ServiceStack OrmLite,未知模块中出现“System.NullReferenceException”类型的第一次机会异常

时间:2013-07-17 05:18:03

标签: ormlite-servicestack

我正在尝试使用ServiceStack OrmLite,但是现在我对此异常感到困惑:A first chance exception of type 'System.NullReferenceException' occurred in Unknown Module.

也没有堆栈跟踪。

这是我的OrmLite代码:

namespace ConsoleApplication1
{
    class Program
    {
            static void Main(string[] args) {
            string DbConnection = "SERVER=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxx.xxx.xxx.xxx)(PORT=9530))(CONNECT_DATA=(SERVICE_NAME=MYSID)));uid=myusername;pwd=mypassword";

            var dbFactory = new OrmLiteConnectionFactory(DbConnection, false, OracleDialect.Provider);

            using (var db = dbFactory.Open()) {
                var res = db.Select<Einduk>().Take(10);
                foreach (var einduk in res) {
                    Console.WriteLine(einduk.ToString());
                }
            }
            Console.ReadLine();
        }
    }
}

这是我的模特课:

namespace ConsoleApplication1
{
    public class Einduk
    {           
        [PrimaryKey]
        public string Akaun { get; set; }
        public string Jenis { get; set; }
        public string Bakaun { get; set; }
        public string Oldac { get; set; }
        public string Plgid { get; set; }
        public string Pnama { get; set; }
        public string Almat { get; set; }
        public string Kslah { get; set; }
        public DateTime Trikh { get; set; }
        public decimal Amaun { get; set; }

        public override string ToString() {
            return string.Format("Jenis: {0}, Akaun: {1}, Bakaun: {2}, Oldac: {3}, Plgid: {4}, Pnama: {5}, Almat: {6}, Kslah: {7}, Trikh: {8}, Amaun: {9}", Jenis, Akaun, Bakaun, Oldac, Plgid, Pnama, Almat, Kslah, Trikh, Amaun);
        }
    }
}

这是我的表格,请注意表格没有主键。但在我的模型中,我将Akaun设置为主键,因为我知道它是唯一的。 这会导致问题吗?

CREATE TABLE "EINDUK" 
(   
    "JENIS" CHAR(1 BYTE), 
    "AKAUN" VARCHAR2(40 BYTE), 
    "BAKAUN" VARCHAR2(50 BYTE), 
    "OLDAC" VARCHAR2(20 BYTE), 
    "PLGID" VARCHAR2(15 BYTE), 
    "PNAMA" VARCHAR2(100 BYTE), 
    "ALMAT" VARCHAR2(282 BYTE), 
    "KSLAH" VARCHAR2(508 BYTE), 
    "TRIKH" DATE, 
    "AMAUN" NUMBER
)

1 个答案:

答案 0 :(得分:3)

这是因为在我的模型类中,我没有将我的属性设置为可空,就像这样..

public DateTime? Trikh { get; set; }
public decimal? Amaun { get; set; }