ArgumentNullException不能由用户进行管理。 [英] ArgumentNullExceptioncan not be handeled by user.

问题描述

我从多个表中删除记录时遇到问题，

当我试图删除记录时，它会出现异常

  ArgumentNullExceptioncan 不    handeled  由用户。 
 值 不能   < span class =code-leadattribute> null 。 
 参数 名称： 实体 

代码：

 [ NonAction] 
  private  FinancilInstituteWrappergetData（ int  id）
 {
 FinancilInstituteWrapper temp = newFinancilInstituteWrapper（）; 
  var  details = 来自 i indb.IIDBS 
  join  a indb.ACDBS 
 oni.Idequalsa.Id 
  join  b indb.BIDBSoni.Idequalsb.Id 
 wherei.Id == id 
 selectnewFinancilInstituteWrapper 
 {
 II = i，
 AC = a，
 BI = b 
}; 
  foreach （FinancilInstituteWrapper a  in 详情）
 {
 temp。 II = a.II; 
 temp.BI = a.BI; 
 temp.AC = a.AC; 
} 
 
  return  temp; 
} 

 // 
 // GET：/ FinancilInstitute / Delete / 5 
 publicActionResult Delete（int id = 0）
 {
 return View（getData（id））; 
} 
 
 // 
 // POST：/ FinancilInstitute / Delete / 5 
 
 [HttpPost，ActionName（Delete）] 
 publicActionResultDeleteConfirmed（int id = 0）
 {
 FinancilInstituteWrapper wrapper = newFinancilInstituteWrapper（）; 
 db.IIDBS.Remove（wrapper.II）; 
 db.ACDBS.Remove（wrapper.AC）; 
 db.BIDBS.Remove（wrapper.BI）; 
 db.SaveChanges（）; 
 returnRedirectToAction（Index）; 
} 

查看：

<％@ PageTitle =  语言= C＃ 的MasterPageFile = 〜/查看/共享/的Site.Master 继承= System.Web.Mvc.ViewPage< BachatGatProjectFinal.Controllers.FinancilInstituteWrapper> 中％GT; 
 
< h2>删除< / h2> 
 
< h3>您确定要删除此内容吗？< / h3> 
< fieldset> 
< legend> FinancilInstituteWrapper< / legend> 
 
< div> 
<％：Html.HiddenFor（m => m.II.Id）％> 
< / div> 
 
< div> 
学院名称
<％：Html.DisplayFor（m => m.II.InstituteName）％> 
< / div> 
 
< div> 
所有者名字
<％：Html.DisplayFor（m => m.II.OwnersFirstName）％> 
< / div> 
 
< div> 
所有者姓氏
<％：Html.DisplayFor（m => m.II.OwnersLastName）％> 
< / div> 
 
< div> 
<％：Html.HiddenFor（m => m.AC.Id）％> 
< / div> 
 
< div> 
地址
<％：Html.DisplayFor（m => m.AC.Address）％> 
< / div> 
 
< div> 
 City 
<％：Html.DisplayFor（m => m.AC.City）％> 
< / div> 
 
< div> 
州
<％：Html.DisplayFor（m => m.AC.State）％> 
< / div> 
 
< div> 
 PinCode 
<％：Html.DisplayFor（m => m.AC.PinCode）％> 
< / div> 
 
< div> 
电话
<％：Html.DisplayFor（m => m.AC.Phone）％> 
< / div> 
 
< div> 
电子邮件
<％：Html.DisplayFor（m => m.AC.Email）％> 
< / div> 
 
< div> 
<％：Html.HiddenFor（m => m.BI.Id）％> 
< / div> 
 
< div> 
 BankName 
<％：Html.DisplayFor（m => m.BI.BankName）％> 
< / div> 
 
< div> 
分支
<％：Html.DisplayFor（m => m.BI.Branch）％> 
< / div> 
 
< div> 
帐号
<％：Html.DisplayFor（m => m.BI.AccountNumber）％> 
< / div> 
 
< div> 
 MICR 
<％：Html.DisplayFor（m => m.BI.MICR）％> 
< / div> 
 
< div> 
 IFSC 
<％：Html.DisplayFor（m => m.BI.IFSC）％> 
< / div> 
< / fieldset> 
<％using（Html.BeginForm（））{％> 
< p> 
< inputtype =submitvalue =删除/> | 
<％：Html.ActionLink（返回列表，索引）％> 
< / p> 
<％}％> 

请帮助

解决方案

请首先检查完整的进程是否有任何空值进入数据库

由于下面的行可能会抛出您的异常。所以检查该实体的空值（即 indb.BIDBSoni.Idequalsb！= null ）在加入之前。

  join  b indb.BIDBSoni.Idequalsb.Id 
 其中 i.Id == id 

Hi,
I am fetching the problem with deleteing the record from multiple tables,
When I m trying to delete the record its ocours the exception

ArgumentNullExceptioncan not be handeled by user.
Value cannot be null.
Parameter name: entity

Code :

       [NonAction]
private FinancilInstituteWrappergetData(int id)
        {
FinancilInstituteWrapper temp = newFinancilInstituteWrapper();
var details = from i indb.IIDBS
join a indb.ACDBS
oni.Idequalsa.Id
join b indb.BIDBSoni.Idequalsb.Id
wherei.Id==id
selectnewFinancilInstituteWrapper
                          {
                              II = i,
                              AC = a,
                              BI = b
                          };
foreach (FinancilInstituteWrapper a in details)
            {
temp.II = a.II;
                temp.BI = a.BI;
                temp.AC = a.AC;
            }

return temp;
        }

//
// GET: /FinancilInstitute/Delete/5
publicActionResult Delete(int id=0)
        {
return View(getData(id));
        }

//
// POST: /FinancilInstitute/Delete/5

        [HttpPost,ActionName("Delete")]
publicActionResultDeleteConfirmed(int id = 0)
        {
FinancilInstituteWrapper wrapper = newFinancilInstituteWrapper();         
db.IIDBS.Remove(wrapper.II);
db.ACDBS.Remove(wrapper.AC);
db.BIDBS.Remove(wrapper.BI);
db.SaveChanges();
returnRedirectToAction("Index");           
        }

View:

<%@PageTitle=""Language="C#"MasterPageFile="~/Views/Shared/Site.Master"Inherits="System.Web.Mvc.ViewPage<BachatGatProjectFinal.Controllers.FinancilInstituteWrapper>"%>

<h2>Delete</h2>

<h3>Are you sure you want to delete this?</h3>
<fieldset>
<legend>FinancilInstituteWrapper</legend>

<div>
<%:Html.HiddenFor(m=>m.II.Id) %>
</div>

<div>
        Institute Name
<%:Html.DisplayFor(m=>m.II.InstituteName) %>
</div>

<div>
        Owners First Name
<%:Html.DisplayFor(m=>m.II.OwnersFirstName) %>
</div>

<div>
        Owners Last Name
<%:Html.DisplayFor(m=>m.II.OwnersLastName) %>
</div>

<div>
<%:Html.HiddenFor(m=>m.AC.Id) %>
</div>

<div>
        Address
<%:Html.DisplayFor(m=>m.AC.Address) %>
</div>

<div>
        City
<%:Html.DisplayFor(m=>m.AC.City) %>
</div>

<div>
        State
<%:Html.DisplayFor(m=>m.AC.State) %>
</div>

<div>
PinCode
<%:Html.DisplayFor(m=>m.AC.PinCode) %>
</div>

<div>
        Phone
<%:Html.DisplayFor(m=>m.AC.Phone) %>
</div>

<div>
        Email
<%:Html.DisplayFor(m=>m.AC.Email) %>
</div>

<div>
<%:Html.HiddenFor(m=>m.BI.Id) %>
</div>

<div>
BankName
<%:Html.DisplayFor(m=>m.BI.BankName) %>
</div>

<div>
        Branch
<%:Html.DisplayFor(m=>m.BI.Branch) %>
</div>

<div>
        Account Number
<%:Html.DisplayFor(m=>m.BI.AccountNumber) %>
</div>

<div>
        MICR
<%:Html.DisplayFor(m=>m.BI.MICR) %>
</div>

<div>
        IFSC
<%:Html.DisplayFor(m=>m.BI.IFSC) %>
</div>
</fieldset>
<%using (Html.BeginForm()) { %>
<p>
<inputtype="submit"value="Delete"/> |
<%:Html.ActionLink("Back to List", "Index") %>
</p>
<% } %>

Pls help

解决方案

kindly first check the complete process whether is there any null value going into the data base

Your exception may be thrown due to below line.So check the null-ability of that entity (i.e. indb.BIDBSoni.Idequalsb != null ) before do the join.

join b indb.BIDBSoni.Idequalsb.Id
where i.Id==id

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