InvocationExpression1.cs

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using System.Collections.ObjectModel;
using System.Dynamic.Utils;
 
namespace System.Linq.Expressions;
 
internal sealed class InvocationExpression1 : InvocationExpression
{
    private object _arg0;
 
    public override int ArgumentCount => 1;
 
    public InvocationExpression1(Expression lambda, Type returnType, Expression arg0)
        : base(lambda, returnType)
    {
        _arg0 = arg0;
    }
 
    internal override ReadOnlyCollection<Expression> GetOrMakeArguments()
    {
        return ExpressionUtils.ReturnReadOnly(this, ref _arg0);
    }
 
    public override Expression GetArgument(int index)
    {
        if (index == 0)
        {
            return ExpressionUtils.ReturnObject<Expression>(_arg0);
        }
        throw new ArgumentOutOfRangeException("index");
    }
 
    internal override InvocationExpression Rewrite(Expression lambda, Expression[] arguments)
    {
        if (arguments != null)
        {
            return System.Linq.Expressions.Expression.Invoke(lambda, arguments[0]);
        }
        return System.Linq.Expressions.Expression.Invoke(lambda, ExpressionUtils.ReturnObject<Expression>(_arg0));
    }
}