[英]How to implement Search in Dynamic Data Site in .NET 4 with LINQ to SQL Classes
我刚刚创建了一个默认动态数据站点。 如何向其中添加搜索?
您可以通过执行以下操作来添加搜索功能。
首先使用以下代码将UI添加到List.aspx页面
<fieldset id="MultiSearchFieldSet" class="DD" runat="server" visible="False">
<asp:TextBox ID="txbMultiColumnSearch" CssClass="DDTextBox" runat="server" />
<asp:Button ID="btnMultiColumnSearchSubmit" CssClass="DDControl" runat="server" Text="Search"
OnClick="btnMultiColumnSearch_Click" />
<asp:Button ID="btnMultiColumnSearchClear" CssClass="DDControl" runat="server" Text="Clear"
OnClick="btnMultiColumnSearch_Click" />
</fieldset>
接下来,我们要为按钮添加代码隐藏,所以在 List.aspx.cs 上
protected void btnMultiColumnSearch_Click(object sender, EventArgs e)
{
}
并将其更改为
protected void btnMultiColumnSearch_Click(object sender, EventArgs e)
{
var button = (Button)sender;
if (button.ID == btnMultiColumnSearchClear.ID)
txbMultiColumnSearch.Text = String.Empty;
else
using (PhoneListDataContext Data = new PhoneListDataContext())
{
EmployeeNameString = txbMultiColumnSearch.Text;
var SearchResults = Data.Employees.Where
(Employee => (Employee.FirstName.Contains(EmployeeNameString) || (Employee.LastName.Contains(EmployeeNameString))));
GridView1.DataSourceID = "";
GridView1.DataSource = SearchResults;
GridView1.DataBind();
}
}
最后,因为我们只搜索“Employees”表,我想过滤搜索框的可见性,只对员工的表。
所以我将此代码添加到受保护的 void Page_Load 中的List.aspx.cs
if (table.DisplayName == "Employees") { MultiSearchFieldSet.Visible = true; }
else
{ MultiSearchFieldSet.Visible = false; };
现在页面是可搜索的!
更简单的解决方案
更改此行:
<h2 class="DDSubHeader"><%= table.DisplayName%></h2>
对此:
<h2 class="DDSubHeader"><%= table.DisplayName%></h2>
<!-- Custom:
- Added SearchTextBox and SearchButton.
- Attention: Requires SearchExpression to work,
see next Custom -comment later in this page.
-->
<table>
<tr>
<td>
<asp:TextBox ID="SearchTextBox" runat="server" />
</td>
<td>
<asp:Button ID="SearchButton" runat="server" Text="Search" />
</td>
<td>
<div class="DDBottomHyperLink">
<a href="<%= HttpContext.Current.Request.Url.AbsoluteUri %>">Clear search filter</a>
</div>
</td>
</tr>
</table>
<!-- Custom ends -->
更改 QueryExtender
由此:
<asp:QueryExtender TargetControlID="GridDataSource" ID="GridQueryExtender" runat="server">
<asp:DynamicFilterExpression ControlID="FilterRepeater" />
</asp:QueryExtender>
对此:
<!-- Custom: edit QueryExtender -->
<asp:QueryExtender TargetControlID="GridDataSource" ID="GridQueryExtender" runat="server">
<asp:DynamicFilterExpression ControlID="FilterRepeater" />
<asp:SearchExpression SearchType="Contains" DataFields="myfirstfield,mysecondfield,myNthfield" >
<asp:ControlParameter ControlID="SearchTextBox" />
</asp:SearchExpression>
</asp:QueryExtender>
<!-- Custom ends -->
注意改变myfirstfield,mysecondfield,myNthfield在您mything -table文本字段名。
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