/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual Expression Translate(MethodCallExpression methodCallExpression)
{
Check.NotNull(methodCallExpression, nameof(methodCallExpression));
if ((methodCallExpression.Method.Name == nameof(object.Equals)) &&
(methodCallExpression.Arguments.Count == 1) &&
(methodCallExpression.Object != null))
{
var argument = methodCallExpression.Arguments[0];
if ((methodCallExpression.Method.GetParameters()[0].ParameterType == typeof(object)) &&
(methodCallExpression.Object.Type != argument.Type))
{
argument = argument.RemoveConvert();
var unwrappedObjectType = methodCallExpression.Object.Type.UnwrapNullableType();
var unwrappedArgumentType = argument.Type.UnwrapNullableType();
if (unwrappedObjectType == unwrappedArgumentType)
{
return(Expression.Equal(
Expression.Convert(methodCallExpression.Object, unwrappedObjectType),
Expression.Convert(argument, unwrappedArgumentType)));
}
_logger.LogWarning(
RelationalEventId.PossibleUnintendedUseOfEqualsWarning,
() => RelationalStrings.PossibleUnintendedUseOfEquals(
methodCallExpression.Object.ToString(),
argument.ToString()));
// Equals(object) always returns false if when comparing objects of different types
return(Expression.Constant(false));
}
return(Expression.Equal(methodCallExpression.Object, argument));
}
return(null);
}
protected virtual void LogWarning()
{
_logger.LogWarning(
InMemoryEventId.TransactionIgnoredWarning,
() => InMemoryStrings.TransactionsNotSupported);
}
