我正在尝试将字符串反序列化为具有以下结构的类：

// this is my json
    {
      "MethodName":"PRC_SET_COMMISSION_STATIC",
      "Input":"{"reqType":"U","sapId":17000100,"offerType":5,"commissionRate":4,"accountNo":null,"fromDate":"2022-05-29T00:00:00","toDate":"2029-05-29T00:00:00","userId":"13601360"}"}

这是我的类，我想得到这些值：

public class ProcessRequestRequestModelCl :AuthenticationModelCl
    {
        public string MethodName { get; set; }
        public string Input { get; set; }
    }

所以我要做的是这样的：

ProcessRequestRequestModelCl RequestModel = System.Text.Json.JsonSerializer.Deserialize<ProcessRequestRequestModelCl>(ParameterStr);

但我得到了这个错误：* *“r”在值后无效。应为“，”、“}”或“]”**问题与"Input":"{"reqType":"U","sapId":17000100,"offerType":5,"commissionRate":4,"accountNo":null,"fromDate":"2022-05-29T00:00:00","toDate":"2029-05-29T00:00:00","userId":"13601360"}"有关。我想知道如何将json作为字符串传递给输入值。