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30 lines
1.2 KiB
30 lines
1.2 KiB
using System.Reflection;
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namespace Connected.Entities
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{
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internal static class QueryableMethods
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{
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static QueryableMethods()
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{
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var queryableMethodGroups = typeof(Queryable)
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.GetMethods(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly)
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.GroupBy(mi => mi.Name)
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.ToDictionary(e => e.Key, l => l.ToList());
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SingleWithoutPredicate = GetMethod(nameof(Queryable.Single), 1, types => new[] { typeof(IQueryable<>).MakeGenericType(types[0]) });
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SingleOrDefaultWithoutPredicate = GetMethod(nameof(Queryable.SingleOrDefault), 1, types => new[] { typeof(IQueryable<>).MakeGenericType(types[0]) });
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MethodInfo GetMethod(string name, int genericParameterCount, Func<Type[], Type[]> parameterGenerator)
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{
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return queryableMethodGroups[name].Single(mi => ((genericParameterCount == 0 && !mi.IsGenericMethod)
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|| (mi.IsGenericMethod && mi.GetGenericArguments().Length == genericParameterCount))
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&& mi.GetParameters().Select(e => e.ParameterType).SequenceEqual(parameterGenerator(mi.IsGenericMethod ? mi.GetGenericArguments() : Array.Empty<Type>())));
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}
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}
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public static MethodInfo SingleWithoutPredicate { get; }
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public static MethodInfo SingleOrDefaultWithoutPredicate { get; }
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}
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}
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