Question

我正在尝试对linq问题进行排序。我将数据绑定到silverlight telerik silverlight图表但没有太多运气。我可以使图表使用硬编码值，但是当我尝试将其绑定到数据库时，没有返回任何数据。

返回预期数据。

  public class TranactionDetail
{
    public DateTime TransactionDate { get; set; }
    public int TransactionType { get; set; }
    public double TransactionAmount { get; set; }
    public int Month{ get; set; }
    public string MonthName { get; set; }
    public double TransactionCount { get; set; }


    public static ObservableCollection<TranactionDetail> GetTransactions(int transactionType)
    {
        ObservableCollection<TranactionDetail> data;


        if (transactionType == 1)
        {
            data = new ObservableCollection<TranactionDetail>()
                       {
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 11,Month = DateTime.Now.AddMonths(1).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 3,Month = DateTime.Now.AddMonths(2).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(3).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(4).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(5).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 12,Month = DateTime.Now.AddMonths(6).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(7).Month,TransactionType = 1} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(8).Month,TransactionType = 1} ,
                       };

        }
        else 
        {
            data = new ObservableCollection<TranactionDetail>()
            {
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(1).Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 2,Month = DateTime.Now.AddMonths(2).Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 5,Month = DateTime.Now.AddMonths(3).Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(4).Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(5).Month,TransactionType =2} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(6).Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 1,Month = DateTime.Now.AddMonths(7).Month,TransactionType = 2} ,
                        new TranactionDetail(){TransactionAmount = 7,Month = DateTime.Now.AddMonths(8).Month,TransactionType = 2} ,
            };
        }
        return data;
    }
}

像这样绑定图表

   List<ObservableCollection<TransactionDetail>> data = new List<ObservableCollection<ransactionDetail>>();
        data.Add(TransactionDetail.GetTransactions(1));
        data.Add(TransactionDetail.GetTransactions(3));         
        this.radChart.ItemsSource = data;

的Xaml

<telerik:RadChart x:Name="radChart">
        <telerik:RadChart.DefaultView>
            <telerik:ChartDefaultView>
                <telerik:ChartDefaultView.ChartTitle>
                    <telerik:ChartTitle Content="Transaction Data" />
                </telerik:ChartDefaultView.ChartTitle>

            </telerik:ChartDefaultView>
        </telerik:RadChart.DefaultView>
        <telerik:RadChart.SeriesMappings>
            <telerik:SeriesMapping LegendLabel="Processed" CollectionIndex="0">
                <telerik:SeriesMapping.SeriesDefinition>
                    <telerik:LineSeriesDefinition ShowItemLabels="True" />
                </telerik:SeriesMapping.SeriesDefinition>
                <telerik:SeriesMapping.ItemMappings>
                    <telerik:ItemMapping DataPointMember="YValue" FieldName="TransactionAmount" />
                    <telerik:ItemMapping DataPointMember="XValue" FieldName="Month" />
                </telerik:SeriesMapping.ItemMappings>
            </telerik:SeriesMapping>
            <telerik:SeriesMapping LegendLabel="Redeemed" CollectionIndex="1">
                <telerik:SeriesMapping.SeriesDefinition>
                    <telerik:LineSeriesDefinition ShowItemLabels="True" />
                </telerik:SeriesMapping.SeriesDefinition>
                <telerik:SeriesMapping.ItemMappings>
                    <telerik:ItemMapping DataPointMember="YValue" FieldName="TransactionAmount" />
                    <telerik:ItemMapping DataPointMember="XValue" FieldName="Month"  />
                </telerik:SeriesMapping.ItemMappings>
            </telerik:SeriesMapping>
        </telerik:RadChart.SeriesMappings>
    </telerik:RadChart>

现在，如果我尝试将数据绑定到实际数据，如

 var grouped = from t in TransctionData
                      group t by new
                      {
                          t.PurchaseDate.Value.Month
                      }
                          into g
                          select new TransactionDetail()
                          {
                              Month = g.Select((n => n.PurchaseDate.Value.Month)).First(),
                              TransactionAmount = g.Count()
                          };


        List<ObservableCollection<TransactionDetail>> data = new     List<ObservableCollection<TransactionDetail>>();
        this.radChart.ItemsSource = grouped.ToList();

没有返回任何内容。我已经放置了一个断点，我可以看到这是分组中的值，它们看起来像TransactionDetail。

我假设使用observablecollection的第一个方法与仅使用tolist（）的第二个方法是原因。

我需要改变什么？

Answer 1

标题的答案是这样的：http://clinq.codeplex.com/我从未使用它，但你可以试着看看它是不是你要找的东西。

Answer 2

嘿那里。而不是使用.ToList（）你可以使用List＆gt;

投射'分组'

this.radChart.ItemsSource = (List<ObservableCollection<TransactionDetail>>)grouped;

由于

Answer 3

你之前看过Telerik的这个链接吗？

http://www.telerik.com/help/silverlight/radchart-features-grouping-and-aggregation.html

和这一个

http://www.telerik.com/help/silverlight/radchart-populating-with-data-data-binding-support-overview.html

Answer 4

将SeriesMapping修改为基于telerik用户指南的要求

将linq查询转换为observablecollection

4 个答案: