Asp.net 在gridview中添加新行

更新

从这里我绑定了gridview

Public Function uplif() As DataTable
        Dim dt As New DataTable()
        gridvieew1.Visible = True

        Try

            dt.Columns.AddRange(New DataColumn(1) {New DataColumn("ID", GetType(Integer)),
                                                   New DataColumn("Name", GetType(String))}
            Dim Content As String = Request.Form(textbox1.UniqueID)
            For Each row As String In Content .Split(ControlChars.Lf)
                If Not String.IsNullOrEmpty(row) Then
                    dt.Rows.Add()
                    Dim i As Integer = 0
                    For Each cell As String In row.Split(ControlChars.Tab)
                        If i > 1 Then
                            labelmessage.Text = "More than 2 columns not Allowed !!"
                            textbox1.Text = ""
                        Else
                            If cell.Trim() = "" Then
                                cell = "0"
                            End If
                            dt.Rows(dt.Rows.Count - 1)(i) = cell
                            i += 1
                        End If
                    Next
                End If
            Next
             gridvieew1.DataSource = dt
             gridvieew1.DataBind()

        Catch Ex As Exception
            labelmessage.CssClass = "alertNo"
            labelmessage.Text = Ex.Message
        End Try
        Return dt
    End Function

  Protected Sub PasteToGridView(sender As Object, e As EventArgs)
        uplif()

    End Sub

现在，当我尝试像这样添加新行时

Private Sub AddNewRowToGrid()
        Dim dt As DataTable = uplif()
        Dim NewRow As DataRow = dt.NewRow()
        dt.Rows.Add(NewRow)
         gridvieew1.DataSource = dt
         gridvieew1.DataBind()
    End Sub

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        AddNewRowToGrid()
    End Sub

ID Name
1  abc
2  def
(here new empty row when click on button )

这显示了与添加新行和替换gridview中已有的先前数据相同的输出，同时也显示了一个错误 对象引用未设置为对象的实例

单击“添加新行”后

ID Name

像这样我想去哪里

Private Sub AddNewRowToGrid()
        Dim dt As DataTable = uplif()
        Dim NewRow As DataRow = dt.NewRow()
        dt.Rows.Add(NewRow)
         gridvieew1.DataSource = dt
         gridvieew1.DataBind()
    End Sub

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        AddNewRowToGrid()
    End Sub

ID Name
1  abc
2  def
(here new empty row when click on button )

---

正如在你的帖子评论中指出的，问题在于以下两行：

Dim dt As New DataTable()
...
gridview1.DataSource = dt

这将创建一个全新的

数据表

，并将网格视图绑定到它。您不会复制数据，也不会更改现有gridview的表

---

这里正确的修复方法是从gridview的数据源获取

DataTable

，并对其进行所需的任何更改。不要创建新的

数据表

获取已分配的数据源，然后添加行。不要添加列，因为它已经存在于数据源中

 Private Sub AddNewRowToGrid()
        Dim dt As gridview1.DataSource       
        Dim NewRow As DataRow = dt.NewRow()
        dt.Rows.Add(NewRow)
        gridview1.DataSource = dt
        gridview1.DataBind()
    End Sub

 Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    AddNewRowToGrid()
End Sub

---

这是vb代码。为什么在这里添加c#标记？每次单击按钮1时，都会创建一个全新的数据表，并将其绑定到DGV

如果dt.Columns.Count=0，则不需要

，因为它始终为真。因此，如果dt.Columns.Count=0，则删除此行？不要创建新的数据表。使用现有的请检查更新问题是的，我这样做了，我使用现有的数据表，但这显示相同的请检查更新问题这显示错误。。错误126未定义类型“gridview1.DataSource”。