Question

我有一个Web API动作方法，该方法返回一个Dictionary<int, int>作为响应：

[HttpPost("PostStats")]
public async Task<IActionResult> PostStats([FromBody]StatsBody body)
{
    Dictionary<int, int> myDic= new Dictionary<int, int>();
    ... //Do something with body and myDic
    return Ok(myDic);
}

通过HttpClient调用该方法：

StatsBody stats = GetStatsBody();
using (var httpClient = new HttpClient { BaseAddress = new Uri(ROOT_ENDPOINT) })
{
    // Serializes the content to be sent to the REST service
    var content = new StringContent(JsonConvert.SerializeObject(stats), Encoding.UTF8, "application/json");
    // Sends the request to the REST service
    HttpResponseMessage response = await httpClient.PostAsync(URL, content);
    // Gets the response as string
    string output = await response.Content.ReadAsStringAsync();
    if (response.StatusCode == HttpStatusCode.OK)
    {
        //Deserialize the response into a a Dictionary<int, int>
        myDic = JsonConvert.DeserializeObject<Dictionary<int, int>>(output);
    }
    else
        return BadRequest(output);
}

myDic = JsonConvert.DeserializeObject<Dictionary<int, int>>(output)指令由于无法反序列化对象而给出了异常。

Newtonsoft.Json.JsonSerializationException: Error converting value "{"0":562,"1":563,"2":564}" to type 'System.Collections.Generic.Dictionary`2[System.Int32,System.Int32]'. 

System.ArgumentException: Could not cast or convert from System.String to System.Collections.Generic.Dictionary`2[System.Int32,System.Int32].

即使我使用Dictionary<string, int>或Dictionary<string, dynamic>，也会出现异常。如果我检查变量output，则其内容格式如下：

"{\"0\":565,\"1\":566,\"2\":567}"

这实际上不是有效的JSON格式。唯一可以通过使用以下方法获得正确的反序列化：

string temp = JsonConvert.DeserializeObject<string>(output);
myDic = JsonConvert.DeserializeObject<Dictionary<int, int>>(temp);

我在做什么错，如何获得更清晰的解决方案？

PS：

如果我使用Typescript客户端，然后使用JSON.parse将响应解析为一个关联数组（基本上是一个字典），则没有问题。

Web API中的REST服务之间序列化和反序列化Dictionary <int，int =“”>

0 个答案: