WPF Databinding Textbox to DataTable

Question

Hi All,

I'm having a problem trying to get a Textbox to update a datatable cell. The binding works correctly oneway, but it does not update the table when the UI changes.
I am using VS2019 WPF/C#

Binding Code Example:

    <TextBox  Grid.Column="2" Grid.Row="2" Margin="5,5" ToolTip="{Binding Parameters[41]}" x:Name="DiameterLowerRoll1">
        <Binding Path="CreatedRecipe.RecipeData.Rows[41][2]" UpdateSourceTrigger="PropertyChanged"  Mode="TwoWay">
            <Binding.ValidationRules>
                <Validate:RangeValidationRule Minimum="300" Maximum="650"  ValidatesOnTargetUpdated="True"/>
            </Binding.ValidationRules>
        </Binding>
    </TextBox>

The ViewModel parameter is bound to a custom class:

    public Recipe CreatedRecipe
    {
        get { return createdRecipe; }
        set {
            createdRecipe = value;
            OnPropertyChanged(nameof(CreatedRecipe));
            }
    }

As I said before, this works correctly when the Recipe is set. I'm not too fussed about property changed firing for the textbox changing, but I do need the data to be recorded in the table.

Any help is appreciated.

Regards

Answer 1

@Mark Wiegold , Based on your description, you want to update the datatable when the textbox's property ToolTip is changed.

I used the following code to do it successfully, but I didn't use MVVM to do it.

  public partial class MainWindow : Window  
    {  
     
        DataTable table = new DataTable();  
        public MainWindow()  
        {  
            InitializeComponent();  
  
            table.Columns.Add("FirstName");  
            table.Columns.Add("Address");  
            table.Columns.Add("Description");  
            table.Rows.Add("test1", "Home", "d1");  
            table.Rows.Add("test2", "Company", "d2");  
            table.Rows.Add("test3", "Home", "d3");  
            table.Rows.Add("test4", "Home", "d4");  
  
            Binding bindMyColumn = new Binding();  
            bindMyColumn.Source = table;  
            bindMyColumn.Path = new PropertyPath("Rows[2][0]");  
            bindMyColumn.Mode = BindingMode.TwoWay;  
            DiameterLowerRoll1.SetBinding(TextBox.ToolTipProperty, bindMyColumn);  
          
  
        }  
  
        private void btntest_Click(object sender, RoutedEventArgs e)  
        {  
            DiameterLowerRoll1.ToolTip = "test3333";  
           
        }  
  
         
    }  

Result:

Hope mu solution could help you.

Best Regards,
Jack

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