c# - JsonDocument 获取 JSON 字符串

Question

我需要一个从 JsonDocument 获取 JSON 字符串的示例。我可以通过 RootElement.GetProperty("ItemName") 获得属性然后调用.GetString()但看不到将根元素作为 JSON 字符串获取的方法？

Answer 1

这里有一个例子:

JsonDocument jdoc = JsonDocument.Parse("{\"a\":123}");

using(var stream = new MemoryStream())
{
    Utf8JsonWriter writer = new Utf8JsonWriter(stream, new JsonWriterOptions { Indented = true });
    jdoc.WriteTo(writer);
    writer.Flush();
    string json = Encoding.UTF8.GetString(stream.ToArray());
}

为了更容易使用，您可以将其放在扩展方法中，例如:

public static string ToJsonString(this JsonDocument jdoc)
{
    using (var stream = new MemoryStream())
    {
        Utf8JsonWriter writer = new Utf8JsonWriter(stream, new JsonWriterOptions { Indented = true });
        jdoc.WriteTo(writer);
        writer.Flush();
        return Encoding.UTF8.GetString(stream.ToArray());
    }
}

并像这样使用它:

JsonDocument jdoc = JsonDocument.Parse("{\"a\":123}");
string json = jdoc.ToJsonString();