我是vb.net aspx编程的新手。我有一个像下面的示例代码,它在同一行的gridview单元格中创建15个文本框控件。 我有一个按钮将文本框中的值保存到数据库。
Protected Sub MaliyetGrid_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles MaliyetGrid.RowDataBound
txtPrimVergiKesinti As New TextBox()
Dim txtPrimVergiKesintiValue as String
txtPrimVergiKesinti.ID = "txtPrimVergiKesinti"
txtPrimVergiKesinti.Width = 45
txtPrimVergiKesinti.Font.Size = "10"
txtPrimVergiKesinti.CssClass = "auto-style3"
txtPrimVergiKesinti.TextMode = TextBoxMode.Number
txtPrimVergiKesinti.Text = TryCast(e.Row.DataItem, DataRowView).Row("primdenvergioran").ToString()
e.Row.Cells(14).Controls.Add(txtPrimVergiKesinti)
End Sub
当我单击“保存”按钮时,我想获取每个文本框的值。为此,我编写了以下代码。
Protected Sub SaveButton_Click(sender As Object, e As EventArgs) Handles SaveButton.Click
txtPrimVergiKesintiValue = CType(Me.MaliyetGrid.FindControl("txtPrimVergiKesinti"), TextBox).Text
End Sub
它总是返回错误:{"Object reference not set to an instance of an object."}
。
如何获取文本框的值以保存到日期库中。
谢谢..
我刚刚更改了以下代码并仍然遇到相同的错误..
Dim txtYear As New TextBox()
Dim txtMonth As New TextBox()
Dim txtKidemOran As New TextBox()
Dim txtMaasOran As New TextBox()
Dim txtNicelikOran As New TextBox()
Dim txtSatisPrimOran As New TextBox()
Dim txtDestekPrimOran As New TextBox()
Dim txtVergiOran As New TextBox()
Dim txtTeamLiderPrimOran As New TextBox()
Dim txtSatisciPrimOran As New TextBox()
Dim txtSatiscidanTLyePrimOran As New TextBox()
Dim txtYukTakipPrimOran As New TextBox()
Dim txtBeklenenKur As New TextBox()
Dim txtGercekKur As New TextBox()
Dim txtPrimVergiKesinti As New TextBox()
Protected Sub MaliyetGrid_RowCreated(sender As Object, e As GridViewRowEventArgs) Handles MaliyetGrid.RowCreated
Select Case e.Row.RowType
Case DataControlRowType.DataRow
txtYear.ID = "txtYear"
txtYear.Width = 45
txtYear.Font.Size = "10"
txtYear.CssClass = "auto-style3"
txtYear.TextMode = TextBoxMode.Number
e.Row.Cells(0).Controls.Add(txtYear)
txtMonth.ID = "txtMonth"
txtMonth.Width = 45
txtMonth.Font.Size = "10"
txtMonth.CssClass = "auto-style3"
txtMonth.TextMode = TextBoxMode.Number
e.Row.Cells(1).Controls.Add(txtMonth)
txtKidemOran.ID = "txtKidemOran"
txtKidemOran.Width = 45
txtKidemOran.Font.Size = "10"
txtKidemOran.CssClass = "auto-style3"
txtKidemOran.TextMode = TextBoxMode.Number
e.Row.Cells(2).Controls.Add(txtKidemOran)
txtMaasOran.ID = "txtMaasOran"
txtMaasOran.Width = 45
txtMaasOran.Font.Size = "10"
txtMaasOran.CssClass = "auto-style3"
txtMaasOran.TextMode = TextBoxMode.Number
e.Row.Cells(3).Controls.Add(txtMaasOran)
txtNicelikOran.ID = "txtNicelikOran"
txtNicelikOran.Width = 45
txtNicelikOran.Font.Size = "10"
txtNicelikOran.CssClass = "auto-style3"
txtNicelikOran.TextMode = TextBoxMode.Number
e.Row.Cells(4).Controls.Add(txtNicelikOran)
txtSatisPrimOran.ID = "txtSatisPrimOran"
txtSatisPrimOran.Width = 45
txtSatisPrimOran.Font.Size = "10"
txtSatisPrimOran.CssClass = "auto-style3"
txtSatisPrimOran.TextMode = TextBoxMode.Number
e.Row.Cells(5).Controls.Add(txtSatisPrimOran)
txtDestekPrimOran.ID = "txtDestekPrimOran"
txtDestekPrimOran.Width = 45
txtDestekPrimOran.Font.Size = "10"
txtDestekPrimOran.CssClass = "auto-style3"
txtDestekPrimOran.TextMode = TextBoxMode.Number
e.Row.Cells(6).Controls.Add(txtDestekPrimOran)
