在图表中显示错误 [英] in the chart shows the error

问题描述

sql =选择不同的r.rate作为Rate，f.bfid作为BFid FROM bthfac AS f，批处理b，facfeedback r;

sql = sql +where month（b.examdate ）=''+ Ddlmonth.Text +''和year（b.examdate）=''+ DropDownList2.Text +''和;

sql = sql +r。 bfid = f.bfid和b.bthid = f.bthid和f.facid =''+ DropDownList4.SelectedValue +'';

dr = scon.ReadSql（sql）;

GridView3.DataSource = dr;

GridView3.DataBind（）;

GridView3.Visible = true;





//在图表中显示该代码的gridview记录如下



dr = scon.ReadSql（sql）;

int [] LRate = new int [GridView3.Rows.Count];

int [] LBFid = new int [GridView3.Rows.Count];

int i = 0;

while（dr.Read（））

{

LRate [i] = int.Parse（dr [0] .ToString（））;

LBFid [i] = int.Parse（dr [1] .ToString（）） ;

Chart1.Series.Add（LBFid [i] .ToString（））;

i = i + 1;

}





在运行模式下执行时显示错误如下;





：''SeriesCollection''中已经存在名为''65'的图表元素。



有什么问题我上面的代码。



请你好p me。





注意它是使用asp.net使用c＃的web应用程序。



问候

Narasiman P.

sql = "select distinct r.rate as Rate,f.bfid as BFid FROM bthfac AS f,batch b,facfeedback r";
sql = sql + " where month(b.examdate)= ''" + Ddlmonth.Text + "'' and year(b.examdate)= ''" + DropDownList2.Text + "'' and ";
sql = sql + " r.bfid=f.bfid and b.bthid=f.bthid and f.facid = ''" + DropDownList4.SelectedValue + "''";
dr = scon.ReadSql(sql);
GridView3.DataSource = dr;
GridView3.DataBind();
GridView3.Visible = true;


//Displaying the gridview records in the chart for that code as follows

dr = scon.ReadSql(sql);
int[] LRate = new int[GridView3.Rows.Count];
int[] LBFid = new int[GridView3.Rows.Count];
int i = 0;
while (dr.Read())
{
LRate[i] = int.Parse(dr[0].ToString());
LBFid[i] = int.Parse(dr[1].ToString());
Chart1.Series.Add(LBFid[i].ToString());
i = i + 1;
}


in the run mode when i execute shows error as follows;


:A chart element with the name ''65'' already exists in the ''SeriesCollection''.

what is the problem in my above code.

please help me.


Note it is web application using asp.net using c#.

Regards
Narasiman P.

推荐答案

我认为这是这部分：

I think it''s this part:

Chart1.Series.Add(LBFid[i].ToString());

尝试添加一个具有相同名称的元素。

在将其添加到Collection之前，您应该检查是否已有一个具有该Name的元素。

Is trying to add an element with the same name.
You should check if there is already an element with that Name before you add it to the Collection.

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