O'Reilly logo

Mastering Windows Presentation Foundation by Sheridan Yuen

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Avoiding UI-based validation errors

In the last example from the previous section, we data bound the whole Validation.Errors collection to a tooltip in the error template for our textbox. We also data bound our own Errors collection from our base class to the items control above the form fields.

Our Errors collection can display all of the errors for all of the properties in each data model. However, the Validation.Errors collection has access to UI-based validation errors that never make it back to the View Models. Take a look at the following example:

Avoiding UI-based validation errors

The UI-based validation error says Value '0t' could not be converted and that explains why the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required