C#•17mo ago

❔ JObject find value

I have the following JSON

{
    "sale": {
        "id": "x",
        "transaction": {
            "id": "y",
            "state": "Completed"
        }
    }
}

{
    "sale": {
        "id": "x",
        "transaction": {
            "id": "y",
            "state": "Completed"
        }
    }
}

I want to check if sale.transaction.state == "Completed" But since the keys sale, transaction and state are optional and not always in the response, I must check for their presence. Is there a better way than what I have below?

var responseObject = JObject.Parse(responseString);
if (responseObject["sale"] != null && responseObject["sale"]["transaction"] != null && responseObject["sale"]["transaction"]["state"] != null)
{
    if (responseObject.Value<string>("sale.transaction.state") == "Completed")
    {
        Console.WriteLine("Yes");
    }
}

var responseObject = JObject.Parse(responseString);
if (responseObject["sale"] != null && responseObject["sale"]["transaction"] != null && responseObject["sale"]["transaction"]["state"] != null)
{
    if (responseObject.Value<string>("sale.transaction.state") == "Completed")
    {
        Console.WriteLine("Yes");
    }
}

5 Replies

canton7•17mo ago

You can use ? with []: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/member-access-operators#null-conditional-operators--and- So, if (responseObject["sale"]?["transaction"]?["state"] ...) or so?

Member access and null-conditional operators and expressions:

C# operators that you use to access type members or null-conditionally access type members. These operators include the dot operator - ., indexers - [, ], ^ and .., and invocation - (, ).

Anton•17mo ago

Like this ig?

var sale = responseObject["sale"];
if (sale is null)
    return false;

var transaction = sale["transaction"];
if (transaction is null)
    return false;

var state = transaction["state"];
if (state is null)
    return false;

if (state.Value<string>() == "Completed")
    return true;

return false;

var sale = responseObject["sale"];
if (sale is null)
    return false;

var transaction = sale["transaction"];
if (transaction is null)
    return false;

var state = transaction["state"];
if (state is null)
    return false;

if (state.Value<string>() == "Completed")
    return true;

return false;

easier to debug

canton7•17mo ago

Why not just responseObject["sale"]?["transaction"]?["state"]?.Value<string>() == "Completed"?

Eple•17mo ago

These are the kind of answers that I come to this channel for. Smart and brilliant ones.

Accord•17mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ JObject find value