数据可视化新方式，SankeyDiagramControl类的使用你不能错过！（Part 1）

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命名空间：DevExpress.XtraCharts.Sankey

程序集：DevExpress.XtraCharts.v20.2.UI.dll

声明

C#

[SerializationContext(typeof(SankeySerializationContext))]
public class SankeyDiagramControl :
Control,
ISankeyContainer,
IToolTipControlClient,
ISupportLookAndFeel,
ISankeyRenderProvider,
IChartRenderProvider,
IPrintable,
IBasePrintable

VB.NET

<SerializationContext(GetType(SankeySerializationContext))>
Public Class SankeyDiagramControl
Inherits Control
Implements ISankeyContainer,
IToolTipControlClient,
ISupportLookAndFeel,
ISankeyRenderProvider,
IChartRenderProvider,
IPrintable,
IBasePrintable

注释

Sankey图表描述系统中实体（也称为节点）之间的转移或流，该图可以帮助您找到对流程最重要的贡献。

下图显示了图元素：

每个链接都连接源节点和目标节点，并具有分配的值-权重，链接的宽度与其重量成正比。

添加到项目

将SankeyDiagramControl组件从Toolbox拖放到窗体中，来将Sankey图添加到项目中。

这会将对以下程序集的引用添加到项目中：

• DevExpress.Charts.v20.2.Core.dll
• DevExpress.Data.Desktop.v20.2.dll
• DevExpress.Data.v20.2.dll
• DevExpress.Printing.v20.2.Core.dll
• DevExpress.XtraPrinting.v20.2.dll
• DevExpress.Utils.v20.2.dll
• DevExpress.Utils.v20.2.Core.dll
• DevExpress.XtraBars.v20.2.dll
• DevExpress.XtraCharts.v20.2.dll
• DevExpress.XtraCharts.v20.2.UI.dll
• DevExpress.XtraCharts.v20.2.Wizard.dll
• DevExpress.XtraEditors.v20.2.dll

绑定到数据

使用DataSource属性将控件绑定到数据源，您可以为该属性分配一个实现以下任何接口的对象：IList，IListSource或IBindingList。

然后指定存储用于源节点、目标节点和权重数据的数据成员名称：

• SourceDataMember - 指定包含源节点标签的数据成员的名称。
• TargetDataMember - 指定包含目标节点标签数据成员的名称。
• WeightDataMember (Optional) - 指定包含链接权重的数据成员名称，如果未指定WeightDataMember属性，则权重等于1。

C#

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using DevExpress.XtraCharts.Sankey;
namespace SankeySample {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e) {
sankeyDiagramControl1.DataSource = GetSankeyItems();
sankeyDiagramControl1.SourceDataMember = "Source";
sankeyDiagramControl1.TargetDataMember = "Target"; 
sankeyDiagramControl1.WeightDataMember = "Value";
sankeyDiagramControl1.Titles.Add(new SankeyTitle { Text = "Export/Import" });
}
List<SankeyItem> GetSankeyItems() {
List<SankeyItem> data = new List<SankeyItem> {
new SankeyItem { Source = "France", Target = "UK", Value = 53 },
new SankeyItem { Source = "Australia", Target = "UK", Value = 72 },
new SankeyItem { Source = "France", Target = "Canada", Value = 81 },
new SankeyItem { Source = "China", Target = "Canada", Value = 96 },
new SankeyItem { Source = "UK", Target = "France", Value = 61 },
new SankeyItem { Source = "Canada", Target = "France", Value = 89 },
};
return data;
}
}
public class SankeyItem {
public string Source { get; set; }
public string Target { get; set; }
public double Value { get; set; }
}
}

VB.NET

Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports DevExpress.XtraCharts.Sankey

Namespace SankeySample
Public Partial Class Form1
Inherits Form

Public Sub New()
InitializeComponent()
End Sub

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
sankeyDiagramControl1.DataSource = GetSankeyItems()
sankeyDiagramControl1.SourceDataMember = "Source"
sankeyDiagramControl1.TargetDataMember = "Target" 
sankeyDiagramControl1.WeightDataMember = "Value"
sankeyDiagramControl1.Titles.Add(New SankeyTitle With {
.Text = "Export/Import"
})
End Sub

Private Function GetSankeyItems() As List(Of SankeyItem)
Dim data As List(Of SankeyItem) = New List(Of SankeyItem) From {
New SankeyItem With {
.Source = "France", .Target = "UK", .Value = 53
},
New SankeyItem With {
.Source = "Australia", .Target = "UK", .Value = 72
},
New SankeyItem With {
.Source = "France", .Target = "Canada", .Value = 81
},
New SankeyItem With {
.Source = "China", .Target = "Canada", .Value = 96
},
New SankeyItem With {
.Source = "UK", .Target = "France", .Value = 61
},
New SankeyItem With {
.Source = "Canada", .Target = "France", .Value = 89
}
}
Return data
End Function
End Class

Public Class SankeyItem
Public Property Source As String
Public Property Target As String
Public Property Value As Double
End Class
End Namespace

结果：

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