多线图

Question

我一直在试图制作一个多线图，它从数据库中提取数据。 在努力做到这一点，我写了下面的代码来填充图表：

SqlConnection con1 = new SqlConnection(); 
    con1.ConnectionString = ConfigurationManager.ConnectionStrings["Removed"].ToString(); 
    SqlCommand cmd1 = new SqlCommand("SELECT YEAR(Start_Date) AS Year, Month(Start_Date) As Month, Cost, Utility_Type FROM import_Utilities WHERE YEAR(Start_Date) = 2011 AND Utility_Type = 'Water'"); 
    cmd1.Connection = con1; 
    con1.Open(); 

    SqlDataAdapter da1 = new SqlDataAdapter(cmd1); 
    DataTable dt1 = new DataTable(); 
    da1.Fill(dt1); 
    Chart1.DataSource = dt1; 

    Chart1.Series["Series2"].XValueMember = "Month"; 
    Chart1.Series["Series2"].YValueMembers = "Cost"; 
    Chart1.Legends.Add(new Legend("Default") { Docking = Docking.Right }); 


    Chart1.DataBind(); 
    con1.Close(); 

    SqlConnection con = new SqlConnection(); 
    con.ConnectionString = ConfigurationManager.ConnectionStrings["Removed"].ToString(); 
    con.Open(); 
    SqlCommand cmd = new SqlCommand("SELECT YEAR(Start_Date) AS Year, Month(Start_Date) As Month, Cost, Utility_Type FROM import_Utilities WHERE YEAR(Start_Date) = 2012 AND Utility_Type = 'Water'"); 
    cmd.Connection = con; 
    SqlDataAdapter da = new SqlDataAdapter(cmd); 
    DataTable dt = new DataTable(); 
    da.Fill(dt); 
    Chart1.DataSource = dt; 
    Chart1.Series["2010"].XValueMember = "Month"; 
    Chart1.Series["2010"].YValueMembers = "Cost"; 

    Chart1.DataBind(); 
    con.Close(); 

此代码的工作，除了它有两个数据源，所以只有底部的SqlConnection被填充到图表。 我在失去如何解决这个问题，我想他们是一个更好的方式去做这件事，但我很茫然。

UPDATE：

使用例如波纹管我结束了使用枢轴SQL使一个表（参照图片）。 然后我更新了我的代码如下所示：

SqlCommand cmd = new SqlCommand("SELECT * FROM (SELECT YEAR(Start_Date), CASE MONTH(Start_Date) WHEN 1 THEN 'January' WHEN 2 THEN 'February' WHEN 3 THEN 'March' WHEN 4 THEN 'April' WHEN 5 THEN 'May' WHEN 6 THEN 'June' WHEN 7 THEN 'July' WHEN 8 THEN 'August' WHEN 9 THEN 'September'WHEN 10 THEN 'October' WHEN 11 THEN 'November' WHEN 12 THEN 'December' END as [Month], [Cost] FROM [HousingAccountingReports].[dbo].[import_Utilities] Where [Building] = 'Building B' AND [Utility_Type] = 'Electric') TableDate PIVOT (SUM([Cost]) FOR [Month] IN ([January],[February],[March],[April],[May],[June],[July],[August],[September],[October],[November],[December])) PivotTable"); 
    cmd.Connection = con; 
    SqlDataAdapter da = new SqlDataAdapter(cmd); 
    DataTable dt = new DataTable(); 
    da.Fill(dt); 
    Chart3.DataSource = dt; 
    Chart3.Series["Series1"].XValueMember = "Month"; 
    Chart3.Series["Series1"].YValueMembers = "2010"; 
    Chart3.Series["Series2"].XValueMember = "Month"; 
    Chart3.Series["Series2"].YValueMembers = "2011"; 
    Chart3.Series["Series3"].XValueMember = "Month"; 
    Chart3.Series["Series3"].YValueMembers = "2012"; 
    Chart3.DataBind();` 

