为什么 GridView 不显示 Paging Index Changed 上的数据？

Question

我有一个 GridView，当我单击“生成”按钮时它会显示特定的数据和记录。

我的问题是，当我点击 GridView 列表的下一页时，Gridview 将丢失，我不认为数据也会丢失，我猜 GirdView 只是不显示它。

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，我尝试了所有我知道的解决这个问题的方法，我也在互联网上搜索了一个解决方案，但没有成功。所以我希望有人能告诉我为什么点击下一页后GridView不显示。

这是 Page_Load

的代码

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 GridView1_PageIndexChanging

的代码

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 BindGridView

的代码

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

我也试过把这段代码放在Page_Load

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

但是结果也有问题，点击下一页显示的是GridView数据列表，点击生成按钮时是这样的

或者像这样

请帮我解决这个问题。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

然后我将 GridView1.Visible = True 放入 GridView1_PageIndexChanging，当我点击下一页时，即使它已经获取了数据，它仍然显示没有找到记录。

Answer 1

我做这件事已经有一段时间了，谢天谢地我已经做了。我花了很多不同的方法和解决方案，但对我没有任何帮助，但谢天谢地，现在这个是正确的。

Page_Load

的代码

 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

GridView1_PageIndexChanging

的代码

 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 中用于在 DropDownList 中再次选择时显示记录，在 PageIndexChanging 中用于在单击下一页时显示记录。

为什么 GridView 不显示 Paging Index Changed 上的数据？

Why does GridView not showing data on Paging Index Changed?

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asp.net

gridview

page-index-changed