Question

我只是以编程方式使用DataGrid。

 Public Class MyOwnDataGrid
    Inherits MyBaseClass

    Private DataControl As New WebControls.DataGrid
    Public Property DataSource as DataTable = Nothing

    Public Sub New()
        AddHandler Me.DataControl.ItemCommand, AddressOf Me.DataGrid_ItemCommand
        Me.DataControl.AutoGenerateColumns = False
    End Sub
 End Class

在Page_Load上我绑定DataSource并添加列。

Protected Overrides Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
  'I have to hold the DataSource in a Session variable because after PostBack is the DataSource property nothing
  If (Not (Me.DataSource Is Nothing) And Not (Me.IsPostBack)) Then Session("DataSource") = Me.DataSource

  If (Not (Session(Me.DataSourceSessionName) Is Nothing)) Then
    Me.DataControl.DataSource = Session("DataSource")
    Me.DataControl.DataSource.AcceptChanges()
  End If

  'add the columns with content

  'add the columns for Actions

  Dim oColumn As New TemplateColumn
  oColumn.ItemTemplate = New ActionColumn With {.Control = New WebControls.ImageButton With {.SkinID = "Edit", .ToolTip = "Edit", .CommandName = "Edit"}}
  oColumn.EditItemTemplate = New ActionColumn With {.Control = New WebControls.ImageButton With {.SkinID = "Update", .ToolTip = "Apply", .CommandName = "Update"}}
  oColumn.FooterTemplate = New ActionColumn With {.Control = New WebControls.ImageButton With {.SkinID = "Insert", .ToolTip = "Add", .CommandName = "Insert"}}
  Me.DataControl.Columns.Add(oColumn)

  oColumn = New TemplateColumn
  oColumn.ItemTemplate = New ActionColumn With {.Control = New WebControls.ImageButton With {.SkinID = "Delete", .ToolTip = "Delete", .CommandName = "Delete"}}
  oColumn.EditItemTemplate = New ActionColumn With {.Control = New WebControls.ImageButton With {.SkinID = "Cancel", .ToolTip = "Cancel", .CommandName = "Cancel"}}
  Me.DataControl.Columns.Add(oColumn)

  'Bind the DataSource at every PostBack because otherwise the DataSource is empty and the control will be hidden

  Me.DataControl.DataBind()
End Sub

Private Class ActionColumn
  Implements System.Web.UI.ITemplate

  Public Property Control As WebControls.ImageButton = Nothing

  Public Sub InstantiateIn(ByVal container As System.Web.UI.Control) Implements System.Web.UI.ITemplate.InstantiateIn
    If (Not (Me.Control Is Nothing)) Then container.Controls.Add(Me.Control.Clone)
  End Sub
End Class

我的问题是ItemCommand事件是随机发生的。

Private Sub DataGrid_ItemCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs)
  Select Case e.CommandName.ToUpper
    Case "Edit".ToUpper 
      'do something
    Case "Cancel".ToUpper 
      'do something
    Case "Update".ToUpper 
      'do something
    Case "Delete".ToUpper 
      'do something
    Case Else
  End Select
End Sub

如果我按下编辑或删除按钮，它可以正常工作。使用“编辑”按钮，在编辑模式下设置一行，如果我按下按钮，则会出现奇怪的行为。可以使用“应用”和“取消”按钮。如果我在Apply按钮上按下它们，将使用Delete按钮，如果我按下Cancel按钮，ItemCommand事件不会被触发，但该行不再处于编辑模式。

我的错误在哪里？我怎么了，这不能正常工作？如果我在标记中创建列，它可以正常工作。但在我的情况下并不是所有服务器端。

感谢您的回复。

Answer 1

我可以在bindGrid()上page.ispostback之后调用page_load方法，如下所示：

protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack)
        {
            return;
        }
       BindGrid();
    }

检查this post。

ASP.NET DataGrid ItemCommand事件的奇怪行为

1 个答案: