不正确显示来自querystring关键字的搜索结果

问题描述：

我有一个basicSearch页面可以完美地处理关键字（突出显示搜索结果页面上的关键字），但是当我修改它来处理查询字符串时，它显示所有记录关键字高亮。不正确显示来自querystring关键字的搜索结果

aspx页面：

<form id="form1" runat="server"> 

<div id="mainContent"> 
    <asp:ScriptManager ID="ScriptManager1" runat="server" /> 

    <script type="text/javascript"> 
     function updated() { 
      // close the popup 
      tb_remove(); 

      // refresh the update panel so we can view the changes 
      $('#<%= me.btnRefreshResources.ClientID %>').click(); 
     } 

     function pageLoad(sender, args) { 
      if (args.get_isPartialLoad()) { 
       // reapply the thick box stuff 
       tb_init('a.thickbox'); 
      } 
     } 
    </script> 

    <asp:AccessDataSource ID="AccessDataSource" runat="server" 
     DataFile="~/Dir/search.mdb" 
     SelectCommand="SELECT * FROM [searches] ORDER BY [Title]" 
     FilterExpression="Title like '%{0}%' or LastName like '%{1}%' or FirstName like '%{2}%' or Description like '%{3}%' "> 

     <FilterParameters> 
      <asp:ControlParameter Name="Title" ControlID="txtSearch" PropertyName="Text" /> 
      <asp:ControlParameter Name="LastName" ControlID="txtSearch" PropertyName="Text" /> 
      <asp:ControlParameter Name="FirstName" ControlID="txtSearch" PropertyName="Text" /> 
      <asp:ControlParameter Name="Description" ControlID="txtSearch" PropertyName="Text" /> 
     </FilterParameters> 
    </asp:AccessDataSource> 

    <div id="basicSearch" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
     <b style="font-family: Arial, Helvetica, sans-serif; font-size: 18px">Enter a keyword: </b><asp:TextBox ID="txtSearch" runat="server" Width="300px" Font-Size="18px" />&nbsp;&nbsp; 
     <asp:Button ID="btnBasicSearch" Text="Search" Runat="Server"/>&nbsp;&nbsp; 
     <asp:Button ID="btnBasicClear" Text="Clear" Runat="Server"/><br /><br /> 
    </div> 

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> 
    <ContentTemplate>  
     <asp:Button ID="btnRefreshResources" runat="server" style="display:none" OnClick="Refresh_Click" /> 

    <asp:GridView ID="gvResources" runat="server" DataSourceID="AccessDataSource" CssClass="datagrid" GridLines="None" AutoGenerateColumns="false" AllowSorting="True" PageSize="50" AllowPaging="True" Width="100%" OnPageIndexChanging="gvResources_PageIndexChanging"> <PagerSettings Position="TopAndBottom" /> 
    <Columns> 
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" /> 

    <asp:TemplateField HeaderText="Type" HeaderStyle-HorizontalAlign="Right" SortExpression="Title"> 
     <ItemTemplate> 
      <%# DisplayType(Eval("Book"))%> 
     </ItemTemplate> 
    </asp:TemplateField> 

    <asp:TemplateField HeaderText="Title" SortExpression="Title"> 
    <ItemTemplate> 
     <asp:Label ID="lblTitle" Text='<%# HighlightText(Eval("Title").ToString()) %>' runat="server" /> 
    </ItemTemplate> 
    </asp:TemplateField> 

    <asp:TemplateField HeaderText="Last Name" SortExpression="LastName"> 
    <ItemTemplate> 
     <asp:Label ID="lblLastName" Text='<%# HighlightText(Eval("LastName").ToString()) %>' runat="server" /> 
    </ItemTemplate> 
    </asp:TemplateField> 

    <asp:TemplateField HeaderText="First Name" SortExpression="FirstName"> 
    <ItemTemplate> 
     <asp:Label ID="lblFirstName" Text='<%# HighlightText(Eval("FirstName").ToString()) %>' runat="server" /> 
    </ItemTemplate> 
    </asp:TemplateField> 

    <asp:TemplateField HeaderText="Description"> 
    <ItemTemplate> 
     <asp:Label ID="lblDescription" Text='<%# HighlightText(Eval("Description").ToString()) %>' runat="server" /> 
    </ItemTemplate> 
    </asp:TemplateField> 

    <asp:TemplateField> 
     <ItemTemplate> 
      <a id="btnShowPopup" runat="server" class="thickbox" title='<%# Eval("ID", "Request Resource ID: {0}") %>' href='<%# Eval("ID", "RequestResource.aspx?ID={0}&TB_iframe=true&height=350&width=500&modal=true") %>'>Request This Item</a> </ItemTemplate> 
    </asp:TemplateField> 

    </Columns> 
</asp:GridView> 
</ContentTemplate> 
</asp:UpdatePanel> 
</div> 
</form>

后面的代码：

Partial Class BasicSearch 

Inherits System.Web.UI.Page 

Dim SearchString As String = "" 

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 
    SearchString = Request.QueryString("Keyword") 
End Sub 

Protected Sub Refresh_Click(ByVal sender As Object, ByVal args As EventArgs) 
    ' update the grids contents 
    Me.gvResources.DataBind() 
End Sub 

Function HighlightText(ByVal InputTxt As String) As String 
    If SearchString = "" Then 
     Return InputTxt 
    Else 
     Dim ResultStr As Regex 
     ResultStr = New Regex(SearchString.Replace(" ", "|"), RegexOptions.IgnoreCase) 
     Return ResultStr.Replace(InputTxt, New MatchEvaluator(AddressOf ReplaceWords)) 
    End If 
End Function 

Public Function ReplaceWords(ByVal m As Match) As String 
    Return "<span class=highlight>" + m.ToString + "</span>" 
End Function 

Protected Sub gvResources_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs) 
    gvResources.PageIndex = e.NewPageIndex 
    SearchString = txtSearch.Text 
    gvResources.DataBind() 
End Sub 

Protected Sub btnBasicSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnBasicSearch.Click 
    SearchString = txtSearch.Text 
    Response.Redirect("BasicSearch.aspx?Keyword=" & SearchString) 
End Sub 

Protected Sub btnBasicClear_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnBasicClear.Click 
    txtSearch.Text = "" 
    SearchString = "" 
End Sub 

Protected Function DisplayType(ByVal Book As Boolean) As String 
    If Book Then 
     Return "Book" 
    Else 
     Return "Other" 
    End If 
End Function 
End Class

答

只是一个猜测 - 什么是SearchString当HighlightText功能正在执行的价值？您正在将查询字符串存储在本地页面变量中，该页面变量仅在页面请求执行时存在。

如果HighlightText被调用时没有调用Page_Load（在相同的请求中），SearchString将为空。

不正确显示来自querystring关键字的搜索结果

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