C# Discussion Boards - CodeProject

ExcellentOrg7-Aug-13 7:57

7-Aug-13 7:57

Will it help if I publish entire parsing code? ... Certainly there is little bit of refactoring that can reduce the lines which I've postponed until it works correctly?

I had omitted code above the for loop because (a) it is working fine (as I coded it). (b) I did not want to post too big code here

How to convert string to form object in c# window application

susanna.floora5-Aug-13 21:37

susanna.floora

5-Aug-13 21:37

Hi,
I'm developing window application ...

My question is simple, i'm getting form name in a string...
now i want to open the form using string name
how to convert string to form object in c# window application

please reply me.........

modified 6-Aug-13 3:44am.

Re: How to convert string to form object in c# window application

ExcellentOrg5-Aug-13 22:34

ExcellentOrg

5-Aug-13 22:34

Some variation of this

Assembly assembly = System.Reflection.Assembly.GetAssembly();
classAsType = assembly.GetType(classNameAsString);

Re: How to convert string to form object in c# window application

Rizny Mubarak5-Aug-13 23:43

Rizny Mubarak

5-Aug-13 23:43

Have you created your form object already? where you want to open that form, can you tell how you want to do, i hope can help you with that

Re: How to convert string to form object in c# window application

Eddy Vluggen6-Aug-13 7:47

Eddy Vluggen

6-Aug-13 7:47

susanna.floora wrote:
My question is simple, i'm getting form name in a string...

The name of a form-object (name property) or the name of the forms' class? In other words, does the form already exist that you're looking for, or are you showing a new instance of that form?

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Re: How to convert string to form object in c# window application

susanna.floora7-Aug-13 19:07

susanna.floora

7-Aug-13 19:07

Form already exists in the application.
form name is in a string.
how do i open that form.

Re: How to convert string to form object in c# window application

ExcellentOrg6-Aug-13 9:22

ExcellentOrg

6-Aug-13 9:22

Assembly assembly = System.Reflection.Assembly.GetAssembly();
classAsType = assembly.GetType(<big>classNameAsString</big>);

classNameAsString as string is where you will type in your form's name as string. After this you obtain constructor using reflection and show the class

Re: How to convert string to form object in c# window application

Jean A Brandelero8-Aug-13 10:45

Jean A Brandelero

8-Aug-13 10:45

Simple:

var t = System.Type.GetType("MyClass.FormName");
var form = Activator.CreateInstance(t);

Re: How to convert string to form object in c# window application

susanna.floora9-Aug-13 2:02

susanna.floora

9-Aug-13 2:02

Thank u ..
it worked

Re: How to convert string to form object in c# window application

Jean A Brandelero9-Aug-13 7:51

Jean A Brandelero

9-Aug-13 7:51

Welcome, upvote it.
Smile | :)

Re: How to convert string to form object in c# window application

BillWoodruff11-Aug-13 0:13

BillWoodruff

11-Aug-13 0:13

I usually don't comment on a question like this, when the OP has a made a comment of the form "it works," in response to a solution.

But, I'd like to note that, imho, Eddie Vluggen asked what I think is the critical question here:

"The name of a form-object (name property) or the name of the forms' class? In other words, does the form already exist that you're looking for, or are you showing a new instance of that form?"

To which the OP responded:

"Form already exists in the application.
form name is in a string.
how do i open that form."

The code shown in the response by Jean Brandelero will create a new instance of the Form based on its class-name. And, perhaps, that is exactly what the OP wanted.

But, it also seems possible the OP does not want to create a new instance, but to "open" an existing Form.

In that case there are two alternatives:

a. the Form instance is already open, and is visible: your done.

Whether an instance of a Form is visible, or hidden, it's in the Application.OpenForms collection. Note that the collection has a very limited set of operators: you can't use something like 'Contains. And, each Form in that collection is in a "vanilla" type-form: you can't automatically assign it to a variable of the type of FormX: you have to cast the result to ProjectName.FormX.

b. the Form instance is now hidden: your job is to 'Show it.

So, now you can define the alternatives here clearly: based on whether, as Eddie was pointing out, the "string" you have contains a Class Name of a Form, or the string contains the name of a form already created as an instance.

You can use Brandelero's code to create a new instance, if that's what you want, and it doesn't matter to you if there already any other instances of the Type that exist.

And, if you want to create an instance only if an instance does not already exist, or you just want to make sure an existing instance is visible: you can mess around with the Application.OpenForms collection to see what's what.

Let's look at simple test case:

// in Form scope
        private Form2 newForm2 = new Form2();
        private Form2 newForm2a = new Form2();

// in Form Load event
        newForm2.Name = "newForm2";
        newForm2.Show();
        newForm2.Hide();

        newForm2a.Name = "newForm2a";
        newForm2a.Show();
        newForm2a.Hide();

        foreach (Form theCandidateForm in Application.OpenForms)
        {
            if (theCandidateForm.Name == "newForm2")
            {
               // you found a match by Name
               Console.WriteLine("Found match by Name: " + theCandidateForm.Name);
            }

            if( theCandidateForm.GetType() == newForm2.GetType())
            {
                // you found one, of perhaps more than one, instance of 'newForm2
                Console.WriteLine("Found match by Type " + theCandidateForm.Name);
            }
        }

The output of this in the VS 'Output window would be:

Found match by Name: newForm2
Found match by Type newForm2
Found match by Type newForm2a

I hope this information adds something to this thread.

