JsonConvert DeserializeObject 找不到 int 成员

Question

我有一个奇怪的情况，我的其他类正在正确反序列化，但是这个具有三个 int 值的类没有正确反序列化。使用跟踪编写器设置，我看到 Json.Net 报告它找不到成员，但我不确定为什么。

类：

public class BroadcastMemoryResponse : BaseResponse
{
    public int FreeMemory { get; set; }

    [JsonProperty("Malloc_Count")]
    public int MallocCount { get; set; }

    [JsonProperty("Free_Count")]
    public int FreeCount { get; set; }
}

JSON：

{
  "ID": 100,
  "Service": "BroadcastMemory",
  "FreeMemory: ": 50508,
  "Malloc_Count: ": 10050409,
  "Free_Count: ": 10049533,
  "Status": "Success"
}

请注意，ID、Service 和 Status 字段位于 BaseResponse 类中，并且这些字段已成功反序列化（ID 是一个 int 并且可以正确反序列化）。当 JSON 映射到 C# 时，我使用 JsonProperties 删除 JSON 中的下划线。类和属性都是公开的，getter/setter 也是公开的，所以不确定问题是什么..？

测试反序列化代码：

ITraceWriter traceWriter = new MemoryTraceWriter();
var settings = new JsonSerializerSettings { TraceWriter = traceWriter };
string str = "{\"ID\":100,\"Service\":\"BroadcastMemory\",\"FreeMemory: \":50508,\"Malloc_Count: \":10050409,\"Free_Count: \":10049533,\"Status\":\"Success\"}";
var deserializedObj = JsonConvert.DeserializeObject<BroadcastMemoryResponse>(str, settings);

跟踪器输出：

2017-01-30T09:49:46.807 Info Started deserializing TcpClient.Core.Model.BroadcastMemoryResponse. Path 'ID', line 1, position 6.
2017-01-30T09:49:46.836 Verbose Could not find member 'FreeMemory: ' on TcpClient.Core.Model.BroadcastMemoryResponse. Path '['FreeMemory: ']', line 1, position 51.
2017-01-30T09:49:46.838 Verbose Could not find member 'Malloc_Count: ' on TcpClient.Core.Model.BroadcastMemoryResponse. Path '['Malloc_Count: ']', line 1, position 74.
2017-01-30T09:49:46.838 Verbose Could not find member 'Free_Count: ' on TcpClient.Core.Model.BroadcastMemoryResponse. Path '['Free_Count: ']', line 1, position 98.
2017-01-30T09:49:46.840 Info Finished deserializing TcpClient.Core.Model.BroadcastMemoryResponse. Path '', line 1, position 126.
2017-01-30T09:49:46.841 Verbose Deserialized JSON: 
{
  "ID": 100,
  "Service": "BroadcastMemory",
  "FreeMemory: ": 50508,
  "Malloc_Count: ": 10050409,
  "Free_Count: ": 10049533,
  "Status": "Success"
}

Answer 1

问题在于，在您的 Json 中，您的属性名称格式错误（例如 "FreeMemory: " 而不是 "FreeMemory"）。这一行：

"{ … \"FreeMemory: \":50508,\"Malloc_Count: \":10050409,\"Free_Count: \":10049533, … }"

应该是：

"{ … \"FreeMemory\":50508,\"Malloc_Count\":10050409,\"Free_Count\":10049533, … }"

或者，如果您实际上无法控制消息，则可以简单地更改 JsonProperty 属性：

[JsonProperty("FreeMemory: ")]
public int FreeMemory { get; set; }

[JsonProperty("Malloc_Count: ")]
public int MallocCount { get; set; }

[JsonProperty("Free_Count: ")]
public int FreeCount { get; set; }