dotnet + LinQ 按照指定的字段 和 排序方式排序
1 /// <summary> 2 /// 根据指定属性名称对序列进行排序 3 /// </summary> 4 /// <typeparam name="TSource">source中的元素的类型</typeparam> 5 /// <param name="source">一个要排序的值序列</param> 6 /// <param name="property">属性名称</param> 7 /// <param name="descending">是否降序</param> 8 /// <returns></returns> 9 public static IQueryable<TSource> OrderBy<TSource>(this IQueryable<TSource> source, string property, bool descending) where TSource : class 10 { 11 ParameterExpression param = Expression.Parameter(typeof(TSource), "c"); 12 PropertyInfo pi = typeof(TSource).GetProperty(property); 13 MemberExpression selector = Expression.MakeMemberAccess(param, pi); 14 LambdaExpression le = Expression.Lambda(selector, param); 15 string methodName = (descending) ? "OrderByDescending" : "OrderBy"; 16 MethodCallExpression resultExp = Expression.Call(typeof(Queryable), methodName, new Type[] { typeof(TSource), pi.PropertyType }, source.Expression, le); 17 return source.Provider.CreateQuery<TSource>(resultExp);
items = SortLinQUtil.OrderBy(items, param.orderName, true);
