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  • Validation errors prevent the property setter being called

    - by HA
    Hi, I am looking for a simple solution to the following problem: I am using a simple TextBox control with the Text property bound to a property in the code behind. Additionally I am using a validation rule to notify the user of malformed input. ... error display style here ... Now after entering valid data into the TextBox the user can hit a button to send the data. When clicking the button the data from the bound property UserName in the code behind is evaluated and sent. The problem is that a user can enter valid data into the TextBox and this will be set in the property UserName. If the user then decides to change the text in the TextBox and the data becomes invalid, the setter of the property UserName is not called after the failed validation. This means that the last valid data remains in the property UserName, while the TextBox display the invalid data with the error indicator. If the user then clicks on the button to send the data, the last valid data will be sent instead of the current TextBox content. I know I could deactivate the button if the data is invalid and in fact I do, but the method is called in the setter of UserName. And if that is not called after a failed validation the button stays enabled. So the question is: How do I enable calling of the property setter after a failed validation?

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  • How to determine whether or not a video format is supported

    - by Tal Even-Tov
    Hi, I've had to write an application that lists and plays tutorial videos along with accompanying text. It works well but since the videos are added by the user I need a way of checking to see whether or not a video can be played on the machine. I'm not sure whether or not there is an easy way to try test the file (and catch errors) or if I need to start looking at codecs installed. Does anybody have any experience with this?

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  • Does a child control inherit its parents properties of the same name

    - by Dave Colwell
    Hi all, simple question regarding property value inheritance in UserControls. If i create a UserControl, it has some standard properties like Background, BorderBrush and BorderThickness. Within that UserControl i have a border. I want to know, if i dont specify any set value or binding for the property BorderBrush of that border, will it automatically inherit the value of BorderBrush from the parent control? Thanks!

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  • Trying to re-create UI object from the native iPhone Calendar Notes

    - by FrankOS
    Probably a lame question for a start but i'm trying to re-create the ui object that's used in Apple's native Calendar to create notes. It's the basic text-field but with multiple lines. Sort of a text-area. Now i know that anything from the calendar in terms of ui objects isn't available but i have seen this in quite few apps so i'm guessing it's some sort of standard component. I must be dumb but i just cannot find it. Help please... Thx :)

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  • Two Button Columns on a GridView Control

    - by Bob Avallone
    I have a grid view will two different button columns. I want to perform a different action depending on what button the user presses. How in the SelectedIndexChanged event do I determine what colmun was pressed. This is the code I use to generate the columns. grdAttachments.Columns.Clear(); ButtonField bfSelect = new ButtonField(); bfSelect.HeaderText = "View"; bfSelect.ButtonType = ButtonType.Link; bfSelect.CommandName = "Select"; bfSelect.Text = "View"; ButtonField bfLink = new ButtonField(); bfLink.HeaderText = "Link/Unlink"; bfLink.ButtonType = ButtonType.Link; bfLink.CommandName = "Select"; bfLink.Text = "Link"; grdAttachments.Columns.Add(bfSelect); grdAttachments.Columns.Add(bfLink);

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  • how do you set a property of a control to an address of a function in xaml?

    - by ambog36
    Hi, I have a control that has a "Filter" property that expects a function that defines how the contents of the control should be filtered. so far i am setting the filter in code behind as such: MyControl.Filter = AddressOf Filters.MyFilter In this example MyFilter is a shared function in the Filters class with the following signature: Public Shared Function MyFilter(ByVal obj As Object, ByVal text As String) As Boolean I would like to set this in xaml. I was thinking of setting the Filters.MyFilter as a static resource and setting it that way: ...Filter="{StaticResource myFilter}"/ but i cant set Filters.MyFilter as a static resource. Any ideas on how to achieve this? Thanks,

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  • Disable Adding Item to Collection

    - by Wonko the Sane
    Hi All, I'm sure there's an "easy" answer to this, but for the moment it escapes me. In an MVVM application, I have a property that is a ObservableCollection, used for displaying some set of elements on the view. private readonly ObservableCollection<MyType> mMyCollection = new ObservableCollection<MyType>(); public ObservableCollection<MyType> MyCollection { get { return mMyCollection; } } I want to restrict consumers of this collection from simply using the property to add to the collection (i.e. I want to prevent this from the view): viewModel.MyCollection.Add(newThing); // want to prevent this! Instead, I want to force the use of a method to add items, because there may be another thread using that collection, and I don't want to modify the collection while that thread is processing it. public void AddToMyCollection(MyType newItem) { // Do some thread/task stuff here } Thanks, wTs

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  • What exactly does Panel.IsItemsHost do?

    - by Armentage
    I cannot find any good documentation for the Panel.IstItemsHost attached property. I see plenty of examples of people setting it on the ItemsContainer template for an ItemsControl, but the un-documentation over at MSDN does not explain why or what advantages setting property confers. I have build plenty of containers that do NOT set this property, but have not yet noticed any ill effects.

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  • How to create a shape acting like a textbox?

    - by subho100
    Please refer this control http://www.charlespetzold.com/blog/2009/10/Using-Text-Outlines-in-Silverlight.html The formattedtext control is a shape which helps to generate the shape of the text with proper geometry. I would like to make this control act like a text box with cursors and features like typing in from keyboard. Right now I use an invisible text box with a formattedtext control to act like that. But the cursor position always creates a problem when the size of the text is not equal to the size of the rendered text as shape. Can anyone please show the way to achieve this.

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  • HOW TO RETURN VALUE FROM FUNCTION? (c#)

    - by Ole Jak
    So... I want to return value when C# function is called. I need a code example (simple summ of a,b values will be ok) Please help I need something like this ( I know ActionScript so I will write in it): public function sum(valueA:int, valueB:int):int { var summ:int = valueA + valueB; return summ; } How to translate it into C#?

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  • ASP page get current focused control

    - by Breander
    So what I have is a bunch of dynamically created textboxs that when the user enters some data and either tabs out or clicks out some calculations are done. After the page posts back control focus is lost. What I need is to be able to set focus back to the control that was tabbed to or clicked into not the control that data was entered into.

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  • Bind to several class properties

    - by Polaris
    Hello developers. I have some class with properties firstName and lastName. I want bind TextBlock to concatanation of this two properties. I know that I can create third property that will be return concatanation of these properties. But I dont want to use this approach. Is it possible to Bind TextBlock to two properties. and also I dont want create composite userControl.

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  • From client, force whole page validation

    - by George
    I have an ASP button for which I have set the OnClientClick property to display a javascript confirm message. However, I only want this message to be displayed AFTER all of the client side validations have passed. How can I do this? Essentially, I believe that I need to force Page level validation from the client and then, only if it passes, display the confirmation box.

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  • Steps to take for figuring out the delay when calling service and loading data with the result?

    - by VoodooChild
    Hello, In a client server app, where client front end is done in silverlight using C# and the services are the WCF services. If I am to hit the service and do a query and bring back a result and I notice that it is taking a relatively long time to load my page which is just loading the grid with the data, what things should I look at fix this issue or how would I fix this issue? What steps could I take to determine the problem? where is the bottle-neck, can anyone know from the little information provided here? Does this have anything to do with serialization? Any insight on what could be causing this delay? My service calls are made async. I hope this question makes sense :) Thanks

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