Strange behaviour of DataRowView.PropertyChanged event together with BindingSource

microsoft.public.dotnet.framework.adonet

27 Feb 2006 8:57 AM

svestin

Hi all!

It looks like I have some strange behaviour of the
DataRowView.PropertyChanged event.

In the windowsform example below I have a typed dataset (ds1) with one
table (Table1) that has one column (Col1).

Pressing the button btnTest, I add an event handler for the
PropertyChanged event for the DataRowView of the first row in Table1.

Then I change the value from "AAA" to "CCC".

Normally this results in a fired event (drvTest_PropertyChanged called)

However, if there's been a BindingSource that has its DataSource and
DataMember properties set, the event is NOT fired ??????

private void Form1_Load(object sender, EventArgs e)
{
    //Two rows of test data
    ds1.Table1.AddTable1Row("AAA");
    ds1.Table1.AddTable1Row("BBB");

    //Results in an event when btnTest pressed
    //bindingSource1.DataSource = ds1.Table1.DefaultView;

    //Results in an event when btnTest pressed
    //bindingSource1.DataSource = ds1.Table1;

    //But using these 2 lines results in NO event       <===
    bindingSource1.DataSource = ds1;
    bindingSource1.DataMember = "Table1";
}

private void btnTest_Click(object sender, EventArgs e)
{
    // Get the DataRowView from the first row
    DataRowView drvTest = ds1.Table1.DefaultView[0];

    //Add event handler for PropertyChanged (on the DataRowView
    drvTest.PropertyChanged +=
        new PropertyChangedEventHandler(drvTest_PropertyChanged);

    // Change the first row (Col1); And this should fire an event
    ds1.Table1[0]["Col1"] = "CCC";

    // Use this line to change the value and there will be
    // no events at all if the bindingSource1.DataSource is set.
    //drvTest["Col1"] = "CCC";

}

void drvTest_PropertyChanged(object sender,
                         PropertyChangedEventArgs e)
{
    MessageBox.Show("I got an event");
}

Anyone out there with any suggestions?
Can the DataRowView.PropertyChanged event be trusted?
Any important information that I have missed?

Regards
/Stefan Vestin