应该是简单问题,谢谢
show.aspx片段如下:
<tr align="middle" valign="center">
<td width="40%">
<asp:Label id="a_answer" runat="server"></asp:Label>
</td>
<td width="40%">
<asp:Image id="Image1" runat="server" Height="6px"></asp:Image>
</td>
<td width="10%">
<asp:Label id="a_vote" runat="server"></asp:Label>票
</td>
<td width="10%">%</td>
</tr>
show.aspx.cs片段如下:
SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["connectionString"]);
SqlCommand cmdGetAnswer = new SqlCommand("SELECT * FROM Answer where q_id = 1",myConnection);
myConnection.Open();
dtrGetAnswer=cmdGetAnswer.ExecuteReader();
while (dtrGetAnswer.Read())
{
i=i+1;
if (all_vote==0)
a_percent=0;
else
a_percent=System.Convert.ToInt32(dtrGetAnswer["a_vote"])/all_vote*100;
a_answer.Text=dtrGetAnswer["a_answer"].ToString();
Image1.ImageUrl="images/bar/bar" + i +".gif";
Image1.Attributes.Add("width",a_percent.ToString() + "%");
a_vote.Text=dtrGetAnswer["a_vote"].ToString();
}
q_id = 1的记录有4条,如何将其读出来全部显示,因为涉及图片问题,所以没有用DataGrid,请问要怎么办?谢谢拉
问题点数:70、回复次数:5Top
1 楼htys3(海天一舍)回复于 2003-12-03 14:26:32 得分 0
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2 楼veaven(风林火山)回复于 2003-12-03 18:07:10 得分 10
建议使用DataList
编辑其模板列
然后在ItemCreate事件中写代码,显示数据Top
3 楼camelials(星期五)回复于 2003-12-03 18:43:32 得分 60
用下面的好玩一点:
//用asp.net画饼图(可用于各种投票程序)
//和asp相比asp.net拥有更强大的功能,使用gdi+可以轻易实现以前很多不能办到的图形功能。
//首先在c:\中建库mess.mdb,并建表title.
//建二个字段,title(char型),point(int型)
//非常满意 281
//比较满意 297
//还凑合 166
//不满意 416
//我还写了画折线图和条形图的部分,目前正在把它们全部写进一个类中。需要的可以和我联系:mailto:ouyang76@263.net
<%@ Page Language="C#" %>
<%@import namespace="System.Data"%>
<%@import namespace="System.Data.OleDb"%>
<%@import namespace="System.Drawing"%>
<%@import namespace="System.Drawing.Imaging"%>
<script language="c#" runat="server">
public void page_load(Object obj,EventArgs e)
{
//把连接字串指定为一个常量
const String strconn = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=c:\\mess.mdb";
OleDbConnection conn=new OleDbConnection(strconn);
conn.Open();
string sql="select * from title";
OleDbCommand cmd=new OleDbCommand(sql,conn);
DataSet ds=new DataSet();
OleDbDataAdapter adapter1=new OleDbDataAdapter(cmd);
adapter1.Fill(ds);
conn.Close();
float total=0.0f,tmp;
int iloop;
for(iloop=0;iloop<ds.Tables[0].Rows.Count;iloop++)
{
tmp=Convert.ToSingle(ds.Tables[0].Rows[iloop]["point"]);//转换成单精度,投票不可能投半票。也可写成Convert.ToInt32
total+=tmp;
}
//Response.Write(Convert.ToString(total));
Font fontlegend=new Font("verdana",9),fonttitle=new Font("verdana",10,FontStyle.Bold);//设置字体
//fonttitle为主标题的字体
int width=230;//白色背景宽
const int bufferspace=15;
int legendheight=fontlegend.Height*(ds.Tables[0].Rows.Count+1)+bufferspace;
int titleheight = fonttitle.Height + bufferspace;
int height = width + legendheight + titleheight + bufferspace;//白色背景高
int pieheight = width;
Rectangle pierect=new Rectangle(0,titleheight,width,pieheight);
//加上各种随机色
ArrayList colors = new ArrayList();
Random rnd = new Random();
for (iloop = 0; iloop < ds.Tables[0].Rows.Count; iloop++)
colors.Add(new SolidBrush(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))));
Bitmap objbitmap=new Bitmap(width,height);//创建一个bitmap实例
//Bitmap objbitmap=new Bitmap(230,500);//创建一个bitmap实例
Graphics objgraphics=Graphics.FromImage(objbitmap);
objgraphics.FillRectangle(new SolidBrush(Color.White), 0, 0, width, height);//画一个白色背景
objgraphics.FillRectangle(new SolidBrush(Color.LightYellow), pierect);//画一个亮黄色背景
//以下为画饼图(有几行row画几个)
float currentdegree=0.0f;
for (iloop = 0; iloop < ds.Tables[0].Rows.Count; iloop++)
