CODEWITHSUNDEEP
c#jsonvb.netjson.net
StealthRT
StealthRT

Reputation: 10552

JObject.Parse key/value with json.net in C#

Hey all I have the following code:

try {
  foreach (var x1 in JObject.Parse(json1)) {
     string name = x1.Key;
     JToken value = x1.Value;

There are no visible errors with the above code. However, once I run the application and it gets to that point it errors and says:

'Newtonsoft.Json.Linq.JProperty' does not contain a definition for 'Key'

So whats going on here. My VB.net code works like the above:

Try
    For Each x1 In JObject.Parse(json1)
       Dim name As String = x1.Key
       Dim value As JToken = x1.Value

Upvotes: 1

Views: 2037

Answers (1)

Domysee
Domysee

Reputation: 12854

JProperty (you get JPropertys by iterating over a JObject) inherits from JContainer, which inherits from JToken. JToken implements IDynamicMetaObjectProvider.

This makes it essentially a dynamic object, which allows you to access anything on it at compile time. That's why you dont get a compiler error.

At runtime the DLR discovers that there is no Key property on x1 and throws that exception.

If you want to get the property name, you should use the Name property.

foreach (var x1 in JObject.Parse(json1)) {
    string name = x1.Name;
    JToken value = x1.Value;

Upvotes: 1

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