src/EasyFrameWork/Extend/ExtQueryable.cs

（完整代码） 2KB 

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

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

namespace Easy.Extend
{
    public static class ExtQueryable
    {
        public static IQueryable<T> OrderBy<T>(this IQueryable<T> source, string ordering)
        {
            var type = typeof(T);
            var property = type.GetProperty(ordering);
            var parameter = Expression.Parameter(type, "p");
            var propertyAccess = Expression.MakeMemberAccess(parameter, property);
            var orderByExp = Expression.Lambda(propertyAccess, parameter);
            MethodCallExpression resultExp = Expression.Call(typeof(Queryable), "OrderBy", new Type[] { type, property.PropertyType }, source.Expression, Expression.Quote(orderByExp));
            return source.Provider.CreateQuery<T>(resultExp);
        }
        public static IQueryable<T> OrderByDescending<T>(this IQueryable<T> source, string ordering)
        {
            var type = typeof(T);
            var property = type.GetProperty(ordering);
            var parameter = Expression.Parameter(type, "p");
            var propertyAccess = Expression.MakeMemberAccess(parameter, property);
            var orderByExp = Expression.Lambda(propertyAccess, parameter);
            MethodCallExpression resultExp = Expression.Call(typeof(Queryable), "OrderByDescending", new Type[] { type, property.PropertyType }, source.Expression, Expression.Quote(orderByExp));
            return source.Provider.CreateQuery<T>(resultExp);
        }

        public static IQueryable<T> ThenBy<T>(this IOrderedQueryable<T> source, string ordering)
        {
            var type = typeof(T);
            var property = type.GetProperty(ordering);
            var parameter = Expression.Parameter(type, "p");
            var propertyAccess = Expression.MakeMemberAccess(parameter, property);
            var orderByExp = Expression.Lambda(propertyAccess, parameter);
            MethodCallExpression resultExp = Expression.Call(typeof(Queryable), "ThenBy", new Type[] { type, property.PropertyType }, source.Expression, Expression.Quote(orderByExp));
            return source.Provider.CreateQuery<T>(resultExp);
        }
        public static IQueryable<T> ThenByDescending<T>(this IOrderedQueryable<T> source, string ordering)
        {
            var type = typeof(T);
            var property = type.GetProperty(ordering);
            var parameter = Expression.Parameter(type, "p");
            var propertyAccess = Expression.MakeMemberAccess(parameter, property);
            var orderByExp = Expression.Lambda(propertyAccess, parameter);
            MethodCallExpression resultExp = Expression.Call(typeof(Queryable), "ThenByDescending", new Type[] { type, property.PropertyType }, source.Expression, Expression.Quote(orderByExp));
            return source.Provider.CreateQuery<T>(resultExp);
        }
    }
}

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