使用 SqlDataSource 进行搜索
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【中文标题】使用 SqlDataSource 进行搜索【英文标题】：Using SqlDataSource for searching 【发布时间】：2015-11-08 00:39:48 【问题描述】：我正在尝试使用 sqldatasource 使用文本框在 GridView 中进行搜索，并启用了 edit、update 和 paging；但是，当我单击 update 成功搜索后，过滤后的 GridView 并没有显示，而是显示了每个数据的整个 GridView。谢谢，请指教。
aspx.cs 页面：
namespace Inventory
public partial class Results : System.Web.UI.Page
//SqlConnection conn = new SqlConnection("Data Source=10.10.101.188;Initial Catalog=ActioNetITInventory;User ID=rails.sa;Password=ActioNet1234");
private String ConnString = ConfigurationManager.ConnectionStrings["ActioNetITInventoryConnectionString"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
if (!IsPostBack)
//BindData();
//BindData2();
//BindData3();
//end if
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
BindData();
GridView1.PageIndex = e.NewPageIndex;
GridView1.DataBind();
//end page load
protected void BindData()
using (SqlConnection sqlCon = new SqlConnection(ConnString))
using (SqlCommand cmd = new SqlCommand())
cmd.CommandText = "SELECT * FROM [Inventory]";
cmd.Connection = sqlCon;
sqlCon.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
GridView1.DataSourceID = null;
GridView1.DataSource = dt;
GridView1.DataBind();
sqlCon.Close();
//end using
//end using
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
GridView1.EditIndex = e.NewEditIndex;
BindData();
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
var serial = GridView1.DataKeys[e.RowIndex].Value;
GridViewRow row = GridView1.Rows[e.RowIndex] as GridViewRow;
//getting row field details
TextBox Assigned = row.FindControl("txtAssigned") as TextBox;
TextBox Location = row.FindControl("txtLocation") as TextBox;
TextBox Notes = row.FindControl("txtNotes") as TextBox;
using (SqlConnection sqlCon = new SqlConnection(ConnString))
string sql = "UPDATE Inventory SET Assigned=@Assigned, " + "Location=@Location, Notes=@Notes" + " WHERE Serial = @Serial";
using (SqlCommand cmd = new SqlCommand(sql, sqlCon))
cmd.Parameters.AddWithValue("@Assigned", Assigned.Text.Trim());
cmd.Parameters.AddWithValue("@Location", Location.Text.Trim());
cmd.Parameters.AddWithValue("@Notes", Notes.Text);
cmd.Parameters.AddWithValue("@Serial", serial);
sqlCon.Open();
cmd.ExecuteNonQuery();
sqlCon.Close();
//end using
//end using
status.Visible = true;
status.Text = "" + Assigned.Text + "has been added successfully!";
status.ForeColor = System.Drawing.Color.Green;
GridView1.EditIndex = -1;
BindData();
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
GridView1.EditIndex = -1;
BindData();
html页面：
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False" DataKeyNames="Serial" DataSourceID="SqlDataSource1" CellPadding="4" ForeColor="#333333" GridLines="None" Width="1575px"
OnPageIndexChanging="GridView1_PageIndexChanging" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:CommandField ShowCancelButton="true" ShowEditButton="true" />
<asp:TemplateField HeaderText="Type" SortExpression="Type">
<ItemTemplate>
<asp:Label ID="lblType" runat="server" Text='<%#Eval("Type") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="btnInsert" runat="server" Text="Insert" CommandName="Add" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Make" SortExpression="Make">
<ItemTemplate>
<asp:Label ID="lblMake" runat="server" Text='<%#Eval("Make") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Model" SortExpression="Model">
<ItemTemplate>
<asp:Label ID="lblModel" runat="server" Text='<%#Eval("Model") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Serial" SortExpression="Serial">
<ItemTemplate>
<asp:Label ID="lblSerial" runat="server" Text='<%#Eval("Serial") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Assigned" SortExpression="Assigned">
<ItemTemplate>
<asp:Label ID="lblAssigned" runat="server" Text='<%#Eval("Assigned") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtAssigned" runat="server" Text='<%#Bind("Assigned") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAssigned" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Location" SortExpression="Location">
<ItemTemplate>
<asp:Label ID="lblLocation" runat="server" Text='<%#Eval("Location") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtLocation" runat="server" Text='<%#Bind("Location") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtLocation" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Notes" SortExpression="Notes">
