

        /// <summary>  
        /// 小于  
        /// </summary>  
        LessThan = 1,

        /// <summary>  
        /// 大于  
        /// </summary>  
        GreaterThan = 2,

        /// <summary>  
        /// 小于等于  
        /// </summary>  
        LessThanOrEqual = 3,

        /// <summary>  
        /// 大于等于  
        /// </summary>  
        GreaterThanOrEqual = 4,

        /// <summary>  
        /// Like  
        /// </summary>  
        Like = 5,
        /// <summary>  
        /// 不等于  
        /// </summary>  
        NotEqual = 6
    }  

    public class ExpressionHelper
    {
        /// <summary>
        /// 将条件组合成一个Lambda表达式
        /// </summary>
        /// <typeparam name="T">类</typeparam>
        /// <param name="field">类的字段</param>
        /// <param name="method">条件方法</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        public static Expression<Func<T, bool>> CreateExpression<T>(string field,SearchMethod method,object value) where T:class
        {
            ParameterExpression left = Expression.Parameter(typeof(T), "m");//m=>
            Expression right = null;
            switch (method)