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Design Patterns: Problems and Solutions with Model-View-ViewModel

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

The Model-View-ViewModel (MVVM) design pattern describes a popular approach for building Windows Presentation Foundation or Microsoft Silverlight applications. Robert McCarter shows you how the ViewModel works, and discuss some benefits and issues involved in implementing a ViewModel in your code.

Robert McCarter

MSDN Magazine July 2010

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Model View ViewModel question



I´m playing around with XAML and MVVM, and have a question about the wiring between the model and the viewmodel:

If I have a model that updates its data on random times, what wiring is used between the model and the viewmodel to let the viewmodel know that the model has changed?.

Between the view and viewmodel a bindings and NotifyPropertyChanged would take care of this.


Trying to learn

MVVM Bind View Details to Model Via ViewModel when a Button clicked.


I have model called Car with prperties name,model,type,year.

I have implemeted the Viewmodel with same properties with OnpropertyChangedEvent including model object type Property.

I have a view usercontrol where textboxes for name, model and for year a combobox.

Whenever i fill the view i want to save those details into model via view model

I have written ICommand  Save which calls SaveCarDetails defined in viewmodel,  which is bind to a button in view ,All other texboxes text is bind to the properties of viewmodel properties.

When i put break point at ICommand SaveCommand and SaveCarDetails Function i could see the values filled from view.

But when i bind these details to another user control where listbox is placed and its itemsource property is set to Car property nothing but model object defined in the viewmodel.

I couldn't see the values binding via viewmodel to model.

Where as if i bind to textboxes in the listview i could see the values because i it's a dependency property.

Can any one please tell me what is the wrong i am doing here.




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Custom Control Design view error



I have created a custom control from scratch and it works fine as in you can build the project that uses it and it works fine at runtime. Problem is when you go to design view the control shows an error in the place of where the control should be rendered.

Error: '<SomeValue>' Could not be set to '<SomeProperty>'

This shows up on all my custom set properties. These properties are created as basic as possible. I can give the properties values in Source view and run the app just fine. I can even add a Onclick event. If I don't set any custom properties the control will render fine in Design view. It's only when I set a value to a custom property.

Property Code Example:

public string Text
                string ret = "";
                object obj = ViewState["Text"];
                if (obj != null)
                    ret = obj.ToString();
                return ret;
                ViewState["Text"] = value;

I've even removed the Category and Description tags with no difference.

I don't know if what I said makes sens, but I hope it

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