我尝试更新,但是我收到一个错误“索引超出限制。我不应该是负数,应该小于集合的大小”这个问题在调试中这个问题“Dim courseId As String = gridViewCourse.DataKeys (e.RowIndex).Values( “CourseId”)。的ToString()“
这是我的网格asp代码
<asp:GridView ID="gridViewCourse"
runat="server"
AutoGenerateColumns="False"
onrowcancelingedit="gridViewCourse_RowCancelingEdit"
onrowdeleting="gridViewCourse_RowDeleting" onrowediting="gridViewCourse_RowEditing"
onrowupdating="gridViewCourse_RowUpdating"
onrowcommand="gridViewCourse_RowCommand"
ShowFooter="True">
<Columns>
<asp:TemplateField>
<EditItemTemplate>
<asp:ImageButton ID="imgbtnUpdate" CommandName="Update" runat="server" ImageUrl="~/Images/update.jpg" ToolTip="Update" Height="20px" Width="20px" />
<asp:ImageButton ID="imgbtnCancel" runat="server" CommandName="Cancel" ImageUrl="~/Images/Cancel.jpg" ToolTip="Cancel" Height="20px" Width="20px" />
</EditItemTemplate>
<ItemTemplate>
<asp:ImageButton ID="imgbtnEdit" CommandName="Edit" runat="server" ImageUrl="~/Images/Edit.jpg" ToolTip="Edit" Height="20px" Width="20px" />
<asp:ImageButton ID="imgbtnDelete" CommandName="Delete" Text="Edit" runat="server" ImageUrl="~/Images/delete.jpg" ToolTip="Delete" Height="20px" Width="20px" />
</ItemTemplate>
<FooterTemplate>
<asp:ImageButton ID="imgbtnAdd" runat="server" ImageUrl="~/Images/AddNewitem.jpg" CommandName="AddNew" Width="30px" Height="30px" ToolTip="Add new User" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Id Cours">
<EditItemTemplate>
<asp:Label ID="lbleditId" runat="server" Text='<%#Eval("CourseId") %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblitemId" runat="server" Text='<%#Eval("CourseId") %>'/>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrId" runat="server"/>
<asp:RequiredFieldValidator ID="rfvId" runat="server" ControlToValidate="txtftrId" Text="*" ValidationGroup="validaiton"/>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Cours">
<EditItemTemplate>
<asp:TextBox ID="txtCours" runat="server" Text='<%#Eval("CourseName") %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblCours" runat="server" Text='<%#Eval("CourseName") %>'/>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrCours" runat="server"/>
<asp:RequiredFieldValidator ID="rfvCours" runat="server" ControlToValidate="txtftrCours" Text="*" ValidationGroup="validaiton"/>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Prix">
<EditItemTemplate>
<asp:TextBox ID="txtPrix" runat="server" Text='<%#Eval("Price") %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblPrix" runat="server" Text='<%#Eval("Price") %>'/>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrPrix" runat="server"/>
<asp:RequiredFieldValidator ID="rfvPrix" runat="server" ControlToValidate="txtftrPrix" Text="*" ValidationGroup="validaiton"/>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Tuteur">
<EditItemTemplate>
<asp:TextBox ID="txtTuteur" runat="server" Text='<%#Eval("Tutor") %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblTuteur" runat="server" Text='<%#Eval("Tutor") %>'/>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrTuteur" runat="server"/>
<asp:RequiredFieldValidator ID="rfvTuteur" runat="server" ControlToValidate="txtftrTuteur" Text="*" ValidationGroup="validaiton"/>
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
这是我的更新方法
Protected Sub gridViewCourse_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
Dim courseId As String = gridViewCourse.DataKeys(e.RowIndex).Values("CourseId").ToString()
Dim courseName As TextBox = DirectCast(gridViewCourse.Rows(e.RowIndex).FindControl("CourseName"), TextBox)
Dim price As TextBox = DirectCast(gridViewCourse.Rows(e.RowIndex).FindControl("Price"), TextBox)
Dim tutor As TextBox = DirectCast(gridViewCourse.Rows(e.RowIndex).FindControl("Tutor"), TextBox)
con.Open()
Dim cmd As New SqlCommand(("update Courses set CourseName='" + courseName.Text & "',Price='" + price.Text & "',Tutor='") + tutor.Text & "' where CourseID=" & courseid, con)
cmd.ExecuteNonQuery()
con.Close()
lblresult.ForeColor = Color.Green
lblresult.Text = " Details Updated successfully"
gridViewCourse.EditIndex = -1
BindCoursesDetails()
End Sub
所以这一行导致我上面提到的错误
Dim courseId As String = gridViewCourse.DataKeys(e.RowIndex).Values("CourseId").ToString()
这一行假设获取CourseId的值以便稍后用于更新
谢谢弗兰克
答案 0 :(得分:1)
您需要设置GridView控件的DataKeyNames
属性。
<asp:GridView ID="gridViewCourse"
runat="server"
AutoGenerateColumns="False"
onrowcancelingedit="gridViewCourse_RowCancelingEdit"
onrowdeleting="gridViewCourse_RowDeleting" onrowediting="gridViewCourse_RowEditing"
onrowupdating="gridViewCourse_RowUpdating"
onrowcommand="gridViewCourse_RowCommand"
datakeynames="CourseId"
ShowFooter="True">
编辑:(来自评论)
您的更新声明无效。
Dim sql="UPDATE Courses set CourseName=@CourseName,Price=@Price,Tutor=@Tutor Where CourseID=@CourseID"
cmd=New SqlCommand(sql,con)
cmd.Parameters.Add("@CourseName",SqlDbType.VarChar,30).Value=courseName.Text
cmd.Parameters.Add("@Price",SqlDbType.VarChar,20).Value=price.Text
cmd.Parameters.Add("@Tutor",SqlDbType.VarChar,30).Value=tutor.Text
cmd.Parameters.Add("@CourseID",SqlDbType.VarChar,10).Value=courseid
con.Open()
cmd.ExecuteNonQuery()
cn.Close();