在 .net core 3 中将 newtonsoft 代码转换为 System.Text.Json.相当于 JObje

问题描述

我正在将我的 newtonsoft 实现转换为 .net core 3.0 中的新 JSON 库.我有以下代码

I am converting my newtonsoft implementation to new JSON library in .net core 3.0. I have the following code

public static bool IsValidJson(string json)
{
    try
    {                
        JObject.Parse(json);
        return true;
    }
    catch (Exception ex)
    {
        Logger.ErrorFormat("Invalid Json Received {0}", json);
        Logger.Fatal(ex.Message);
        return false;
    }
}

我找不到 JObject.Parse(json);

还有什么属性 JsonProperty 等效

Also what will be the attribute JsonProperty equivalent

public class ResponseJson
{
    [JsonProperty(PropertyName = "status")]
    public bool Status { get; set; }
    [JsonProperty(PropertyName = "message")]
    public string Message { get; set; }
    [JsonProperty(PropertyName = "Log_id")]
    public string LogId { get; set; }
    [JsonProperty(PropertyName = "Log_status")]
    public string LogStatus { get; set; }

    public string FailureReason { get; set; }
}

我将寻找与 Formating.None 等效的另一件事.

One more thing i will be looking for the equivalent of Formating.None.

推荐答案

你在这里问了几个问题:

You are asking a few questions here:

1. 我找不到 JObject.Parse(json);

您可以使用 JsonDocument 到 解析 并检查任何 JSON，从其 RootElement.根元素的类型为 JsonElement 代表任何 JSON 值(原始的或非原始的)并且对应于 Newtonsoft 的 JToken.

You can use JsonDocument to parse and examine any JSON, starting with its RootElement. The root element is of type JsonElement which represents any JSON value (primitive or not) and corresponds to Newtonsoft's JToken.

但请注意此文档 备注:

此类利用池化内存中的资源来最大程度地减少垃圾收集器 (GC) 在高使用情况下的影响.未能正确处置此对象将导致内存未返回到池中，这将增加跨框架各个部分的 GC 影响.

This class utilizes resources from pooled memory to minimize the impact of the garbage collector (GC) in high-usage scenarios. Failure to properly dispose this object will result in the memory not being returned to the pool, which will increase GC impact across various parts of the framework.

当您需要使用 JsonElement 在其文档的生命周期之外，您必须 克隆 它:

获取一个 JsonElement，它可以在原始 JsonDocument 的生命周期之后安全存储.

Gets a JsonElement that can be safely stored beyond the lifetime of the original JsonDocument.

还要注意 JsonDocument 当前是 只读 并且不提供用于创建或修改 JSON 的 API.有一个未解决的问题 问题 #39922:可写 Json DOM跟踪这个.

Also note that JsonDocument is currently read-only and does not provide an API for creating or modifying JSON. There is an open issue Issue #39922: Writable Json DOM tracking this.

使用示例如下:

//https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8#using-declarations 
using var doc = JsonDocument.Parse(json);

//Print the property names.
var names = doc.RootElement.EnumerateObject().Select(p => p.Name);
Console.WriteLine("Property names: {0}", string.Join(",", names)); // Property names: status,message,Log_id,Log_status,FailureReason

//Re-serialize with indentation.
using var ms = new MemoryStream();
using (var writer = new Utf8JsonWriter(ms, new JsonWriterOptions { Indented = true }))
{
    doc.WriteTo(writer);
}
var json2 = Encoding.UTF8.GetString(ms.GetBuffer(), 0, checked((int)ms.Length));

Console.WriteLine(json2);

public class ResponseJson
{
    [JsonPropertyName("status")]
    public bool Status { get; set; }
    [JsonPropertyName("message")]
    public string Message { get; set; }
    [JsonPropertyName("Log_id")]
    public string LogId { get; set; }
    [JsonPropertyName("Log_status")]
    public string LogStatus { get; set; }

    public string FailureReason { get; set; }
}