Re: Binding Commands to Events? - WPF Discussion Boards

Mark Salsbery2-Jun-09 7:16

Mark Salsbery

2-Jun-09 7:16

If you don't want to copy the entire DataGrid template, the scrollbars
are named "PART_HorizontalScrollBar" and "PART_VerticalScrollBar"...you
could find those controls at runtime and set their style/template appropriately.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Mark Salsbery2-Jun-09 7:27

Mark Salsbery

2-Jun-09 7:27

You can also take a scrollbar template like the example at
ScrollBar ControlTemplate Example[^] and put it
right in the DataGrid's resources (or any place in the resources "above" the datagrid.
If the style doesn't have a key then the DataGrid will automagically use it on its
scrollbars.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Jammer2-Jun-09 8:11

Jammer

2-Jun-09 8:11

I was just going to say that, scroll bars are a great candidate for a typed style rather than x:key="" type. Nice and consistent.

Jammer
My Blog | Article(s)

Binding Commands to Events?

vsaratkar2-Jun-09 9:00

vsaratkar

2-Jun-09 9:00

Thanks Mark,
I achieved what I was looking for.

Steve The Plant2-Jun-09 3:29

Steve The Plant

2-Jun-09 3:29

Hi,

What's a good method to bind Commands to Events? In my WPF app, there are events that I'd like to capture and process by my ViewModel but I'm not sure how. Things like losing focus, mouseover, mousemove, etc. Since I'm trying to adhere to the MVVM pattern, I'm wondering if there's a XAML solution for that.

Thanks!

Pete O'Hanlon2-Jun-09 3:52

2-Jun-09 3:52

These events are, strictly speaking, view only events, so why would you want them to be handled in the VM? There's no rule that says you can't have code behind the view, so if you need to do things, you can do it there. What are you trying to do that goes beyond the V/VM separation?

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Steve The Plant2-Jun-09 4:12

Steve The Plant

2-Jun-09 4:12

Hi Pete,

Those events were just examples. It can be any type of event that I might need to handle.

In our application we can change XAML files dynamically, so we're trying to avoid solutions that involve code-behind files.

Thanks!

Steve The Plant3-Jun-09 2:53

Steve The Plant

3-Jun-09 2:53

I haven't tried it yet, but this answer looks promising.

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/0cb73e76-b7dd-4a47-af27-cd05da2f305e[^]

Pete O'Hanlon3-Jun-09 3:07

3-Jun-09 3:07

Attached behaviours are a good way to go - and one I'm particularly fond of (see this[^] blog post for an example).

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: Binding Commands to Events? [modified]

Niladri_Biswas3-Jun-09 17:24

Niladri_Biswas

3-Jun-09 17:24

I don't know your actual requirement but ICommand can be helpful in such situations.

It makes your view cleaner.

May I get the exact scenario for the problem?
Smile | :)

Niladri Biswas

modified on Thursday, June 4, 2009 10:32 AM

Pete O'Hanlon3-Jun-09 21:40

3-Jun-09 21:40

I suspect you meant to raise this against the OP, not me. He won't be notified of posts against my account, so could you reply to him instead.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

I marked My property with [DataMember] and I still have an exception

Niladri_Biswas6-Jun-09 16:00

Niladri_Biswas

6-Jun-09 16:00

I don't know your actual requirement but ICommand can be helpful in such situations.

It makes your view cleaner.

May I get the exact scenario for the problem?
Smile | :)

Niladri Biswas

Doria22862-Jun-09 2:56

Re: I marked My property with [DataMember] and I still have an exception

2-Jun-09 2:56

Look I marked the property Data:

[DataMember]
public List<object> Data
{
get;
set;
}
and I still have this exception dislayed:

"Method get_Data is not supported on this proxy, this can happen if the method is not marked with OperationContractAttribute or if the interface type is not marked with ServiceContractAttribute".

thank you ! Smile | :)

Pete O'Hanlon2-Jun-09 3:19

2-Jun-09 3:19

And is your contract interface marked with ServiceContract? Have you placed your DataMember on the implementation and not the interface?

