求解未将对象引用设置到对象的实例!!

Question

未将对象引用设置到对象的实例。 
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误: 
行 13:     public class OnlineJob : ModelBase
行 14:     {
行 15:         public OnlineJob()
行 16:             : base()
行 17:         {
 
堆栈跟踪: 
[NullReferenceException: 未将对象引用设置到对象的实例。]
   Model.ModelBase..ctor() +485
   ABC.OnlineJob..ctor() in f:\fskenen\App_Code\OnlineJob.cs:15[TargetInvocationException: 调用的目标发生了异常。]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
   System.Activator.CreateInstance() +111
   Model.ObjectFactory.GetObject(String keyValue) +150
   Admin_OnlineJobDetail.Page_Load(Object sender, EventArgs e) in f:\fskenen\Admin\OnlineJobDetail.aspx.cs:15
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627 

Answer 1

都null了那就看看那儿为null了啊 光这样说没人能帮的了你

Answer 2

一般这种错误就是因为哪个地方等于null了，你下断点就能看到

Answer 3

你取得的值肯定是Null，你自己调试一下吧！

Answer 4

这是全代码
using System;
using System.Text;
using System.Data;
using System.Collections.Generic;
using Helper;
using Model;/// <summary>
///OnlineJob 的摘要说明
/// </summary>
namespace ABC
{
    public class OnlineJob : ModelBase
    {
        public OnlineJob()
            : base()
        {
            this._KeyName = "ID";
            this.FileColumns = null;
        }
        public string Job
        {
            get
            {
                return this.MyRow["Job"].ToString();
            }
            set
            {
                this.MyRow["Job"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string ContactAddress
        {
            get
            {
                return this.MyRow["ContactAddress"].ToString();
            }
            set
            {
                this.MyRow["ContactAddress"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public DateTime CreateTime
        {
            get
            {
                return Convert.ToDateTime(this.MyRow["CreateTime"]);
            }
            set
            {
                this.MyRow["CreateTime"] = (value != null) ? value.ToString("yyyy-MM-dd") : DateTime.Now.ToString("yyyy-MM-dd");
            }
        }
        public string Detail
        {
            get
            {
                return this.MyRow["Detail"].ToString();
            }
            set
            {
                this.MyRow["Detail"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Email
        {
            get
            {
                return this.MyRow["Email"].ToString();
            }
            set
            {
                this.MyRow["Email"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public int ID
        {
            get
            {
                return Convert.ToInt32(this.MyRow["ID"]);
            }
            set
            {
                this.MyRow["ID"] = value.ToString();
            }
        }
        public string Phone
        {
            get
            {
                return this.MyRow["Phone"].ToString();
            }
            set
            {
                this.MyRow["Phone"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Census
        {
            get
            {
                return this.MyRow["Census"].ToString();
            }
            set
            {
                this.MyRow["Census"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        //public DateTime ReplyTime
        //{
        //    get
        //    {
        //        return Convert.ToDateTime(this.MyRow["ReplyTime"]);
        //    }
        //    set
        //    {
        //        this.MyRow["ReplyTime"] = (value != null) ? value.ToString("yyyy-MM-dd") : DateTime.Now.ToString("yyyy-MM-dd");
        //    }
        //}
        public int Status
        {
            get
            {
                return Convert.ToInt32(this.MyRow["Status"]);
            }
            set
            {
                this.MyRow["Status"] = value.ToString();
            }
        }
        public string Professional
        {
            get
            {
                return this.MyRow["Professional"].ToString();
            }
            set
            {
                this.MyRow["Professional"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public int TypeID
        {
            get
            {
                return Convert.ToInt32(this.MyRow["TypeID"]);
            }
            set
            {
                this.MyRow["TypeID"] = value.ToString();
            }
        }
        public bool Visible
        {
            get
            {
                return this.MyRow["Visible"] != "0";
            }
            set
            {
                this.MyRow["Visible"] = (value != null && value) ? "1" : "0";
            }
        }
        public bool IsMan
        {
            get
            {
                return this.MyRow["IsMan"] != "0";
            }
            set
            {
                this.MyRow["IsMan"] = (value != null && value) ? "1" : "0";
            }
        }
        public bool IsMarried
        {
            get
            {
                return this.MyRow["IsMarried"] != "0";
            }
            set
            {
                this.MyRow["IsMarried"] = (value != null && value) ? "1" : "0";
            }
        }
       
        public string YourName
        {
            get
            {
                return this.MyRow["YourName"].ToString();
            }
            set
            {
                this.MyRow["YourName"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Graduation
        {
            get
            {
                return this.MyRow["Graduation"].ToString();
            }
            set
            {
                this.MyRow["Graduation"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Other
        {
            get
            {
                return this.MyRow["Other"].ToString();
            }
            set
            {
                this.MyRow["Other"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string WorkExperience
        {
            get
            {
                return this.MyRow["WorkExperience"].ToString();
            }
            set
            {
                this.MyRow["WorkExperience"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Res
        {
            get
            {
                return this.MyRow["Res"].ToString();
            }
            set
            {
                this.MyRow["Res"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string School
        {
            get
            {
                return this.MyRow["School"].ToString();
            }
            set
            {
                this.MyRow["School"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Height
        {
            get
            {
                return this.MyRow["Height"].ToString();
            }
            set
            {
                this.MyRow["Height"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string National
        {
            get
            {
                return this.MyRow["National"].ToString();
            }
            set
            {
                this.MyRow["National"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
        public string Bron
        {
            get
            {
                return this.MyRow["Bron"].ToString();
            }
            set
            {
                this.MyRow["Bron"] = (value != null) ? value.Replace("'", "") : string.Empty;
            }
        }
    }
}

Answer 5

类型转换你没有做异常处理哦。
当你的Convert.ToInt32 参数不是 纯数字的字符串的时候，还是会出现异常的哦。

Answer 6

类似“return this.MyRow["ContactAddress"].ToString(); “这样的ToString()方法，
如果你的这一行这一列的值是Null，也是会报错的！

Answer 7

调试下就知道哪里是null了，楼主要学会举一反三，而不是一而再再而三的问这类问题

Answer 8

代码中有实例为Null。调试跟踪下看到底是那个。