<ItemTemplate>
<asp:Label ID="lblNotes" runat="server" Text='<%#Eval("Notes") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtNotes" runat="server" TextMode="MultiLine" Text='<%#Bind("Notes") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtNotes" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ActioNetITInventoryConnectionString %>" DeleteCommand="DELETE FROM [Inventory] WHERE [Serial] = @Serial" InsertCommand="INSERT INTO [Inventory] ([Type], [Make], [Model], [Serial], [Assigned], [Location], [Notes]) VALUES (@Type, @Make, @Model, @Serial, @Assigned, @Location, @Notes)" SelectCommand="SELECT * FROM [Inventory] WHERE ([Type] = @Type)" UpdateCommand="UPDATE [Inventory] SET [Type] = @Type, [Make] = @Make, [Model] = @Model, [Assigned] = @Assigned, [Location] = @Location, [Notes] = @Notes WHERE [Serial] = @Serial">
<DeleteParameters>
<asp:Parameter Name="Serial" Type="String" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="Type" Type="String" />
<asp:Parameter Name="Make" Type="String" />
<asp:Parameter Name="Model" Type="String" />
<asp:Parameter Name="Serial" Type="String" />
<asp:Parameter Name="Assigned" Type="String" />
<asp:Parameter Name="Location" Type="String" />
<asp:Parameter Name="Notes" Type="String" />
</InsertParameters>
<SelectParameters>
<asp:FormParameter FormField="typeTextBox" Name="Type" Type="String" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="Type" Type="String" />
<asp:Parameter Name="Make" Type="String" />
<asp:Parameter Name="Model" Type="String" />
<asp:Parameter Name="Assigned" Type="String" />
<asp:Parameter Name="Location" Type="String" />
<asp:Parameter Name="Notes" Type="String" />
<asp:Parameter Name="Serial" Type="String" />
</UpdateParameters>
</asp:SqlDataSource>
【问题讨论】：
【参考方案1】：您正在将 GridView 控件的数据源与此行上的 SqlDataSource 控件分离：
GridView1.DataSourceID = null;
由于在BindData() 方法中您正在执行一个没有WHERE 子句的查询，它会返回所有要绑定到网格的行，如下几行所示：
protected void BindData()
using (SqlConnection sqlCon = new SqlConnection(ConnString))
using (SqlCommand cmd = new SqlCommand())
cmd.CommandText = "SELECT * FROM [Inventory]";
cmd.Connection = sqlCon;
sqlCon.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
GridView1.DataSourceID = null;
GridView1.DataSource = dt;
GridView1.DataBind();
sqlCon.Close();
//end using
//end using
这实际上破坏了您的搜索条件，因为没有条件（WHERE 子句）应用于 SQL 查询。
您需要让SqlDataSource 控件的SelectCommand 支持具有“搜索”值和不具有“搜索”值。这样做的一种方法是这样的：
SelectCommand="SELECT * FROM [Inventory] WHERE ([Type] = @Type OR [Type] = '')"
将OR 逻辑添加到您的WHERE 子句将不会过滤掉任何行（假设您的Type 值都不是空白并且当您省略搜索时（即搜索文本框中的空白字符串）。
就我个人而言，我会创建一个返回 DataTable 对象并传入搜索条件的方法，该方法根据“搜索”字符串是否为空来构造两个单独的 SQL 语句，如下所示：
private DataTable GetData(string searchTerm)
DataTable dt = null;
// Check to see if search term is null or empty
if(!string.IsNullOrEmpty(searchTerm)
// Build SQL statement with WHERE clause
using (SqlConnection sqlCon = new SqlConnection(ConnString))
using (SqlCommand cmd = new SqlCommand())
cmd.CommandText = "SELECT * FROM [Inventory]
WHERE [Type] = @searchTermParameter";
cmd.Parameters.Add(new SqlParameter("@searchTermParameter", searchTerm));
cmd.Connection = sqlCon;
sqlCon.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
dt = new DataTable();
da.Fill(dt);
//end using
//end using
else
// Build SQL statement without WHERE clause,
// because we are not searching for anything
using (SqlConnection sqlCon = new SqlConnection(ConnString))
using (SqlCommand cmd = new SqlCommand())
cmd.CommandText = "SELECT * FROM [Inventory]";
cmd.Connection = sqlCon;
sqlCon.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
dt = new DataTable();
da.Fill(dt);
//end using
//end using
return dt;
现在您可以让您的DataBind 方法只接受一个DataTable 对象，它的唯一职责是将数据绑定到GridView 控件，如下所示：
protected void BindData(DataTable dt)
GridView1.DataSource = dt;
GridView1.DataBind();
【讨论】：
谢谢！现在我试图在回发期间绑定数据，但是我在 BindData() 参数中放了什么？下面的代码：protected void Page_Load(object sender, EventArgs e) if(!IsPostBack) BindData();
@Terrence Sanchez - 只需调用 GetData (string.Empty);，这将获取所有行，因为 GetData 方法中的条件逻辑。
我这样做了，但是，当我单击第二个进入第二页时，什么都没有显示。这是代码：protected void GridView1_PageIndexChanging(object sender, GridViewPageEvenArgs e) GridView1.PageIndex = e.NewPageIndex; GetData(string.Empty); //end paging
@Terrence Sanchez - 您需要在页面索引更改事件处理程序中调用 BindData (string.Empty);。
@Terrence Sanchez - 抱歉的意思是BindData (GetData (string.Empty ));以上是关于使用 SqlDataSource 进行搜索的主要内容，如果未能解决你的问题，请参考以下文章
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