private static bool IsNonNullReturnMethodCall(Expression memberAccess)
{
if (memberAccess.NodeType != Call)
{
return(false);
}
var method = ((MethodCallExpression)memberAccess).Method;
switch (method.Name)
{
case "ToString" when method.DeclaringType == typeof(object):
case "Split" when method.DeclaringType == typeof(string):
case "GetEnumerator" when method.DeclaringType.IsClosedTypeOf(typeof(IEnumerable <>)):
return(true);
case "Select":
case "SelectMany":
case "Project":
case "Filter":
case "Where":
case "OrderBy":
case "OrderByDescending":
case "ToList":
case "ToArray":
return((method.DeclaringType == typeof(Enumerable)) ||
(method.DeclaringType == typeof(PublicEnumerableExtensions)));
default:
return(false);
}
}
private static bool IsNonNullReturnMethodCall(Expression memberAccess)
{
if (memberAccess.NodeType != Call)
{
return(false);
}
var method = ((MethodCallExpression)memberAccess).Method;
switch (method.Name)
{
case nameof(string.ToString) when method.DeclaringType == typeof(object):
case nameof(string.Split) when method.DeclaringType == typeof(string):
case nameof(IEnumerable <int> .GetEnumerator) when method.DeclaringType.IsClosedTypeOf(typeof(IEnumerable <>)):
return(true);
case nameof(Enumerable.Select):
case nameof(Enumerable.SelectMany):
case nameof(PublicEnumerableExtensions.Project):
case nameof(PublicEnumerableExtensions.Filter):
case nameof(Enumerable.Where):
case nameof(Enumerable.OrderBy):
case nameof(Enumerable.OrderByDescending):
case nameof(Enumerable.ToList):
case nameof(Enumerable.ToArray):
return((method.DeclaringType == typeof(Enumerable)) ||
(method.DeclaringType == typeof(PublicEnumerableExtensions)));
default:
return(false);
}
}