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LINQ for paging missing episodes

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Mark McDowall 2013-05-06 19:32:43 -07:00
commit d37c8c26c2
26 changed files with 318 additions and 57 deletions
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41
NzbDrone.Core/Datastore/PagingSpecExtensions.cs Normal file
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
namespace NzbDrone.Core.Datastore
{
public static class PagingSpecExtensions
{
public static Expression<Func<TModel, object>> OrderByClause<TModel>(this PagingSpec<TModel> pagingSpec)
{
return CreateExpression<TModel>(pagingSpec.SortKey);
}
public static int PagingOffset<TModel>(this PagingSpec<TModel> pagingSpec)
{
return (pagingSpec.Page - 1)*pagingSpec.PageSize;
}
private static Expression<Func<TModel, object>> CreateExpression<TModel>(string propertyName)
{
Type type = typeof(TModel);
ParameterExpression parameterExpression = Expression.Parameter(type, "x");
Expression expressionBody = parameterExpression;
var splitPropertyName = propertyName.Split('.').ToList();
foreach (var property in splitPropertyName)
{
expressionBody = Expression.Property(expressionBody, property);
}
expressionBody = Expression.Convert(expressionBody, typeof(object));
return Expression.Lambda<Func<TModel, object>>(expressionBody, parameterExpression);
}
}
}