static EnumerableMethods()
{
#region Enumerable
var enumerableMethods = typeof(Enumerable)
.GetMethods(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly).ToList();
MethodInfo anyWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.Any) && mi.GetParameters().Length == 1);
MethodInfo firstWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.First) && mi.GetParameters().Length == 1);
MethodInfo firstOrDefaultWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.FirstOrDefault) && mi.GetParameters().Length == 1);
MethodInfo singleWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.Single) && mi.GetParameters().Length == 1);
MethodInfo singleOrDefaultWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.SingleOrDefault) && mi.GetParameters().Length == 1);
MethodInfo lastWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.Last) && mi.GetParameters().Length == 1);
MethodInfo lastOrDefaultWithoutPredicate = enumerableMethods.Single(
mi => mi.Name == nameof(Enumerable.LastOrDefault) && mi.GetParameters().Length == 1);
MethodInfo select = enumerableMethods.First(mi =>
mi.Name == nameof(Queryable.Select) && mi.GetParameters().Length == 2);
QueryableToEnumerableMethods = new Dictionary <MethodInfo, MethodInfo>
{
{ QueryableMethods.AnyWithoutPredicate, anyWithoutPredicate },
{ QueryableMethods.FirstWithoutPredicate, firstWithoutPredicate },
{ QueryableMethods.FirstOrDefaultWithoutPredicate, firstOrDefaultWithoutPredicate },
{ QueryableMethods.SingleWithoutPredicate, singleWithoutPredicate },
{ QueryableMethods.SingleOrDefaultWithoutPredicate, singleOrDefaultWithoutPredicate },
{ QueryableMethods.LastWithoutPredicate, lastWithoutPredicate },
{ QueryableMethods.LastOrDefaultWithoutPredicate, lastOrDefaultWithoutPredicate },
{ QueryableMethods.Select, select }
};
#endregion
#region Sum/Average
void AddSumOrAverage <T>(string methodName)
{
MethodInfo queryableMethod = methodName == nameof(Enumerable.Sum)
? QueryableMethods.GetSumWithoutSelector(typeof(T))
: QueryableMethods.GetAverageWithoutSelector(typeof(T));
MethodInfo enumerableMethod = enumerableMethods.GetSumOrAverageWithoutSelector <T>(methodName);
QueryableToEnumerableMethods.Add(queryableMethod, enumerableMethod);
}
AddSumOrAverage <decimal>(nameof(Enumerable.Sum));
AddSumOrAverage <long>(nameof(Enumerable.Sum));
AddSumOrAverage <int>(nameof(Enumerable.Sum));
AddSumOrAverage <double>(nameof(Enumerable.Sum));
AddSumOrAverage <float>(nameof(Enumerable.Sum));
AddSumOrAverage <decimal?>(nameof(Enumerable.Sum));
AddSumOrAverage <long?>(nameof(Enumerable.Sum));
AddSumOrAverage <int?>(nameof(Enumerable.Sum));
AddSumOrAverage <double?>(nameof(Enumerable.Sum));
AddSumOrAverage <float?>(nameof(Enumerable.Sum));
AddSumOrAverage <decimal>(nameof(Enumerable.Average));
AddSumOrAverage <long>(nameof(Enumerable.Average));
AddSumOrAverage <int>(nameof(Enumerable.Average));
AddSumOrAverage <double>(nameof(Enumerable.Average));
AddSumOrAverage <float>(nameof(Enumerable.Average));
AddSumOrAverage <decimal?>(nameof(Enumerable.Average));
AddSumOrAverage <long?>(nameof(Enumerable.Average));
AddSumOrAverage <int?>(nameof(Enumerable.Average));
AddSumOrAverage <double?>(nameof(Enumerable.Average));
AddSumOrAverage <float?>(nameof(Enumerable.Average));
#endregion
#region Min/Max
MinWithoutSelectorMethods = new Dictionary <Type, MethodInfo>
{
{ typeof(decimal), enumerableMethods.GetMinOrMaxWithoutSelector <decimal>(nameof(Enumerable.Min)) },
{ typeof(long), enumerableMethods.GetMinOrMaxWithoutSelector <long>(nameof(Enumerable.Min)) },
{ typeof(int), enumerableMethods.GetMinOrMaxWithoutSelector <int>(nameof(Enumerable.Min)) },
{ typeof(double), enumerableMethods.GetMinOrMaxWithoutSelector <double>(nameof(Enumerable.Min)) },
{ typeof(float), enumerableMethods.GetMinOrMaxWithoutSelector <float>(nameof(Enumerable.Min)) },
{ typeof(decimal?), enumerableMethods.GetMinOrMaxWithoutSelector <decimal?>(nameof(Enumerable.Min)) },
{ typeof(long?), enumerableMethods.GetMinOrMaxWithoutSelector <long?>(nameof(Enumerable.Min)) },
{ typeof(int?), enumerableMethods.GetMinOrMaxWithoutSelector <int?>(nameof(Enumerable.Min)) },
{ typeof(double?), enumerableMethods.GetMinOrMaxWithoutSelector <double?>(nameof(Enumerable.Min)) },
{ typeof(float?), enumerableMethods.GetMinOrMaxWithoutSelector <float?>(nameof(Enumerable.Min)) }
};
MaxWithoutSelectorMethods = new Dictionary <Type, MethodInfo>
{
{ typeof(decimal), enumerableMethods.GetMinOrMaxWithoutSelector <decimal>(nameof(Enumerable.Max)) },
{ typeof(long), enumerableMethods.GetMinOrMaxWithoutSelector <long>(nameof(Enumerable.Max)) },
{ typeof(int), enumerableMethods.GetMinOrMaxWithoutSelector <int>(nameof(Enumerable.Max)) },
{ typeof(double), enumerableMethods.GetMinOrMaxWithoutSelector <double>(nameof(Enumerable.Max)) },
{ typeof(float), enumerableMethods.GetMinOrMaxWithoutSelector <float>(nameof(Enumerable.Max)) },
{ typeof(decimal?), enumerableMethods.GetMinOrMaxWithoutSelector <decimal?>(nameof(Enumerable.Max)) },
{ typeof(long?), enumerableMethods.GetMinOrMaxWithoutSelector <long?>(nameof(Enumerable.Max)) },
{ typeof(int?), enumerableMethods.GetMinOrMaxWithoutSelector <int?>(nameof(Enumerable.Max)) },
{ typeof(double?), enumerableMethods.GetMinOrMaxWithoutSelector <double?>(nameof(Enumerable.Max)) },
{ typeof(float?), enumerableMethods.GetMinOrMaxWithoutSelector <float?>(nameof(Enumerable.Max)) }
};
#endregion
}