Json字符串：

[{
  "guardian_id": "1453",
  "guardian_name": "Foo Bar",
  "patient_id": "938",
  "patient_name": "Foo Bar",
}]

反序列化成的两个Model实例对象：

class Guardian {
  [JsonProperty(PropertyName = "guardian_id")]
  public int ID { get; set; }
  [JsonProperty(PropertyName = "guardian_name")]
  public int Name { get; set; }
}

class Patient {
  [JsonProperty(PropertyName = "patient_id")]
  public int ID { get; set; }
  [JsonProperty(PropertyName = "patient_name")]
  public int Name { get; set; }
}

1､分别反序化成实体(model)对象

string json = @"[{'guardian_id':'1453','guardian_name':'Foo Bar','patient_id':'938','patient_name':'Foo Bar'}]";
var guardians = JsonConvert.DeserializeObject<List<Guardian>>(json);
var patients = JsonConvert.DeserializeObject<List<Patient>>(json);

2､通过Pair类反序化

反序化一次就可以实现

Pair类如下：

public class Pair
{
    public Pair()
    {
        Guardian = new Guardian();
        Patient = new Patient();
    }
    [JsonIgnore]
    public Guardian Guardian { get; set; }
    [JsonIgnore]
    public Patient Patient { get; set; }
    [JsonProperty(PropertyName = "guardian_id")]
    public int GuardianID
    {
        get { return Guardian.ID; }
        set { Guardian.ID = value; }
    }
    [JsonProperty(PropertyName = "guardian_name")]
    public string GuardianName
    {
        get { return Guardian.Name; }
        set { Guardian.Name = value; }
    }
    [JsonProperty(PropertyName = "patient_id")]
    public int PatientID
    {
        get { return Patient.ID; }
        set { Patient.ID = value; }
    }
    [JsonProperty(PropertyName = "patient_name")]
    public string PatientName
    {
        get { return Patient.Name; }
        set { Patient.Name = value; }
    }
}

反序列化代码：

string json = @"[{'guardian_id':'1453','guardian_name':'Foo Bar','patient_id':'938','patient_name':'Foo Bar'}]";
var pairs = JsonConvert.DeserializeObject<Pair[]>(json);
if (pairs.Any())
{
    var pair = pairs[0];
    Console.WriteLine(pair.Guardian.Name);
    Console.WriteLine(pair.Patient.Name);
}