|
Hi,
In c#, I would like to validate the txtEmail by checking if a valid email address has been entered before moving away from the textbox.
If email is not valid then, txtemail should get the focus again.
The code below is what I have for this purpose but whether or not the email is valid the messagebox appears constantly and does not go away.
CAn you please see what is wrong?
Thanks
private static bool IsEmailAllowed(string text)
{
bool blnValidEmail = false;
Regex regEMail = new Regex(@"^[a-zA-Z][\w\.-]{2,28}[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$");
if (text.Length > 0)
{
blnValidEmail = regEMail.IsMatch(text);
}
return blnValidEmail;
}
private void txtEmail_LostFocus(object sender, RoutedEventArgs e)
{
if (IsEmailAllowed(txtEmail.Text.Trim()) == false)
{
MessageBox.Show("E-Mail expected", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
txtEmail.Focus();
}
}
|
|
|
|
|
Perhaps a better way is to use control validation. Take a look at this article as it seems to heading in the direction you want...
Here
|
|
|
|
|
Thanks for the link, But I have to get this to work in the current event.
Thanks
|
|
|
|
|
arkiboys wrote: But I have to get this to work in the current event.
Why? What requirement could possibly say where you have to get this to work?
|
|
|
|
|
Apologies for mis-understanding...
I would like to see if I can get it to work using the events.
Thanks
|
|
|
|
|
LostFocus event is a bad place to write validation code, try Validating (or Validate) event and set a property on the eventagr to flag a validation failure.
The best course of action would be to use built-in validator controls.
Alternatively your regex could be wrong, try stepping through your code.
|
|
|
|
|
Are you able to see if the regular expression is incorrect?
Thanks
|
|
|
|
|
Google for "Expresso". It's a great tool for writing and testing RegExs, and it's free!
As for your approach. it's bad. You're writing your code from the standpoint that users will do nothing else while your app is running. You are preventing them from possibly leaving your form or closing it without first entering a valid email address. What if they left it blank and want to go back to the previous window??
|
|
|
|
|
There is no validate event.
|
|
|
|
|
Hi,
I have this code:
object o = Csla.Serialization.Mobile.MobileFormatter.Deserialize(bin);
object val = ((Csla.Silverlight.PrimitiveCriteria)o).Value;
As you can see I get some object by deserialization. In this particular case I expect the object that is actually of Csla.Silverlight.PrimitiveCriteria type and I can cast the object in second line as I did above. In this case I know the type of object because I've seen it at debug time. But, what to do if I need to determine the type of object at runtime? What to do in case I want to parametrize the whole process? It means the class I get by deserialization can be different. How can I use that class to cast the object in second line?
Thank you in advance.
Goran Tesic
modified on Tuesday, May 10, 2011 6:19 AM
|
|
|
|
|
Tesic Goran wrote: How can I use that class to cast the object in second line?
I'd suggest to use a shared interface/common base class; if all the deserialized classes share something in common, you can use that to access it. That doesn't mean that you're restricted to a single interface; you can ask the object what interfaces are implemented and act based on that information.
I are Troll 
|
|
|
|
|
Thank you for your answer.
In this case, there's a basic interface that Csla.Silverlight.PrimitiveCriteria class implements, but that interface contains only basic methods. For example, Value property is specific for Csla.Silverlight.PrimitiveCriteria class. Other properties can be specific for other classes. What to do in that case?
|
|
|
|
|
I'd add my own interface. It doesn't have to be implemented in the CSLA-classes, just in the classes that you're going to serialize.
That would give you the option to deserialize 'unknown', check if it matches an known interface and cast it thereto.
I are Troll
|
|
|
|
|
The problem is that I can't change the code in the classes I deserialize. They are all in some DLL that I use in my DLL.
|
|
|
|
|
Tesic Goran wrote: The problem is that I can't change the code in the classes I deserialize.
Are they sealed? If not, inherit, wrap and add an interface 
I are Troll
|
|
|
|
|
If I understand you correctly, I could create new class, for example PrimitiveCriteriaNew that inherits from Csla.Silverlight.PrimitiveCriteria and implements new IInterfaceNew in this way:
public interface IInterfaceNew
{
}
public class PrimitiveCriteriaNew : Csla.Silverlight.PrimitiveCriteria, IInterfaceNew
{
}
And use it in this way:
object o = Csla.Serialization.Mobile.MobileFormatter.Deserialize(bin);
object val = ((PrimitiveCriteriaNew)o).Value;
Is this correct? If so, if I have 1000 classes in that external DLL, I should do the same 1000 times?
|
|
|
|
|
Tesic Goran wrote: Is this correct?
Looks good to me, although I'd suggest you keep the interface-type after the cast, like this;
object o = Csla.Serialization.Mobile.MobileFormatter.Deserialize(bin);
IInterfaceNew val = ((IInterfaceNew)o).Value;
Tesic Goran wrote: If so, if I have 1000 classes in that external DLL, I should do the same 1000 times?
No, you can probably generalize some interfaces in a way that they can be re-used.
I are Troll
|
|
|
|
|
Hi,
Instead of writing :
object o = Csla.Serialization.Mobile.MobileFormatter.Deserialize(bin);
object val = ((Csla.Silverlight.PrimitiveCriteria)o).Value;
You may go with dynamic here: Simple reading and access
dynamic o = Csla.Serialization.Mobile.MobileFormatter.Deserialize(bin);
object val = o.Value;
You don't need to cast it any where
For more details about dynamic you may go on this.
Perform Reflection and XML Traversing Using the dynamic Keyword in C#[^]
This may be helpful to you.
Thank You
|
|
|
|
|
|
i Need to develop a windows service which will log whatever website is visited from the pc where this service will be running. user can use any browser to browse the site but i want my win service will log site name,IP address,time when visit etc. i have no concept how to accomplish this. do i need to read network card. if yes then how extarct all my require data from network card. it is not about any hacking.
tbhattacharjee
|
|
|
|
|
|
Tridip Bhattacharjee wrote: i have no concept how to accomplish this.
Logging traffic (and blocking it) can be done using a firewall or a proxy.
Tridip Bhattacharjee wrote: user can use any browser to browse the site but i want my win service will log site name,IP address,time when visit etc
When I launch MSN Messenger and it starts to fetch the ads - does that count as browsing a website? 
Tridip Bhattacharjee wrote: it is not about any hacking.
You're right, it's about logging - do make sure that the subject knows his/her actions are being logged, or a court might rule otherwise.
I are Troll 
|
|
|
|
|
The standard way to do this is to write a proxy server, or, just use one off-the-shelf. Your program requirements, as you've listed, are not that uncommon.
|
|
|
|
|
How to set the correct mask without promt chars display and right logic to enter IP address without starting zeros and parse it since the returned value are numbers without separating char?
9ine
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
