如何在Entity Framework中删除 [英] How to delete in Entity Framework

问题描述

我尝试了这个但是有一个问题..我知道我错过了一个非常重要的部分..我只是一个初学者所以我不是很擅长这个。如果有人可以帮助我，我会很高兴。

  protected   void  OnRowDeleting（ object  sender，GridViewDeleteEventArgs e）
 {
 
 
 尝试 
 {
 
 tblFee objtblFee = 新 tblFee（）; 
 
 
  int  index = Convert.ToInt32（e.RowIndex）; 
 
 
 objdbPollyClinicEntities.tblFees.DeleteObject（objtblFee）; 
 
 objdbPollyClinicEntities.SaveChanges（）; 
 
 populateGrd（）; 
 
 lblMsg.Text =  费用已成功删除。; 
 
} 
 
  catch （例外情况）
 {
 
 lblMsg .Text = ex.Message; 
} 

在aspx页面中我做了：

< asp：GridView ID =   grdShow runat =   server AutoGenerateColumns =   true AllowSorting =   true AllowPaging =   false 
 AutoGenerateDeleteButton =   true OnRowDeleting =   OnRowDeleting> 

解决方案

  protected   void  OnRowDeleting（ object  sender） ，GridViewDeleteEventArgs e）
 {
 
 
  try  
 {
  int  index = Convert.ToInt32（e.RowIndex）; 
 tblFee objtblFee = objdbPollyClinicEntities.tblFees.First（t => t。 yourprimarykey  == index）
 
 objdbPollyClinicEntities.tblFees.DeleteObject（objtblFee）; 
 
 objdbPollyClinicEntities.SaveChanges（）; 
 
 populateGrd（）; 
 
 lblMsg.Text =& amp; quot;费用已成功删除。& amp; quot ;; 
 
} 
 
  catch （例外情况）
 {
 
 lblMsg .Text = ex.Message; 
}& lt; / pre& gt; < /   pre  >  

I tried this but there's a problem.. I know I have missed out a very important part.. I'm just a beginner so I'm not so good at this. I'd be glad if someone could help me out.

protected void OnRowDeleting(object sender, GridViewDeleteEventArgs e)
       {


          try
           {

               tblFee objtblFee = new tblFee();


               int index = Convert.ToInt32(e.RowIndex);


               objdbPollyClinicEntities.tblFees.DeleteObject(objtblFee);

               objdbPollyClinicEntities.SaveChanges();

               populateGrd();

                lblMsg.Text = "Fee successfully deleted.";

           }

           catch (Exception ex)
          {

               lblMsg.Text = ex.Message;
           }

In aspx page I did:

<asp:GridView ID="grdShow" runat="server" AutoGenerateColumns="true" AllowSorting="true" AllowPaging="false"
      AutoGenerateDeleteButton="true" OnRowDeleting="OnRowDeleting" >

解决方案

protected void OnRowDeleting(object sender, GridViewDeleteEventArgs e)
       {


          try
           {
               int index = Convert.ToInt32(e.RowIndex);
               tblFee objtblFee =objdbPollyClinicEntities.tblFees.First(t=>t.yourprimarykey==index)

               objdbPollyClinicEntities.tblFees.DeleteObject(objtblFee);

               objdbPollyClinicEntities.SaveChanges();

               populateGrd();

                lblMsg.Text = "Fee successfully deleted.";

           }

           catch (Exception ex)
          {

               lblMsg.Text = ex.Message;
           }&lt;/pre&gt;</pre>

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