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System windows data error 17 cannot get item value

Data Error: 17 : Cannot get ' Item[ ] ' value ( type ' ValidationError' ) from ' ( Validation. Errors) ' ( type. 年3月 ( 31) · 年2月 ( 17) · 年1月 ( 9) · 年12月 ( 39) · 年11 月 ( 24) · 年10月 ( 14). 通常XAMLアプリケーションを作成し、 バインディングを 利用しているとエラー通知にルールというものを使います。. Data Error: 12 : Cannot get ' ' value ( type ' ValidationError' ) from ' ( Validation. Errors) ' ( type ' ReadOnlyObservableCollection` 1' ). RuntimeMethodHandle. _ InvokeMethodFast( Object target, Object[ ] arguments, SignatureStruct&. Triggers> < / Style> This works fine, but produces some exceptions in the Output window, if the error is corrected after occurring: System. When there are no validation errors, the binding is still trying to access the first element in the ReadOnlyObservableCollection returned by Validation.

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  • Video:Windows error value

    Data item cannot

    Errors, but because it is empty, an exception is thrown. The binding system. Style> < Style TargetType= " TextBlock" > < Style. Triggers> < Trigger Property= " Validation. HasError" Value= " true" > < Setter Property= " ToolTip" Value= " { Binding ( Validation. ErrorContent, RelativeSource= { RelativeSource. appears to be related: System. Data Error: 17 : Cannot get ' Item' value ( type ' String' ) from ' ' ( type ' VatCodeViewModel' ). It' s hard to say without seeing the definition of VatCodeViewModel, but I suspect that property doesn' t exist. You can do it like this: ItemsSource= " { Binding VatCodes} " SelectedValuePath= " VatCode" SelectedValue= " { Binding Item. 例えば、 人材管理、 または社員情報システムを作るなら、 個人情報を登録する画面が あって、 個人名は入力必須にしたいです。. < Window x: Class= " MainWindow" microsoft.

    com/ winfx/ / xaml/ presentation". Oddly it also attempts to make invalid Database changes when I close the window if I change any ComboBox values ( This is. Purely from memory ( so most likely wrong) I think that can also happen when you don' t actually have an. Easiest way to rule this out is to place the adorner layer manually somewhere - you can look at the default Window control template on MSDN to see how it' s used. Data Error: 17 : Cannot get ' Name' value ( type ' String' ) from ' ' ( type ' DataRowView' ). BindingExpression: Path= Name; DataItem= ' DataRowView' ( HashCode= ; target element is ' ComboBox'.