txtVergiOran.ID = "txtVergiOran"
txtVergiOran.Width = 45
txtVergiOran.Font.Size = "10"
txtVergiOran.CssClass = "auto-style3"
txtVergiOran.TextMode = TextBoxMode.Number
e.Row.Cells(7).Controls.Add(txtVergiOran)
txtTeamLiderPrimOran.ID = "txtTeamLiderPrimOran"
txtTeamLiderPrimOran.Width = 45
txtTeamLiderPrimOran.Font.Size = "10"
txtTeamLiderPrimOran.CssClass = "auto-style3"
txtTeamLiderPrimOran.TextMode = TextBoxMode.Number
e.Row.Cells(8).Controls.Add(txtTeamLiderPrimOran)
txtSatisciPrimOran.ID = "txtSatisciPrimOran"
txtSatisciPrimOran.Width = 45
txtSatisciPrimOran.Font.Size = "10"
txtSatisciPrimOran.CssClass = "auto-style3"
txtSatisciPrimOran.TextMode = TextBoxMode.Number
e.Row.Cells(9).Controls.Add(txtSatisciPrimOran)
txtSatiscidanTLyePrimOran.ID = "txtSatiscidanTLyePrimOran"
txtSatiscidanTLyePrimOran.Width = 45
txtSatiscidanTLyePrimOran.Font.Size = "10"
txtSatiscidanTLyePrimOran.CssClass = "auto-style3"
txtSatiscidanTLyePrimOran.TextMode = TextBoxMode.Number
e.Row.Cells(10).Controls.Add(txtSatiscidanTLyePrimOran)
txtYukTakipPrimOran.ID = "txtYukTakipPrimOran"
txtYukTakipPrimOran.Width = 45
txtYukTakipPrimOran.Font.Size = "10"
txtYukTakipPrimOran.CssClass = "auto-style3"
txtYukTakipPrimOran.TextMode = TextBoxMode.Number
e.Row.Cells(11).Controls.Add(txtYukTakipPrimOran)
txtBeklenenKur.ID = "txtBeklenenKur"
txtBeklenenKur.Width = 45
txtBeklenenKur.Font.Size = "10"
txtBeklenenKur.CssClass = "auto-style3"
txtBeklenenKur.TextMode = TextBoxMode.Number
e.Row.Cells(12).Controls.Add(txtBeklenenKur)
txtGercekKur.ID = "txtGercekKur"
txtGercekKur.Width = 45
txtGercekKur.Font.Size = "10"
txtGercekKur.CssClass = "auto-style3"
txtGercekKur.TextMode = TextBoxMode.Number
e.Row.Cells(13).Controls.Add(txtGercekKur)
txtPrimVergiKesinti.ID = "txtPrimVergiKesinti"
txtPrimVergiKesinti.Width = 45
txtPrimVergiKesinti.Font.Size = "10"
txtPrimVergiKesinti.CssClass = "auto-style3"
txtPrimVergiKesinti.TextMode = TextBoxMode.Number
e.Row.Cells(14).Controls.Add(txtPrimVergiKesinti)
End Select
End Sub
Protected Sub MaliyetGrid_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles MaliyetGrid.RowDataBound
Try
If e.Row.RowType = DataControlRowType.DataRow Then
Dim txtExpectedCost As New TextBox()
txtExpectedCost.ID = "txtExpectedCost"
txtExpectedCost.Width = 50
txtExpectedCost.Font.Size = "8"
txtExpectedCost.TextMode = TextBoxMode.Number
txtExpectedCost.CssClass = "auto-style3"
Select Case TreeView1.SelectedValue
Case "P1"
If kopyaParam = True Then
txtYear.Text = primYil.SelectedValue
Else
txtYear.Text = TryCast(e.Row.DataItem, DataRowView).Row("paramyear").ToString()
End If
txtYear.Enabled = False
If kopyaParam = True Then
txtMonth.Text = primAy.SelectedValue
Else
txtMonth.Text = TryCast(e.Row.DataItem, DataRowView).Row("parammonth").ToString()
End If
txtMonth.Enabled = False
txtKidemOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("kidemoran").ToString()
txtMaasOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("maasoran").ToString()
txtNicelikOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("nicelikoran").ToString()
txtSatisPrimOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("satisadagitilacakoran").ToString()
txtDestekPrimOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("destegedagitilacakoran").ToString()
txtVergiOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("ayrilacakvergi").ToString()
txtTeamLiderPrimOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("takimlideriprimoran").ToString()
txtSatisciPrimOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("satisciprimoran").ToString()
txtSatiscidanTLyePrimOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("satistantakimliderineprimoran").ToString()
txtYukTakipPrimOran.Text = TryCast(e.Row.DataItem, DataRowView).Row("yuktakipprimoran").ToString()
If kopyaParam = True Then
txtBeklenenKur.Text = ""
Else
txtBeklenenKur.Text = TryCast(e.Row.DataItem, DataRowView).Row("beklenenkur").ToString()
End If
If kopyaParam = True Then
txtGercekKur.Text = ""
Else
txtGercekKur.Text = TryCast(e.Row.DataItem, DataRowView).Row("gerceklesenkur").ToString()
End If
txtPrimVergiKesinti.Text = TryCast(e.Row.DataItem, DataRowView).Row("primdenvergioran").ToString()
If txtKidemOran.Text <> "" Then
CopyPrevious.Visible = False
SaveButton.Visible = True
Else
CopyPrevious.Visible = True
SaveButton.Visible = False
End If
kopyaParam = False
Case "P2", "P3"
txtExpectedCost.Text = "" 'TryCast(e.Row.DataItem, DataRowView).Row("GVMATRAH").ToString()
e.Row.Cells(9).Controls.Add(txtExpectedCost)
Case "P4", "P5"
txtExpectedCost.Text = "" 'TryCast(e.Row.DataItem, DataRowView).Row("GVMATRAH").ToString()
e.Row.Cells(3).Controls.Add(txtExpectedCost)
End Select
End If
Catch ex As Exception
Response.Write("<script>alert('" & Err.Description & "')</script>")
End Try
End Sub
Protected Sub SaveButton_Click(sender As Object, e As EventArgs) Handles SaveButton.Click
Dim txtPrimVergiKesintiValue As String
txtPrimVergiKesintiValue = CType(Me.MaliyetGrid.FindControl("MaliyetGrid_txtPrimVergiKesinti_0"), TextBox).Text
Response.Write("<script>alert('" & txtPrimVergiKesinti.Text & "')</script>")
End Sub
答案 0 :(得分:0)
您必须使用与以前相同的ID在每个回发上重新创建动态创建的控件。我建议使用不同的方法,将它们添加到RowCreated
中,因为只有在对网格进行数据绑定时才会在每次回发时执行RowDataBound
。
Protected Sub MaliyetGrid_RowCreated(sender As Object, e As GridViewRowEventArgs) Handles MaliyetGrid.RowCreated
Select Case e.Row.RowType
Case DataControlRowType.DataRow
Dim txtPrimVergiKesinti As New TextBox()
txtPrimVergiKesinti.ID = "txtPrimVergiKesinti"
txtPrimVergiKesinti.Width = 45
txtPrimVergiKesinti.Font.Size = New FontUnit(10)
txtPrimVergiKesinti.CssClass = "auto-style3"
txtPrimVergiKesinti.TextMode = TextBoxMode.Number
e.Row.Cells(14).Controls.Add(txtPrimVergiKesinti)
End Select
End Sub
请注意,如果您只想将e.Row.RowType
添加到textBox
而不是添加到页眉和页脚,则应检查DataItems
。
您无法访问RowCreated
中的数据源,只能访问RowDataBound
中的数据源。因此,您需要在Text
中设置TextBox
的{{1}}:
RowDataBound
您在保存按钮点击事件中获得了例外,因为Protected Sub MaliyetGrid_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles MaliyetGrid.RowDataBound
Select Case e.Row.RowType
Case DataControlRowType.DataRow
Dim txtPrimVergiKesinti = DirectCast(e.Row.FindControl("txtPrimVergiKesinti"), TextBox)
Dim row As DataRow = DirectCast(e.Row.DataItem, DataRowView).Row
txtPrimVergiKesinti.Text = row.Field(Of String)("primdenvergioran")
End Select
End Sub
使用的是GridView
。这不起作用,因为网格包含多个FindControl
,每行包含此TextBox。实际上GridViewRows
是GridViewRow
。所以你必须使用:
NamingContainer