41 lines
1.3 KiB
C#
41 lines
1.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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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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using System.Text;
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namespace NzbDrone.Core.Datastore
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{
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public static class PagingSpecExtensions
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{
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public static Expression<Func<TModel, object>> OrderByClause<TModel>(this PagingSpec<TModel> pagingSpec)
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{
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return CreateExpression<TModel>(pagingSpec.SortKey);
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}
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public static int PagingOffset<TModel>(this PagingSpec<TModel> pagingSpec)
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{
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return (pagingSpec.Page - 1)*pagingSpec.PageSize;
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}
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private static Expression<Func<TModel, object>> CreateExpression<TModel>(string propertyName)
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{
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Type type = typeof(TModel);
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ParameterExpression parameterExpression = Expression.Parameter(type, "x");
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Expression expressionBody = parameterExpression;
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var splitPropertyName = propertyName.Split('.').ToList();
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foreach (var property in splitPropertyName)
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{
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expressionBody = Expression.Property(expressionBody, property);
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}
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expressionBody = Expression.Convert(expressionBody, typeof(object));
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return Expression.Lambda<Func<TModel, object>>(expressionBody, parameterExpression);
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}
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}
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}
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