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POValidation using IDataError
 

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  1. POValidation using IDataError
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    <p>I have the following validation method in my viewmodel (example is showing only one column, "ItemNumber"):</p> <pre><code>public bool IsValid { get { foreach (string property in ValidatedProperties) if (GetValidationError(property) != null) return false; return true; } } static readonly string[] ValidatedProperties = { "ItemNumber" }; string GetValidationError(string propertyName) { if (Array.IndexOf(ValidatedProperties, propertyName) &lt; 0) return null; string error = null; switch (propertyName) { case "ItemNumber": error = this.ValidateItemNumber(); break; default: Debug.Fail("Unexpected property being validated on ProjectExpense: " + propertyName); break; } // set the status message on the UI to the generated error if (error != null) { ErrorMessage = error; } return error; } // string method static bool IsStringMissing(string value) { return String.IsNullOrEmpty(value) || value.Trim() == String.Empty; } string ValidateItemNumber() { if (SelectedProjectExpenseItem != null) { if (IsStringMissing(SelectedProjectExpenseItem.ItemNumber)) { return "Item number is required"; } if (SelectedProjectExpenseItem.ItemNumber.Length &gt; 50) { return "Item number exceeds 50 characters"; } } return null; } #endregion #region IDataErrorInfo Members string IDataErrorInfo.Error { get { return null; } } string IDataErrorInfo.this[string propertyName] { get { return this.GetValidationError(propertyName); } } </code></pre> <p>The validation fires, but I don't know how to communicate it to my datagrid. I am using a separate Dto (hence SelectedProjectExpenseItem.ItemNumber above, SelectedProjectExpenseItem is my Dto) instead of having the properties directly in my viewmodel. Here is my datagrid:</p> <pre><code> &lt;DataGrid ItemsSource="{Binding Path=ListOfProjectExpenseItems}" AutoGenerateColumns="False" Name="dgProjectExpenseItems" SelectionMode="Single" SelectionUnit="FullRow" CanUserResizeColumns="True" SelectedItem="{Binding Path=SelectedProjectExpenseItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" GridLinesVisibility="Horizontal" CanUserDeleteRows="True" CanUserAddRows="True"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="ID" Width="SizeToCells" MinWidth="50" Binding="{Binding RowID}" /&gt; &lt;DataGridTextColumn Header="Project Expense ID" Width="SizeToCells" Visibility="Hidden" MinWidth="0" Binding="{Binding ProjectExpenseID, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;DataGridTextColumn Header="Item Number" Width="SizeToCells" MinWidth="140" Binding="{Binding ItemNumber, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;DataGridTextColumn Header="Item Description" Width="SizeToCells" MinWidth="250" Binding="{Binding ItemDescription, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;DataGridTextColumn Header="Unit Price" Width="SizeToCells" MinWidth="90" Binding="{Binding ItemUnitPrice, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;DataGridTextColumn Header="Qty" Width="SizeToCells" MinWidth="65" Binding="{Binding ItemQty, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;DataGridTextColumn Header="Supplier Name" Width="SizeToCells" MinWidth="200" Binding="{Binding SupplierName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; </code></pre> <p>I would like to use a style, say with a red border and tooltip stating the error, to signify a problem with the row or cell. Every example I found using styles, however, has the properties directly in the viewmodel, and I cannot figure out how to port it over to my Dto.</p> <p>Any help is appreciated.</p>
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    1. COIn such cases, I've been always wrapping DTO with ViewModel with IDataErrorInfo implementation. But it sounds like you want to keep using just DTO...
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    2. COI am not averse to putting the properties from my dto in my viewmodel, but I would have to rewrite code to do so. Maybe that is the better option...
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    3. CONow that I test it, IDataError isn't even firing on my datagrid columns. I have an bool IsValid property bound to a save button which calls the validation. I may have to rethink this.
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