System.windows.data error 7 convertback cannot convert value

System.windows.data error 7 convertback cannot convert value

Nothing special going on. When I delete the value from the textbox and tab out, I see the following binding error:. Data Error: 7 : ConvertBack cannot convert value '' type 'String'.

FormatException: Input string was not in a correct format. CultureInfo culture. ToString. IsNullOrEmpty strVal. Parse strVal. I'm not sure what you mean by implementation. We got almost the same problem in our application.

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The Binding is to a VMContact. In normal C we could say. Ask a question. Quick access. Search related threads.

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system.windows.data error 7 convertback cannot convert value

Sign in to vote. I have a textbox on a form that binds to a property of type Int Code Snippet. Thursday, January 24, AM. Looking at the exception, it looks like your guess was correct The default converter can't convert an empty string to an integer.

I would suggest you write your own converter to convert integer strings or empty strings to ints. Change the binding as follows: Code Snippet. ToString ; if string. IsNullOrEmpty strVal return 0. Thursday, January 24, PM.

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Thanks for the converter example. I think your methods were backwards. Sunday, January 27, AM. Can you supply the implementation for Numofitems in the Path? Why can't WPF convert this one?

Binding Error for RadComboBox in DataForm

I've now written this stupid converter and suddenly it works. Data; using Diartis. Friday, August 27, AM.Posted 28 Aug Link to this post. Posted 31 Aug Link to this post. Posted 01 Sep Link to this post. Posted 04 Sep Link to this post.

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All Products. Feed for this thread. Matt Duffield. Member since: Jul When the DataForm is displayed with a RadComboBox, I always get the following error even the it is showing the correct value: Can't convert type null to type System. Looking at my output window I see that it is throwing a System. InvalidOperationException: Can't convert type null to type System. Valeri Hristov Admin. If this does not help, please, send us a simple application that can be used to reproduce the problem and we will respond with a solution ASAP.

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system.windows.data error 7 convertback cannot convert value

Posted 31 Aug Link to this post Hi Valeri. It is coming up with the correctly selected item but the DataForm is showing an error with an ErrorSummary.

Since the underlying record actually does have a valid entry, I would have not expected this to happen. What must I do to get this to work properly? Posted 01 Sep Link to this post Hi Matt, Could you please, prepare a simple application that can be used to reproduce the problem? You can attach an application to a new support ticket, the forums attachments are disabled.

Posted 01 Sep Link to this post Valeri. This application uses Prism V2, Ria Services, etc. I believe that the XAML should give you a good indication as to what is going on. Basically the screen has three regions, a Table selector region which is a DataGrid; a Field selector region which is a DataGrid; a DataForm that allow editing of the Fields. Posted 04 Sep Link to this post Hello Matt, I created a simple application that successfuly reproduces the problem you are getting.

I figured that the exception could be thrown when the combo box cannot find a value to select. I will try to explain the reason for this problem: - initially RadComboBox does not have items.

They come with some delay because they are retrieved from a web service.Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Already on GitHub? Sign in to your account. Transferred from - I think this is a feature request? Also needs checking against the windows Xaml binding implementation.

If you bind to a decimal? It throws during MakeSafeValue: Full stack trace with latest source code:. Parse System. ToInt32 System. ToType System.

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Object value, System. ChangeType System. MakeSafeValue System. Type propertyType, System. SetValue System. Also possibly linked to general validation request The text was updated successfully, but these errors were encountered:.

Playing a bit more, I realized adding empty spaces would still throw errors although the view model property would still be nullso maybe check for whitespace instead: if propertyType. One side question I've had here is whether to use double. I could see that if the underlying type was not nullable, makes sense.

For int or decimal could return MinValue. Thought some more on this, based on experience, it makes more sense to return default T. Magic values have a way of making things messy.Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search.

When filling in the textboxes, no problem is shown. In fact, the Save button won't work. But as soon as I'm clicking on the empty datagrid to be able to add some data, I receive following errors in the immediate window:. Learn more. Asked 5 years, 9 months ago. Active 1 year, 3 months ago.

Viewed 1k times. But as soon as I'm clicking on the empty datagrid to be able to add some data, I receive following errors in the immediate window: System. NamedObject worden geconverteerd. Improve this question. CDspace 2, 17 17 gold badges 31 31 silver badges 35 35 bronze badges. Deschuytterp Deschuytterp 9 9 bronze badges. Please post the XAML code where you bind the datagrid items, along with the properties you're binding to. Thx for your reply, i added the needed code. Does the type of SelectedTestConfiguration.

SelectedComponent have a default constructor? Otherwise it seems that WPF can't directly cast that type at runtime, I'd try to add a converter similar to this: stackoverflow. Deschuytterp There's no answer listed but the solution was in the article pointed to by Lennart though the URL is now stackoverflow. Lennart should be given the Answer credit.

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system.windows.data error 7 convertback cannot convert value

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Survey questions for outdated answers. Linked Related 1. Hot Network Questions.A converted value. If the method returns nullthe valid null value is used. The data binding engine calls this method when it propagates a value from the binding target to the binding source. The implementation of this method must be the inverse of the Convert method. The data binding engine does not catch exceptions that are thrown by a user-supplied converter.

Any exception that is thrown by the ConvertBack method, or any uncaught exceptions that are thrown by methods that the ConvertBack method calls, are treated as run-time errors. Handle anticipated problems by returning DependencyProperty.

A return value of DependencyProperty. UnsetValue indicates that the converter produced no value and that the binding uses the FallbackValueif available, or the default value instead. A return value of Binding. DoNothing indicates that the binding does not transfer the value or use the FallbackValue or default value. Skip to main content. Contents Exit focus mode. IValue Converter.

Data Assembly: PresentationFramework.

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system.windows.data error 7 convertback cannot convert value

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