Question

我正在使用Visual Studio 2015和Entity Framework 6.我有一个Gridview我试图能够删除和编辑。我尝试了各种方法，没有任何工作。

这就是我所拥有的：

  protected void gvExOr_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        using (PizzaParlor2Entities po = new PizzaParlor2Entities())
        {
            var PizzaID = Convert.ToInt32(gvExOr.Rows[e.RowIndex].Cells[0].Text.ToString());
            //  var SizeID = Convert.ToInt32(gvExOr.Rows[e.RowIndex].Cells[1].Text.ToString());


            Pizza newPiz = new Pizza()
            {
                PizzaID = PizzaID
            };


            po.SaveChanges();

        }
    }

我的网格视图：

  <asp:GridView ID="gvExOr" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" 
                DataKeyNames="PizzaID,OrderID" OnRowDeleting="gvExOr_RowDeleting"  OnRowUpdating="gvExOr_RowUpdating"
                AllowPaging="true" AllowSorting="true" AutoGenerateColumns="false">

    <Columns>
        <asp:CommandField ShowDeleteButton="True" ShowEditButton="true"  />

        <asp:BoundField DataField="PizzaID" HeaderText="PizzaID" ReadOnly="True" SortExpression="PizzaID" />
        <asp:BoundField DataField="OrderID" HeaderText="OrderID" ReadOnly="True" SortExpression="OrderID" />
        <asp:BoundField DataField="FirstName" HeaderText="First Name" ReadOnly="True" SortExpression="FirstName" />
         <asp:BoundField DataField="LastName" HeaderText="Last Name" ReadOnly="True" SortExpression="LastName" />
        <asp:BoundField DataField="Size" HeaderText="Size" SortExpression="Size" />
        <asp:BoundField DataField="Crust" HeaderText="Crust" SortExpression="Crust" />
        <asp:BoundField DataField="Sauce" HeaderText="Sauce" SortExpression="Sauce" />
        <asp:CheckBoxField DataField="Delivery" HeaderText="Delivery" SortExpression="Delivery" />
        <asp:BoundField DataField="OrderPrice" HeaderText="OrderPrice" DataFormatString="{0:c}" SortExpression="OrderPrice" />
    </Columns>

                <AlternatingRowStyle BackColor="White" />
                <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
                <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
                <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
                <SortedAscendingCellStyle BackColor="#FDF5AC" />
                <SortedAscendingHeaderStyle BackColor="#4D0000" />
                <SortedDescendingCellStyle BackColor="#FCF6C0" />
                <SortedDescendingHeaderStyle BackColor="#820000" />
            </asp:GridView>

如何在ASP.net Entity Framework 6上删除和编辑行？

Answer 1

使用您的代码创建新的Pizza对象。

将RowEditing事件添加到网格中，并在事件中通过id找到对象（可选，将对象id存储在网格列中），更新其数据并再次保存。

进行编辑：

using (PizzaParlor2Entities po = new PizzaParlor2Entities())
{
    var PizzaID = Convert.ToInt32(gvExOr.Rows[e.RowIndex].Cells[0].Text.ToString());
    var oldPizza = po.Pizza.Find(PizzaID); // retrieve the object by the id
    // update the needed data
    oldPizza.Price =  gvExOr.Rows[e.RowIndex].Cells[1].Text.ToString();

    //save changes to DB
    po.SaveChanges();

}

删除：

using (PizzaParlor2Entities po = new PizzaParlor2Entities())
{
    var PizzaID = Convert.ToInt32(gvExOr.Rows[e.RowIndex].Cells[0].Text.ToString());
    po.Pizza.Delete(p => p.PizzaID == PizzaID); // delete the object by the id
    //save changes to DB
    po.SaveChanges();

}

ASP.net EF Gridview行删除

1 个答案: