将JSON从文件转换为列表<

当试图从文件反序列化JSON时，我收到以下异常:
Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List 1[Data.Models.Customer]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

我不知道为什么，因为我试图使用JArray。解析和JObject。解析文件。该文件当前只有一条记录，该记录如下所示:
{"FirstName":"thatFirstName","LastName":"thatLastName","Address":{"Street":"mook","City":"sin city","State":"AL","ZipCode":"90989"},"Id":"9304b36a-f1a9-4cd5-91d0-282648104967"}

我遇到问题的代码如下:

JArray persistValues = null;
if(File.Exists(fileName))
{
    FileInfo info = new FileInfo(fileName);
    if (info.Length != 0)
    {
        persistValues = JArray.Parse(File.ReadAllText(fileName));
        File.Delete(fileName);
    }
}
... extraneous code ...
else if(className.Equals("customer"))
{
    Customer customer = this as Customer;
    customer.Id = Guid.NewGuid();
    if (persistValues != null)
    {
        List<Customer> customers = persistValues.ToObject<List<Customer>>();
        customers.Add(customer);
        json = JsonConvert.SerializeObject(customers);
    }
    else
    {
        json = JsonConvert.SerializeObject(customer);
    }
}
... extraneous code ...
using (StreamWriter sw = new StreamWriter(stream))
{
    sw.Write(json);
}

我错过了什么?我可以写入文件很好，但我无法读取和解析数据回到我的对象…

旁注:使用JArray时我收到的错误如下:
Error reading JArray from JsonReader. Current JsonReader item is not an array: StartObject.