ParameterList.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System.Linq.Expressions.Compiler;
 
internal sealed class ParameterList : IReadOnlyList<ParameterExpression>, IEnumerable<ParameterExpression>, IEnumerable, IReadOnlyCollection<ParameterExpression>
{
    private readonly IParameterProvider _provider;
 
    public ParameterExpression this[int index] => _provider.GetParameter(index);
 
    public int Count => _provider.ParameterCount;
 
    public ParameterList(IParameterProvider provider)
    {
        _provider = provider;
    }
 
    public IEnumerator<ParameterExpression> GetEnumerator()
    {
        int i = 0;
        for (int j = _provider.ParameterCount; i < j; i++)
        {
            yield return _provider.GetParameter(i);
        }
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}