Expression0.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Dynamic.Utils;
 
namespace System.Linq.Expressions;
 
internal sealed class Expression0<TDelegate> : Expression<TDelegate>
{
    internal override int ParameterCount => 0;
 
    public Expression0(Expression body)
        : base(body)
    {
    }
 
    internal override bool SameParameters(ICollection<ParameterExpression> parameters)
    {
        if (parameters != null)
        {
            return parameters.Count == 0;
        }
        return true;
    }
 
    internal override ParameterExpression GetParameter(int index)
    {
        throw Error.ArgumentOutOfRange("index");
    }
 
    internal override ReadOnlyCollection<ParameterExpression> GetOrMakeParameters()
    {
        return EmptyReadOnlyCollection<ParameterExpression>.Instance;
    }
 
    internal override Expression<TDelegate> Rewrite(Expression body, ParameterExpression[] parameters)
    {
        return Expression.Lambda<TDelegate>(body, parameters);
    }
}