您好我的代码有问题，我正在实施评级应用程序。我已将访问数据库连接到我的网站。然后我添加了ajax控件和gridview等。 到目前为止这是我的代码..
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</cc1:ToolkitScriptManager>
<asp:GridView ID="gvwMake" runat="server" DataKeyNames="MachineID"
BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px"
CellPadding="3" AllowPaging="True"
OnSelectedIndexChanged="gvwMake_SelectedIndexChanged">
<FooterStyle BackColor="White" ForeColor="#000066" />
<HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
<RowStyle ForeColor="#000066" />
<SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F1F1F1" />
<SortedAscendingHeaderStyle BackColor="#007DBB" />
<SortedDescendingCellStyle BackColor="#CAC9C9" />
<SortedDescendingHeaderStyle BackColor="#00547E" />
<Columns>
<asp:BoundField DataField="Make" HeaderText="Make" />
<asp:ImageField DataImageUrlField="Image"></asp:ImageField>
<asp:TemplateField HeaderText="Machine Rating">
<ItemTemplate>
<cc1:Rating ID="Rating1"
AutoPostBack="true" OnChanged="OnRatingChanged" runat="server"
StarCssClass="Star" WaitingStarCssClass="WaitingStar"
EmptyStarCssClass="Star"
FilledStarCssClass="FilledStar"
CurrentRating='<%# Eval("Rating") %>'>
</cc1:Rating>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
这一切似乎都运行良好，但问题在于背后的代码。
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
using System.Data.SqlClient;
using AjaxControlToolkit;
public partial class rate : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataSet ds = MachineClass.getMachine();
gvwMake.DataSource = ds.Tables["dtMachine"];
gvwMake.DataBind();
}
}
protected void gvwMake_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gvwMake.PageIndex = e.NewPageIndex;
DataSet ds = MachineClass.getMachine();
gvwMake.DataSource = ds.Tables["dtMachine"];
gvwMake.DataBind();
}
protected void gvwMake_SelectedIndexChanged(object sender, EventArgs e)
{
string strID = gvwMake.SelectedRow.Cells[2].Text;
Session["TID"] = strID;
Response.Redirect("~/Result.aspx");
}
protected void btnSearch_Click(object sender, EventArgs e)
{
DataSet ds = MachineClass.getMachine(txtSearch.Text);
gvwMake.DataSource = ds.Tables["dtMachine"];
gvwMake.DataBind();
}
private void ShowData()
{
using (OleDbDataAdapter da = new OleDbDataAdapter(
"SELECT TOP 20 Products.ProductID, Products.ProductName," +
" Products.UnitPrice, Products.SupplierID, " +
"Products.CustomerRating FROM Products",
new OleDbConnection(
ConfigurationManager.ConnectionStrings["comac.mdb.accdb"].ToString())))
{
DataTable dt = new DataTable();
da.SelectCommand.Connection.Open();
da.Fill(dt);
this.gvwMake.DataSource = dt;
this.gvwMake.DataBind();
}
}
protected void Rating1_Changed(object sender,
AjaxControlToolkit.RatingEventArgs e)
{
AjaxControlToolkit.Rating myRating =
(AjaxControlToolkit.Rating)sender;
System.Text.RegularExpressions.Regex rexLineNo =
new System.Text.RegularExpressions.Regex("ctl\\d+");
this.updateRating(this.MachineId(
rexLineNo.Match(myRating.UniqueID).ToString()), e.Value);
}
private string MachineId(string LineNo)
{
foreach (GridViewRow r in this.gvwMake.Rows)
{
Label lblMachineId = (Label)r.FindControl("lblMachineId");
if (lblMachineId.UniqueID.Contains(LineNo))
{
return lblMachineId.Text;
}
}
return string.Empty;
}
private void updateRating(string MachineId, string Rating)
{
OleDbParameter paramRating = new OleDbParameter("@Rating", Rating);
OleDbParameter paramMachineId =
new OleDbParameter("@MachineId", MachineId);
using (OleDbCommand cmd = new OleDbCommand(
"UPDATE Machines SET CustomerRating " +
"= @Rating WHERE Machines.MachineID=@MachineId",
new OleDbConnection(
ConfigurationManager.ConnectionStrings["comac.mdb.accdb"].ToString())))
{
cmd.Parameters.Add(paramRating);
cmd.Parameters.Add(paramMachineId);
cmd.Connection.Open();
cmd.ExecuteNonQuery();
}
}
}
这是我第一次使用ajax评级控件，并且在运行网页时不确定代码是否适合我收到错误消息 'ASP.rate_aspx'不包含'OnRatingChanged'的定义，并且没有扩展方法'OnRatingChanged'可以找到接受类型'ASP.rate_aspx'的第一个参数（你是否缺少using指令或程序集引用？）
答案 0 :(得分：1)
好的，这是C＃代码。您必须导入以下命名空间：
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using AjaxControlToolkit;
//the page_onload add the following code
if (!IsPostBack)
{
gvFruits.DataSource = GetData("SELECT FruitId, FruitName, ISNULL((SELECT AVG(Rating) FROM Fruit_Ratings WHERE FruitId = Fruits.FruitId), 0) Rating FROM Fruits");
gvFruits.DataBind();
}
private static DataTable GetData(string query)
{
DataTable dt = new DataTable();
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand(query))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
sda.SelectCommand = cmd;
sda.Fill(dt);
}
}
return dt;
}
}
//and here is the code full functioning app for rating.[Full functioning rating app code][1]
[1]: http://www.aspsnippets.com/Articles/Using-ASPNet-AJAX-Rating-Control-inside-GridView-TemplateField-ItemTemplate.aspx
答案 1 :(得分：1)
我可以从代码的以下部分看到：
<ItemTemplate>
<cc1:Rating ID="Rating1"
AutoPostBack="true" OnChanged="OnRatingChanged" runat="server"
StarCssClass="Star" WaitingStarCssClass="WaitingStar"
EmptyStarCssClass="Star"
FilledStarCssClass="FilledStar"
CurrentRating='<%# Eval("Rating") %>'>
</cc1:Rating>
</ItemTemplate>
是您使用评级控制的地方，您将OnChanged事件分配给方法背后的代码OnRatingChanged （在代码中称为OnChanged="OnRatingChanged"）并且代码后面没有任何名为OnRatingChanged的方法会抛出错误，说'ASP.rate_aspx'不包含'OnRatingChanged'的定义。
因此，如果你真的没有使用这个事件，那么删除事件（从你的代码中删除部分：OnChanged="OnRatingChanged"）或者如果你使用它，那么在你的代码中包含一个适当的'OnRatingChanged'方法
答案 2 :(得分：1)
首先从你的ajax工具箱添加ajax工具包，然后用css应用followin编码。
<style type="text/css">
.Star
{
background-image: url(Images/rsz_star-deselect.png);
height: 17px;
width: 17px;
}
.WaitingStar
{
/*background-image: url(images/WaitingStar.gif);*/
height: 17px;
width: 17px;
}
.FilledStar
{
background-image: url(Images/rsz_star-select.png);
height: 17px;
width: 17px;
}
</style>
<ItemTemplate>
<cc1:Rating ID="Rating1" AutoPostBack="true" runat="server"
StarCssClass="Star" WaitingStarCssClass="WaitingStar" EmptyStarCssClass="Star"
FilledStarCssClass="FilledStar" CurrentRating='<%# Eval("Rating") %>'>
</cc1:Rating>
</ItemTemplate>
答案 3 :(得分：0)