{
objgraphics.FillPie((SolidBrush) colors[iloop], pierect, currentdegree,
Convert.ToSingle(ds.Tables[0].Rows[iloop]["point"]) / total * 360);
currentdegree += Convert.ToSingle(ds.Tables[0].Rows[iloop]["point"]) / total * 360;
}
//---以下为生成主标题
SolidBrush blackbrush=new SolidBrush(Color.Black);
string title="本次《程序员大本营》推出了配套的专刊,您对专刊满意吗?";
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;
objgraphics.DrawString(title, fonttitle, blackbrush,
new Rectangle(0, 0, width, titleheight), stringFormat);
//列出各字段与得票数
objgraphics.DrawRectangle(new Pen(Color.Black, 2), 0, height - legendheight, width, legendheight);
for (iloop = 0; iloop < ds.Tables[0].Rows.Count; iloop++)
{
objgraphics.FillRectangle((SolidBrush) colors[iloop], 5, height - legendheight + fontlegend.Height * iloop + 5, 10, 10);
objgraphics.DrawString(((String) ds.Tables[0].Rows[iloop]["title"]) + " - " + Convert.ToString(ds.Tables[0].Rows[iloop]["point"]), fontlegend, blackbrush,
20, height - legendheight + fontlegend.Height * iloop + 1);
}
//
objgraphics.DrawString("总票数是:"+Convert.ToString(total),fontlegend,blackbrush, 5, height - fontlegend.Height );
//图像总的高度-一行字体的高度,即是最底行的一行字体高度(height - fontlegend.Height )
Response.ContentType="image/jpeg";
objbitmap.Save(Response.OutputStream,ImageFormat.Jpeg);
//objbitmap.Save("myyyyyyyyyyy.jpg", ImageFormat.Jpeg);//输出到文件
objgraphics.Dispose();
objbitmap.Dispose();
}
</script>
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4 楼camelials(星期五)回复于 2003-12-03 18:47:46 得分 0
如果还是想用把一张图片的width*100,然后后按比率显示投票的结果,可以参考下面:
SPVote是一个Span。
MyDataBase view=new MyDataBase();
view.SqlString="select * from tb_vt where l_fb=1";
int QestionCount=view.GetDataSet.Tables[0].Rows.Count;
for(int j=0;j<QestionCount;j++)
{
SPVote.InnerHtml+="<tr><TD colspan=\"3\" align=\"middle\">";
SPVote.InnerHtml+="<font face=\"幼圆\" size=\"5\" color=\"#FF9933\"><b>网上调查结果查看</b></font>";
SPVote.InnerHtml+="</td></tr>";
//
SPVote.InnerHtml+="<tr><TD colspan=\"3\" align=\"middle\">";
SPVote.InnerHtml+=view.GetDataSet.Tables[0].Rows[j]["ch_title"].ToString();
SPVote.InnerHtml+="</td></tr>";
int count=0;
MyDataBase MyAns=new MyDataBase();
MyAns.SqlString="select * from vote where v_id="+view.GetDataSet.Tables[0].Rows[j]["v_id"].ToString();
for(int i=0;i<MyAns.GetDataSet.Tables[0].Rows.Count;i++)
{
count=count+Convert.ToInt32(MyAns.GetDataSet.Tables[0].Rows[i]["c_num"].ToString());
}
for(int i=0;i<MyAns.GetDataSet.Tables[0].Rows.Count;i++)
{
SPVote.InnerHtml+="<tr><td>";
SPVote.InnerHtml+=MyAns.GetDataSet.Tables[0].Rows[i][1].ToString();
SPVote.InnerHtml+="</td><td>";
SPVote.InnerHtml+="得";
SPVote.InnerHtml+=MyAns.GetDataSet.Tables[0].Rows[i][2].ToString();
SPVote.InnerHtml+="票";
SPVote.InnerHtml+="</td><td>";
int percentage=100*Convert.ToInt32(MyAns.GetDataSet.Tables[0].Rows[i]["c_num"].ToString())/count;
SPVote.InnerHtml+="投票率:"+"<img src=\"images\\back.gif\" height=10 width="+200*Convert.ToInt32(MyAns.GetDataSet.Tables[0].Rows[i]["c_num"].ToString())/count+">"+" "+percentage.ToString()+"%";
SPVote.InnerHtml+="</td></tr>";
}
SPVote.InnerHtml+="</table>";
SPVote.InnerHtml+="<p></p>";
SPVote.InnerHtml+="总共";
SPVote.InnerHtml+=count.ToString();
SPVote.InnerHtml+="人参加投票,谢谢您的参与!";
SPVote.InnerHtml+="<p></p>";Top
5 楼camelials(星期五)回复于 2003-12-03 18:53:14 得分 0
上面用到了两个表:
一个问题表:tb_vt
一个回答项表:vote(通过记录tb_vt的id两表关联)
上面代码可同时显示出所有已经发布的问题的投票结果(tb_vt中字段:l_fb=1的所以问题)。所以用了两个for循环来嵌套的。
看看关键的代码,应该解决你的问题。
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