Is there a built-in IEqualityComparer<T> for System.Int32?

Question

We are currently using EqualityComparer<TKey>.Default as the default way to initialize a generic dictionary. However, it crashes on Xamarin.iOS with the following error when the key of a dictionary is type int (but works on many other platforms I have tried):

Attempting to JIT compile method Lucene.Net.Support.LurchTable2<Lucene.Net.Facet.Taxonomy.FacetLabel, Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader/Int32Class>:InternalInsert<Lucene.Net.Support.LurchTable2/Add2Info<Lucene.Net.Facet.Taxonomy.FacetLabel, Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader/Int32Class>> (int,Lucene.Net.Facet.Taxonomy.FacetLabel,int&,Lucene.Net.Support.LurchTable/Add2Info<Lucene.Net.Facet.Taxonomy.FacetLabel, Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader/Int32Class>) while running in aot-only mode. See https://developer.xamarin.com/guides/ios/advanced_topics/limitations/ for more information.

at Lucene.Net.Support.LurchTable2[TKey,TValue].Insert[T] (TKey key, T& value) <0x2570f48 + 0x000e0> in <063e095c95d945a4ace32ab83d1227eb#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at (wrapper unknown) System.Object.gsharedvt_in() at Lucene.Net.Support.LurchTable2[TKey,TValue].AddOrUpdate (TKey key, TValue addValue, Lucene.Net.Support.KeyValueUpdate2[TKey,TValue] fnUpdate) <0x232824c + 0x0013b> in <063e095c95d945a4ace32ab83d1227eb#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Lucene.Net.Facet.Taxonomy.LRUHashMap2[TKey,TValue].Put (TKey key, TValue value) <0x2c487f8 + 0x0015b> in <79d3a7b905954d0993025c09c5d087ce#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader.GetOrdinal (Lucene.Net.Facet.Taxonomy.FacetLabel cp) <0x2c51970 + 0x0019b> in <79d3a7b905954d0993025c09c5d087ce#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Lucene.Net.Facet.Taxonomy.Int32TaxonomyFacets.GetTopChildren (System.Int32 topN, System.String dim, System.String[] path) <0x2c481dc + 0x0008f> i n <79d3a7b905954d0993025c09c5d087ce#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Login.MyMB.Lucene.Client.LuceneArticoliSearcher.GetListaArticoloXRicercaAvanzataConRicercaSemplice (System.Collections.Generic.List1[T] listParametri) <0x224add0 + 0x001bb> in <8f49891e0f0546e185aba7424d294ef7#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Login.MyMB.Lucene.Client.LuceneArticoliSearcher.GetListaArticoloConRicercaSemplice (System.Collections.Generic.List1[T] listParametri) <0x224afbc + 0x0009f> in <8f49891e0f0546e185aba7424d294ef7#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at MyMB.Forms.RicercaLucene.RicercaArticoloLucene.GetListaArticoliXRicercaSemplice (Login.MyMB.Interface.IAmbiente ambiente, Login.MyMB.Lucene.Client.LuceneArticoliSearcher las, System.Collections.Generic.List`1[T] ListParametri, System.Boolean isAbilitataRicercaBarcode) <0xe47fc0 + 0x000e7> in :0 ...............................

At the link https://docs.microsoft.com/it-it/xamarin/ios/internals/limitations , I found the problem cause (I suppose...):

Value types as Dictionary Keys Using a value type as a Dictionary<TKey, TValue> key is problematic, as the default Dictionary constructor attempts to use EqualityComparer<TKey>.Default . EqualityComparer<TKey>.Default , in turn, attempts to use Reflection to instantiate a new type which implements the IEqualityComparer<TKey> interface. This works for reference types (as the reflection+create a new type step is skipped), but for value types it crashes and burns rather quickly once you attempt to use it on the device. Workaround: Manually implement the IEqualityComparer<TKey> interface in a new type and provide an instance of that type to the Dictionary<TKey, TValue> ( IEqualityComparer<TKey> ) constructor.

Question

Is there a built-in cross-platform way to create a default IEqualityComparer<int> ? I am trying to avoid making a class like this

private class Int32EqualityComparer : IEqualityComparer<int>
{
    bool IEqualityComparer<int>.Equals(int x, int y)
    {
        return x.Equals(y);
    }

    int IEqualityComparer<int>.GetHashCode(int obj)
    {
        return obj.GetHashCode();
    }
} 

just for the sake of getting around this error.

Answer 1

There is no implementation of IEqualityComparer<int> in .NET Standard as you can determine by searching the API reference .

If you intend to implement the IEqualityComparer<T> yourself, it might be worth making a generic implementation with T constrained to IEquatable<T> so that you cover multitude of types instead of just int . All value types are recommended to implement IEquatable<T> as per Framework design guidelines .

Answer 2

看起来不像它， IEqualityComparer<T>的.NET Standard 2.0文档中的派生类型列表没有为整数列出任何内容。