[英]JSON deserialized object returns null
string responseBody = await response.Content.ReadAsStringAsync();
status.result deserializeObject = JsonConvert.DeserializeObject<status.result>(responseBody);
Debug.WriteLine(deserializeObject.SafeGasPrice.ToString());
public class status
{
public class result
{
[JsonProperty(PropertyName = "SafeGasPrice")]
public int SafeGasPrice { get; set; }
[JsonProperty(PropertyName = "ProposeGasPrice")]
public int ProposeGasPrice { get; set; }
[JsonProperty(PropertyName = "FastGasPrice")]
public int FastGasPrice { get; set; }
}
}
{"status":"1","message":"OK","result":{"LastBlock":"14296250","SafeGasPrice":"96","ProposeGasPrice":"96","FastGasPrice":"97","suggestBaseFee":"95.407119606","gasUsedRatio":"0.174721033333333,0.523179548504219,0.056945596868572,0.999939743363228,0.953861217484817"}}
0
我目前不明白为什么 null 是 output,我的猜测是我错误地实现了 json 反序列化类。
您的数据 model 与提供的 JSON 不对应,它缺少与外部{"result": { }}
object 对应的类型:
{
"status":"1",
"message":"OK",
"result":{
// This inner object corresponds to your model.
"LastBlock":"14296250",
"SafeGasPrice":"96",
"ProposeGasPrice":"96",
"FastGasPrice":"97",
"suggestBaseFee":"95.407119606",
"gasUsedRatio":"0.174721033333333,0.523179548504219,0.056945596868572,0.999939743363228,0.953861217484817"
}
}
要解决此问题,您需要引入一个外部包装器 model。您可以像这样显式包装:
public class Root
{
public string status { get; set; }
public string message { get; set; }
public Result result { get; set; }
}
public class Result
{
[JsonProperty(PropertyName = "SafeGasPrice")]
public int SafeGasPrice { get; set; }
[JsonProperty(PropertyName = "ProposeGasPrice")]
public int ProposeGasPrice { get; set; }
[JsonProperty(PropertyName = "FastGasPrice")]
public int FastGasPrice { get; set; }
}
像这样反序列化:
var deserializeObject = JsonConvert.DeserializeObject<Root>(responseBody)?.result;
或者,您可以为根 model 使用匿名类型,如下所示:
var deserializeObject = JsonConvert.DeserializeAnonymousType(responseBody, new { result = default(Result) })?.result;
无论哪种方式,您现在都可以成功反序列化内部嵌套属性。
那你做错了什么? 在您的问题中,您将result
声明为嵌套类型:
public class status
{
public class result
{
[JsonProperty(PropertyName = "SafeGasPrice")]
public int SafeGasPrice { get; set; }
[JsonProperty(PropertyName = "ProposeGasPrice")]
public int ProposeGasPrice { get; set; }
[JsonProperty(PropertyName = "FastGasPrice")]
public int FastGasPrice { get; set; }
}
}
所有这一切都是在 scope 中定义另一种类型status
的类型result
。 它不会在status
中创建名为result
的属性。 由于不需要这样的嵌套,我建议将result
从内部status
中移出并将其重命名为Result
以遵循标准的 .NET 命名约定。
演示小提琴在这里。
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