Datagrid does not show bound values from DataTable

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My DataGrid is not showing values from a bound DataTable. Strangely, it still loads the number of rows needed to accomodate all the items in the DataTable.

Here's the model:

C#

private string _productkey;
private int _price, _stock;

public string ProductKey
{
     get {return _productkey;}
     set
       {
          if (_productkey != value)
             _productkey = value;

          OnPropertyChanged("ProductKey");
          OnPropertyChanged("Price");
          OnPropertyChanged("Stock");
       }
}

public int Price
{
     get {return _price;}
     set
       {
          if (_price != value)
             _price= value;

          OnPropertyChanged("Price");
       }
}

public int Stock
{
     get {return _stock;}
     set
       {
          if (_stock != value)
             _stock= value;

          OnPropertyChanged("Stock");
       }
}

In the DataGrid, I just want to show the ProductKey and price, Here is the ViewModel:

C#

private Product _product;
private DataTable dt;

public DataTable ProductPrices
{
     get
       {
          dt.Columns.Clear();
          dt.Rows.Clear();

          dt.Columns.Add("Product Key",string);
          dt.Columns.Add("Price",int);

          dt.Rows.Add("101",null);
          dt.Rows.Add("102",null);
          dt.Rows.Add("201",null);
          dt.Rows.Add("305",null);

          for (int i = 0 ; i < dt.RowCount ; i ++)
            {
               _product.ProductKey = dt.Rows[i][0].ToString();
               dt.Rows[i][1] = _product.Price;
            }

          return dt;
       }
}

finally, here's the xaml for my DataGrid

XML

<DataGrid ItemsSource="{Binding ProductPrice}">

</DataGrid>
<DataGrid.Columns>
<DataGridTextColumn Binding="{x:Null}" ClipBoardContentBinding="{x:Null}" Header="Product Key" IsReadOnly="True"/>
<DataGridTextColumn Binding="{x:Null}" ClipBoardContentBinding="{x:Null}" Header="Price" IsReadOnly="True"/>
</DataGrid.Columns>

What did I miss?

Posted 30-Sep-15 2:44am

Lyandor

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Richard Deeming · Accepted Answer · 2015-09-30T05:15:00

Your ItemsSource is looking for a property called "ProductPrice", but the view-model property is called "ProductPrices". I assume that's just a typo in your question?

The ProductPrices property looks odd - you're clearing and resetting the DataTable every time the property is accessed.

You're also using an instance of your model to read the price, but in the code you've posted, the price is never updated. Have you just omitted some of the code?

The main problem is most likely the bindings on the grid columns, which haven't been set:

XML

<DataGridTextColumn Binding="{x:Null}" ...

These need to be set to proper bindings for the columns you want to display:

XML

<DataGridTextColumn Binding="{Binding Path='Product Key'}" ... />
<DataGridTextColumn Binding="{Binding Path=Price}" ... />

NB: To bind to a column name that contains a space, you need to wrap the name in single quotes. Since the name isn't displayed anywhere, it would be easier to rename the column to ProductKey, without the space.

The code you've posted also has the DataGrid.Columns outside of the DataGrid tag. I assume that's another typo?