Re: Update listbox items when button is clicked - C# Discussion Boards

Re: how to enable the USB COM Port..?

3-Sep-17 23:39

This was posted first and I just wrote a comment about reposting at the QA post.

Jochen Arndt3-Sep-17 23:49

binding datagridview with entity framework

3-Sep-17 23:49

Instead of reposting at QA you should edit your question here or at least answer to provide the additional requested information.

However, in your QA post you had initially some code but removed that. It won't work as shown in that code. While you can store a SP_DEVINFO_DATA returned from SetupDiEnumDeviceInfo in an XML file and read it back, that can't be used for further SetupDI functions when using a different HDEVINFO.

Instead, enumerate again (e.g. using the GUID) to find the disabled device and get a new SP_DEVINFO_DATA structure.

Member 132649363-Sep-17 7:17

Member 13264936

3-Sep-17 7:17

hi. how can i binding datagridview columns with entity framework that

AutoGenerateColumns=false

<pre>var book = context.Books
                .Where(b => b.ISBN == txtISBN.Text).ToList();

            dataGridViewBook.DataSource = book;

Re: binding datagridview with entity framework

Mycroft Holmes3-Sep-17 22:49

Mycroft Holmes

3-Sep-17 22:49

If you turn autogeneratecolumns off then you need to define the columns you want displayed. Have some google foo datagridview define columns - Google Search

Never underestimate the power of human stupidity
RAH

Update listbox items when button is clicked

Mario Lukačić3-Sep-17 2:19

3-Sep-17 2:19

Hi,

I have a program that gives me all result i search and put them in listbox.

My first problem is that it need 1-2 second when i start to search to find me a items.

Second problem is when i update items, it writes in ini file but gives me error when i try to update a listbox with edited item.

<pre>using System;
using System.Windows.Forms;
using IniParser;
using IniParser.Model;
using System.Collections.Generic;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public string myFilePath;
        public string searchItem;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            searchBtn.Enabled = false;
            writeIniBtn.Enabled = false;
            saveBtn.Enabled = false;
            AcceptButton = this.searchBtn;
        }

        private void openIniBtn_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();

            openFile.InitialDirectory = "c:\\";
            openFile.Filter = "INI files (*.ini)|*.ini";
            openFile.Title = "Select a INI file for edit";

            if (openFile.ShowDialog() == DialogResult.OK)
            {
                myFilePath = openFile.FileName; // full path to a file
                
                // enable buttons
                searchBtn.Enabled = true;
                writeIniBtn.Enabled = true;
                saveBtn.Enabled = true;
                openIniBtn.Enabled = false; // disable open ini button
            }
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            // populate listbox with founded items
            List<string> selectedItems = new List<string>();

            string item = listBox1.SelectedItem.ToString();

            if (!selectedItems.Contains(item))
            {
                selectedItems.Add(item);
            }

            // get clicked item value, section / key
            foreach (string i in listBox1.SelectedItems)
            {
                itemIdTxt.Text = i.Split('[', ']')[1];
                nameInput.Text = i.Split('[', ']')[2];
            }

            
        }

        private void searchBtn_Click(object sender, EventArgs e)
        {
            var searchItem = searchInput.Text; // read value from search input
            
            // start ini
            var parser = new FileIniDataParser();
            parser.Parser.Configuration.AllowDuplicateKeys = true;  // allow duplicate keys
            IniData data = parser.ReadFile(myFilePath);             // opens ini and search in it , myFilePath = path to ini file

            listBox1.Items.Clear(); // clear list

            searchItem = searchInput.Text;  // getting data from input to search for
            
            // loop through sections
            foreach (var item in data.Sections)
            {
                // search for string under key 1
                if (item.Keys["1"].IndexOf(searchItem, 0, StringComparison.CurrentCultureIgnoreCase) != -1)
                {
                    // founded items
                    var foundedItems = ($"[{item.SectionName}] {item.Keys["1"]}");
                    
                    // add founded items to list
                    ListBox list = new ListBox();
                    listBox1.Items.Add(foundedItems);
                }
            }
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            var id = itemIdTxt.Text;    // read id
            var name = nameInput.Text;  // read name

            // write to ini file
            var parser = new FileIniDataParser();
            parser.Parser.Configuration.AllowDuplicateKeys = true;
            IniData data = parser.ReadFile(myFilePath);
            data[id]["1"] = name;
            parser.WriteFile(myFilePath, data);

            // update changed item in listbox
            string index = listBox1.SelectedItem.ToString();
            listBox1.Items.Remove(index);
            listBox1.Items.Add(name);
        }

        
    }
}

Richard MacCutchan3-Sep-17 21:14

3-Sep-17 21:14

What is the error, and where does it occur?

Mario Lukačić4-Sep-17 2:31

4-Sep-17 2:31

I get error on this line

string item = listBox1.SelectedItem.ToString();

Error is :
Exception thrown: 'System.NullReferenceException' in WindowsFormsApp1.exe
System.Windows.Forms.ListBox.SelectedItem.**get** returned null.

I open a file, search for item, i get list with founded results.

When i click on item it is show i set it with this 2 lines

itemIdTxt.Text = i.Split('[', ']')[1];
nameInput.Text = i.Split('[', ']')[2];

And when i edit it in nameInput and press Save button it write in ini file and throw me an error.

So problem is in this i supose, when i try to update edited item

// update changed item in listbox
string index = listBox1.SelectedItem.ToString();
listBox1.Items.Remove(index);
listBox1.Items.Add(name);

Jochen Arndt4-Sep-17 3:49

4-Sep-17 3:49

A listbox may have no item selected. You can check that with ListBox.SelectedIndex which returns -1 if no item is selected.

In your last code snippet you are removing the selected item and adding a new one. As a result, there will be no item selected (removing the selected item will remove also the selection).

Note also that using ListBox.Items.RemoveAt passing the index is better (faster) than searching for an item by the string:

int index = listBox1.SelectedIndex;
if (index >= 0)
    listBox1.Items.RemoveAt(index);

Mario Lukačić4-Sep-17 4:01

4-Sep-17 4:01

https://image.prntscr.com/image/SPNK0IBeSiC2dy7kG9W0kw.png

Here is a image for better view and understand of code.

As i imagine the program works is to select a item, split it into 2 sections SECTION and KEY because i need both to update a ini file where i need to use section name to write to ini file as you can see here
<pre lang="c#">
var id = itemIdTxt.Text; // read id
var name = nameInput.Text; // read name

// write to ini file
var parser = new FileIniDataParser();
parser.Parser.Configuration.AllowDuplicateKeys = true;
IniData data = parser.ReadFile(myFilePath);
data[id]["1"] = name;
parser.WriteFile(myFilePath, data);
</pre>

Jochen Arndt4-Sep-17 4:39

4-Sep-17 4:39

But that is not related to my post where I tried to explain while your code fails when trying to access selected item(s) when nothing is selected.

Depending on what you want to do (replace), you might search for the old item, update the selection programmatically to ensure that it is always set (to what should be set), or track the index of the item to be replaced to be used in the button handler.

Mario Lukačić4-Sep-17 5:50

Getting file path and setting to a public variable ?!?!

4-Sep-17 5:50

that seems to be so complicated for beginner.

Mario Lukačić1-Sep-17 8:42

Re: Getting file path and setting to a public variable ?!?!

1-Sep-17 8:42

Hi, i have a problem with setting a file path to a public variable.

So, what my code must do :

- open file
- set full path to a file so i can read it in another function
- in other function open ini file for reading

but i cant get a file path to it

Here is a code ;

using System;
using System.Windows.Forms;
using IniParser;
using IniParser.Model;
using System.Collections.Generic;
using System.IO;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public string myFilePath;
        //string myFilePath;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            searchBtn.Enabled = false;
            writeIniBtn.Enabled = false;
            saveBtn.Enabled = false;
        }

        private void openIniBtn_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();

            openFile.InitialDirectory = "c:\\";
            openFile.Filter = "INI files (*.ini)|*.ini";
            openFile.Title = "Select a INI file for edit";

            if (openFile.ShowDialog() == DialogResult.OK)
            {
                string myFilePath = openFile.FileName;
                // MessageBox.Show("my file path : " + myFilePath); // shows full path to file
                
                // enable buttons
                searchBtn.Enabled = true;
                writeIniBtn.Enabled = true;
                saveBtn.Enabled = true;
                openIniBtn.Enabled = false;
            }
        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count != 0)
            {
                ListViewItem item = listView1.SelectedItems[0];

                string output = item.Text.Split('[', ']')[1];
                string outputt = item.Text.Split('[', ']')[2];
                
                // set name and id
                itemIdTxt.Text = output.ToString();
                nameInput.Text = outputt.ToString();
            }
        }

        private void searchBtn_Click(object sender, EventArgs e)
        {
            MessageBox.Show("my file path : " + myFilePath); // show me a blank message

Richard Deeming1-Sep-17 9:30

Richard Deeming

1-Sep-17 9:30

That's because you've hidden the field with a local variable:

public string myFilePath;

private void openIniBtn_Click(object sender, EventArgs e)
{
    ...
    string myFilePath = openFile.FileName; // <-- This is a local variable. It hides the field of the same name.
    ...
}

Remove the local variable, and use the field instead:

private void openIniBtn_Click(object sender, EventArgs e)
{
    ...
    myFilePath = openFile.FileName; // <-- Since no local variable called "myFilePath" exists, this is the field.
    ...
}

If you want to be absolutely safe, you can even prefix the field name with this. to ensure that it uses the field and not a local variable:

private void openIniBtn_Click(object sender, EventArgs e)
{
    ...
    this.myFilePath = openFile.FileName; // <-- This always uses the field, even if there is a local variable with the same name.
    ...
}

Scopes | Basic concepts | C# Language Reference | Microsoft Docs[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Getting file path and setting to a public variable ?!?!

Mario Lukačić1-Sep-17 9:33

API to https://images.google.com

1-Sep-17 9:33

Thanks man this solved my problem.

JanningJuul31-Aug-17 21:34

JanningJuul

31-Aug-17 21:34

Is there a known API to Google Images[^] so that it is possible to use it automatically with local files?

Re: API to https://images.google.com

Richard MacCutchan31-Aug-17 22:06

IP Address Control in for WPF?

31-Aug-17 22:06

Try the Google developers website.

Member 1319657431-Aug-17 20:58

Member 13196574

31-Aug-17 20:58

I hope someone can help me. I develop my first C# WPF Program and I need an input control for IP Address. To my big surprise there isn't a control for this which I think is pretty strange. In C++ I have something like that.

Okay so far I have read I could use a masked textbox from the extended wpf toolkit. But I have 2 problems with that:

First of all when I use a mask like 000.000.000.000 and someone wants to enter an address like 192.168.1.1 I would get 192.168.001.001 But I don't want to see leading zeros

the second problem is that someone could enter an address like 500.300.400.800. How can I handle this?

Richard MacCutchan31-Aug-17 21:10

31-Aug-17 21:10

wpf ipaddress - Google Search[^].

Member 1319657431-Aug-17 21:17

Member 13196574

31-Aug-17 21:17

Thank you for the link but that's what I did the entire day yesterday but I found no page that answered my 2 questions. Either the links weren't available anymore or they just said that you should use masked textboxes. But non of them has explained how to handle my two problems with the masked text boxes

I also found a dll that offered an IP Address control but I couldn't change the font size for example for the control at all so I can't use it either

Richard MacCutchan31-Aug-17 21:35

31-Aug-17 21:35

Try posting your question in the WPF forum, you may get a better answer.

Bernhard Hiller31-Aug-17 22:24

Bernhard Hiller

31-Aug-17 22:24

Don't you see that an IPv4 address consists of 4 bytes?
Now write a value converter between string and IpAddress which handles that formatting.
That can be based on the following snippet showing both conversions:

IPAddress address = IPAddress.Parse("192.168.1.1");
byte[] bytes = address.GetAddressBytes();
string formatted = $"{bytes[0]:D3}.{bytes[1]:D3}.{bytes[2]:D3}.{bytes[3]:D3}";

Richard Deeming1-Sep-17 2:43

Richard Deeming

1-Sep-17 2:43

Why not just use a normal TextBox control, combined with IPAddress.TryParse[^] to parse the input?

The problem with the old IP address control is that it's limited to IPv4 addresses. If your application ever needs to deal with IPv6 addresses, that control won't work.

IPv6 - Wikipedia[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Why It displays error?

Dave Kreskowiak1-Sep-17 7:52

Dave Kreskowiak

1-Sep-17 7:52

Member 13196574 wrote:
To my big surprise there isn't a control for this which I think is pretty strange

Really? That's a not-so-commonly used control so I'm not surprised it doesn't exist.

On the other hand, up until about seven years ago, WPF didn't have a data grid. Now THAT was a surprise!

System.ItDidntWorkException: Something didn't work as expected.

A guide to posting questions on CodeProject

Click this: Asking questions is a skill.
Seriously, do it.

Dave Kreskowiak

Why It displays error?

sulomila31-Aug-17 20:48

sulomila

31-Aug-17 20:48

I have created SQL store procedure.

 CREATE PROCEDURE spGetMiti (
@engdate varchar(10)
) with encryption AS
BEGIN
   DECLARE @RC int
   DECLARE @RomanDate DATETIME
   DECLARE @PrnLine nvarchar (4000)

   EXEC @RC = [HRDB].[dbo].[s_GetNepaliDate] @engdate, @RomanDate OUTPUT
   SELECT @PrnLine = isnull(CONVERT(nvarchar, @RomanDate, 111), '')
   SELECT @PrnLine [Tarikh]
 END

it displays in correct result after executing store procedure

EXEC spGetMiti '1978/02/03'

Tarikh > 2035/10/21

IN c#, class MtCommom

private string _engdate = string.Empty;
        public string Engdate
        {
            get { return _engdate; }
            set {
                if (value.Length < 10)
                {
                    throw new Exception("Correct date is required");
                } _engdate = value;
            }
        }

        public DataTable GetMiti()
        {
            SqlParameter[] param = new SqlParameter[]
            {
                new SqlParameter("@engdate", _engdate)
            };
            return DAO.GetTable("spGetMiti", null);
        }

in Button Press

MtCommon mtcom = new MtCommon();
     mtxtDOB.Text = string.Empty;
     mtcom.Engdate = mtxtEngDate.Text;
     DataTable dt = mtcom.GetMiti();
     mtxtDOB.Text = dt.Rows[0]["Tarikh"].ToString();

Error Displays
"Procedure or function 'spGetMiti' expects parameter '@engdate', which was not supplied."

Richard MacCutchan31-Aug-17 21:09