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I have a set of items, let's say Person:

public class Person : INotifyPropertyChanged, INotifyDataErrorInfo
  // INotifyPropertyChanged and INotifyDataErrorInfo code goes here

  private string name;

  public string Name
      get { return name; }
          name = value;

  private int age;

  public int Age
      get { return age; }
          age= value;

//Validation code

I managed to get the validation working, however I don't know how to display the item's Error when user inputs figure 18 and below as the tooltip because the tooltip shows the viewmodel's errors instead. How can I get the datagridcell tooltip to instead show error of the Person object instead?

Here's the Datagrid code:

<DataGrid ItemsSource="{Binding PersonsList, Mode=TwoWay, UpdateSourceProperty=PropertyChanged}", AutoGenerateColumns="False">
    <DataGridTextColumn Header="Name" Text="{Binding Name, Mode=TwoWay, UpdateSourceProperty=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    <DataGridTextColumn Header="Age" Text="{Binding Age, Mode=TwoWay, UpdateSourceProperty=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />

What I have tried:

I Have no idea what to do here
Gerry Schmitz 29-Jan-21 10:09am
Life would be simpler if you used a form for the CRUD portion.

Also, if you use nameof() instead of hard-coding your property names, you have the benefit of compiler checking and you're also able to list references for that property.
Lyandor 29-Jan-21 20:45pm
Hi, I've never seen binding with nameof before, is the syntax Text="{Binding NameOf(Name).....}"?

I'm not familiar with using forms, are you refering to using Winforms UserControls in the WPF application?
Gerry Schmitz 29-Jan-21 22:21pm
Not in the XAML; in the C# code: e.g. Validate( nameof(Name) ) instead of ... "Name" ...

A "form" (lower case) is an WPF Window, User Control, or Windows Form, that is used to operate on a "single record" versus wrestling with a multi-record data grid for CRUD operations.

Lyandor 29-Jan-21 23:04pm
Ahh yes, very true. However, in users' POV, using forms for DataGrid manipulation is slow. I am required to make every step in the application as simple and straightforward as possible due to low quality manpower here. As such, I will need to rely on direct editing in DataGrid many times in the application.
Gerry Schmitz 30-Jan-21 6:45am
That's a pretty narrow view. My "forms" also page forward, backwards, first record, last record, copy last record, etc. (keyboard short-cuts)

And what happens when the number of "fields" (i.e. "columns") exceeds the width of the screen? Scrolling sideways while editing?

As I said, a pretty narrow view.

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