データベースから入力されるグリッドビューにドロップダウンリストがあります。
このドロップダウンリストの横にもテキストボックスがあります。
ユーザーが探しているオプションがドロップダウンにない場合は、その値をテキスト ボックスに入力します。データベースに送信されると、ドロップダウン リストに表示されます。
次のエラーが発生しています。
Unable to cast object of type 'ASP.addtoroster_aspx' to type 'System.Web.UI.WebControls.GridViewRow'.
エラーは次の行にあります。
Dim parentRow As GridViewRow = DirectCast(button.NamingContainer, GridViewRow)
マークアップでイメージボタンを使用してデータベースに送信しているため、このエラーが発生すると思います。
<asp:ImageButton ID="btnSave" runat="server" ImageUrl="images/save.png"
onmouseout="this.src='images/save.png'"
onmouseover="this.src='images/save.png'"
OnClick="btnSave_Click" alt="Save Data" />
これを解決する方法はありますか？
これは vb ですが、可能であれば c# での解決策を歓迎します。
ありがとうございました！
Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs)
' Try
SetRowData()
Dim table As DataTable = TryCast(ViewState("CurrentTable"), DataTable)
If table IsNot Nothing Then
For Each row As DataRow In table.Rows
Dim txLName As String = TryCast(row.ItemArray(1), String)
Dim txName As String = TryCast(row.ItemArray(2), String)
Dim txEmail As String = TryCast(row.ItemArray(3), String)
Dim txRole As String = TryCast(row.ItemArray(4), String)
Dim txPhone As String = TryCast(row.ItemArray(5), String)
Dim drpEmpl As String = TryCast(row.ItemArray(6), String)
Dim txVIP As String = TryCast(row.ItemArray(7), String)
Dim drpLCB As String = TryCast(row.ItemArray(8), String)
'Find the button
Dim button As Button = DirectCast(sender, Button)
'Find parent row
Dim parentRow As GridViewRow = DirectCast(button.NamingContainer, GridViewRow)
'find DropDownlist and textbox
Dim ddl As DropDownList = TryCast(parentRow.FindControl("txtLoginName"), DropDownList)
Dim txtNewUser As TextBox = TryCast(parentRow.FindControl("txtNewUser"), TextBox)
If txtNewUser IsNot Nothing AndAlso ddl IsNot Nothing Then
'add new listitem here
Dim customItem As New ListItem(txtNewUser.Text, txtNewUser.Text)
ddl.Items.Add(customItem)
End If
Dim ddlvalue As String = ""
Dim idx As Integer = grvStudentDetails.EditIndex
If drpEmpl = "Other" Then
ddlvalue = DirectCast(grvStudentDetails.FindControl("txtOther"), TextBox).Text
' Else
' ddlvalue = drpEmpl
End If
If txLName IsNot Nothing OrElse txLName IsNot Nothing OrElse txEmail IsNot Nothing OrElse txRole IsNot Nothing OrElse txPhone IsNot Nothing OrElse drpEmpl IsNot Nothing OrElse txVIP IsNot Nothing OrElse drpLCB IsNot Nothing Then
' Response.Write(String.Format("{0} {1} {2} {3} {4} {5} {6} {7} <br/>", txLName, txName, txEmail, txRole, txPhone, drpEmpl, txVIP, drpLCB))
'Try
Dim dateentered As String = DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss")
'Response.Write(dateentered)
'Response.End()
Dim s As String
Dim count As Integer
'If LoginName already exists, alert user
s = "SELECT Count(*) FROM Employee_Roster WHERE login_id = " & txLName
'Response.Write(s)
'Response.End()
Dim connSt As String = ConfigurationManager.ConnectionStrings("allstringconstrng").ConnectionString
Dim connc As New OleDbConnection(connSt)
Dim cmdc As New OleDbCommand(s, connc)
'cmdc.Parameters.AddWithValue("login_id", txtLoginName.SelectedValue)
connc.Open()
' cmdc.ExecuteNonQuery()
count = cmdc.ExecuteScalar()
' Now let's see if we found existing record
If count > 0 Then
'Display some feedback to the user to let them know it was processed
lblResult.ForeColor = System.Drawing.Color.Green
lblResult.Text = "User already is in the Excel Sheet!"
Else
s = "INSERT INTO Employee_Roster(login_id, FullName, Email_Address, Role_Dept,Phone,Employer,VP,entryDate,Notes) VALUES "
s += "('" & txLName & "', '" & txName & "', '" & txEmail & "', '" & txRole & "', '" & txPhone & "', '" & ddlvalue & "','" & txVIP & "','" & dateentered & "', '" & drpLCB & "')"
Response.Write(s)
Response.End()
Dim connStr As String = ConfigurationManager.ConnectionStrings("allstringconstrng").ConnectionString
Dim conn As New OleDbConnection(connStr)
Dim cmd As New OleDbCommand(s, conn)
conn.Open()
cmd.ExecuteNonQuery()
conn.Close()
'Display some feedback to the user to let them know it was processed
lblResult.ForeColor = System.Drawing.Color.Green
lblResult.Text = "Record successfully saved!"
'Clear the form
txLName = ""
txLName = ""
txEmail = ""
txRole = ""
txPhone = ""
txVIP = ""
End If
' Catch
'If the message failed at some point, let the user know
lblResult.ForeColor = System.Drawing.Color.Red
lblResult.Text = "Your record failed to save, please try again."
' End Try
End If
Next
End If
' Catch ex As Exception
'Throw New Exception(ex.Message)
' End Try
End Sub