ParameterProviderExtensions.cs

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namespace System.Linq.Expressions.Compiler;
 
internal static class ParameterProviderExtensions
{
    public static int IndexOf(this IParameterProvider provider, ParameterExpression parameter)
    {
        int i = 0;
        for (int parameterCount = provider.ParameterCount; i < parameterCount; i++)
        {
            if (provider.GetParameter(i) == parameter)
            {
                return i;
            }
        }
        return -1;
    }
 
    public static bool Contains(this IParameterProvider provider, ParameterExpression parameter)
    {
        return provider.IndexOf(parameter) >= 0;
    }
}