Question

早上好，如何将此过滤器表达式转换为参数化查询但仍显示在gridview中？现在，如果我搜索％^＆amp;％*，它会崩溃。

C＃：

public static bool IsDate(Object obj)
        {
            string strDate = obj.ToString();
            try
            {
                DateTime dt = DateTime.Parse(strDate);
                if (dt != DateTime.MinValue && dt != DateTime.MaxValue)
                    return true;
                return false;
            }
            catch
            {
                return false;
            }
        }

 protected void BtnWinnersSearch_Click(object sender, EventArgs e)
        {

            string searchText = txtWinnersSearch.Text.Replace("'", "''").Trim();
            bool isDate = IsDate(searchText);

            GridViewWinners.Visible = true;

            if (isDate == true)
            {
                SqlDataSource4.FilterExpression = "dob" + " ='" + Convert.ToDateTime(searchText).ToString("yyyy-MM-dd") + "'";
            }
            else
            {
                SqlDataSource4.FilterExpression = "nickname like '%" + searchText + "%' or username like '%" + searchText +
                    "%' or clubnumber like '%" + searchText + "%' or firstname like '%" +
                    searchText + "%' or lastname like '%" + searchText +
                    "%' or email like '%" + searchText + "%'";
            }
        }

ASP：

<asp:Panel ID="pnlWinners" DefaultButton="BtnWinnersSearch" runat="server" Visible="False">
        <table>
        <tr>
            <td align="center"><b>MANAGE WINNERS</b> - 
            <asp:Button ID="BtnWinnerAdd" runat="server" Text="Add" 
                    onclick="BtnWinnerAdd_Click" /> | 
                <asp:TextBox ID="txtWinnersSearch" runat="server" MaxLength="220"></asp:TextBox>
                    <asp:Button ID="BtnWinnersSearch"
                    runat="server" Text="Search" onclick="BtnWinnersSearch_Click"  />
            </td>
        </tr>
        <tr>
        <td>
                <asp:GridView ID="GridViewWinners" runat="server" AutoGenerateColumns="False" DataKeyNames="PlayerID"
                DataSourceID="SqlDataSource4" 
                EmptyDataText="There are no winners to display." CellPadding="4"
                AllowSorting="True" 
                onsorting="GridViewWinners_Sorting" 
                ForeColor="#333333" 
                Visible="False"
                onselectedindexchanged="GridViewWinners_SelectedIndexChanged" 
                    FooterStyle-Wrap="False" HeaderStyle-Wrap="False" PagerStyle-Wrap="False" 
                    RowStyle-Wrap="False" SelectedRowStyle-Wrap="False" Font-Overline="False" >
                <AlternatingRowStyle BackColor="White" ForeColor="#284775" HorizontalAlign="Center" 
                        VerticalAlign="Middle" Wrap="False" />
                <Columns>
                    <asp:CommandField ShowSelectButton="True"/>
                    <asp:BoundField DataField="PlayerID" HeaderText="PlayerID" InsertVisible="False" 
                        ReadOnly="True" SortExpression="PlayerID" Visible="False" />
                        <asp:BoundField DataField="Nickname" HeaderText="Nickname" 
                        SortExpression="Nickname" ItemStyle-Wrap="False">
                    <ItemStyle Wrap="False" />
                    </asp:BoundField>
                    <asp:BoundField DataField="LastName" HeaderText="Last Name" 
                        SortExpression="LastName" ItemStyle-Wrap="False">
                    <ItemStyle Wrap="False" />
                    </asp:BoundField>
                    <asp:BoundField DataField="FirstName" HeaderText="First Name" 
                        SortExpression="FirstName" />
                    <asp:BoundField DataField="UserName" HeaderText="UserName" 
                        SortExpression="UserName" />
                    <asp:BoundField DataField="ClubNumber" HeaderText="Account Number" 
                        SortExpression="ClubNumber" />
                    <asp:BoundField DataField="Email" HeaderText="Email" 
                        SortExpression="Email" />
                    <asp:BoundField DataField="DOB" HeaderText="D.O.B." 
                        DataFormatString="{0:d}" SortExpression="DOB" />
                </Columns>
                <EditRowStyle BackColor="#999999" />
                <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" 
                        HorizontalAlign="Center" VerticalAlign="Middle" />
                <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
                <RowStyle BackColor="#F7F6F3" ForeColor="#333333" 
                        HorizontalAlign="Center" VerticalAlign="Middle" />
                <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
                <SortedAscendingCellStyle BackColor="#E9E7E2" />
                <SortedAscendingHeaderStyle BackColor="#506C8C" />
                <SortedDescendingCellStyle BackColor="#FFFDF8" />
                <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
            </asp:GridView>
            </td>
            </tr>
            </table>
            </asp:Panel>
             <asp:SqlDataSource ID="SqlDataSource4" runat="server" 
                ConnectionString="****" 
                ProviderName="***" 
                SelectCommand="SELECT [PlayerID], [Nickname], [UserName], [ClubNumber], [FirstName], [Email], [LastName], [DOB] FROM [Players] order by lastname ASC">
            </asp:SqlDataSource>
</asp:Content>

enter image description here

错误：

Like运算符出错：字符串模式'％@＃％$％'无效。

描述：执行期间发生了未处理的异常   当前的网络请求。请查看堆栈跟踪了解更多信息   有关错误的信息以及它在代码中的起源。

异常详细信息：System.Data.EvaluateException：Like中的错误   operator：字符串模式'％@＃％$％'无效。

来源错误：

执行期间生成了未处理的异常   当前的网络请求。有关的来源和位置的信息   可以使用下面的异常堆栈跟踪来识别异常。

堆栈追踪：

[EvaluateException：Like运算符出错：字符串模式   '％@＃％$％'无效。] System.Data.LikeNode.AnalyzePattern（String   pat）+1251846 System.Data.LikeNode.Eval（DataRow row，DataRowVersion   版本）+345 System.Data.BinaryNode.EvalBinaryOp（Int32 op，   ExpressionNode为left，ExpressionNode为right，DataRow为row，DataRowVersion   版本，Int32 [] recordNos）+13013
  System.Data.BinaryNode.Eval（DataRow row，DataRowVersion version）+29
  System.Data.BinaryNode.EvalBinaryOp（Int32 op，ExpressionNode left，   ExpressionNode对，DataRow行，DataRowVersion版本，Int32 []   recordNos）+13013 System.Data.BinaryNode.Eval（DataRow row，   DataRowVersion版）+29
  System.Data.BinaryNode.EvalBinaryOp（Int32 op，ExpressionNode left，   ExpressionNode对，DataRow行，DataRowVersion版本，Int32 []   recordNos）+13013 System.Data.BinaryNode.Eval（DataRow row，   DataRowVersion版）+29
  System.Data.BinaryNode.EvalBinaryOp（Int32 op，ExpressionNode left，   ExpressionNode对，DataRow行，DataRowVersion版本，Int32 []   recordNos）+13013 System.Data.BinaryNode.Eval（DataRow row，   DataRowVersion版）+29
  System.Data.BinaryNode.EvalBinaryOp（Int32 op，ExpressionNode left，   ExpressionNode对，DataRow行，DataRowVersion版本，Int32 []   recordNos）+13013 System.Data.BinaryNode.Eval（DataRow row，   DataRowVersion版）+29
  System.Data.DataExpression.Invoke（DataRow行，DataRowVersion版本）   +151 System.Data.Index.AcceptRecord（Int32 record，IFilter filter）+103 System.Data.Index.InitRecords（IFilter filter）+303 System.Data.Index..ctor（DataTable table，Int32 [] ndexDesc，   IndexField [] indexFields，Comparison`1比较，DataViewRowState   recordStates，IFilter rowFilter）+491
  System.Data.DataTable.GetIndex（IndexField [] indexDesc，   DataViewRowState recordStates，IFilter rowFilter）+228
  System.Data.DataView.UpdateIndex（布尔力，布尔值fireEvent）   +165 System.Data.DataView.UpdateIndex（布尔强制）+12 System.Data.DataView.SetIndex2（String newSort，DataViewRowState   newRowStates，IFilter newRowFilter，Boolean fireEvent）+113
  System.Data.DataView.SetIndex（String newSort，DataViewRowState   newRowStates，IFilter newRowFilter）+17
  System.Data.DataView.set_RowFilter（String value）+160
  System.Web.UI.WebControls.FilteredDataSetHelper.CreateFilteredDataView（数据表   table，String sortExpression，String filterExpression，IDictionary   filterParameters）+396
  System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect（DataSourceSelectArguments   论点）+2012
  System.Web.UI.DataSourceView.Select（DataSourceSelectArguments   参数，DataSourceViewSelectCallback回调）+21
  System.Web.UI.WebControls.DataBoundControl.PerformSelect（）+ 143 3   System.Web.UI.WebControls.BaseDataBoundControl.DataBind（）+74
  System.Web.UI.WebControls.GridView.DataBind（）+ 4
  System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound（）+66
  System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls（）   +75 System.Web.UI.Control.EnsureChildControls（）+ 102 System.Web.UI.Control.PreRenderRecursiveInternal（）+42
  System.Web.UI.Control.PreRenderRecursiveInternal（）+ 1755   System.Web.UI.Control.PreRenderRecursiveInternal（）+ 1755   System.Web.UI.Control.PreRenderRecursiveInternal（）+ 1755   System.Web.UI.Control.PreRenderRecursiveInternal（）+ 1755   System.Web.UI.Control.PreRenderRecursiveInternal（）+ 1755   System.Web.UI.Page.ProcessRequestMain（布尔   includeStagesBeforeAsyncPoint，Boolean includeStagesAfterAsyncPoint）   2496

此致 Christopher Witalis Peterson

Answer 1

您是否尝试过将参数化搜索文本设置为'％'+ @ SearchText +'％'？

Answer 2

 SelectCommand="SELECT [PlayerID], [Nickname], [UserName], [ClubNumber], [FirstName], [Email], [LastName], [DOB] FROM [Players] where Nickname like '%'+@Nickname+'%' order by lastname ASC">
                <SelectParameters>
                     <asp:ControlParameter ControlID="txtWinnersSearch" Name="Nickname" PropertyName="Text" Type="String"/>
                </SelectParameters>
            </asp:SqlDataSource>

如何将此过滤器表达式更改为参数化查询？

2 个答案: