1

当我单击“生成”按钮时，我有一个 GridView 显示特定的数据和记录。

GridView 显示记录

我的问题是，当我单击 GridView 列表的下一页时，Gridview 会丢失，我认为数据也不会丢失，我猜 GridView 只是没有显示它。

索引已更改

你能帮我解决这个问题吗？我不是第一个创建这个网站的人，我尝试了我所知道的所有方法来解决这个问题，我也在互联网上搜索了一个没有运气的解决方案。所以我希望有人能告诉我为什么单击下一页后 GridView 没有显示。

这是代码Page_Load

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    userid = IIf(SessionHandler.UserID = "", User.Identity.Name.ToUpper, SessionHandler.UserID)

    V3Substance.Attributes.Add("onfocus", "javascript:if (this.value=='Substance Cas Number') { this.value = ''; }")
    V3Substance.Attributes.Add("onblur", "javascript:if (this.value=='') { this.value = 'Substance Cas Number'; }")

    If Not Page.IsPostBack Then
        V1Division.DataSource = GetDivision()
        V1Division.DataBind()

        V1BR.Items.Clear()
        V1BR.DataSource = GetBusinessRule(V1Division.Text)
        V1BR.DataBind()

        MultiView1.ActiveViewIndex = 0
        Panel1.DefaultButton = "V1Generate"
    End If
End Sub

这是代码GridView1_PageIndexChanging

Protected Sub GridView1_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GridView1.PageIndexChanging
    Dim dt As DataTable = TryCast(GridView1.DataSource, DataTable)
    GridView1.DataSource = SortTable(dt)

    GridView1.PageIndex = e.NewPageIndex
    GridView1.DataBind()
End Sub

这是代码BindGridView

Private Sub BindGridview(ByVal query As String, ByVal countquery As String)
    ViewState.Add("Query", query)
    ViewState.Add("CountQuery", countquery)

    Dim count As Integer = 0

    If Description.Text = "1" Then
        ValidateFamily(query)
    Else
        DataSource = dbHelper.GetRecordDT(query)
    End If

    count = DataSource.Rows.Count

    'GridView1.DataSource = Nothing
    'GridView1.DataBind()
    'GridView1.PageIndex = 0

    GridView1.DataSource = DataSource
    GridView1.Visible = True
    GridView1.DataBind()

    ExportToExcel.Visible = IIf(count < 1, False, True)
    Panel1.Visible = IIf(count < 1, False, True)
    SetTotalResult(count)
End Sub

我还尝试将此代码放入 Page_Load

If ViewState.Item("Query") <> Nothing Then
    BindGridview(ViewState.Item("Query"), ViewState.Item("CountQuery"))
End If

但结果也是一个问题，当我单击下一页时它显示 GridView 数据列表但是当单击生成按钮时它是这样的

生成1

或者像这样

生成2

请帮我解决一下这个。非常感谢。

更新

好的，所以我把这段代码放在 Page_Load

If ViewState.Item("Query") <> Nothing Then
    BindGridview(ViewState.Item("Query"), ViewState.Item("CountQuery"))
End If

然后GridView1.Visible = True，GridView1_PageIndexChanging当我单击下一页时，即使它已经获取了数据，它也仅显示未找到记录。

4

1 回答 1

1

所以我做这件事已经有一段时间了，谢天谢地我已经做到了。我采取了很多不同的方法和解决方案，但对我没有帮助，但谢天谢地，这个现在是正确的。

代码Page_Load

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
            userid = IIf(SessionHandler.UserID = "", User.Identity.Name.ToUpper, SessionHandler.UserID)

            V3Substance.Attributes.Add("onfocus", "javascript:if (this.value=='Substance Cas Number') { this.value = ''; }")
            V3Substance.Attributes.Add("onblur", "javascript:if (this.value=='') { this.value = 'Substance Cas Number'; }")

            If Not Page.IsPostBack Then
                V1Division.DataSource = GetDivision()
                V1Division.DataBind()

                V1BR.Items.Clear()
                V1BR.DataSource = GetBusinessRule(V1Division.Text)
                V1BR.DataBind()

                MultiView1.ActiveViewIndex = 0
                Panel1.DefaultButton = "V1Generate"

                If ViewState.Item("Query") <> Nothing Then
                    BindGridview(ViewState.Item("Query"), ViewState.Item("CountQuery"))
                End If
            End If
End Sub

代码GridView1_PageIndexChanging

 Protected Sub GridView1_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GridView1.PageIndexChanging
            Dim dt As DataTable = TryCast(GridView1.DataSource, DataTable)
            GridView1.DataSource = SortTable(dt)

            GridView1.PageIndex = e.NewPageIndex
            'GridView1.DataBind()
            If ViewState.Item("Query") <> Nothing Then
                BindGridview(ViewState.Item("Query"), ViewState.Item("CountQuery"))
            End If
End Sub

我加

If ViewState.Item("Query") <> Nothing Then
                    BindGridview(ViewState.Item("Query"), ViewState.Item("CountQuery"))
                End If

在If Not Page.IsPOstBack下拉列表中再次选择时PageIndexChanging显示记录，在单击下一页时显示记录。

于 2017-02-14T00:11:57.557 回答