38 lines
1.6 KiB
C#
38 lines
1.6 KiB
C#
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using System;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace BLL
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{
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public static class SortConditionHelper
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{
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public static IQueryable<T> DataSorting<T>(IQueryable<T> source, string sortExpression, string sortDirection)
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{
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string sortingDir = string.Empty;
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if (sortDirection.ToUpper().Trim() == "ASC")
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sortingDir = " OrderBy ";
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else if (sortDirection.ToUpper().Trim() == "DESC")
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sortingDir = " OrderByDescending ";
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ParameterExpression param = Expression.Parameter(typeof(T), sortExpression);
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PropertyInfo pi = typeof(T).GetProperty(sortExpression);
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Type[] types = new Type[2];
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types[0] = typeof(T);
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types[1] = pi.PropertyType;
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Expression expr = Expression.Call(typeof(Queryable), sortingDir, types, source.Expression, Expression.Lambda(Expression.Property(param, sortExpression), param));
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IQueryable<T> query = source.AsQueryable().Provider.CreateQuery<T>(expr);
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return query;
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}
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public static IQueryable<T> DataPaging<T>(IQueryable<T> source, int pageNumber, int pageSize)
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{
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return source.Skip(pageNumber * pageSize).Take(pageSize);
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}
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public static IQueryable<T> SortingAndPaging<T>(IQueryable<T> source, string sortExpression, string sortDirection, int pageNumber, int pageSize)
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{
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IQueryable<T> query = DataSorting<T>(source, sortExpression, sortDirection);
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return DataPaging(query, pageNumber, pageSize);
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}
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}
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}
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