Re: how to setting Four tier application in my application? - C# Discussion Boards

dirsow4-Oct-12 7:52

4-Oct-12 7:52

Hi,
I made a software with several forms and a few of them have a private constructor and a public static method that is responsible for creating, initializing and showing it. Everything works fine within this application, but now I made another desktop application and I added a reference in this new application to the old one, so I could reuse all forms. Well, every form I call the constructor directly works fine (mdi forms for example), but those "special" classes with private constructors give me an error compiling in release mode, but weirdly it compiles fine in debug mode... Any ideas?

that's how i call

FrmRequestPwd.Show(true, "Solicite uma senha ao seu representante!");

public partial class FrmRequestPwd : Form
{
    private FrmRequestPwd()
    {
        InitializeComponent();
    }

    public static void Show(bool isError, string msg)
    {
        using (FrmRequestPwd frm = new FrmRequestPwd())
        {
            frm.lblMsg.Text = msg;
            frm.Text = isError ? "Erro" : "Aviso";
            frm.txtSerialHD.Text = Kernel32Managed.GetVolumeSerial('C');
            frm.ShowDialog();
        }
    }

    private void btnOK_Click(object sender, EventArgs e)
    {
        Close();
    }
}

Thanks!
Dirso

Re: .exe Reference Problem - maybe

Eddy Vluggen4-Oct-12 9:01

Eddy Vluggen

4-Oct-12 9:01

dirsow wrote:
but those "special" classes with private constructors give me an error compiling in release mode, but weirdly it compiles fine in debug mode... Any ideas?

Compiles fine for me. What did the error say exactly? The message might be kinda helpful. FWIW, debug and release-mode follow the same rules, unless you have some preprocessor-directives in there. I don't see any in this code, so I'm curious about the description of the error you'd get.

Bastard Programmer from Hell Suspicious | :suss:

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

Re: .exe Reference Problem - maybe

dirsow4-Oct-12 9:27

dirsow

4-Oct-12 9:27

I forgot to put the error message:

Quote:
Error 118 The name 'FrmRequestPwd' does not exist in the current context C:\DADOS\SuperControle\Projects\NewSuperControle\SuperControle\Softwares\Appls\SuperControle.Appls.SuperSPED\FrmSuperContabil.cs 95 21 SuperControle.Appls.SuperContabil

Thanks,
Dirso.

Re: .exe Reference Problem - maybe

Eddy Vluggen4-Oct-12 9:34

Eddy Vluggen

4-Oct-12 9:34

Ah, you'll need to add a reference indeed, particular to the project it is mentioning. You're using that form from another assembly, and the assembly it's contained in is not loaded on default.

Bastard Programmer from Hell Suspicious | :suss:

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

Re: .exe Reference Problem - maybe

dirsow4-Oct-12 9:41

dirsow

4-Oct-12 9:41

Hi!
Actually I already did it. I have the reference removed and added again to be sure, but still the same error. there are at least 100 forms in the reference and I use most of them in this new application and the error occurs only with 2 of them, but the weirdst part is in debug mode it works like a charm.

Re: .exe Reference Problem - maybe

Bernhard Hiller4-Oct-12 21:00

Bernhard Hiller

4-Oct-12 21:00

Do your "special forms" use a different namespace? What about

TheNamespace.FrmRequestPwd.Show(true, "Solicite uma senha ao seu representante!");

how to setting Four tier application in my application?

somasundarapandian4-Oct-12 4:28

somasundarapandian

4-Oct-12 4:28

I have already working single tier and three tier application . but i want to create a four tier application in my project solution using C# .If you know any one person this details Plz Send me solution of procedure

Thanks and Regards

S.Somu

7639245585

Re: how to setting Four tier application in my application?

Dave Kreskowiak4-Oct-12 6:45

Dave Kreskowiak

4-Oct-12 6:45

"Tiers" are not a procedural thing. It's a way of thinking. It's organizing your code for seperation of concerns based on the requirements and design of your application. You cannot learn this by looking at someone elses project.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: how to setting Four tier application in my application?

Eddy Vluggen4-Oct-12 9:02

Eddy Vluggen

4-Oct-12 9:02

Why four, and not five?

Bastard Programmer from Hell Suspicious | :suss:

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

Re: how to setting Four tier application in my application?

OriginalGriff4-Oct-12 9:34

OriginalGriff

4-Oct-12 9:34

Heck, let's be generous and let him have 6! Laugh | :laugh:

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

sqldatabaseconnectivity

Member 94545634-Oct-12 4:05

Member 9454563

4-Oct-12 4:05

can you please help me on how to display all the tables on your database on the listbox?

Re: sqldatabaseconnectivity

Ravi Bhavnani4-Oct-12 4:31

Ravi Bhavnani

4-Oct-12 4:31

You can use SMO[^] to read (and manipulate) the structure of your database.

/ravi

My new year resolution: 2048 x 1536
Home | Articles | My .NET bits | Freeware
ravib(at)ravib(dot)com

Re: sqldatabaseconnectivity

Richard MacCutchan4-Oct-12 4:32

Richard MacCutchan

4-Oct-12 4:32

Half the answer[^].

One of these days I'm going to think of a really clever signature.

Re: sqldatabaseconnectivity

palakshamb4-Oct-12 23:28

palakshamb

4-Oct-12 23:28

Execute below sql query agianest your database. It will retrieve all the tables availabale in the database you are using.

SELECT DISTINCT TABLE_NAME FROM information_schema.tables order by TABLE_NAME

Bind the resulted tabel to List box item

ListItem listImet;
lst.Items.Clear();
for (int i = 0; i < dt.Rows.Count; i++)
{
string Text = dt.Rows[i]["TABLE_NAME"].ToString();
listImet = new ListItem(Text);
lst.Items.Add(listImet);
}

Paly

Can an Attribute class find out, to which class it is actually attached?

Andy4114-Oct-12 2:42

Andy411

4-Oct-12 2:42

Background:
To implement localization I have derived from DisplayNameAttribute: LocalDisplayNameAttribute. When using this attribute, I only want to declare the ResourceString an a default string. The class LocalDisplayNameAttribute should find out on it's own, which class and which assembly is using it.

My idea is, to find the strings in related resources by reflection. The strings should allways be in AssemblyName.Properties.Resources.

Is it possible for a attribute class, to find out, who it is used by?

Example:

Assembly LocalizationTools.dll

namespace LocalizationTools
{
    public class LocalDisplayNameAttribute : DisplayNameAttribute
    {
        public LocalDisplayNameAttribute(string resourceName, string defaultText)
            : base(defaultText)
        {
            m_resourceName = resourceName;
        }
        
        public override string DisplayName
        {
            get
            {
                string name = string.Empty;
                try
                {
                    name = SomeVodoo(base.DisplayNameValue);
                }
                catch (Exception)
                {
                    name = base.DisplayNameValue;
                }
                return name;
            }
        }
        
        private string SomeVodoo(string defaultText)
        {
            // Find out to which class an assembly we belong. Then Find the Properties.Resources of the assembly
            // and find the m_resourceName
        }    
    }
}

Assembly SomeClasses.dll

public class Foo
{
    [LocalizationTools.LocalDisplayName("DisplayName_ImportantProperty", "Important property XYZ")]
    public int ImportantProperty { get; set; }
}

And in SomeClasses.Properties.Resources you can find DisplayName_ImportantProperty

PS: I have a IMO less elegant solution by declaring the type.

[LocalizationTools.LocalDisplayName(typeof(SomeClasses.Properties.Resources), "DisplayName_ImportantProperty", "Important property XYZ")]
    public int ImportantProperty { get; set; }
}

Thanks in advance

Andy

Re: Can an Attribute class find out, to which class it is actually attached?

Dave Kreskowiak4-Oct-12 6:56

Dave Kreskowiak

4-Oct-12 6:56

You don't. An atribute should NOT EVER modify its behavior based on the class name it's attached to. The reason is that now your attribute functionality is directly tied to the classes it's looking for. That's bad!

If you need to modify the behavior of the attribute, then you need two or more attributes, one for each behavior.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Can an Attribute class find out, to which class it is actually attached?

