Re: get parent and level of the xml node from XPathNavigator - C# Discussion Boards

lukeer19-Jul-11 1:37

19-Jul-11 1:37

Hi experts,

in my application there are two controls DragSource and DragDestination. User can drag objects from DragSource and drop them onto DragDestination.

Now I would like to have some kind of no-drop-zone from DragDestination's border 20 pixels to the inside. Like a frame but within the control, not around it.

DragEnter should fire when the mouse pointer reaches the inner, drag-allowed area.

How can I set the drag area differing from the overall control area?

Ciao,

luker

Re: specify area for Drag'n'Drop

Dave Kreskowiak19-Jul-11 3:59

Dave Kreskowiak

19-Jul-11 3:59

There is no property or function to set the area for a drag and drop operation inside a control.

If you want the DragEnter event raised only within certain borders, you'll have to get creative with control layouts and surround the control that is accepting the drag and drop with other controls, like Panels, that are painted the same color as your target drop control to creat the border.

Another option is to allow the DragEnter, DragHover, DragDrop and DragLeave events to fire as normal and just check the coordinates of the mouse inside your event handler to determine if anything should be done.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: specify area for Drag'n'Drop

Alan N19-Jul-11 4:30

Alan N

19-Jul-11 4:30

Hi,
Handle the DragOver event on the target and set the DragEventArgs.Effect value. The DragDrop event is suppressed when DragEventArgs.Effect is set to None.

private void panel2_DragOver(object sender, DragEventArgs e) {
  Rectangle subRect = Rectangle.Inflate(panel2.ClientRectangle, -20, -20);

  Point p = panel2.PointToClient(new Point(e.X, e.Y));
  Boolean withinSubRect = subRect.Contains(p);
  if (withinSubRect) {
    e.Effect = DragDropEffects.All;
  } else {
    e.Effect = DragDropEffects.None;
  }
}

Alan.

get parent and level of the xml node from XPathNavigator

NarVish19-Jul-11 0:34

NarVish

19-Jul-11 0:34

Hi,

For the below xml, I would like to get the parent and level of the entity node. For example, for the Business entity, token value should be BUSINESS; desc value should be Business News; parent should be PROD; level should be 1. From the below code, I'm getting token and desc values. Kindly guide me to get parent and level values. Thanks in advance.

foreach (XPathNavigator book in topicsXml.CreateNavigator().Select("//Entity"))
{
   string token = book.SelectSingleNode("Token").Value;
   string desc = book.SelectSingleNode("Description").Value;
   string parent = ?
   string level = ?
}
<CodeList>
  <Entity>
    <Token>PROD</Token>
    <Description>prod</Description>---->level 0
    <Entity>
      <Token>BUSINESS</Token>
      <Description>Business News</Description>---->level 1
      <Entity>
        <Token>COS</Token>
        <Description>Company News</Description>---->level 2
        <Entity>
          <Token>ANA</Token>
          <Description>Analyst Ratings</Description>---->level 3
          <Entity>
            <Token>ANAMOVES</Token>
            <Description>Analyst Ratings, Estimates and Target Price Changes</Description>---->level 4
            <Entity>
              <Token>ANACHANGE</Token>
              <Description>Analyst Rating Changes</Description>---->level 5
              <Entity>
                <Token>ANACUT</Token>
                <Description>Analyst Downgrades</Description>---->level 6
                <Entity>
                  <Token>ANACUTEVT</Token>
                  <Description>Analyst Ratings Cut Events, Announcements</Description>---->level 7
                </Entity>
              </Entity>
            </Entity>
          </Entity>
          <Entity>
            <Token>IP</Token>
            <Description>Intellectual Property</Description>---->level 4
            <Entity>
              <Token>COPYRIGHT</Token>
              <Description>Copyrights</Description>---->level 5
            </Entity>
          </Entity>
        </Entity>
      </Entity>
      <Entity>
        <Token>DRGPATENT</Token>
        <Description>Drug Patents</Description>---->level 2
      </Entity>
    </Entity>
  </Entity>

Re: get parent and level of the xml node from XPathNavigator

Mirko198019-Jul-11 1:38

Mirko1980

19-Jul-11 1:38

For the parent node, you can use .. to navigate upward the xml tree (like as it where a directory).
Using your Example, string parent = book.SelectSingleNode("../Token").Value; will get you the parent token of the current entity.