“This isn't right; this isn't even wrong." Wolfgang Pauli, commenting on a physics paper submitted for a journal

Re: How to convert string to form object in c# window application

susanna.floora26-Aug-13 21:47

susanna.floora

26-Aug-13 21:47

Thank you

Autocomplete TextBox no find other words in string

juliogyn5-Aug-13 16:49

juliogyn

5-Aug-13 16:49

I have this code for autocomplete:

foreach(string match in myList){
  if( !string.IsNullOrEmpty(text_box1) ){
   
   if( match.StartsWith(text_box1.ToString(),
        StringComparison.CurrentCultureIgnoreCase) ){

        MessageBox.Show(match);
      }
     
   }

}

In String "The follow me", case find "the", the string is show me. But case find "follow" or "Follow", is not show. I'm tried with Contains but not solved. What can i do ?

Re: Autocomplete TextBox no find other words in string

Abhinav S5-Aug-13 17:07

Abhinav S

5-Aug-13 17:07

You are using StartsWith. If you look for "The follow", you will find the string output.

What did you try with Contains?

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Re: Autocomplete TextBox no find other words in string

juliogyn5-Aug-13 18:08

juliogyn

5-Aug-13 18:08

With Contains, when find "follow" is show the complete string. But i try with "the fol" no show more, and "the Follow", example, to not show.

Re: Autocomplete TextBox no find other words in string

Abhinav S5-Aug-13 18:31

Abhinav S

5-Aug-13 18:31

Try using IndexOf - http://msdn.microsoft.com/en-us/library/system.string.indexof%28v=vs.110%29.aspx[^].

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Re: Autocomplete TextBox no find other words in string

juliogyn6-Aug-13 9:18

juliogyn

6-Aug-13 9:18

Solved the problem with "||":

if( match.StartsWith(text_box1.ToString(),
        StringComparison.CurrentCultureIgnoreCase) || match.Contains(text_box1) )

Tanks for all help

Try, Catch, Finally question

JD865-Aug-13 15:15

JD86

5-Aug-13 15:15

I'm writing some DLL's and have a question.

If I throw the exception in the catch block does the finally ever execute? Reason why I am doing this is because the DLL's do not perform logging, the calling class does. But I need to make sure I dispose of my objects.

Example:

SqlConnection conn = null;
SqlCommand cmd = null;

try
{
}
catch (Exception ex)
{
throw;
}
finally
{
if (cmd != null)
cmd.Dispose();

if (conn != null)
conn.Dispose();
}

IS that proper or should I dispose in the catch block AND the finally block because the finally will never execute since i'm rethrowing the exception?

Re: Try, Catch, Finally question

Abhinav S5-Aug-13 16:45

Abhinav S

5-Aug-13 16:45

The finally block will almost always execute - let all dispose methods remain in the finally block.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Re: Try, Catch, Finally question

JD866-Aug-13 6:18

JD86

6-Aug-13 6:18

Thanks! That is what I needed to know! Just wasn't 100% if the finally would execute because I threw the error again in the catch block.

Re: Try, Catch, Finally question

ExcellentOrg5-Aug-13 22:06

ExcellentOrg

5-Aug-13 22:06

Yes.... code in finally block will always execute unconditionally (unless you shut down the PC by pulling the power cord ...)

Re: Try, Catch, Finally question

Bernhard Hiller5-Aug-13 22:46

Bernhard Hiller

5-Aug-13 22:46

JD86 wrote:
make sure I dispose of my objects

In such a case, I prefer a using statement:

using (IDbConnection conn = ...)
{
    using (IDbCommand cmd = ...)
   {
      //do something here
   }
}

Rhe Dispose method of the object will be called when the using block is left - regardless of the reason for leaving.

Re: Try, Catch, Finally question

JD866-Aug-13 6:18

JD86

6-Aug-13 6:18

I don't really like the using method. No way to really catch errors unless you do another try, catch within the using statement and then that is just redundant.

I just stick to try, catch, finally and dispose of everything myself.

Re: Try, Catch, Finally question

Jean A Brandelero8-Aug-13 10:47

Jean A Brandelero

8-Aug-13 10:47

So use finally, it will do exactly you want. Just to reinforce, yes, it runs all the time, in good or bad cases (exceptions).

Click-Once :: Publishing And Updates In Different Locations

Matt U.5-Aug-13 8:17

Matt U.

5-Aug-13 8:17

I have an application which I wrote and I also maintain in my facility. Occasionally I add new features based on management's needs. I have the application setup with a Click-Once deployment. Typically I publish the application to a local server. However, my system is on a wireless connection and for some reason the internal network disappears from my list occasionally, so now I can't connect to publish updates directly (second time this has happened). I know that I can publish locally and click "Updates..." to change the update location if it's different from the publish path. Well, how can I publish to my local system but copy it to the server's publish location via USB flash drive? I mean, do I simply copy/paste the content from the local publish folder to the separate (server) location I specify for updates?

djj55: Nice but may have a permission problem
Pete O'Hanlon: He has my permission to run it.

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