Andy4114-Oct-12 20:05

Andy411

4-Oct-12 20:05

Hi Dave,

thanks for your answer.

Well, I did not want to change the behaviour of the attribute. It still should show the DisplayName, Description, Category etc. I only wanted to make it a bit more "smart" regarding localization.

I was just curious, if it is possibly for an attribute to figure out to which class it is attached.

It's ok for me, since I have a solution, inspired by different approaches which can be found here at CP and out in the web.

Re: Can an Attribute class find out, to which class it is actually attached?

BobJanova5-Oct-12 1:15

BobJanova

5-Oct-12 1:15

I'm fairly sure you can't do this without using a typeof(...) to pass it to the attribute's constructor.

Re: Can an Attribute class find out, to which class it is actually attached?

Andy4116-Oct-12 2:25

Andy411

6-Oct-12 2:25

Thx for your answer.

Well, I have to accept my destiny Wink | ;-)

and I'll choose the typeof operator in the constructor.

As I mentioned before, I was just interested if it could be possible

Returning Object From HashTable

AmbiguousName4-Oct-12 1:10

AmbiguousName

4-Oct-12 1:10

Hello. I am using a hastable to store and retrieve class objects. Now I can successfully get an object based on some key but the problem is: I can not return it from within the function. Here is what I am trying

public ClassName FindObject(int nKey)
{
  ClassName obj = new ClassName();
  obj = (ClassName)HashTable[nKey];
  return obj;
}

Now the line (ClassName)HashTable[nKey] is successful to find the required object but obj is still equal to null. Thanks for any input on this.

This world is going to explode due to international politics, SOON.

Re: Returning Object From HashTable

Smart Arab4-Oct-12 1:54

Smart Arab

4-Oct-12 1:54

Hashtable hashtable;
       
        private void button1_Click(object sender, EventArgs e)
        {
            Test t1 = new Test();
            t1.variable = 1;

            Test t2 = new Test();
            t2.variable = 2;

            hashtable = new Hashtable();
            hashtable.Add(1, t1);
            hashtable.Add(2, t2);


            Test tc1 = GetClass(1);
            tc1.ShowVar();

            Test tc2 = GetClass(2);
            tc2.ShowVar();

        }

        public Test GetClass(object id)
        {
            return (Test)hashtable[id];
        }

    }

    public class Test
    {
        public int variable;

        public void ShowVar()
        {
            Console.WriteLine(variable);
        }
    }

Re: Returning Object From HashTable

Member 94836444-Oct-12 1:59

Member 9483644

4-Oct-12 1:59

Can you post the code using the function FndObject?
The code you posted above doesnt seem to have any problems.

Re: Returning Object From HashTable

Manfred Rudolf Bihy4-Oct-12 2:22

Manfred Rudolf Bihy

4-Oct-12 2:22

Why are you creating a new ClassName instance when the variable obj id immediately overwritten in then next statement?
The next thing you don't understand is that trying to retreive a an object via a key from a Hashtablehttp://msdn.microsoft.com/en-us/library/system.collections.hashtable.item(v=vs.80).aspx[^] will return null when there is nothing stored under that key:

MSDN wrote:
The value associated with the specified key. If the specified key is not found, attempting to get it returns a null reference (Nothing in Visual Basic), and attempting to set it creates a new element using the specified key.

So what happens here is that whatever you passed into FindObject as a key has no instance of type ClassName associated with it.

Regards,

— Manfred

"I had the right to remain silent, but I didn't have the ability!"

Ron White, Comedian

Re: Returning Object From HashTable

Bernhard Hiller4-Oct-12 21:05

Bernhard Hiller

4-Oct-12 21:05

Furthermore, the element at nKey may not be of type ClassName or a derived class - then the cast to ClassName will change it to null.

business process management

Sagar Pulidindi4-Oct-12 1:04

Sagar Pulidindi

4-Oct-12 1:04

Hi can anybody plesae tell me is there any opensource BPM for .net rather than www.netbpm.org......

Thanks in advance

modified 5-Oct-12 2:36am.

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