For the depth, you could try to count the number of entity parent nodes, like this:
string level = book.SelectSingleNode("count(ancestor::Entity)").Value;
I don't know if that will give you a 0-based or a 1-based value, you will have to do some tests.

Re: get parent and level of the xml node from XPathNavigator

NarVish19-Jul-11 2:35

NarVish

19-Jul-11 2:35

string parent = book.SelectSingleNode("../Token").Value;

This returns the inner data of xml
value of parent: "PRODprodBUSINESSBusiness NewsCOSCompany NewsANAAnalyst RatingsANAMOVESAnalyst Ratings, Estimates and Target Price ChangesANACHANGEAnalyst Rating ChangesANACUTAnalyst DowngradesANACUTEVTAnalyst Ratings Cut Events, AnnouncementsIPIntellectual PropertyCOPYRIGHTCopyrightsDRGPATENTDrug Patents"

string level = book.SelectSingleNode("count(ancestor::Entity)").Value;

This line thrown exception, "Expression must evaluate to a node-set."
I hope I'll succeed in getting level by using ancestor, by giving correct syntax.
Please let me know how to get the parent value. Thank you

Re: get parent and level of the xml node from XPathNavigator

Mirko198019-Jul-11 4:58

Mirko1980

19-Jul-11 4:58

For the parent, it seems you are selecting a not-leaf node (I'd say an 'Entity' node), so, using value, you are getting the full content of that node, all descendants included.
If you want a string value, you must select a Token or a Description.

For the level, I forgot you can't use scalar function in XPath when selecting nodes. You can simply use Select and then Count the result: int level = book.Select("ancestor::Entity").Count;

Re: get parent and level of the xml node from XPathNavigator

NarVish19-Jul-11 19:01

NarVish

19-Jul-11 19:01

Thank you, Mirko. Its working..

C# Mysql query problem

nighttrain_18-Jul-11 23:16

nighttrain_

18-Jul-11 23:16

Hi there good people !

I've got strange problem with query into C# code to MySQL database. The point is i got this query:

m_insert_cmd2 = new MySqlCommand("INSERT INTO tb_rezerwacja (kwota, ilosc_osob, w_tym_ilosc_dzieci, data_od, data_do, FK_pokoj_id, FK_zamowienie_id) VALUES (, '" + tbPrice.Text + "', '" + tbNumberOfPeople.Text + "', '" + tbChildren.Text + "', '" + tbStartDate.Text + "', '" + tbEndDate.Text + "',  @pokoj_id,  @zamowienie_id)", m_conn);

which is working but put all field in database to NULL without parameters : @pokoj_id and @rezerwacja_id - that's good. All tb.. are editboxes no matter what i write to them it always put nulls in database. I tried a lot of combinations with this query but i can;t do it working 100%.

For example this query works fine (if i put static data) it's all put in database, no nulls:

m_insert_cmd2 = new MySqlCommand("INSERT INTO tb_rezerwacja (kwota, ilosc_osob, w_tym_ilosc_dzieci, data_od, data_do, FK_pokoj_id, FK_zamowienie_id) VALUES (' 345', '3', '3', '0000-00-21', '0000-00-21',  @pokoj_id,  @zamowienie_id)", m_conn);

What i do wrong, please help.
best regards,
nighttrain

Re: C# Mysql query problem

Blue_Boy18-Jul-11 23:32

Blue_Boy

18-Jul-11 23:32

I think here is problem:

nighttrain_ wrote:
VALUES (,

It should be
VALUES (

I Love T-SQL
"VB.NET is developed with C#.NET"
If my post helps you kindly save my time by voting my post.

