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Optimize MakeGenericMethod() invocations compile-time known generic types #367

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Mar 18, 2025
Merged

Optimize MakeGenericMethod() invocations compile-time known generic types #367

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23 changes: 14 additions & 9 deletions Orm/Xtensive.Orm/Orm/QueryableExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,12 +4,8 @@
// Created by: Alexey Gamzov
// Created: 2009.05.06

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;
using System.Reflection;
using JetBrains.Annotations;
using Xtensive.Core;
using Xtensive.Orm.Internals;
Expand All @@ -23,6 +19,17 @@ namespace Xtensive.Orm
/// </summary>
public static partial class QueryableExtensions
{
private static class Traits<T>
{
public static readonly MethodInfo ExtensionTagMethodInfo = WellKnownMembers.Queryable.ExtensionTag.MakeGenericMethod([typeof(T)]);
}

private static class Traits<TOuter, TInner, TKey, TResult>
{
public static readonly MethodInfo ExtensionLeftJoinMethodInfo
= WellKnownMembers.Queryable.ExtensionLeftJoin.MakeGenericMethod([typeof (TOuter), typeof(TInner), typeof(TKey), typeof(TResult)]);
}

/// <summary>
/// Tags query with given <paramref name="tag"/> string
/// (inserts string as comment in SQL statement) for
Expand All @@ -43,8 +50,7 @@ public static IQueryable<TSource> Tag<TSource>(this IQueryable<TSource> source,
throw new NotSupportedException(string.Format(errorMessage, providerType));
}

var genericMethod = WellKnownMembers.Queryable.ExtensionTag.MakeGenericMethod(new[] { typeof(TSource) });
var expression = Expression.Call(null, genericMethod, new[] { source.Expression, Expression.Constant(tag)});
var expression = Expression.Call(null, Traits<TSource>.ExtensionTagMethodInfo, new[] { source.Expression, Expression.Constant(tag)});
return source.Provider.CreateQuery<TSource>(expression);
}

Expand Down Expand Up @@ -340,8 +346,7 @@ public static IQueryable<TResult> LeftOuterJoin<TOuter, TInner, TKey, TResult>(t
throw new NotSupportedException(string.Format(errorMessage, outerProviderType));
}

var genericMethod = WellKnownMembers.Queryable.ExtensionLeftJoin.MakeGenericMethod(new[] {typeof (TOuter), typeof(TInner), typeof(TKey), typeof(TResult)});
var expression = Expression.Call(null, genericMethod, new[] {outer.Expression, GetSourceExpression(inner), outerKeySelector, innerKeySelector, resultSelector});
var expression = Expression.Call(null, Traits<TOuter, TInner, TKey, TResult>.ExtensionLeftJoinMethodInfo, new[] {outer.Expression, GetSourceExpression(inner), outerKeySelector, innerKeySelector, resultSelector});
return outer.Provider.CreateQuery<TResult>(expression);
}

Expand Down