这就是我的网格视图的样子：
我需要删除选定的行，其中有一个隐藏列activityID and taskID，我将其设置为 false，因为我需要它们的值才能将其从数据库中删除。我必须使用从数据库中删除QuestionNo , activityID and taskID。
ActivityID and TaskID is hidden，它实际上看起来像这样：
QuestionNo,ActivtiyID,TaskID,QuestionContent 然后删除。
代码 ：
protected void gvQuestion_RowCommand(object sender, GridViewCommandEventArgs e)
{
}
protected void gvQuestion_RowDeleted(object sender, GridViewDeletedEventArgs e)
{
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
}
protected void gvQuestion_RowDeleting1(object sender, GridViewDeleteEventArgs e)
{
gvQuestion.DeleteRow(e.RowIndex);
Model.question del = new Model.question();
int q = Convert.ToInt32(gvQuestion.Rows[e.RowIndex].Cells[0].ToString());
int a = Convert.ToInt32(gvQuestion.Rows[e.RowIndex].Cells[1].ToString()); // Hidden Column
int t = Convert.ToInt32(gvQuestion.Rows[e.RowIndex].Cells[2].ToString()); // Hidden Column
del.QuestionNo = q;
del.ActivityID = a;// Value of ActivityID column in GV
del.TaskID = t; // Value of TaskID column in GV
daoQuestion.Delete(del);
daoQuestion.Save();
}`
据我所知，一旦按下删除按钮，它就会触发 OnRowDeleting 事件，所以我将删除代码放在那里，但是当我尝试删除时连接重置，q、a、t 的值为 null，这里出了什么问题？，删除按钮不起作用..请帮助，谢谢。我正在使用EF来做这个顺便说一句......
这是 aspx ：
<asp:GridView ID="gvQuestion" runat="server"
AutoGenerateColumns="False"
onselectedindexchanged="gvQuestion_SelectedIndexChanged"
onrowcommand="gvQuestion_RowCommand" onrowdeleted="gvQuestion_RowDeleted" onrowdeleting="gvQuestion_RowDeleting1"
>
<Columns>
<asp:BoundField DataField="QuestionNo" HeaderText="QuestionNo"
InsertVisible="False" ReadOnly="True" SortExpression="QuestionNo" />
<asp:BoundField DataField="ActivityID" HeaderText="ActivityID"
SortExpression="ActivityID" Visible="False" />
<asp:BoundField DataField="TaskID" HeaderText="TaskID"
SortExpression="TaskID" Visible="False" />
<asp:BoundField DataField="joined" HeaderText="QuestionContent"
SortExpression="joined" >
<ControlStyle Width="150px" />
</asp:BoundField>
<asp:TemplateField>
<ItemTemplate>
<span onclick="return confirm('Are you sure to Delete the record?')">
<asp:LinkButton ID="LinkButton1" runat="server" CommandName="Delete"
onclick="LinkButton1_Click" CommandArgument="Delete">Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
使用数据键（如果这是正确的方法，则不知道）：
aspx：
DataKeyNames="QuestionNo,ActivityID,TaskID"
后面的代码：
protected void gvQuestion_RowDeleting1(object sender, GridViewDeleteEventArgs e)
{
GridView gvQuestion = (GridView)sender;
int row = e.RowIndex;
int q = Convert.ToInt32(gvQuestion.DataKeys[row].Value[0].ToString());
int a= Convert.ToInt32(gvQuestion.DataKeys[row].Value[1].ToString());
int t = Convert.ToInt32(gvQuestion.DataKeys[row].Value[2].ToString()); // I assume that value 0 , 1 , 2 is according to the columns , not really sure on this.
/* Model.question del = new Model.question();
del.QuestionNo = q;
del.ActivityID = a;// Value of ActivityID column in GV
del.TaskID = t; // Value of TaskID column in GV
daoQuestion.Delete(del);
daoQuestion.Save();
gvQuestion.DataBind(); */
}
我只是想检索这些值，所以我将注释掉删除代码..我通过调试检查值并返回 0 。这是正确的方法吗？