How update cell in a datagrid ?

Question

0.00/5 (No votes)

See more:

Hi. This is my current situation. When I select a single row from my datagrid, and I click on the button, the cell must change value, but it doesn't change anything

XML

<DataGrid
    ItemsSource="{Binding Dati_Viaggio, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True}"
    SelectedItem="{Binding SelectDati_Viaggio, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True}"

    SelectionMode="Single" CanUserAddRows="False"  CanUserDeleteRows="False"
    AutoGenerateColumns="False" HorizontalAlignment="Left" Height="119" Margin="10,10,0,0" VerticalAlignment="Top" Width="497">

    <DataGrid.Columns>
        <DataGridTextColumn x:Name="NumOrd"
            Binding="{Binding Path=NumOrd, Mode=TwoWay, NotifyOnSourceUpdated=True,
            UpdateSourceTrigger=PropertyChanged}"  Header="NumOrd" Width="150" />
    </DataGrid.Columns>
</DataGrid>

And this the vb code

VB

Private Property _NumOrd As String
Public Property NumOrd As String
    Get
        Return _NumOrd
    End Get
    Set(value As String)
        _NumOrd = value
        OnPropertyChanged("NumOrd")
    End Set
End Property

Public Property Dati_Viaggio As ObservableCollection(Of Model_Ricerca_Dati_Viaggio)
Private _SelectDati_Viaggio As Model_Ricerca_Dati_Viaggio
Public Property SelectDati_Viaggio As Model_Ricerca_Dati_Viaggio
    Get
        Return _SelectDati_Viaggio
    End Get
    Set(value As Model_Ricerca_Dati_Viaggio)
        _SelectDati_Viaggio = value
        OnPropertyChanged("SelectDati_Viaggio")

    End Set
End Property

Why, if I write this code the cell doesn't refresh ?

VB

SelectDati_Viaggio.NumOrd = Now.String

OnPropertyChanged("NumOrd")
OnPropertyChanged("Dati_Viaggio")
OnPropertyChanged("SelectDati_Viaggio")

Posted 27-Feb-15 11:17am

antobaro

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Matej Hlatky · Answer 1 · 2015-02-27T23:03:00

It looks that you have absolutely no idea what you are doing.

First, read some documentation about WPF Binding https://msdn.microsoft.com/en-us/library/ms752347.aspx[^] - how it works, what is binding target, binding source and how should it be used. Articles about MVVM sure come in handy.

The main problem (from the code you provided) is that the NumOrd property should be on the Model_Ricerca_Dati_Viaggio class, since DataGrid is bound to the collection of Model_Ricerca_Dati_Viaggios.
Then, you don't need to explicitly invoke none of the OnPropertyChanged in your button click event handler.
Don't forget to set the control's DataContext to the instance of class, which contains Dati_Viaggio and SelectDati_Viaggio properties.

Good habbit is to write code in english and not your native language.
Also by convention, .NET clases should not contain underscores (_).