www.cacttus.com

Re: C# Mysql query problem

nighttrain_18-Jul-11 23:52

nighttrain_

18-Jul-11 23:52

i tried it and the same wrong result, still NULLS

Re: C# Mysql query problem

GuyThiebaut19-Jul-11 1:59

GuyThiebaut

19-Jul-11 1:59

I know this sounds really basic - but have you tried running this in debug mode and outputting the values of these objects:

System.Diagnostics.Debug.WriteLine(tbPrice.Text);
System.Diagnostics.Debug.WriteLine(tbNumberOfPeople.Text);
System.Diagnostics.Debug.WriteLine(tbChildren.Text);
System.Diagnostics.Debug.WriteLine(tbStartDate.Text);
System.Diagnostics.Debug.WriteLine(tbEndDate.Text);

Just to make sure that they contain what you expect them to contain...

Continuous effort - not strength or intelligence - is the key to unlocking our potential.(Winston Churchill)

Re: C# Mysql query problem

nighttrain_19-Jul-11 2:38

nighttrain_

19-Jul-11 2:38

Mayby it's lame but how can I use this debug mode, i create a button and paste Yours:

System.Diagnostics.Debug.WriteLine(tbPrice.Text);
System.Diagnostics.Debug.WriteLine(tbNumberOfPeople.Text);
System.Diagnostics.Debug.WriteLine(tbChildren.Text);
System.Diagnostics.Debug.WriteLine(tbStartDate.Text);
System.Diagnostics.Debug.WriteLine(tbEndDate.Text);

mayby it's lame question but how should i do that?

Re: C# Mysql query problem

GuyThiebaut19-Jul-11 3:05

GuyThiebaut

19-Jul-11 3:05

I don't have the visual studio IDE at work but you will need do something like select debug from a menu at the top and F5 to start debugging - you will also need to open what I believe is called the "output" window.

Best thing is to google how to debug in Visual studio - wish I could be of more help...

Being able to use the debug facilities is a must have skill for C# clickety[^]

Continuous effort - not strength or intelligence - is the key to unlocking our potential.(Winston Churchill)

Re: C# Mysql query problem

PIEBALDconsult19-Jul-11 2:45

PIEBALDconsult

19-Jul-11 2:45

I don't know, a textbox.Text should never be NULL, but there's an awful lot of bad technique there.

0) Use parameters for all the values
1) Don't use strings for numeric and date values
2) Try using NumericUpDowns and DateTimePickers

Re: C# Mysql query problem

nighttrain_19-Jul-11 3:35

nighttrain_

19-Jul-11 3:35

i start debug and open Output Window but it's strange what i saw:

'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities.Sync\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.Sync.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'D:\_Programowanie\_Moje projekty\OKIENKOWE\HMS\HMS\hms\branches\hms.application\bin\Debug\hms.application.vshost.exe', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Data.DataSetExtensions\v4.0_4.0.0.0__b77a5c561934e089\System.Data.DataSetExtensions.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.CSharp.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Deployment\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Deployment.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The thread 'vshost.NotifyLoad' (0x1500) has exited with code 0 (0x0).
The thread 'vshost.LoadReference' (0x954) has exited with code 0 (0x0).
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'D:\_Programowanie\_Moje projekty\OKIENKOWE\HMS\HMS\hms\branches\hms.application\bin\Debug\hms.application.exe', Symbols loaded.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\MySql.Data\5.2.7.0__c5687fc88969c44d\MySql.Data.dll'
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Transactions\v4.0_4.0.0.0__b77a5c561934e089\System.Transactions.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.Wrapper.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'hms.application.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Numerics\v4.0_4.0.0.0__b77a5c561934e089\System.Numerics.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The thread 'vshost.RunParkingWindow' (0x10b8) has exited with code 0 (0x0).
The thread '&lt;No Name&gt;' (0xba8) has exited with code 0 (0x0).
The program '[5072] hms.application.vshost.exe: Program Trace' has exited with code 0 (0x0).
The program '[5072] hms.application.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).

Anyone could look at that and write something about it ?

Re: C# Mysql query problem [modified]

BobJanova19-Jul-11 3:56

BobJanova

19-Jul-11 3:56

Firstly, if at all possible, you should use parameterised queries, and if not, you must escape the contents of those text boxes before creating the query string. At the moment, if those are free text boxes, there is a huge SQL injection hole in this code.

Secondly, you should be using a DateTimePicker or similar for the dates, and using myDateTimePicker.Value.ToString("yyyy-MM-dd") to get them in database format. Edit from the subthread below: If you are using parameterised queries, you should (of course) pass the date as a DateTime. The string formatting is only if you are building a query string. Ideally you should use a numeric text box type as well but inexplicably that doesn't exist in the standard framework.

Thirdly, I suspect the immediate cause of the problem is that the dates are not in a valid format. See what the string you are actually creating really looks like, and compare it to a static query that works.

modified on Thursday, July 21, 2011 1:02 PM

Re: C# Mysql query problem

PIEBALDconsult19-Jul-11 14:22

PIEBALDconsult

19-Jul-11 14:22

BobJanova wrote:
using myDateTimePicker.Value.ToString("yyyy-MM-dd") to get them in database
format

No, don't do that; just put the DateTime in a parameter.

Re: C# Mysql query problem

BobJanova20-Jul-11 11:19

BobJanova

20-Jul-11 11:19

I did start my answer with 'if at all possible, use a parameterised query'. Yes, that is better if it's possible (and it almost always is).

Re: C# Mysql query problem

PIEBALDconsult20-Jul-11 14:18

PIEBALDconsult

20-Jul-11 14:18

Yes, but as a DateTime, not as a String.

Re: C# Mysql query problem

BobJanova21-Jul-11 7:02

BobJanova

21-Jul-11 7:02

I meant that formatter to only be used in the case that the OP couldn't use parameterised queries, so he was building up the query string (where obviously everything must be a string). But you are right, I didn't make that clear, so I'll go and edit my initial message. Thanks!

Re: C# Mysql query problem

sugais19-Jul-11 20:51

sugais

19-Jul-11 20:51

Remove the single quotes for text fields if using alphabets in text. And # symbol to insert date.

Re: C# Mysql query problem [modified]

nighttrain_20-Jul-11 5:43

nighttrain_

20-Jul-11 5:43

i tried to use a new two parameters:

m_insert_cmd2.Parameters.Add("@DateStart", MySqlDbType.DateTime).Value = this.dateTimePicker1.Text;
m_insert_cmd2.Parameters.Add("@DateEnd", MySqlDbType.DateTime).Value = this.dateTimePicker2.Text;

and tried like this:

m_insert_cmd2.Parameters.Add("@DateStart", MySqlDbType.DateTime).Value = this.dateTimePicker1.Text.ToString();
m_insert_cmd2.Parameters.Add("@DateEnd", MySqlDbType.DateTime).Value = this.dateTimePicker2.Text.ToString();

the same problem is communicat:

String was not recognized as a valid DateTime.

my full query look like:

m_insert_cmd2 = new MySqlCommand("INSERT INTO tb_rezerwacja (kwota, ilosc_osob, w_tym_ilosc_dzieci, data_od, data_do, FK_pokoj_id, FK_zamowienie_id) VALUES (' 345', '3', '3', @DateStart, @DateEnd,  @pokoj_id,  @zamowienie_id)", m_conn);

on form i add 2 dateTimepickers like u see and in MySQL database the date fields are in Date format...

modified on Wednesday, July 20, 2011 3:00 PM

Re: C# Mysql query problem

nighttrain_21-Jul-11 21:26

nighttrain_

21-Jul-11 21:26

anyone could answer plz

How to Finding Solutions

Anubhava Dimri18-Jul-11 21:35

Anubhava Dimri

18-Jul-11 21:35

Hello Experts,

If i have a string "abc". then how can i get the shown output

a
b
c
ab
bc
ac
abc

In this output i do't need of ba or cab or cba.

Thanks

If you can think then I Can.

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