使用实体框架6 webform asp.net更新记录 [英] Update record using entity framework 6 webform asp.net

问题描述

您好，

我正在尝试使用asp.net webform使用Entity framework 6更新我的记录。

我在实体框架中为Language类创建存储库所以我可以从外面打电话给他们。

这是我的代码：







我能做什么，我的代码有什么问题？



我尝试了什么：



public static bool更新（语言朗珑）

{

试试

{

使用（QuranDBEntities context = new QuranDBEntities（））

{

语言_lang = context.Languages.Find（lang.LanguageID）;

_lang = lang;

context.Languages.Attach（_lang）;

context.SaveChanges（）;

}

返回true;

}

catch（Exception ex）

{

Auth.Document_Exception（ex）;

返回false;

}

}





但代码是例外：

 System.ObjectDisposedException：ObjectContext实例已被释放，无法再使用进行需要连接的操作。

我用这段代码调用函数：

语言x; 
 x = RepLanguage.Get（_langID）; 
 x.Name = txt_Name.Text; 
 x.Lang = txt_Lang.Text; 
 x.IsActive = bool.Parse（ddl_IsActive.SelectedValue）; 
 x.CreationDate = lbl_CreationDate.Text; 
 x.LastModifiedDate = DateTime.Now.ToShortDateString（）+; 
 RepLanguage.Update（x）; 
} 

解决方案

最后，我找到了解决方案。



就像我调用函数一样：

语言x; 
  //   ============== x = RepLanguage.Get（ _langID）;  
x =  new 语言（）; 
 x.LanguageID =  int  .Parse（txt_LanguageID.Text）; 
 x.Name = txt_Name.Text; 
 x.Lang = txt_Lang.Text; 
 x.IsActive =  bool  .Parse（ddl_IsActive.SelectedValue）; 
 x.CreationDate = lbl_CreationDate.Text; 
 x.LastModifiedDate = DateTime.Now.ToShortDateString（）+& quot;& quot ;; 
 RepLanguage.Update（x）; 
} < /   pre  > < /跨度> 

Hello,
I am trying to update my a record using Entity framework 6 with asp.net webform.
I create repository for the Language class in entity framework so I can call them from outside .
this is my code:



what can I do, and what is the problem with my code?

What I have tried:

public static bool Update(Language lang)
{
try
{
using(QuranDBEntities context = new QuranDBEntities())
{
Language _lang = context.Languages.Find(lang.LanguageID);
_lang = lang;
context.Languages.Attach(_lang);
context.SaveChanges();
}
return true;
}
catch(Exception ex)
{
Auth.Document_Exception(ex);
return false;
}
}


but the code through an exception :

System.ObjectDisposedException: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.

I call the function using this code:

Language x;
                    x = RepLanguage.Get(_langID);
                    x.Name = txt_Name.Text;
                    x.Lang = txt_Lang.Text;
                    x.IsActive = bool.Parse(ddl_IsActive.SelectedValue);
                    x.CreationDate = lbl_CreationDate.Text;
                    x.LastModifiedDate = DateTime.Now.ToShortDateString() + "";
                    RepLanguage.Update(x);
                }

解决方案

Finally, I found the Solution.

it was in the way I call the function:

Language x;
                    // ============== x = RepLanguage.Get(_langID);
    x = new Language();
    x.LanguageID = int.Parse(txt_LanguageID.Text);
    x.Name = txt_Name.Text;
    x.Lang = txt_Lang.Text;
    x.IsActive = bool.Parse(ddl_IsActive.SelectedValue);
    x.CreationDate = lbl_CreationDate.Text;
    x.LastModifiedDate = DateTime.Now.ToShortDateString() + "";
    RepLanguage.Update(x);
}</pre>

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