Combobx SelectedItem binding. The DataContext for Window is DataTable.

Question

Hi.

 The DataContext for Window is DataTable.

I tried to set Combobx SelectedItem binding as follows:

SetBinding(ComboBox.SelectedItemProperty, new Binding(row.Table.Columns["Value1"].ColumnName)

But it is not working.

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Pavan Nanduri

Answer 1

Hi Pavan,

Thank you for your post.

>>"SetBinding(ComboBox.SelectedItemProperty, new Binding(row.Table.Columns["Value1"].ColumnName)"

Is it equals to SetBinding(ComboBox.SelectedItemProperty, "Value1")?  If you want bind value from DataTable, you could use follow path.

Suppose I want to show a cell value of first row in a TextBox, I could using following code.

textBox.SetBinding(TextBox.TextProperty, new Binding("Rows[0][Value1]"));

In addition, the value of ComboBox.SelectedItemProperty depends on the ItemSource and ItemTemplate of ComboBox. Please provide the ItemSource of ComboBox for further discussion.

Best Regards,
Li Wang

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Answer 2

Li.

Thanks for reply.

Arraylist is being used as itemsSource for combobox.

ArrayList is a collection of following custom object.

Class Sample

{

public int Code{get; set; };

pubic string Description{get; set;};

}

SelectedValuePath is Code.

DisplayMemberPath is Description.

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Pavan Nanduri

Answer 3

If the ItemsSource of the ComboBox is an ArrayList of Sample objects you should set or bind the SelectedItem property to a Sample object. Or you could set or bind the SelectedValue to an int. You should not set the SelectedItem nor the SelectedValue property to a name of a DataColumn.

If your DataTable contains a code that is present in the ComboBox, you should be able to bind the SelectedValue property to the second column of the first row of the DataTable like this:

comboBox1.SetBinding(ComboBox.SelectedValueProperty, new Binding("[0][1]"));

This assumes that the second column (index = 1) returns a Code (int).

The important thing is that the type of the SelectedValue source property and the SelectedValuePath property is the same.

But please provide all necessary code snippets - including sample data - for anyone to be able to easily reproduce your issue if you need any further help on this.

Hope that helps.

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