确定属性的值是数组

我有一个JSON文件：

{ "abn":"63119059513", "acn":"119059513", "business_structure":"Private Company", "ngr_number":"1231231", "cbh_number":"1231231", "main_name":"Brickworks Building Products Pty Ltd", "trading_name":"Brickworks", "other_trading_names":"Austral Bricks", "directors":[ { "ID":"12114", "ae_forms_filled_in_ID":"22739", "name":"John Smith", "dob":"1983-10-29", "address_line_1":"123 Fake Street", "address_line_2":"", "address_line_city":"Fakeland", "address_line_postcode":"2000", "address_line_state":"New South Wales", "address_line_country":"Australia", "order_extract_id":null, "director_found":null, "drivers_lic":"", "home_mortgage":"", "phone":"", "mobile":"", "director_email":"", "director_title":"Mr", "director_position":"Director", "dir_pdf_url":null } ], } 

我想确定任何属性的值是否具有数组结构。 到目前为止，我能想出的最好的是：

 StreamReader streamrr = new StreamReader("C:\\temp\\agfarm_example_udate.json", Encoding.UTF8); string JSON = streamrr.ReadToEnd(); JObject CWFile = JObject.Parse(JSON); foreach (JProperty property in CWFile.Properties()) { // Do something if (property.Value.ToString().Contains("[")) { // Do something with the array JArray items = (JArray)CWFile[property.Name]; foreach (JObject o in items.Children()) { foreach (JProperty p in o.Properties()) { // Do something } } } } 

为了确定属性值是否有数组，我使用了以下条件：

 if (property.Value.ToString().Contains("[")) 

我只是想知道是否有更好的方法来做这个检查？

Answer 1

一种方法是检查JToken.Type属性。 数组的类型为JTokenType.Array ：

 if (property.Value.Type == JTokenType.Array) { var items = (JArray)property.Value; // Proceed as before. } 

或者，您可以尝试转换为JArray ：

 if (property.Value is JArray) { var items = (JArray)property.Value; // Proceed as before. } 

两者都优于检查property.Value.ToString().Contains("[")因为嵌套属性可能具有数组值，从而导致括号出现在ToString()返回的某处。

如果要以递归方式查找具有数组值的每个属性，可以引入扩展方法：

 public static class JsonExtensions { public static IEnumerable WalkTokens(this JToken node) { if (node == null) yield break; yield return node; foreach (var child in node.Children()) foreach (var childNode in child.WalkTokens()) yield return childNode; } } 

然后做：

 var CWFile = JToken.Parse(JSON) var arrayProperties = CWFile.WalkTokens().OfType().Where(prop => prop.Value.Type == JTokenType.Array); 

Answer 2

  public void Traverse(string name, JToken j) { foreach (JToken token in j.AsJEnumerable()) if (token.Type == JTokenType.Object) { foreach (var pair in token as JObject) { string name_ = pair.Key; JToken child = pair.Value; Traverse(name, child); } } else if (token.Type == JTokenType.Array) //an array property found { foreach (var child in token.Children()) Traverse(((JProperty)j).Name, child); } else if (token.Type == JTokenType.Property) { var property = token as JProperty; //current level property Traverse(name, (JContainer)token); } else //current level property name & value { var nm = ""; var t = ""; if (j is JProperty) { nm = ((JProperty)j).Name; t = Convert.ToString(((JProperty)j).Value); } t = Convert.ToString(token); } } 

呼叫：

 JSON = JObject.Parse(...); Traverse("", JSON); 

解析和已解析的文本出于同样的原因并不是很明智：

if（property.Value.ToString（）。包含（“[”））

Json结构很简单：对象，数组，属性，值

http://www.json.org/

所以数组是json的一个众所周知的对象，我们正在寻找它：

if（token.Type == JTokenType.Array）//数组属性