Question

我有这个C＃方法是asp.net webapi：

public IHttpActionResult Definitions()
        {
            var words = db.Words
                .Where(w => w.Name == "abandon")
                .AsNoTracking()
                .ToList();

            foreach (var word in words)
            {
                HttpResponse<string> response = Unirest.get("https://wordsapiv1.p.mashape.com/words/" + word.Name)
                    .header("X-Mashape-Key", "xxx")
                    .header("Accept", "application/json")
                    .asJson<string>();
                RootObject rootObject = JsonConvert.DeserializeObject<RootObject>(response.Body);
                var results = rootObject.results;
                foreach (var result in results)
                {
                    if (!(from d in db.WordDefinitions where d.Definition == result.definition select d).Any())
                    {
                        var pos = 0;
                        switch (result.partOfSpeech)
                        {
                            case "noun":
                                pos = 1;
                                break;
                            case "verb":
                                pos = 2;
                                break;
                            case "adjective":
                                pos = 3;
                                break;
                            case "Adverb":
                                pos = 4;
                                break;
                            default:
                                pos = 5;
                                break;
                        }
                        var definition = new WordDefinition()
                        {
                            WordId = word.WordId,
                            Definition = result.definition,
                            PosId = pos
                        };
                        db.WordDefinitions.Add(definition);
                    }
                    db.SaveChanges();
                } 
            }
            return Ok();
        }

代码从头到尾运行。当我在db.SaveChanges（）上放置一个断点时，我看到它多次到达那个点，我看到这个定义被填充了。

但是当我检查数据库时，没有添加任何内容。

有没有办法可以添加一些可能会让我知道出错的检查？我怀疑有一个异常，但我认为不是因为代码一直运行到方法结束。

Answer 1

在将完整列表添加到WordDefinitions之后尝试执行db.SaveChanges。我的意思是在foreach的外部范围之后..更好的是在范围之外有那行代码，因为每次它都会命中db并保存与这样做相比，你的数据相对需要更多的时间......

代码：

    public IHttpActionResult Definitions()
    {
        var words = db.Words
            .Where(w => w.Name == "abandon")
            .AsNoTracking()
            .ToList();

        foreach (var word in words)
        {
            HttpResponse<string> response = Unirest.get("https://wordsapiv1.p.mashape.com/words/" + word.Name)
                .header("X-Mashape-Key", "xxx")
                .header("Accept", "application/json")
                .asJson<string>();
            RootObject rootObject = JsonConvert.DeserializeObject<RootObject>(response.Body);
            var results = rootObject.results;
            foreach (var result in results)
            {
                if (!(from d in db.WordDefinitions where d.Definition == result.definition select d).Any())
                {
                    var pos = 0;
                    switch (result.partOfSpeech)
                    {
                        case "noun":
                            pos = 1;
                            break;
                        case "verb":
                            pos = 2;
                            break;
                        case "adjective":
                            pos = 3;
                            break;
                        case "Adverb":
                            pos = 4;
                            break;
                        default:
                            pos = 5;
                            break;
                    }
                    var definition = new WordDefinition()
                    {
                        WordId = word.WordId,
                        Definition = result.definition,
                        PosId = pos
                    };
                    db.WordDefinitions.Add(definition);
                }

            } 
        }
        db.SaveChanges();
        return Ok();
    }

EF Add似乎没有添加任何东西？

1 个答案: