Assigning a value to an array property via reflection - C# Discussion Boards

Re: server DB

om_metab22-Dec-10 3:11

om_metab

22-Dec-10 3:11

I will develope eboard messenge use to learing and chatting as hotmail messenger but how to create email DB in server

Network Sqlserver ConnectionString

navidsoft27-Nov-10 18:16

navidsoft

27-Nov-10 18:16

hi I have a code in C# and want to use the program in network. the network is WorkGroup and it uses the computers Windows username and password to connect each other. my SQLserver installed in windows Autentication.
my connectionString is like this:
<
<configuration>
<connectionstrings>
<add name="Budget.Properties.Settings.budgetConnectionString2"
="" connectionstring="Data Source=armansql-pc;Initial Catalog=budget;Integrated Security=True" providername="System.Data.SqlClient">

>
and now i can not find the problom. may i ask a help for a little guide?

Re: Network Sqlserver ConnectionString

Roger Wright27-Nov-10 18:41

Roger Wright

27-Nov-10 18:41

Check your instance of SQL Server to see if the Browser Service is active. If it's not, it won't advertise its service on the network. Also - and this is getting vague for me, as I'm not an expert on SQL Server - I think there are limitations on how you address SQL Server. In a Workgroup you're probably using NetBIOS over TCP, which uses the common Windows resource name for a computer. I think that I recall reading somewhere that SQL Server requires a fully qualified domain name in the connection string. Of course, I could be full of sh*t, as I'm tired and fairly drunk, and I'm grasping at vague memories of things I found when I last tried to fix a SQL Server problem; my advice is worth everything it costs, and no more. But you might try looking into those two possible problem sources, nonetheless. [insert crosseyed smiley here]

Will Rogers never met me.

Re: Network Sqlserver ConnectionString

Luc Pattyn27-Nov-10 21:46

Luc Pattyn

27-Nov-10 21:46

This site[^] usually helps me out.

FWIW: I've never needed a providerName

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Re: Network Sqlserver ConnectionString

navidsoft28-Nov-10 2:19

navidsoft

28-Nov-10 2:19

Dear Friends.
My problem is still remaining and i can not find any way for that.
is there any one have had similar problem Or have a sample of that?
its a simple WorkGroup Network and the computers can see each other. but why i cannot make the Connection String?

thanks for all
sincerely

Re: Network Sqlserver ConnectionString

PIEBALDconsult28-Nov-10 4:01

PIEBALDconsult

28-Nov-10 4:01

navidsoft wrote:
i can not find the problom

Neither can I, what are the symptoms?

Re: Network Sqlserver ConnectionString

Dave Kreskowiak28-Nov-10 11:42

Dave Kreskowiak

28-Nov-10 11:42

Installing and using Windows Authentication in a Workgroup environment is a BAD idea. Since every machine in the workgroup, including the SQL Server maintains it's own list of user accounts and passwords AND DOES NOT TRUST ANY OTHER MACHINES ACCOUNT LIST, you are bound to have all kinds of login issues with the SQL Server. You're either going to have to use SQL Server accounts or change your entire network over to a domain setup where there is only ONE list of accounts and SQL Server uses that.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Assigning a value to an array property via reflection

Lutosław27-Nov-10 12:21

Lutosław

27-Nov-10 12:21

Hello,

I have an untyped parameter _target and the following code:

Type T; // type of a property of _target. The type itself is T[]
//, but here I have a type of elements of an array.
List<object> olist; // list where am I going to store array's elements.
IEnumerable<PropertyInfo> subProps; // properties of T

// GetO creates an instance of T and assigns all it's properties.
olist.AddRange(resultSet.Select(result => GetO(T, subProps, result)));
                                
// Here I got ArgumentException
// Object of type 'System.Object[]' cannot be converted to type 'GameEditor.Model.SceneExit[]'.
// In a debugger I can see that all elements of olist are of type T. It is understandable.
// But the list itsefs is still List<object> and therefore SetValue fails
prop.Info.SetValue(_target, olist.ToArray(), new object[0]);

I would have to write a lot of words, but I hope you understand what is the point after reading comments.

Before I posted this, I had came up with another idea:

Type t = ...;
dynamic olist =
    typeof (List<object>).GetGenericTypeDefinition().MakeGenericType(new Type[] {t})
        .GetConstructor(new Type[] {typeof(int)}).Invoke(new object[] {resultSet.Count});
IEnumerable<PropertyInfo> subProps = ...;

foreach (SparqlResult result in resultSet)
    olist.Add(GetO(t, subProps, result)); // fails here this time (parameter doesnt match)
// Although GetO returns an object of correct type, but formally it's still an 'object'
// (dynamic thing is 'too good'...)
                                
prop.Info.SetValue(_target, olist.ToArray(), new object[0]);

I tried also using Convert.ChangeType but with no success.

What would be a working solution? An "anymous" cast would be good, like (type)object, but there is no such thing.

Thanks in advance,

Greetings - Jacek

Re: Assigning a value to an array property via reflection

Lutosław27-Nov-10 13:01

Lutosław

27-Nov-10 13:01

I knew I'd have found an answer. I usually do. Eventually. After some time.

Array.CreateInstance was what I needed.

Type t;
List<object> olist;
IEnumerable<PropertyInfo> subProps;

olist.AddRange(...);
Array instance = Array.CreateInstance(t, olist.Count);
Array.Copy(olist.ToArray(), instance, olist.Count);
prop.Info.SetValue(_target, instance, new object[0]);

Greetings - Jacek

Re: Assigning a value to an array property via reflection

RaviRanjanKr18-Dec-10 21:27

RaviRanjanKr

18-Dec-10 21:27

yup, that's perfect.

tabcontrol with contextMenu

Erdinc2727-Nov-10 1:12

Erdinc27

27-Nov-10 1:12

hey guys..i have my MdiChild form tabbed in main form..and when i right click on the tabpage i want to close the one was right clicked..to do that i drag-drop a context menu and i choose that context menu from properties of my tabcontrol and wrote that codes

private void sekmeyiKapatToolStripMenuItem_Click(object sender, EventArgs e)
       {
           foreach (DetayForm item in this.MdiChildren)
           {
               if (item.tbpg.Equals(tabControl1.SelectedTab))
               {
                   item.Select();
                   item.Close();
                   item.tbpg.Dispose();
               }
           }
       }

it works fine.but when i choose the first opened child form and try to close it all child forms are closed and it close all again when i right click not selected tab..what can i do?

vemedya.com

Re: tabcontrol with contextMenu

Erdinc2727-Nov-10 2:36

Erdinc27

27-Nov-10 2:36

hey again. i solved my problem like below.i found below code in web but i didnt understand exactly what GetTabRect() does?

private void tabControl1_MouseDown(object sender, MouseEventArgs e)
       {
           if (e.Button == MouseButtons.Right)
           {
               for (int i = 0; i < this.tabControl1.TabCount; i++)
               {
                   if (this.tabControl1.GetTabRect(i).Contains(new Point(e.X, e.Y)))
                   {
                       this.tabControl1.SelectedIndex = i;
                       break;
                   }
               }
           }
       }

private void sekmeyiKapatToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (DetayForm item in this.MdiChildren)
            {
                if (item.tbpg.Equals(tabControl1.SelectedTab))
                {
                    item.Close();
                    break;
                }
            }
        }

vemedya.com

Re: tabcontrol with contextMenu

OriginalGriff27-Nov-10 4:24

OriginalGriff

27-Nov-10 4:24

When you don't know what something does, MDSN is the first place to look :GetTabRect method[^]
A simple Google "GetTabRect MSDN" will find it for you...

MSDN says "Returns the bounding rectangle for a specified tab in this tab control." which means it returns a Rectangle which contains the Tab part (on the tab list, has the text describing the tab).

|--------|-----------\
| My Tab | Other Tab |
|-----------------------------------|
|                                   |
|                                   |
|         My Tab Content            |
|                                   |
|                                   |
|                                   |
|-----------------------------------|

It would return the rectangle containing "My Tab", but not "Other Tab" or "My Tab Content"

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

transfer arithmetical operation to executable ascii code

igalep13227-Nov-10 0:16

igalep132

27-Nov-10 0:16

Hello,

I would like to translate arithmetical operation to executable ASCII code.
I mean to find the ascii of '+' operator (lets say it's stored in tmp), and then to execute this operation like

int result += num1; but in the next order int result tmp= num1;

is it possible ?

Thanks

Re: transfer arithmetical operation to executable ascii code

JF201527-Nov-10 0:21

JF2015

27-Nov-10 0:21

Hi,

see this link for dynamic compiling of source code. This will allow you to change your code after the application was compiled.

http://www.west-wind.com/presentations/dynamicCode/DynamicCode.htm[^]

How to use image from button1 and use it in button2

pancakeleh27-Nov-10 0:01

pancakeleh

27-Nov-10 0:01

hello all i am facing a problem that i do not know how to solve so i'm seeking advise here

private void button2_Click(object sender, EventArgs e)
       {
           try
           {
               OpenFileDialog open = new OpenFileDialog();
               open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
               if (open.ShowDialog() == DialogResult.OK)
               {
                   pictureBox2.Image = new Bitmap(open.FileName);
                   textBox2.Text = open.FileName.ToString();

                   Bitmap DatabaseImage = new Bitmap(pictureBox2.Image, 320, 240);
                   pictureBox2.Image = DatabaseImage;
               }

           }
           catch (Exception)
           {
               throw new ApplicationException("Failed loading image");
           }
       }

How do i use the DatabaseImage in another button instead?

Re: How to use image from button1 and use it in button2

nitin bhoyate27-Nov-10 1:51

nitin bhoyate

27-Nov-10 1:51

If You Declare Any Variable in the Event or method ...
That variable will be only accessable in that event or method..
i.e. Scope of that varialble is limited to that mentod of event..
If you want to use any variable(i.e same variable ) in more than two events declare it outside of the scope of menthod.
means declare it in you class
i.e
class abs
{
declare Here variables;or assgn values
method1()
{
}
method2()
{
}

}

so that you can use same variable value in method1 and method 2

In your case databaseImage Variable(Bitmap) is declared in button2_click()
so you can only acces it within button2_click()

Declare databaseImage above all methods and use it in button1_click() as wel as Button2_click().

Re: How to use image from button1 and use it in button2

pancakeleh27-Nov-10 3:18

pancakeleh

27-Nov-10 3:18

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                OpenFileDialog open = new OpenFileDialog();
                open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
                if (open.ShowDialog() == DialogResult.OK)
                {
                    pictureBox1.Image = new Bitmap(open.FileName);
                    textBox1.Text = open.FileName.ToString();

                    Bitmap finalImage = new Bitmap(pictureBox1.Image, 320, 240);
                    pictureBox1.Image = finalImage;
                }

            }
            catch (Exception)
            {
                throw new ApplicationException("Failed loading image");
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                OpenFileDialog open = new OpenFileDialog();
                open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
                if (open.ShowDialog() == DialogResult.OK)
                {
                    pictureBox2.Image = new Bitmap(open.FileName);
                    textBox2.Text = open.FileName.ToString();

                    Bitmap DatabaseImage = new Bitmap(pictureBox2.Image, 320, 240);
                    pictureBox2.Image = DatabaseImage;
                }

            }
            catch (Exception)
            {
                throw new ApplicationException("Failed loading image");
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
}

I want to make use of finalImage and DatabaseImage in button3_Click event how shld i go abt it? i tried declaring above all emthod but it dont seems to be working.
}

Re: How to use image from button1 and use it in button2

Dave Kreskowiak27-Nov-10 3:27

Dave Kreskowiak

27-Nov-10 3:27

Go back and reread the answer you were given. You might even want to pickup a beginners book on C# because it's apparent that you don't understand the basic concepts of "scope". If you want to use finalImage outside of the event handler, it has to be declared outside of the event handler. You then set finalImage's value (bitmap) inside the event handler.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: How to use image from button1 and use it in button2

pancakeleh27-Nov-10 4:22

pancakeleh

27-Nov-10 4:22

i got it alrdy thanks

Re: How to use image from button1 and use it in button2

nitin bhoyate28-Nov-10 17:39

nitin bhoyate

28-Nov-10 17:39

Gud You solved your Query..
You are always welcome for more queries

control webcam for another application

Zvi Balas26-Nov-10 20:45

Zvi Balas

26-Nov-10 20:45

Hi,
i'm writing a small application
and i want to control the webcam for another application that i got on the same PC.

i want to be able to start playing the video, and to stop playing it.

can anyone assist me?

Thanks,
Zvi

Re: control webcam for another application

Dave Kreskowiak27-Nov-10 3:25

Dave Kreskowiak

27-Nov-10 3:25

You can't. First, the device is only available for a single application at a time. Second, any settings your app lays down will be overwritten by the application that is really using the camera. You also cannot control when the other application sets these settings, so it'll quite possibly overwrite whatever you set. The normal operation is to setup the cameras settings right after opening the camera and before starting the cameras video feed. Once the camera is opened, your application cannot get at it to make changes.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: control webcam for another application

Not Active27-Nov-10 3:48

Not Active

27-Nov-10 3:48

Sounds nefarious to me.

I know the language. I've read a book. - _Madmatt

Re: control webcam for another application

RaviRanjanKr28-Nov-10 5:12

RaviRanjanKr

28-Nov-10 5:12

Not getting your question.
we can justice with your question when you did first.

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