uielementcollection | 易学教程

Silveright UIElementCollection change notifications?

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问题 I am deriving a class from the Silverlight Panel class so that I can perform some custom positioning of the child elements of the panel. How do you find out when the collection of child items has been changed? The Panel.Children collection does not have any events indicating change notifications. Do I have to scan the Children collection each time a measure occurs and look for the elements that have been added and disappeared? 回答1: Try this post: Silverlight: Getting notified upon changes to

How delete data from CollectionTable | Hibernate (Jpa) [duplicate]

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问题 This question already has an answer here : How to delete data from org.hibernate.collection.PersistentBag? | Hibernate (Jpa) (1 answer) Closed 5 years ago . i have "A" entity with List<String> MyList : @Entity(name = "A_table") @Inheritance(strategy=InheritanceType.JOINED) public class A implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; private String RepresentativeName; @ElementCollection

Given UIElementCollection, find all elements that have StyleA, and change them to StyleB in WPF

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问题 I've got a MyGrid.Children UIElementCollection, I would like to find all the Rectangles in it that have there styles set to StyleA, and set them to StyleB. I'd like to use LINQ if possible, so I can avoid a nasty nested loop. Something like this pseudocode: var Recs = from r in MyGrid.Children where r.Style == StyleA && r.GetType() == typeof(Rectangle) select r as Rectangle; then: foreach(Rectangle r in Recs) r.Style = StyleB; Can a LINQ guru help me improve my LINQ-fu? 回答1: Your code was

Given UIElementCollection, find all elements that have StyleA, and change them to StyleB in WPF

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I've got a MyGrid.Children UIElementCollection, I would like to find all the Rectangles in it that have there styles set to StyleA, and set them to StyleB. I'd like to use LINQ if possible, so I can avoid a nasty nested loop. Something like this pseudocode: var Recs = from r in MyGrid.Children where r.Style == StyleA && r.GetType() == typeof(Rectangle) select r as Rectangle; then: foreach(Rectangle r in Recs) r.Style = StyleB; Can a LINQ guru help me improve my LINQ-fu? Your code was almost correct, but UIElements don't have a Style property... You can filter the grid's children based to their

How to select a child from an UIElementCollection where a property = some value?

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I have a UniformGrid with a number of Button 's as Children . Each Button has a Tag with an ID, e.g. (dumbed down code): MyUniformGrid.Children.Add(new Button { Margin = new Thickness(5), Tag = Query.GetUInt32("id"), Width = 200 }); How can I select the child Button object with an ID of 87? (as a for instance) Intellisense isn't popping up with the Linq methods when I type MyUniformGrid.Children. (after adding using System.Linq; ). Here you go: var MyButton = MyUniformGrid.Children. OfType<Button>(). Single(Child => Child.Tag != null && Child.Tag == 87); Linq can't be run directly on

How to select a child from an UIElementCollection where a property = some value?

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问题 I have a UniformGrid with a number of Button 's as Children . Each Button has a Tag with an ID, e.g. (dumbed down code): MyUniformGrid.Children.Add(new Button { Margin = new Thickness(5), Tag = Query.GetUInt32("id"), Width = 200 }); How can I select the child Button object with an ID of 87? (as a for instance) Intellisense isn't popping up with the Linq methods when I type MyUniformGrid.Children. (after adding using System.Linq; ). 回答1: Here you go: var MyButton = MyUniformGrid.Children.