我有一个工作网格视图，它使用名为dsCustomers的数据集。我正在进行更改以便能够搜索gridview（在按键搜索时）。我通过使用DataTable使搜索过程工作，该DataTable通过使用sqlDataReader进行填充（建立连接然后运行SQL SELECT）。但是sqlDataReader没有为我提供所有所需数据的字段，因为有些数据是从外部源（数据库外部）填充的。所以我需要用dsCustomers数据集填充DataTable。
以下是完整的代码：
<%@ Page Language="C#" MasterPageFile="~/Master.master" AutoEventWireup="true" Inherits="Customers" Title="Customers" Codebehind="Customers.aspx.cs" EnableEventValidation="false"%>
<%@ Register assembly="System.Web.Entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" namespace="System.Web.UI.WebControls" tagprefix="asp" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient"%>
<asp:Content ID="cntMain" ContentPlaceHolderID="plcMainBody" runat="Server">
<script runat="server">
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ToString());
SqlCommand cmd = new SqlCommand();
DataView dv = new DataView();
DataTable dt = new DataTable();
DataTable dtsort = new DataTable();
private DataTable DataTable
{
get { return (DataTable)Session["DataTable"]; }
set { Session["DataTable"] = value; }
}
private DataView DataView
{
get { return (DataView)Session["DataView"]; }
set { Session["DataView"] = value; }
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
if (!this.IsPostBack)
{
DataTable dt;
if (this.DataTable == null)
LoadDataToTable();
else dt = this.DataTable;
this.txtNumber.Attributes.Add("onkeyup", string.Format("javascript:__doPostBack('{0}','')", this.upnlGridView.ClientID));
}
else
{
string target = this.Request.Form["__EVENTTARGET"];
if (!string.IsNullOrEmpty(target) && target.Equals(this.upnlGridView.ClientID))
{
if (!string.IsNullOrEmpty(this.txtNumber.Text))
{
Filter();
}
else
{
this.grvItems.DataSource = this.DataTable;
this.grvItems.DataBind();
}
}
}
}
private void Filter()
{
if (!string.IsNullOrEmpty(this.txtNumber.Text))
{
DataRow[] rows = this.DataTable.Select(string.Format("ID LIKE '%{0}%'", this.txtNumber.Text));
this.grvItems.DataSource = this.LoadData(rows);
this.grvItems.DataBind();
}
}
private void LoadDataToTable()
{
// con.Open();
// cmd.Connection = con;
// cmd.CommandText = "select * from Users"; --I NEED TO USE THE DATASET // RETURN HERE (dsCustomers)
// cmd.CommandType = System.Data.CommandType.Text;
//
// SqlDataAdapter adapter = new SqlDataAdapter(cmd);
// DataSet dsCustomers = new DataSet();
// adapter.Fill(dsCustomers);
this.grvItems.DataSource = dsCustomers;
// this.grvItems.DataBind();
Session["DataTable"] = dt;
}
protected void PageIndexChanging(object sender, GridViewPageEventArgs e)
{
}
protected void Sorting(object sender, GridViewSortEventArgs e)
{
BindData(e.SortExpression);
}
private void BindData(string sortExpression)
{
// reset the dataview, else it will be undefined value!
