MultiBinding

Path (default): string

List of properties to access in order to obtain a target value, separated by dots. Can also contain the names to be used in lookups. Is used to get a value from each item of a source collection.

Expression: string

Markup extension expression to be created for each item of a source collection. Must start with $ character, which signifies a string literal.

Source: IObservableCollection

Source of the binding. Must be a collection of items.

Filter: IFilter

Filter that can pass or discard items of a collection.

{MultiBinding Source={Binding ItemId=Tube}, Filter={CompositeFilter F1=Conditional, P1=${Binding IsClickable}, F2=Skip, P2=3, F3=Take, P3=2}}

Filter in example above selects all clickable tubes, skips first three and takes first two out of remaining.

Allowed values:

• Skip: IFilter

  Skips n item(s) from available items.

  Example

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  {MultiBinding Source={Binding ItemId=Tube}, Filter={CompositeFilter F1=Skip, P1=2}}

  In the example above, the filter selects all tubes and skips the first two.

• Take: IFilter

  Takes n item(s) from available items.

  Example

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  {MultiBinding Source={Binding ItemId=Tube}, Filter={CompositeFilter F1=Take, P1=3}}

  In the example above, the filter selects all tubes and takes the first three.

• Conditional: IFilter

  Selects item(s) from available items based on given condition(s).

  Example

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  {MultiBinding Source={Binding ItemId=Tube}, Filter={CompositeFilter F1=Conditional, P1=${Binding IsClickable}}}

  In the example above, the filter selects all clickable tubes.

• OrderBy: IFilter

  Sorts available items in ascending order.

  Example

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  {MultiBinding Source={Binding ItemId=Tube}, Filter={CompositeFilter F1=OrderBy}}

  In the example above, the filter sorts all tubes in ascending order.

• OrderByDescending: IFilter

  Sorts available items in descending order.

  Example

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  {MultiBinding Source={Binding ItemId=Tube}, Filter={CompositeFilter F1=OrderByDescending}}

  In the example above, the filter sorts all tubes in descending order.

• DescendantElements: IFilter

FilterParameter : object

Parameter to be used by the filter.

Aggregate : Aggregate

A function to be used for aggregation of collection items.

Allowed values:

• None - default value, no aggregation happens and collection of items is returned
• Sum - sum of all items. Items must be numbers
• Product - product of all items. Items must be numbers
• Max - a largest item in a collection. Items must be numbers
• Min - a smallest item in a collection. Items must be numbers
• Average - average value of collection items. Items must be numbers
• AllTrue - all values in collection are True. Items must be boolean
• AllFalse - all values in collection are False. Items must be boolean
• AnyTrue - at least one item in collection has value True. Items must be boolean
• AnyFalse - at least one item in collection has value False. Items must be boolean
• Count - amount of items in a collection
• Any - True if collection has at least one item and False otherwise
• Single - a single item of a collection. Null if collection has no items. Error is thrown if collection has more than one item
• First - a first item of a collection. Null if collection has no items
• Last - a last item of a collection. Null if collection has no items

                      <
                      Field Id="Field_TubesCount" Value="{MultiBinding Source={Binding ItemId=Tube}, Aggregate=Count}" />
<Field Id="Field_AllTubesClickable" Value="{MultiBinding IsClickable, Source={Binding ItemId=Tube},  Aggregate=AllTrue}" />
<Field Id="Field_AllTubesClickable" Value="{MultiBinding Source={Binding ItemId=Tube}, Filter=Conditional, FilterParameter=${Binding IsClickable, Converter=Invert}, Aggregate=Any}" />
<Field Id="Field_AllTubesClickedAtLeastTwice" Value="{MultiBinding Source={Binding ItemId=Tube}, Expression=${Binding ClickCount, Converter=GreaterThanOrEquals, ConverterParameter=2}, Aggregate=AllTrue}" />
<Field Id="Field_AtLeastOneTubeClickedAtLeastThreeTimes" Value="{MultiBinding Source={Binding ItemId=Tube}, Expression=${Binding ClickCount, Converter=GreaterThan, ConverterParameter=2}, Aggregate=AnyTrue}" />