public async Task Te()
    {
        try
        {
            TestClass c = new TestClass() { a = "123" };
            var data = new TestTable() { j = JObject.FromObject(c),id=1,t=c };
            //正常
            await db.InsertOrUpdate<TestTable>().SetSource(data).ExecuteAffrowsAsync();
            //System.NullReferenceException: Object reference not set to an instance of an object.
            await db.InsertOrUpdate<TestTable>().SetSource(data).ExecutePgCopyAsync();
            //有jsonmap 字段t 不加NoneParameter()报错 图1为错误信息 
            //去掉jsonmap 字段t 不管加不加NoneParameter()都报错 图2为错误信息
            await db.Insert<TestTable>()
                .NoneParameter()
                .OnConflictDoUpdate()
                .ExecuteAffrowsAsync();
        }catch (Exception e)
        {
            Debugger.Break();
        }
    }
    [Table(Name = "test")]
    public class TestTable
    {
        [Column(IsPrimary = true)]
        public int id { get; set; }
        public JObject j { get; set; }
        [JsonMap]
        public TestClass t { get; set; }
    }

    public class TestClass
    {
        public string a { get; set; }
    }