JArray.包含问题 [英] JArray.Contains issue

问题描述

我有一个JArray，从文件中读取:

I have a JArray, read from a file :

private void RemoveCatalog(Catalog catalog) {

    System.IO.StreamReader filereader = new System.IO.StreamReader(@appDirectory + "\\list");

    JArray myjarray = JArray.Parse(filereader.ReadToEnd());
    filereader.Close(); 

    string json = " {\"token\":\"" + catalog.Token + "\",\"name\":\"" + catalog.Name +"\",\"logo\":\"" + catalog.Logo + "\",\"theme\":\"" + catalog.Theme + "\"}";

    JObject myCatalogAsJObject = JObject.Parse(json);

    myjarray.Remove(myCatalogAsJObject);

}

我想删除与myCatalogAsJObject变量相对应的JObject，但是它不起作用，因为myjarray.Contains(myCatalogAsJObject)的答案为假.

I want to remove the JObject corresponding to myCatalogAsJObject variable, but it doesn't work, because the answer of myjarray.Contains(myCatalogAsJObject) is false.

问题是myjarray实际上包含它:它是我的JArray中唯一的JObject.

The problem is that myjarray actually contains it : it's the only JObject in my JArray.

如果我执行myCatalogAsJObject.ToString().Equals(myjarray.First.ToString())，答案是正确的.

If I do myCatalogAsJObject.ToString().Equals(myjarray.First.ToString()), the answer is true however.

我被困住了.

推荐答案

.Contains(和.Remove)默认情况下将比较引用.由于您正在创建 new JObject，因此该数组不包含该 instance .

.Contains (and .Remove) by default will compare references. Since you're creating a new JObject, the array does not contain that instance.

您可以从数组中获取对象的实例，然后删除那个:

You could get the instance of the object from the array and remove that:

JObject match = myjarray.FirstOrDefault(j => j.token == catalog.token &&
                                             j.name  == catalog.name  &&
                                             j.logo  == catalog.logo  &&
                                             j.theme == catalog.theme);

myjarray.Remove(match);

这是您的代码，简化了:

EDIT : Here is your code, simplified :

JToken match = myjarray.FirstOrDefault(j => j.ToString().Equals(myCatalogAsJObject.ToString()));

myjarray.Remove(match);

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