dv = (DataView)Session["DataView"];
if (sortExpression.Length > 0)
{
dv.Sort = sortExpression;
// save the dataview in stateless environment
Session["DataView"] = dv;
}
this.grvItems.DataSource = dv;
this.grvItems.DataBind();
}
private DataTable LoadData()
{
return this.LoadData(null);
}
private DataTable LoadData(DataRow[] rows)
{
DataTable dt = this.GetTable();
if (rows != null)
{
foreach (DataRow r in rows)
{
dt.Rows.Add(r[0], r[1]);
}
}
dv = dt.DefaultView;
Session["DataView"] = dv;
return dt;
}
private DataTable GetTable()
{
DataTable dt = new DataTable();
dt.Columns.Add("ID", String.Empty.GetType());
dt.Columns.Add("Role", String.Empty.GetType());
return dt;
}
</script>
</head>
<body>
<asp:ScriptManager runat="server" ID="PageScriptManager" />
Search EID:
<asp:TextBox runat="server" ID="txtNumber" AutoPostBack="true" />
<asp:UpdatePanel runat="server" ID="upnlGridView">
<ContentTemplate>
<hr />
<asp:GridView runat="server" ID="grvItems" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" PageSize="20" OnRowEditing="grvItems_RowEditing"
ShowFooter="True" OnRowCommand="grvItems_RowCommand"
OnRowCreated="grvItems_RowCreated" OnRowDeleted="grvItems_RowDeleted"
CellPadding="5" DataSourceID="dsCustomers">
<AlternatingRowStyle CssClass="DataGridAlternate" />
<RowStyle CssClass="DataGridItemStyle" />
<HeaderStyle CssClass="Header"></HeaderStyle>
<FooterStyle CssClass="DataGridAlternate"></FooterStyle>
<Columns>
<asp:TemplateField>
<HeaderStyle HorizontalAlign="Center" Width="40px" VerticalAlign="Middle" />
<ItemStyle HorizontalAlign="Center" />
<ItemTemplate>
<asp:ImageButton runat="server" ImageUrl="images/icon-pencil.gif" AlternateText="Edit"
CommandName="Edit" CausesValidation="False" ID="btnEdit"></asp:ImageButton>
<asp:ImageButton runat="server" ImageUrl="images/icon-delete.gif" AlternateText="Delete"
CommandName="Delete" CausesValidation="False" ID="btnDelete" OnClientClick="return confirm('Are you sure you want to delete?');">
</asp:ImageButton>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" />
<asp:BoundField DataField="Role" HeaderText="Role" SortExpression="Role" />
<asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName" />
<asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
<asp:BoundField DataField="PhoneNumber" HeaderText="Phone Number" SortExpression="PhoneNumber" />
<asp:BoundField DataField="LOCATION" HeaderText="Location" SortExpression="dsCustomers" />
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
<table width="100%">
<tr>
<td width="10%"> </td>
<td align="left">
<asp:Label ID="lblMessage" runat="server" Text="" CssClass="error"></asp:Label>
</td>
</tr>
</td>
</tr>
</table>
<asp:ObjectDataSource ID="dsCustomers" runat="server" SelectMethod="GetDataDictionary"
TypeName="DataObjects.dsCustomers " InsertMethod="AddUpdate"
UpdateMethod="AddUpdate" DeleteMethod="Delete">
<SelectParameters>
<asp:Parameter Name="ID" Type="String" ConvertEmptyStringToNull="False" DefaultValue="ALL" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="ID" Type="String" />
<asp:Parameter Name="Role" Type="String" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="ID" Type="String" />
<asp:Parameter Name="Role" Type="String" />
</InsertParameters>
<DeleteParameters>
<asp:Parameter Name="EID" Type="String" />
</DeleteParameters>
</asp:ObjectDataSource>
</asp:Content>
有人可以就如何做到这一点提供一些指导或指导吗？ 感谢
答案 0 :(得分：1)
使用SqlDataAdapter：
private void LoadDataToTable()
{
con.Open();
cmd.Connection = con;
cmd.CommandText = "select * from Users";
cmd.CommandType = System.Data.CommandType.Text;
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet dataset = new DataSet();
adapter.Fill(dataset);
this.grvItems.DataSource = dataset;
this.grvItems.DataBind();
Session["DataTable"] = dt;
}
正如Tim Schmelter指出的那样，您不希望连接打开太长时间，但显示的当前代码不允许我重构。我只关注当前的问题：）
答案 1 :(得分：1)
您可以使用SqlDataAdapter同时填充DataTable和DataSet：
DataSet ds = new DataSet();
using(var con = new SqlConnection("Connection-String"))
using (var da = new SqlDataAdapter("select * from Users", con))
{
// you don't need to use con.Open which is done by Fill automatically
da.Fill(ds);
}
请注意，您应该尽快关闭连接（在ASP.NET中更多），这就是我使用using的原因。启用连接池（默认）关闭后，它会将其标记为＆＃34;未使用＆＃34;。