TreeMapItem.Value Property

Gets or sets the tree map item value.

Namespace: DevExpress.XtraTreeMap

Assembly: DevExpress.XtraTreeMap.v19.1.dll

Declaration

C#

[XtraSerializableProperty]
[DefaultValue(0)]
public double Value { get; set; }

VB.NET

<XtraSerializableProperty>
<DefaultValue(0)>
Public Property Value As Double

Property Value

Type	Default	Description
Double	0	A Double value.

Example

To manually provide data for a TreeMap, assign a newly created instance of the TreeMapItemStorage class to the TreeMapControl.DataAdapter property. Then, create several objects of the TreeMapItem class or its descendant class, specify their TreeMapItem.Label and TreeMapItem.Value properties, and add them to the TreeMapItemStorage.Items collection.

Note – to create a group, you will need to add a new TreeMapItem and fill its TreeMapItem.Children collection with tree map items.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-manually-populate-treemap-with-data-t360867

Form1.cs

void ConfigureTreeMapDataAdapter() {
    TreeMapItemStorage storage = new TreeMapItemStorage();
    treeMap.DataAdapter = storage;

    TreeMapItem americasGroup = new TreeMapItem { Label = "Americas" };
    americasGroup.Children.Add(new TreeMapItem { Label = "United States", Value = 17.968 });
    americasGroup.Children.Add(new TreeMapItem { Label = "Brazil", Value = 1.8 });
    americasGroup.Children.Add(new TreeMapItem { Label = "Canada", Value = 1.573 });
    storage.Items.Add(americasGroup);

    TreeMapItem europeGroup = new TreeMapItem { Label = "Europe" };
    europeGroup.Children.Add(new TreeMapItem { Label = "Germany", Value = 3.371 });
    europeGroup.Children.Add(new TreeMapItem { Label = "United Kingdom", Value = 2.865 });
    europeGroup.Children.Add(new TreeMapItem { Label = "France", Value = 2.423 });
    europeGroup.Children.Add(new TreeMapItem { Label = "Italy", Value = 1.819 });
    storage.Items.Add(europeGroup);

    TreeMapItem asiaGroup = new TreeMapItem { Label = "Asia" };
    asiaGroup.Children.Add(new TreeMapItem { Label = "China", Value = 11.385 });
    asiaGroup.Children.Add(new TreeMapItem { Label = "Japan", Value = 4.116 });
    asiaGroup.Children.Add(new TreeMapItem { Label = "India", Value = 2.183 });
    storage.Items.Add(asiaGroup);
}

Form1.vb

Private Sub ConfigureTreeMapDataAdapter()
    Dim storage As New TreeMapItemStorage()
    treeMap.DataAdapter = storage

    Dim americasGroup As TreeMapItem = New TreeMapItem With {.Label = "Americas"}
    americasGroup.Children.Add(New TreeMapItem With {.Label = "United States", .Value = 17.968})
    americasGroup.Children.Add(New TreeMapItem With {.Label = "Brazil", .Value = 1.8})
    americasGroup.Children.Add(New TreeMapItem With {.Label = "Canada", .Value = 1.573})
    storage.Items.Add(americasGroup)

    Dim europeGroup As TreeMapItem = New TreeMapItem With {.Label = "Europe"}
    europeGroup.Children.Add(New TreeMapItem With {.Label = "Germany", .Value = 3.371})
    europeGroup.Children.Add(New TreeMapItem With {.Label = "United Kingdom", .Value = 2.865})
    europeGroup.Children.Add(New TreeMapItem With {.Label = "France", .Value = 2.423})
    europeGroup.Children.Add(New TreeMapItem With {.Label = "Italy", .Value = 1.819})
    storage.Items.Add(europeGroup)

    Dim asiaGroup As TreeMapItem = New TreeMapItem With {.Label = "Asia"}
    asiaGroup.Children.Add(New TreeMapItem With {.Label = "China", .Value = 11.385})
    asiaGroup.Children.Add(New TreeMapItem With {.Label = "Japan", .Value = 4.116})
    asiaGroup.Children.Add(New TreeMapItem With {.Label = "India", .Value = 2.183})
    storage.Items.Add(asiaGroup)
End Sub

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Value property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-customize-treemap-tooltips-t361925/CS/ToolTipCustomization/Form1.cs#L36

superTip.Items.Add(new ToolTipSeparatorItem());
superTip.Items.Add(new ToolTipItem { Text = String.Format("<b>GDP (2014):</b> {0:C1} trillions", item.Value) });
e.SuperTip = superTip;

VB.NET

how-to-customize-treemap-tooltips-t361925/VB/ToolTipCustomization/Form1.vb#L42

superTip.Items.Add(New ToolTipSeparatorItem())
superTip.Items.Add(New ToolTipItem With {.Text = String.Format("<b>GDP (2014):</b> {0:C1} trillions", item.Value)})
e.SuperTip = superTip