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: I marked My property with [DataMember] and I still have an exception

Doria22862-Jun-09 4:24

Re: I marked My property with [DataMember] and I still have an exception

2-Jun-09 4:24

Here is approximately my code:

[ServiceContract]
public interface X
{
[DataMember]
List<y> Data {get;} //Y is a new type

}

[Data Contract]
public class Y
{
[DataMember]
public List<object> Data
{
get;
set;
}
}

Do I do any mistake?

Pete O'Hanlon2-Jun-09 4:37

2-Jun-09 4:37

The actual service contract is defined as an interface like this:

[ServiceContract]
public interface IMyInterface
{
  [OperationContract]
  List<int> DoSomething(MyData item);
}

This contract will be implemented by a concrete class, and DoSomething will be visible to systems that consume the service. The DataContract is defined as a concrete class like this:

[DataContract]
public class MyData
{
  [DataMember]
  public int DataValue1 { get; set; }
  [DataMember]
  public string Identifier { get; set; }
}

Then we define the class that implements the service contract like this:

public class ImplementInterface : IMyInterface
{
  public List<int> DoSomething(MyData item)
  {
    return item.DataValue1;
  }
}

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: I marked My property with [DataMember] and I still have an exception

Doria22862-Jun-09 5:02

Re: I marked My property with [DataMember] and I still have an exception

2-Jun-09 5:02

Excuse me I miss something:

[ServiceContract]
public interface X
{
[DataMember]
List<Y>  Data {get;} //Y is a new type

}

[Data Contract]
public class Y
{
[DataMember]
public List<object> Data
{
get;
set;
}
}

Having read your code I does not see why mine is incorrect

Mark Salsbery2-Jun-09 6:13

Mark Salsbery

2-Jun-09 6:13

Is class Y supposed to inherit interface X?

If so, you haven't shown that, and why do you have
List<Y> in interface X and List<object> in class Y?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: I marked My property with [DataMember] and I still have an exception

Doria22862-Jun-09 22:46

Re: I marked My property with [DataMember] and I still have an exception

2-Jun-09 22:46

The class Y doesn't inherit from the interface X, May be the confusion come because I gived the same identifier "data" for two different things!

I create the class Y just to define a new type (structured type) wich is not just composed from List<object> but other DataMembers such as string, int and a new other type Z, wich I create exactly in the same way as Y
and in my interface X, I have a DataMember (a property) wich type is List<y>.

Perhaps I not very Bright to express what I mean, therefore I detail the code of class Y and class Z down:

[DataContract]
public class Y
{
[DataMember]
public int id {get; set;}

[DataMember]
public string Str {get; set;}

[DataMember]
public Z NewType {get; set;}

[DataMember]
Public List<object> Data {get; set;}
}

[DataContract]
public class Z
{
[DataMember]
public int idz {get; set;}

[DataMember]
public string Strz {get; set;}

}

Thank you in advance Mark Salsbery ! Smile | :)

Pete O'Hanlon2-Jun-09 22:55

2-Jun-09 22:55

You've create a ServiceContract here, but you are using DataMembers. DataMembers belong to DataContracts - not ServiceContracts. In a ServiceContract, you use OperationContract to mark methods that will be consumed. Take another look at the code I gave you, and pay particular attention to which attribute is defined against which type.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: I marked My property with [DataMember] and I still have an exception

Doria22863-Jun-09 0:05

Re: I marked My property with [DataMember] and I still have an exception

3-Jun-09 0:05

But here it is not a method but a property in my ServiceContract, if I mark it with [operationContract] I have this error:

<big>Attribute 'OperationContract' is not valid on this declaration type. It is only valid on 'method' declarations.</big>

Is it impossible to declare a property in a ServiceContract ?

Pete O'Hanlon3-Jun-09 0:14

3-Jun-09 0:14

It's not impossible - you just have to do it slightly differently. What you do, is declare OperationContract on your get and set, so you get:

public int MyProperty
{
  [OperationContract]get;
  [OperationContract]set;
}

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: I marked My property with [DataMember] and I still have an exception

Doria22863-Jun-09 0:19

Re: I marked My property with [DataMember] and I still have an exception

3-Jun-09 0:19

thank you pete O'Hanlon Big Grin | :-D

, It is what I was looking for and thank you again

Pete O'Hanlon3-Jun-09 0:30

3-Jun-09 0:30

You're welcome.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.