C# Discussion Boards - CodeProject

coolfetus11-May-12 17:44

11-May-12 17:44

I am converting from PHP to C# and I might be doing this completely wrong but here goes. I am reading rows from a database with a reader. Then using a foreach command I am walking through the records creating an object and then adding the object to a List<t>. I then return the list to be used for other purposes. But since the object that I am adding to the List is sent by reference it ends up filling the list with the values of the last object added. I am looking for advice on alternate was to fill the List or alternate ways to use the objects. Please try to refrain from just telling me I am and idiot. Be assured I am already aware of this fact. Smile | :)

Thanks to anyone that can offer advice. Below is some of the code. I hope that I posted it OK.

Mark

public object find_by_sql(string sql_statement, Type object_type, database working_database)
            {
            //Using the supplied sql statement query the database and return a reader object.
            working_database.reader = (SqlDataReader)working_database.query(sql_statement);
            //Instantiate a object determined by the calling class using the argument object_type
            object defined_object = Activator.CreateInstance(object_type);
            //Tnstantiate an Array of objects to return.
            List<object> object_array = new List<object>();
            //Step through the returned data rows from the sql statement
            while (working_database.reader.Read())
                {
                Console.WriteLine("Calling Instantiation");
                object_array.Add(instantiate(working_database.reader, defined_object));
                Console.WriteLine("object test = " + defined_object.GetType().GetField("descr").GetValue(defined_object).ToString());
                Console.WriteLine("Returned from Instantiation");
                }
            return (object_array);
            }

        private static object instantiate(SqlDataReader records,object defined_object)
            {
            for (int i = 0; i < (records.FieldCount); i++)
                {
                int one = (int)records.GetInt32(0);
                string two = (string)records.GetName(i);
                var three = records[i];
                //record_values.Add(two, three);
                Console.WriteLine("{0} : {1} - {2}", one, two, three);
                defined_object.GetType().GetField(two).SetValue(defined_object, three);
                //Console.WriteLine("{0}, {1}", working_database.reader.GetInt32(0), String.Format("{0}", working_database.reader[4]));
                //return_value = instantiate(working_database.reader);
                }
            return(defined_object);
            }

Re: Create an object with a string.

Luc Pattyn11-May-12 18:23

Luc Pattyn

11-May-12 18:23

When you read N rows from a database and want all of it stored in some collection such as a List, you obviously need N objects to store all the data; so it takes a new or a CreateInstance or some such inside the loop, you just can't reuse a single object over and over.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

c# tutorial

Shubham Vijay11-May-12 8:41

Shubham Vijay

11-May-12 8:41

please tell me any job for Asp.net in indore. Sigh | :sigh:

shubham vijay

Re: c# tutorial

Ravi Bhavnani11-May-12 9:04

Ravi Bhavnani

11-May-12 9:04

This is [a] forum for programming questions on C# and .NET. Try this[^] site if you're looking for a job in Indore.

/ravi

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

modified 11-May-12 15:26pm.

Displaying XHTML elements with namespaces in .NET WebBrowser control

Orjan Westin11-May-12 5:08

Orjan Westin

11-May-12 5:08

I have an XML document that contains in one element XHTML fragments, specifically one or more p tags, which can contain further XHTML tags such as em, span etc. These are all in an "xhtml" namespace, and the XSD has imported the XHTML strict schema, so all is fine in that regard. My problem is this:

My application needs to display these XHTML paragraphs as a read-only document. My thought was to wrap these in an XHTML document with a namespace specified on the body tag, like this:

HTML

<!-- Pre-amble -->

HTML

<html>
<head>
  <meta http-equiv="content-type" 
    content="application/xhtml+xml;charset=utf-16" />
</head>
<body xmlns:xhtml="http://www.w3.org/1999/xhtml">

HTML

<!-- Elements from XML document -->

HTML

<xhtml:p>Namespaced paragraph from XML</xhtml:p>
<xhtml:p>A partly <xhtml:em>italicised</xhtml:em> paragraph from XML</xhtml:p>

HTML

<!-- Post-amble -->

HTML

</body> 
</html>

This way, I wouldn't have to remove all namespaces from the XHTML elements when putting the document together.

When I give this generated document to the System.Windows.Forms.WebBrowser control (.NET 3.0), the two paragraphs flow together and the em is ignored (the same thing occurs in IE8). In other words, the WebBrowser doesn't unserstand the namespace, and treats xhtml:p as an unknown element and ignores it.

