Question

基本上，我有一个显示从数据库中提取的数据的GridView，该页面还有一个过滤器按钮，单击列表上的工作人员将更改SQL语句，以便只选择该工作人员。 / p>

在GridView内，每一行都有一个按钮，它实际上将AppointmentID导出到变量中，以便显示更多信息。

但是，按下过滤器按钮后，GridView内容会更改GridView中的按钮，不再“导出”正确的ID。

过滤器按钮的标记：

<div class="dropdown"> 
    <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown"  id="dropdownstaff"><asp:Label runat="server" ID="lblDropdownstaff" Text="All Stylists"></asp:Label>
        <span class="caret"></span>
    </button>
    <ul class="dropdown-menu" id="ulStaffSelect">
        <li><asp:Button runat="server" Text="All Stylists" ID="lstStaffSelect1"/></li>
        <li><asp:Button runat="server" Text="Elaine" ID="lstStaffSelect2"/></li>
        <li><asp:Button runat="server" Text="Dawn" ID="lstStaffSelect3"/></li>
    </ul>
</div>

GridView的标记（注意注释掉的LinkedButton - 它的行为与普通按钮的行为相同，“UseSubmitBehaviour”设置为false）：

<asp:GridView ID="Staffgv" runat="server" AutoGenerateColumns="false" AllowPaging="true" PageSize="20" OnPageIndexChanging="Staffgv_PageIndexChanging" BackColor="#f9f9f9" CssClass="gvStyle" OnRowCommand="Staffgv_RowCommand">
    <HeaderStyle CssClass="gvHeadStyle" />
    <PagerSettings  Mode="NextPreviousFirstLast" FirstPageText="<<" PreviousPageText="<" NextPageText=">" LastPageText=">>" />
    <AlternatingRowStyle BackColor="#ffffff"  CssClass="gvAlternatingClass"/>
    <Columns>
        <asp:TemplateField HeaderText="Start" InsertVisible="False" SortExpression="DateTimeStart">
            <HeaderStyle Width="70px"   CssClass="hdrGvStart"/>
            <ItemTemplate>
                <asp:Label ID="lblDateTimeStart" runat="server" Text='<%# Bind("DateTimeStart", "{0:t}") %>'></asp:Label>
            </ItemTemplate>      
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Finish" SortExpression="DateTimeEnd">
            <HeaderStyle Width="70px"   CssClass="hdrGvFinish"/>
            <ItemTemplate>
                <asp:Label ID="lblDateTimeEnd" runat="server" Text='<%# Bind("DateTimeEnd", "{0:t}") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Forename" SortExpression="Forename">
            <HeaderStyle Width="140px"  CssClass="hdrGvForename"/>
            <ItemTemplate>
                <asp:Label ID="lblForename" runat="server" Text='<%# Bind("Forename") %>'></asp:Label>
            </ItemTemplate>               
        </asp:TemplateField>  
        <asp:TemplateField HeaderText="Surname" SortExpression="Surname">
            <HeaderStyle Width="140px"   CssClass="hdrGvSurname"/>
            <ItemTemplate>
                <asp:Label ID="lblSurname" runat="server" Text='<%# Bind("Surname") %>'></asp:Label>
            </ItemTemplate>               
        </asp:TemplateField>                                              
        <asp:TemplateField>
            <HeaderStyle CssClass="gvHeaderEdit" />
            <ItemTemplate>
                <asp:Button ID="Btnapptid" runat="server" Text="____"  CssClass="btnGVEdit" CommandName="FillStaffTables" CommandArgument='<%# Bind("AppointmentID") %>' UseSubmitBehavior="false"/>
                <%--<asp:LinkButton ID="Btnapptid" runat="server" Text="____"  CssClass="btnGVEdit" CommandName="FillStaffTables" CommandArgument='<%# Bind("AppointmentID") %>'  Width="48px" Height="48px"/>--%>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

VB代码：

Dim connString As String = "Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename='C:\Users\me\Documents\Visual Studio 2015\Datebases\DB.mdf';Integrated Security=True;Connect Timeout=30"

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    lblStaffHead.Text = "You are logged in as " & StaffMemberName
    selectedStaffMember = "Salon"
    generatePage(selectedStaffMember)
End Sub

