using Furion.LinqBuilder;
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using System.Linq.Expressions;
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namespace Admin.NET.Core
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{
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public static class QueryableExstenstions
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{
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/// <summary>
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/// 根据分页查询参数为IQueryable附加过滤条件
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/// </summary>
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/// <param name="source"></param>
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/// <param name="searchParameters"></param>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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public static IQueryable<T> Search<T>(this IQueryable<T> source, PageInputBase searchParameters)
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{
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if (searchParameters.SearchParameters == null)
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return source;
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var results = source.Where(LambdaExpressionBuilder.BuildLambda<T>(searchParameters.SearchParameters));
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//无排序字段
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if (searchParameters.SortField.IsNullOrEmpty())
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return results;
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return results.ApplyOrder(searchParameters.SortField, searchParameters.SortOrder);
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}
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/// <summary>
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/// 附加排序
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/// </summary>
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/// <param name="source"></param>
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/// <param name="property"></param>
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/// <param name="sortMethod"></param>
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/// <typeparam name="T"></typeparam>
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/// <returns></returns>
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private static IOrderedQueryable<T> ApplyOrder<T>(this IQueryable<T> source, string property, string sortMethod)
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{
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var type = typeof(T);
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var parameterExp = Expression.Parameter(type, "x");
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var propertyInfo = type.GetProperty(property);
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var propertyExp = Expression.Property(parameterExp, propertyInfo);
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var lambdaExp = Expression.Lambda<Func<T, dynamic>>(propertyExp, parameterExp);
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return sortMethod == "descend" ? source.OrderByDescending(lambdaExp) : source.OrderBy(lambdaExp);
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}
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}
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}
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