当我运行该页面就错误找不到列一个月。如果我添加：
dt.Columns.Add（“Month”）; dt.Columns.Add（“Year”）;` 它找不到2010，我如何让我的图表正确驾驶;是他们的问题与我的枢轴sql？

Answer 1

昨天我回答了类似的问题。 Separating Chart Series

你不能改变一个图表的数据源，而不正在重置的数据，你在上面的代码做的事情。

就像昨天的问题，我会建议你创建一个数据表先在数据表中，然后引用列到你的特殊系列

从昨天的回答

所以，作为一个建议，清理代码，我会做以下

1. 获取2个数据表
2. 中号二哥与“月”的数据表作为主键
3. 每列添加到图表作为新系列

或者你也可以手动绘制系列

因此下降

Chart1.DataSource = dt 
Chart1.Series["2010"].XValueMember = "Month"; 
Chart1.Series["2010"].YValueMembers = "Cost"; 

并将其替换为

For Each row As DataRow In dt1.Rows 
    Chart1.Series("Series2").Points.AddXY(row.Item("Month"), row.Item("Cost")) 
Next 

For Each row As DataRow In dt.Rows 
    Chart1.Series("2010").Points.AddXY(row.Item("Month"), row.Item("Cost")) 
Next 

如果您管理您的所有数据放在一个Datatable，并与创建的，那么你可以根据你的代码做以下

Dim dt As New DataTable 
    dt.Columns.Add("Month", GetType(String)) 
    dt.Columns.Add("2010", GetType(Integer)) 
    dt.Columns.Add("2011", GetType(Integer)) 

    dt.Rows.Add("January", 15, 25) 
    dt.Rows.Add("February", 18, 32) 
    dt.Rows.Add("March", 12, 34) 
    dt.Rows.Add("April", 12, 34) 

    Chart1.DataSource = dt 
    Chart1.Series(0).XValueMember = "Month" 
    Chart1.Series(0).YValueMembers = "2010" 

    Chart1.Series(1).XValueMember = "Month" 
    Chart1.Series(1).YValueMembers = "2011" 

    Chart1.DataBind() 

两个系列的图表这应该工作我的理解：

SqlConnection con = new SqlConnection(); 
     con.ConnectionString = ConfigurationManager.ConnectionStrings["removed"].ToString(); 
     con.Open(); 
     SqlCommand cmd = new SqlCommand("SELECT YEAR(Start_Date) AS Year, Month(Start_Date) As Month, Cost, Utility_Type, Building FROM import_Utilities WHERE YEAR(Start_Date) = 2012 AND YEAR(Start_Date) = 2011 AND Utility_Type = 'Water'"); 

     cmd.Connection = con; 
     SqlDataAdapter da = new SqlDataAdapter(cmd); 
     DataTable dt = new DataTable(); 
     da.Fill(dt); 

    Chart1.DataSource = dt; 
    Chart1.Series(0).XValueMember = "Month"; 
    Chart1.Series(0).YValueMembers = "2010"; 

    Chart1.Series(1).XValueMember = "Month"; 
    Chart1.Series(1).YValueMembers = "2011" 

    Chart1.DataBind() 

数据表dt应该有所有的数据在它{因为我graving的两年）（我怎样才能将其绑定到一个表，所以我可以确认）

眼下它的抱怨系列不能被用作不过的方法。

我是一个非常新的程序员，只有在我的空闲时间这样做，所以原谅我简单的错误。

我是否需要像设置数据表一样设置数据表： Chart1.DataSource = dt; Chart1.Series（0）.XValueMember =“Month”; Chart1.Series（0）.XValueMember =“Month”; Chart1.Series（0）.YValueMembers =“2010”;

Chart1.Series(1).XValueMember = "Month"; 
    Chart1.Series(1).YValueMembers = "2011" 

    Chart1.DataBind() 

还是这样做的基础上的SQL表？