De-serializing json format string

Your class structure is wrong. The json string contains a list of face_list not a single object. Furthermore your current face_list class does not contain any properties just two nested class definitions which will not hold any values.

Correct structure:

public class FaceDetect
{
    public int age { get; set; }
    public int beauty { get; set; }
    public int expression { get; set; }
    public int gender { get; set; }
    public bool glass { get; set; }
    public int smile { get; set; }
}

public class FaceRecg
{
    public int confidence { get; set; }
    public string name { get; set; }
    public string person_id { get; set; }
}

public class FaceList
{
    public FaceDetect face_detect { get; set; }
    public FaceRecg face_recg { get; set; }
}

public class CustomerNTF
{
    public List<FaceList> face_list { get; set; }
    public int face_num { get; set; }
    public string msg_id { get; set; }
}

In the future if you are not sure how your class structure has to look like to match a given json string you can use a tool like json2csharp. Which generates the correct structure for you.

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