ExpressionN.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Dynamic.Utils;
 
namespace System.Linq.Expressions;
 
internal class ExpressionN<TDelegate> : Expression<TDelegate>
{
    private IReadOnlyList<ParameterExpression> _parameters;
 
    internal override int ParameterCount => _parameters.Count;
 
    public ExpressionN(Expression body, IReadOnlyList<ParameterExpression> parameters)
        : base(body)
    {
        _parameters = parameters;
    }
 
    internal override ParameterExpression GetParameter(int index)
    {
        return _parameters[index];
    }
 
    internal override bool SameParameters(ICollection<ParameterExpression> parameters)
    {
        return ExpressionUtils.SameElements(parameters, _parameters);
    }
 
    internal override ReadOnlyCollection<ParameterExpression> GetOrMakeParameters()
    {
        return ExpressionUtils.ReturnReadOnly(ref _parameters);
    }
 
    internal override Expression<TDelegate> Rewrite(Expression body, ParameterExpression[] parameters)
    {
        return Expression.Lambda<TDelegate>(body, base.Name, base.TailCall, parameters ?? _parameters);
    }
}