图表从数据表中添加了3个系列的多个系列

Question

  SqlDataAdapter da = new SqlDataAdapter("select p.mn as dta,p.quan as 
    quan,i.quan,iss.quan from purchase p join inward i on p.mn=i.nm join issue iss on p.mn = iss.nm where p.pid = 4 and i.pid = 4 and iss.pid = 4", con);
    DataTable dt = new DataTable();
    da.Fill(dt);
    chart1.DataSource = dt;           
    chart1.Series["Purchase"].XValueMember = "mn";
  chart1.Series["Purchase"].YValueMembers ="quan";

我试了但是没有生成图表

Answer 1

设置DataSource后，您还需要绑定：

chart1.DataBind();

您还需要为所有其他XValueMember设置YValueMember和Series。

只要添加或更改了数据点，就应该致电DataBind()！