MethodCallExpression1.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Dynamic.Utils;
using System.Reflection;
 
namespace System.Linq.Expressions;
 
internal sealed class MethodCallExpression1 : MethodCallExpression, IArgumentProvider
{
    private object _arg0;
 
    public override int ArgumentCount => 1;
 
    public MethodCallExpression1(MethodInfo method, Expression arg0)
        : base(method)
    {
        _arg0 = arg0;
    }
 
    public override Expression GetArgument(int index)
    {
        if (index == 0)
        {
            return ExpressionUtils.ReturnObject<Expression>(_arg0);
        }
        throw new ArgumentOutOfRangeException("index");
    }
 
    internal override ReadOnlyCollection<Expression> GetOrMakeArguments()
    {
        return ExpressionUtils.ReturnReadOnly(this, ref _arg0);
    }
 
    internal override bool SameArguments(ICollection<Expression> arguments)
    {
        if (arguments != null && arguments.Count == 1)
        {
            using (IEnumerator<Expression> enumerator = arguments.GetEnumerator())
            {
                enumerator.MoveNext();
                return enumerator.Current == ExpressionUtils.ReturnObject<Expression>(_arg0);
            }
        }
        return false;
    }
 
    internal override MethodCallExpression Rewrite(Expression instance, IReadOnlyList<Expression> args)
    {
        if (args != null)
        {
            return Expression.Call(base.Method, args[0]);
        }
        return Expression.Call(base.Method, ExpressionUtils.ReturnObject<Expression>(_arg0));
    }
}