In Firefox, however, the two paragraphs FF they are on separate lines with normal paragraph distance, which is what I expected.

I'm curious from a purely academic point of view whether Firefox or IE8 is in the right here, but am more interested in a pragmatic solution to this problem, if one exists.

Parent child relation through the designer

Ronny Portier11-May-12 4:20

Ronny Portier

11-May-12 4:20

Hi,

I am studying the following control :
C# Custom Control Featuring a Collapsible Panel[^]
I would like to rewrite that control for the 4.0 framework.

This control consists of a headerpanel and in that headerpanel are 2 pictureboxes. When I study the CollapsiblePanel.Designer.cs file I see that the component designer added the parent child relations through Controls.Add statements. How can I achieve this relation through use of the designer. When I drag the panel and picturebox controls on the designer surface the controls get just created an no relation gets added.

Re: Parent child relation through the designer

Dave Kreskowiak11-May-12 7:25

Dave Kreskowiak

11-May-12 7:25

All you do is drop the child control inside the bounds of the parent control. That's it!

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Parent child relation through the designer

BillWoodruff12-May-12 16:54

BillWoodruff

12-May-12 16:54

If you are using a custom control (i.e., a UserControl), and you've placed an instance of it on the design-surface at design-time, it will not exhibit the behavior of other native C# container controls: where drag-dropping another control ... from the ToolBox ... into the container automatically makes the dropped control a child of the container.

Look for an article here on CP by Henry Minute explaining how to enable this "swallow dropped controls and make them children of the container" for custom controls used at design-time, and look for comments by me here on CP, suggesting the possibility of a simpler solution.

best, Bill

"Humans are amphibians ... half spirit and half animal ... as spirits they belong to the eternal world, but as animals they inhabit time. This means that while their spirit can be directed to an eternal object, their bodies, passions, and imaginations are in continual change, for to be in time, means to change. Their nearest approach to constancy, therefore, is undulation: the repeated return to a level from which they repeatedly fall back, a series of troughs and peaks.” C.S. Lewis

Picturebox and Progressbar question

Hagen McCarthy11-May-12 4:13

Hagen McCarthy

11-May-12 4:13

I have a win form that you can click a browse button - navigate to your image file - and view the image in the win form. I've been trying to associate my progress bar to the load time of the image selected with no success. Can anyone take a look at my code and see what I'm missing?

private void startButton_Click(object sender, EventArgs e) //Opens file browsing dialog
       {
               OpenFileDialog open = new OpenFileDialog();
               open.FileName = "";
               open.Filter = "Image Files(*.tif; *.jpg; *.jpeg; *.gif; *.bmp)|*.tif; *.jpg; *.jpeg; *.gif; *.bmp";
               open.InitialDirectory = @"g:\All Scanned Jobs\";
               if (open.ShowDialog() != DialogResult.Cancel)
               {
                   // display image in picture box
                   pictureBox1.Image = new Bitmap(open.FileName);
                   pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
                   pictureBox1.WaitOnLoad = false;
                   pictureBox1.LoadAsync(open.FileName);
               }
       }
       void pictureBox1_LoadProgressChanged(object sender, ProgressChangedEventArgs e) //Sets pBar value as file opens
       {
           progressBar1.Value = e.ProgressPercentage;
       }

Re: Picturebox and Progressbar question

Sentenryu11-May-12 4:32

Sentenryu

11-May-12 4:32

make sure the pictureBox1_LoadProgressChanged method is associated with the pictureBox event, i tested your code here and it works without modifications, have you tried to put a breakpoint into the pictureBox1_LoadProgressChanged method?

I'm brazilian and english (well, human languages in general) aren't my best skill, so, sorry by my english. (if you want we can speak in C# or VB.Net =p)

Re: Picturebox and Progressbar question

Hagen McCarthy11-May-12 4:39

Hagen McCarthy

11-May-12 4:39

I have this in my Form1.Designer.cs code.

//
// pictureBox1
//
this.pictureBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.pictureBox1.BackColor = System.Drawing.SystemColors.ButtonFace;
this.pictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.pictureBox1.ImageLocation = "";
this.pictureBox1.Location = new System.Drawing.Point(13, 71);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(1303, 701);
this.pictureBox1.TabIndex = 3;
this.pictureBox1.TabStop = false;
this.pictureBox1.LoadProgressChanged +=new System.ComponentModel.ProgressChangedEventHandler(pictureBox1_LoadProgressChanged);

Is that where it needs to be?

Re: Picturebox and Progressbar question

Sentenryu11-May-12 5:06

Sentenryu

11-May-12 5:06

your code are exactly the same as mine, still, works fine, the image loads pretty fast, so the progressbar moves fast, but stops at 100% you said that a breakpoint don't helped, what was the behavior? the method isn't being called? the image isn't loading?

I'm brazilian and english (well, human languages in general) aren't my best skill, so, sorry by my english. (if you want we can speak in C# or VB.Net =p)

Re: Picturebox and Progressbar question

Hagen McCarthy11-May-12 5:10

Hagen McCarthy

11-May-12 5:10

The break gives me this:

ImageViewer.exe!ImageViewer.Form1.pictureBox1_LoadProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) Line 71 + 0x5 bytes C#

ImageViewer.exe!ImageViewer.Program.Main() Line 18 + 0x1d bytes C#

I'm using 2010 Express of visual studio would that have anything to do with it?

Re: Picturebox and Progressbar question

Hagen McCarthy11-May-12 5:21

Hagen McCarthy

11-May-12 5:21

And everything works just fine except I do not see the progress bar fill up at all and once the image is done loading completely I still dont see any green.

Re: Picturebox and Progressbar question

Hagen McCarthy11-May-12 4:59

Hagen McCarthy

11-May-12 4:59

And a breakpoint didn't come up with much help.

Re: Picturebox and Progressbar question

BobJanova11-May-12 6:37

BobJanova

11-May-12 6:37

Did you set the Maximum on the progress bar to be something sensible?

Re: Picturebox and Progressbar question

Hagen McCarthy11-May-12 7:37

Hagen McCarthy

11-May-12 7:37

I have the Min set to 0 and the Max set to 100.

Re: Picturebox and Progressbar question

Alan N11-May-12 7:28

Alan N

11-May-12 7:28

Member 8956301 wrote:
// display image in picture box
pictureBox1.Image = new Bitmap(open.FileName);
pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
pictureBox1.WaitOnLoad = false;
pictureBox1.LoadAsync(open.FileName);

OK, let's break this code down line by line
1) Open the file, create a bitmap and set as the picturebox image
2) Set size mode
3) tell picturebox that future image loading will be async
4) Do async load from the file, this is now reloading

So you are loading the image twice.

I think all you need is

pictureBox1.WaitOnLoad = false;
pictureBox1.LoadAsync(open.FileName);

Alan.

Re: Picturebox and Progressbar question

Hagen McCarthy11-May-12 7:38

Hagen McCarthy

11-May-12 7:38

Thanks for catching that for me. I've made that corrections but the progress bar still does nothing.

Re: Picturebox and Progressbar question

Dave Kreskowiak12-May-12 4:33

Dave Kreskowiak

12-May-12 4:33

So how long is it taking to load the image?? The ProgressChange event if only fired every once in a while, not on every byte that's loaded. It may not even be fired at 100% either.

There's a second event that you can handle to get notified that the image is completely loaded. That's the LoadCompleted event. When this one is raised, you can set your progress bar to 100% and consider the operation done.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Picturebox and Progressbar question

Hagen McCarthy14-May-12 2:27

Hagen McCarthy

14-May-12 2:27

It's taking a good 10 to 12 seconds to open.

Web Camera Application using C#

austinwales11-May-12 3:14

austinwales

11-May-12 3:14

I need help with an SDK to develop an application that will work with the built in camera or any external camera. The camera should be able to take snapshots.. This application will of course be used on windows and will be programmed with C#..

Re: Web Camera Application using C#

Ravi Bhavnani11-May-12 3:25

Ravi Bhavnani

11-May-12 3:25

What part of the app do you need help with? Please indicate what you've tried and ask a more specific question if possible. This will allow us to help you better.

/ravi

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

Re: Web Camera Application using C#

Sentenryu11-May-12 4:41

Sentenryu

11-May-12 4:41

i know i shouldn't do this (post here), but actually i'm interested in this kind of thing to, you have any material about how to connect to built-in web cams from c#? or a starting point? i've only found unmanaged solutions, so if you have any managed solution, please share... Smile | :)

I'm brazilian and english (well, human languages in general) aren't my best skill, so, sorry by my english. (if you want we can speak in C# or VB.Net =p)

Re: Web Camera Application using C#

Eddy Vluggen11-May-12 5:46

Eddy Vluggen

11-May-12 5:46

Sentenryu wrote:
or a starting point?

Did you try to search this site? We got a lot of articles on webcam's, and most of them are in managed code.

Bastard Programmer from Hell Suspicious | :suss:

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.