Parse method never called when data binding from class property to textedit

[Richard Urwin]

I'm using C# and having problems getting the 'Parse' EventHandler of
my binding object to be called. Interestingly, the 'Format' method is
always called however. A code snippet:

(rdDocument is a private member field of the class and has a
string-type property called 'Name')

Binding bName = new Binding("Text", rdDocument, "Name");
bName.Format += new ConvertEventHandler(teName_Format);
bName.Parse += new ConvertEventHandler(teName_Validate);
textBox1.DataBindings.Add(bName);

private void teName_Format(object sender, ConvertEventArgs e)
{
<perform formatting, OK: method always called>
}

private void teName_Validate(object sender, ConvertEventArgs e)
{
string sValue = (string) e.Value;
<perform validation, PROBLEM: method never called>
}

Can anybody tell me why it's not being called or how I can force it to
be called? Help!
Rich

[Sijin Joseph]

Are you sure the data is getting commited to rdDocument.Name property
without the Parse event getting called. That would be strange indeed.

You may also try calling
teName.DataBindings["Text"].BindingManagerBase.EndCurrentEdit();
incase you are setting the text directly from code.

Sijin Joseph
http://www.indiangeek.net
http://weblogs.asp.net/sjoseph

Richard Urwin wrote:

I'm using C# and having problems getting the 'Parse' EventHandler of
my binding object to be called. Interestingly, the 'Format' method is
always called however. A code snippet:

(rdDocument is a private member field of the class and has a
string-type property called 'Name')

Binding bName = new Binding("Text", rdDocument, "Name");
bName.Format += new ConvertEventHandler(teName_Format);
bName.Parse += new ConvertEventHandler(teName_Validate);
textBox1.DataBindings.Add(bName);

private void teName_Format(object sender, ConvertEventArgs e)
{
<perform formatting, OK: method always called>
}

private void teName_Validate(object sender, ConvertEventArgs e)
{
string sValue = (string) e.Value;
<perform validation, PROBLEM: method never called>
}

Can anybody tell me why it's not being called or how I can force it to
be called? Help!
Rich

[Richard Urwin]

it turns out that i needed to do:

m_bName = teName.DataBindings.Add("Text", m_rdDocument, "Name");

and use this bindings object in the following way:

m_bName.Format += new ConvertEventHandler(teName_Format);
m_bName.Parse += new ConvertEventHandler(teName_Validate);

A bug in C#?

One more thing - i need to prevent the user entering an empty string,
but if the string is empty to start with and doesn't change, the parse
method doesn't get called.

any suggestions?

cheers,
rich

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[Sijin Joseph]

That's strange, i've never had to do it that way. As for the emtpy
string problem, what i usually do is give a default value for the
string, something like '<Name> ' or some other helpful hint.

Sijin Joseph
http://www.indiangeek.net
http://weblogs.asp.net/sjoseph

Richard Urwin wrote:

it turns out that i needed to do:

m_bName = teName.DataBindings.Add("Text", m_rdDocument, "Name");

and use this bindings object in the following way:

m_bName.Format += new ConvertEventHandler(teName_Format);
m_bName.Parse += new ConvertEventHandler(teName_Validate);

A bug in C#?

One more thing - i need to prevent the user entering an empty string,
but if the string is empty to start with and doesn't change, the parse
method doesn't get called.

any suggestions?

cheers,
rich

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!