Protected Sub lstStaffSelect1_Click(ByVal sender As Object, e As EventArgs) Handles lstStaffSelect1.Click
    lblDropdownstaff.Text = "All Stylists"
    selectedStaffMember = "Salon"

    generatePage(selectedStaffMember)
End Sub

Protected Sub lstStaffSelect2_Click(ByVal sender As Object, e As EventArgs) Handles lstStaffSelect2.Click
    lblDropdownstaff.Text = "Elaine"
    selectedStaffMember = "Elaine"

    generatePage(selectedStaffMember)
End Sub

Protected Sub lstStaffSelect3_Click(ByVal sender As Object, e As EventArgs) Handles lstStaffSelect3.Click
    lblDropdownstaff.Text = "Dawn"
    selectedStaffMember = "Dawn"

    generatePage(selectedStaffMember)
End Sub

Function findIndex(ByVal selectedStaffMember As String)
    Select Case selectedStaffMember
        Case "Salon"
            staffdropdownindex = 0
        Case "Elaine"
            staffdropdownindex = 1
        Case "Dawn"
            staffdropdownindex = 2
        Case Else
            staffdropdownindex = 3
    End Select
    staffindex = staffdropdownindex
    Return staffindex
End Function

Protected Sub generatePage(ByVal selectedStaffMember As String)
    staffindex = findIndex(selectedStaffMember)

    Dim sqlCommandString As String
    If staffindex <> 0 Then

        sqlCommandString = "SELECT [Appointments].[DateTimeStart], [Appointments].[DateTimeEnd], [Appointments].[AppointmentID], [CustomerData].[Forename], [CustomerData].[Surname] " &
                           "FROM [Appointments] " &
                           "INNER JOIN [CustomerData] " &
                           "ON [CustomerData].[CustomerID] = [Appointments].[CustomerID] " &
                           "WHERE [Appointments].[HairdresserID] = " & staffindex &
                           "ORDER BY [Appointments].[DateTimeStart] ASC"

    ElseIf staffindex = 0 Then
        sqlCommandString = "SELECT [Appointments].[DateTimeStart], [Appointments].[DateTimeEnd], [Appointments].[AppointmentID], [CustomerData].[Forename], [CustomerData].[Surname] " &
                           "FROM [Appointments] " &
                           "INNER JOIN [CustomerData] " &
                           "ON [CustomerData].[CustomerID] = [Appointments].[CustomerID] " &
                           "ORDER BY [Appointments].[DateTimeStart] ASC"

    End If

    ds_estrella.Clear()
    GridViewConnection(sqlCommandString)
End Sub

Protected Sub GridViewConnection(ByVal sqlCommandString As String)
    Staffgv.DataSource = Nothing
    Staffgv.DataBind()

    Dim dbConn As New SqlConnection(connString)

    Try
        dbConn.Open()

        da_estrella = New SqlDataAdapter(sqlCommandString, dbConn)
        da_estrella.Fill(ds_estrella, "StaffView")

        Dim icount As Integer = ds_estrella.Tables(0).Rows.Count
        Staffgv.DataSource = ds_estrella

        If ds_estrella.Tables(0).Rows.Count > 0 Then
            Staffgv.DataSource = ds_estrella
            Staffgv.DataBind()
        Else
            Staffgv.DataSource = ds_estrella
            Staffgv.DataBind()
            Dim columncount As Integer = Staffgv.Rows(0).Cells.Count

            'No data found in this case
        End If

        dbConn.Close()
    Catch ex As Exception
        lblDropdownstaff.Text = "FAILED"
    End Try
End Sub

Protected Sub Staffgv_PageIndexChanging(ByVal sender As Object, e As GridViewPageEventArgs) Handles Staffgv.PageIndexChanging
    Staffgv.PageIndex = e.NewPageIndex
End Sub

Protected Sub Staffgv_RowCommand(ByVal sender As Object, e As GridViewCommandEventArgs)
    If (e.CommandName = "FillStaffTables") Then
        txtAppointmentID.Text = e.CommandArgument
    End If
End Sub

Answer 1

花了一些工作，但我使用了你的代码并构建了一个正在运行的web应用程序，所以我可以帮助调试它。您可能要做的第一件事是将以下行添加为Page_Load

中的第一行

If Me.IsPostBack Then Exit Sub

这将使您的整个Page_Load块仅运行一次，以便gridview不会继续返回其原始状态。

例如，请点击＆＃34; Elaine＆＃34;按钮，然后单击＆＃34; ____＆＃34; gridview内的按钮。这将导致整个gridview返回其原始状态，但现在它应该保持过滤的gridview存在。

您可以在Me.IsPostBack内向上/向下移动上述Page_Load行，只需知道其下方的任何代码只会运行一次：首次加载页面时。

您应该做的第二件事是在Page_Load

中添加另一行

txtAppointmentID.Text = String.Empty

应将放在 Me.IsPostBack行之上。当页面重新加载时，这将清除文本框，以便当单击另一个按钮时，所述文本框不会保留其中的先前/陈旧值。

最后，在vb文件的最顶部，添加以下行（如果您还没有）是一个好习惯

Option Strict On
Option Explicit On

这些选项会带来更多错误，这些错误通常很容易修复，如果保持不变，它们有时会导致非常微妙的错误/问题很难追查。这些选项通常可以帮助人们编写更好的代码。

来自ASP.Net中GridView的奇怪行为

1 个答案: