blocks|key|232180|text|您可以使用此处提供的JSONConverterAttribute：http://james.newtonking.com/projects/json/help/|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|232181|假设您有一个类，如下所示|232182|public+class+RootObject
{
++++public+string+email+{+get;+set;+}
++++public+int+timestamp+{+get;+set;+}
++++public+string+smtpid+{+get;+set;+}
++++public+string+@event+{+get;+set;+}
++++public+string+category[]+{+get;+set;+}
}|code-block|syntax|javascript|232183|您将装饰类别属性，如下所示：|232184|++++[JsonConverter(typeof(SendGridCategoryConverter))]
++++public+string+category+{+get;+set;+}

public+class+SendGridCategoryConverter+:+JsonConverter
{
++public+override+bool+CanConvert(Type+objectType)
++{
++++return+true;+//+add+your+own+logic
++}

++public+override+object+ReadJson(JsonReader+reader,+Type+objectType,+object+existingValue,+JsonSerializer+serializer)
++{
+++//+do+work+here+to+handle+returning+the+array+regardless+of+the+number+of+objects+in+
++}

++public+override+void+WriteJson(JsonWriter+writer,+object+value,+JsonSerializer+serializer)
++{
++++//+Left+as+an+exercise+to+the+reader+:)
++++throw+new+NotImplementedException();
++}
}|232185|entityMap|0|LINK|mutability|MUTABLE|url|http://james.newtonking.com/projects/json/help/^0|A|M|X|1B|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|16|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

You can use a <code>JSONConverterAttribute</code> as found here: <a href="http://james.newtonking.com/projects/json/help/" rel="nofollow noreferrer">http://james.newtonking.com/projects/json/help/</a>

Presuming you have a class that looks like 

<pre class="lang-cs prettyprint-override"><code>public class RootObject
{
 public string email { get; set; }
 public int timestamp { get; set; }
 public string smtpid { get; set; }
 public string @event { get; set; }
 public string category[] { get; set; }
}
</code></pre>

You'd decorate the category property as seen here:

<pre class="lang-cs prettyprint-override"><code> [JsonConverter(typeof(SendGridCategoryConverter))]
 public string category { get; set; }

public class SendGridCategoryConverter : JsonConverter
{
 public override bool CanConvert(Type objectType)
 {
 return true; // add your own logic
 }

 public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
 {
 // do work here to handle returning the array regardless of the number of objects in 
 }

 public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
 {
 // Left as an exercise to the reader :)
 throw new NotImplementedException();
 }
}
</code></pre>

blocks|key|232214|text|我找到了另一种解决方案，可以通过使用object将类别处理为字符串或数组。这样我就不需要搞乱json序列化程序了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|232215|如果你有时间，请看一看，并告诉我你的想法。https://github.com/MarcelloCarreira/sendgrid-csharp-eventwebhook|offset|length|232216|它基于https://sendgrid.com/blog/tracking-email-using-azure-sendgrid-event-webhook-part-1/的解决方案，但我还添加了来自时间戳的日期转换，升级了变量以反映当前的SendGrid模型(并使分类有效)。|232217|我还创建了一个使用basic+auth作为选项的处理程序。请参阅ashx文件和示例。|232218|谢谢!|232219|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/MarcelloCarreira/sendgrid-csharp-eventwebhook|1|https://sendgrid.com/blog/tracking-email-using-azure-sendgrid-event-webhook-part-1/^0|0|L|1S|0|0|3|2B|1|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

I found another solution that can handle the category as string or array by using object. This way I don´t need to mess up with the json serializer.

Please give it a look if you have the time and tell me what you think. <a href="https://github.com/MarcelloCarreira/sendgrid-csharp-eventwebhook" rel="nofollow">https://github.com/MarcelloCarreira/sendgrid-csharp-eventwebhook</a>

It´s based on the solution at <a href="https://sendgrid.com/blog/tracking-email-using-azure-sendgrid-event-webhook-part-1/" rel="nofollow">https://sendgrid.com/blog/tracking-email-using-azure-sendgrid-event-webhook-part-1/</a> but I also added date conversion from timestamp, upgraded the variables to reflect current SendGrid model (and made categories work).

I also created a handler with basic auth as option. See the ashx files and the examples.

Thank you!

blocks|key|15915|text|我为此工作了很长时间，感谢Brian的回答。我要添加的是vb.net答案！：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|15916|Public+Class+SingleValueArrayConverter(Of+T)
sometimes-array-and-sometimes-object
++++Inherits+JsonConverter
++++Public+Overrides+Sub+WriteJson(writer+As+JsonWriter,+value+As+Object,+serializer+As+JsonSerializer)
++++++++Throw+New+NotImplementedException()
++++End+Sub

++++Public+Overrides+Function+ReadJson(reader+As+JsonReader,+objectType+As+Type,+existingValue+As+Object,+serializer+As+JsonSerializer)+As+Object
++++++++Dim+retVal+As+Object+=+New+[Object]()
++++++++If+reader.TokenType+=+JsonToken.StartObject+Then
++++++++++++Dim+instance+As+T+=+DirectCast(serializer.Deserialize(reader,+GetType(T)),+T)
++++++++++++retVal+=+New+List(Of+T)()+From+{+_
++++++++++++++++instance+_
++++++++++++}
++++++++ElseIf+reader.TokenType+=+JsonToken.StartArray+Then
++++++++++++retVal+=+serializer.Deserialize(reader,+objectType)
++++++++End+If
++++++++Return+retVal
++++End+Function
++++Public+Overrides+Function+CanConvert(objectType+As+Type)+As+Boolean
++++++++Return+False
++++End+Function
End+Class|code-block|syntax|javascript|15917|然后在你的班上：|15918|+<JsonProperty(PropertyName:="JsonName)>+_
+<JsonConverter(GetType(SingleValueArrayConverter(Of+YourObject)))>+_
++++Public+Property+YourLocalName+As+List(Of+YourObject)|15919|希望这能节省你的时间|15920|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I was working on this for ages, and thanks to Brian for his answer.
All I am adding is the vb.net answer!:

<pre class="lang-vbnet prettyprint-override"><code>Public Class SingleValueArrayConverter(Of T)
sometimes-array-and-sometimes-object
 Inherits JsonConverter
 Public Overrides Sub WriteJson(writer As JsonWriter, value As Object, serializer As JsonSerializer)
 Throw New NotImplementedException()
 End Sub

 Public Overrides Function ReadJson(reader As JsonReader, objectType As Type, existingValue As Object, serializer As JsonSerializer) As Object
 Dim retVal As Object = New [Object]()
 If reader.TokenType = JsonToken.StartObject Then
 Dim instance As T = DirectCast(serializer.Deserialize(reader, GetType(T)), T)
 retVal = New List(Of T)() From { _
 instance _
 }
 ElseIf reader.TokenType = JsonToken.StartArray Then
 retVal = serializer.Deserialize(reader, objectType)
 End If
 Return retVal
 End Function
 Public Overrides Function CanConvert(objectType As Type) As Boolean
 Return False
 End Function
End Class
</code></pre>

then in your class:

<pre class="lang-vbnet prettyprint-override"><code> &lt;JsonProperty(PropertyName:="JsonName)&gt; _
 &lt;JsonConverter(GetType(SingleValueArrayConverter(Of YourObject)))&gt; _
 Public Property YourLocalName As List(Of YourObject)
</code></pre>

Hope this saves you some time

blocks|key|232263|text|我只是想在上面的SingleOrArrayCollectionConverter上给@dbc添加一个很好的回应。我能够将其修改为与来自HTTP客户端的流一起使用。下面是一个代码片段(您必须设置requestUrl+(字符串)和httpClient+(使用System.Net.Http;)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|232264|public+async+Task<IList<T>>+HttpRequest<T>(HttpClient+httpClient,+string+requestedUrl,+CancellationToken+cancellationToken)
++++{
+++++++using+(var+request+=+new+HttpRequestMessage(HttpMethod.Get,+requestedUrl))
+++++++using+(var+httpResponseMessage+=+await+httpClient.SendAsync(request,+HttpCompletionOption.ResponseHeadersRead,+cancellationToken))
+++++++{
++++++++++if+(httpResponseMessage.IsSuccessStatusCode)
++++++++++{
+++++++++++++using+var+stream+=+await+httpResponseMessage.Content.ReadAsStreamAsync();++++
+++++++++++++using+var+streamReader+=+new+StreamReader(stream);
+++++++++++++using+var+jsonTextReader+=+new+JsonTextReader(streamReader+);
+++++++++++++var+settings+=+new+JsonSerializerSettings
+++++++++++++{
++++++++++++++++//+Pass+true+if+you+want+single-item+lists+to+be+reserialized+as+single+items
++++++++++++++++Converters+=+{+new+SingleOrArrayCollectionConverter(true)+},
+++++++++++++};
+++++++++++++var+jsonSerializer+=+JsonSerializer.Create(settings);
+++++++++++++return+jsonSerializer.Deserialize<List<T>>(jsonTextReader);
+++++}|code-block|syntax|javascript|232265|如果有丢失的括号或拼写错误，我很抱歉，在这里粘贴代码并不容易。|232266|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/3744182/dbc^0|16|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Just wanted to add to <a href="https://stackoverflow.com/users/3744182/dbc">@dbc</a> excellent response above on the SingleOrArrayCollectionConverter. I was able to modify it to use with a stream from an HTTP client. Here is a snippet (you will have to set up the requestUrl (string) and the httpClient (using System.Net.Http;).
<pre><code>public async Task&lt;IList&lt;T&gt;&gt; HttpRequest&lt;T&gt;(HttpClient httpClient, string requestedUrl, CancellationToken cancellationToken)
 {
 using (var request = new HttpRequestMessage(HttpMethod.Get, requestedUrl))
 using (var httpResponseMessage = await httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken))
 {
 if (httpResponseMessage.IsSuccessStatusCode)
 {
 using var stream = await httpResponseMessage.Content.ReadAsStreamAsync(); 
 using var streamReader = new StreamReader(stream);
 using var jsonTextReader = new JsonTextReader(streamReader );
 var settings = new JsonSerializerSettings
 {
 // Pass true if you want single-item lists to be reserialized as single items
 Converters = { new SingleOrArrayCollectionConverter(true) },
 };
 var jsonSerializer = JsonSerializer.Create(settings);
 return jsonSerializer.Deserialize&lt;List&lt;T&gt;&gt;(jsonTextReader);
 }
</code></pre>
I apologize if there are missing brackets or misspellings, it was not easy to paste code in here.

I'm trying to fix my SendGridPlus library to deal with SendGrid events, but I'm having some trouble with the inconsistent treatment of categories in the API. 

In the following example payload taken from the <a href="http://sendgrid.com/docs/API_Reference/Webhooks/event.html#-Event-POST-Example">SendGrid API reference</a>, you'll notice that the <code>category</code> property for each item can either be a single string or an array of strings.

<pre><code>[
 {
 "email": "john.doe@sendgrid.com",
 "timestamp": 1337966815,
 "category": [
 "newuser",
 "transactional"
 ],
 "event": "open"
 },
 {
 "email": "jane.doe@sendgrid.com",
 "timestamp": 1337966815,
 "category": "olduser",
 "event": "open"
 }
]
</code></pre>

It seems my options to make JSON.NET like this are fixing the string before it comes in, or configuring JSON.NET to accept the incorrect data. I'd rather not do any string parsing if I can get away with it.

Is there any other way I can handle this using Json.Net?

How to handle both a single item and an array for the same property using JSON.net

JSON

我正在尝试修复我的SendGridPlus库来处理SendGrid事件，但我遇到了一些问题，因为在API中对类别的处理不一致。在下面的示例中，您将注意到每个项目的category属性既可以是单个字符串，也可以是字符串数组。[  {    "email": "john.doe@sendgrid.com",    "tim...

问如何使用JSON.net处理同一属性的单个项和数组
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