如何定義數據源的佈局？

我有需要顯示圖表2級系列的對象C＃程序。目前我只有一個包含2個數據表的數據集。這兩個表具有相同的佈局。我結合數據集到該圖表的數據源屬性，並執行數據綁定（）方法。它只顯示一個系列。如何定義數據源的佈局？

我認爲解決的辦法是定義一個自定義的BindingContext，但我似乎無法弄清楚。有人能幫幫我嗎？謝謝。

下面是我的一些代碼：

 DataSet dataSet = new DataSet(); 

     DataTable dataTable = database.Query("select sum(amount) as monthamount, month(transdate) as month from transaction where year(transdate)=" + balanceDateTimePicker.Value.Year + " group by month"); 
     dataSet.Tables.Add(dataTable); 

     dataTable = database.Query("select sum(amount) as monthamount, month(transdate) as month from transaction where year(transdate)=" + balanceDateTimePicker.Value.AddYears(-1).Year + " group by month"); 
     dataSet.Tables.Add(dataTable); 

     reoccuranceChart.DataSource = dataSet; 
     System.Windows.Forms.DataVisualization.Charting.Series series = reoccuranceChart.Series["Series1"]; 
     series.XValueMember = "month"; 
     series.YValueMembers = "monthamount"; 
     series.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column; 
     series.IsVisibleInLegend = false; 

     series = reoccuranceChart.Series["Series2"]; 
     series.XValueMember = "month"; 
     series.YValueMembers = "monthamount"; 
     series.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column; 
     series.IsVisibleInLegend = false; 

     reoccuranceChart.DataBind();

來源

2012-03-12 NoAlternative

我覺得你的問題是在你的dataTable變量的重用。您需要創建一個數據表二爲第二個查詢，以防止重新分配第一，因爲添加的功能並不在表中複製數據，它只是持有對它的引用。嘗試改變：

dataTable = database.Query ...

到

DataTable dataTable2 = database.Query...

然後將其添加爲第二個表，看看能否解決。

來源

2012-03-12 19:51:12

謝謝，但這不是問題。在圖表中我總是得到第一個查詢的結果。在查詢函數中創建一個新的DataTable。它不會覆蓋舊的。 – NoAlternative 2012-03-12 22:13:55

我發現了它。這其實很簡單。我所要做的就是，單獨綁定series.points：

 DataSet dataSet = new DataSet(); 

     DataTable dataTable = database.Query("select sum(amount) as monthamount, month(transdate) as month from transaction where year(transdate)=" + balanceDateTimePicker.Value.Year + " group by month"); 
     dataSet.Tables.Add(dataTable); 

     dataTable = database.Query("select sum(amount) as monthamount, month(transdate) as month from transaction where year(transdate)=" + balanceDateTimePicker.Value.AddYears(-1).Year + " group by month"); 
     dataSet.Tables.Add(dataTable); 

     System.Windows.Forms.DataVisualization.Charting.Series series = reoccuranceChart.Series["Now"]; 
     series.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column; 
     //series.IsVisibleInLegend = false; 
     series.Points.DataBind(dataSet.Tables[0].DefaultView, "month", "monthamount", ""); 

     series = reoccuranceChart.Series["Last year"]; 
     series.ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column; 
     //series.IsVisibleInLegend = false; 
     series.Points.DataBind(dataSet.Tables[1].DefaultView, "month", "monthamount", "");

來源

2012-03-13 18:32:01 NoAlternative

偉大的解決方案。謝謝！新玩家的另一個提示是：如果你的代碼的頂部仍然有一行，如chart.DataSource = myDataSet;等等...然後刪除它！因爲它會根據此解決方案在單個數據綁定的頂部重新打開。一旦我刪除這一行，上面的解決方案工作。活泉！ – Aaron 2012-12-07 08:01:49

如何定義數據源的佈局？

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