C# Discussion Boards - CodeProject

Re: system.reflection.targetinvocationexception when pas null referecne to COM

yanghua944-Apr-12 22:57

yanghua94

4-Apr-12 22:57

I tried IntPtr, but it still not work

object value = IntPtr.Zero;
host.GetType().InvokeMember(_Name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.SetProperty
, null, host, new object[] { value });

System.Reflection.TargetInvocationException
Message=""
Source="mscorlib"
StackTrace:
System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
Host.Net.AxPictureTest.ClearPicture(Object target)

help needed for Virtual memory

tatsat4-Apr-12 19:27

tatsat

4-Apr-12 19:27

How to enable the system managed size of virtual memory using WMI in C#?Kindly help me out how to proceed with it.

How to edit textbox that is bound with int

kruegs354-Apr-12 10:50

kruegs35

4-Apr-12 10:50

I am using the entity framework to retrieve data from a database. I pull a collection of objects and bind them to textboxes. The problem I am having is when I try to edit the textbox that is bound to an integer field. Any changes I make to the textbox are changed back to the original value when the textbox is exited. Anyone have a solution to this, beside changing all my database columns to varchar?

Re: How to edit textbox that is bound with int

JOAT-MON4-Apr-12 14:22

JOAT-MON

4-Apr-12 14:22

You could try to create a custom UserControl that has a TextBox and a bindable property[^] on it to translate the the textbox.Text field into an integer:

[System.ComponentModel.DefaultBindingProperty("NumericText")]
public partial class NumericTextBox : UserControl
{
    public NumericTextBox ()
    {
        InitializeComponent ();
    }

    public int NumericText
    {
        get { return Convert.ToInt32(this.textbox1.Text); }
        set { this.textbox1.Text = value.ToString(); }
    }
}

Jack of all trades ~ Master of none.

Re: How to edit textbox that is bound with int

kruegs355-Apr-12 5:11

kruegs35

5-Apr-12 5:11

OK, tried that and it still did not work. I do have some details though. It seems that when I exit the textbox, the attribute from the ObjectContext is going to the "get" instead of the "set", so it just returns the original value.

[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
        public Nullable Discount
        {
            get
            {
                return _Discount;
            }
            set
            {
                OnDiscountChanging(value);
                ReportPropertyChanging("Discount");
                _Discount = StructuralObject.SetValidValue(value);
                ReportPropertyChanged("Discount");
                OnDiscountChanged();
            }
        }
        private Nullable _Discount;
        partial void OnDiscountChanging(Nullable value);
        partial void OnDiscountChanged();

Re: How to edit textbox that is bound with int

JOAT-MON6-Apr-12 8:28

JOAT-MON

6-Apr-12 8:28

I wonder if it would help to cast the value or specify the underlying type of the Nullable object:

private Nullable<Int32> _Discount;

Jack of all trades ~ Master of none.

IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie4-Apr-12 10:46

CCodeNewbie

4-Apr-12 10:46

Hi,

May I have some fresh eyes please?

Under a Windows service running as LocalSystem, on a 60 second timed interval, I am running the following:

//set & call process netstat -ano
Process Ns = new Process();
ProcessStartInfo startInfo = new ProcessStartInfo("netstat");
startInfo.Arguments = "-ano";
startInfo.UseShellExecute = false;
startInfo.RedirectStandardOutput = true;
startInfo.CreateNoWindow = true;
Ns.StartInfo = startInfo;
Ns.Start();
Ns.WaitForExit();
for (int i = 0; i < 4; i++)
Ns.StandardOutput.ReadLine();
while (true)
    {
    string Line = (Ns.StandardOutput.ReadLine());
    if (!string.IsNullOrEmpty(Line))
    {
//remove all spaces/padding/charactes so that only spaces remain between values
        Line = Line.Trim();
        Line = Line.Replace("        ", " ");
        Line = Line.Replace("       ", " ");
        Line = Line.Replace("      ", " ");
        Line = Line.Replace("     ", " ");
        Line = Line.Replace("    ", " ");
        Line = Line.Replace("   ", " ");
        Line = Line.Replace("  ", " ");
        Line = Line.Replace("  ", " ");
        Line = Line.Replace("  ", " ");
        Line = Line.Replace(":", " ");
        Line = Line.Replace('\r', ' ');
        Line = Line.Replace('\n', ' ');
        string[] s = Line.Split(' ')
//tcp protocol has 7 values, udp connections to external IP address have 7 values
        if (s.Length == 7)
            {
//insns is a sqlcommand - this works faultlessly every time 
            insns.Parameters["@Protocol"].Value = s[0];
            insns.Parameters["@LocalHost"].Value = s[1];
            insns.Parameters["@LocalPort"].Value = s[2];
            insns.Parameters["@RemoteHost"].Value = s[3];
            insns.Parameters["@RemotePort"].Value = s[4];
            insns.Parameters["@State"].Value = s[5];
            insns.Parameters["@PID"].Value = s[6];
            }
            else
//non-connected udp ports have no 'state' thus they have only 6 values
            {
            insns.Parameters["@Protocol"].Value = s[0];
            insns.Parameters["@LocalHost"].Value = s[1];
            insns.Parameters["@LocalPort"].Value = s[2];
            insns.Parameters["@RemoteHost"].Value = s[3];
            insns.Parameters["@RemotePort"].Value = s[4];
            insns.Parameters["@State"].Value = "0";
            insns.Parameters["@PID"].Value = s[5];
            }
//check for the end of the output
        if (Line == null)
        break;
        }
//clear up
    Ns.Close();
    Ns.Dispose();

however, for no obvious reason, sometimes after only a few minutes of running or sometimes after many hours I get an exception:
System.IndexOutOfRangeException: Index was outside the bounds of the array.

Can I track which index this is and 'On Error Resume Next' around it? How can I negate this error or dispose of it and continue?

It doesn't matter too much if in one cycle I only get 71 instead of 72 connections dispalayed as, 1 minute later. I collect them all again anyway.

The problem it causes is that the netstat does quit and stays running in the Task Manager which means that all subsequent netstats start piling up behind it and, although the data gets written to the db, I can end up with dozens of netstats in my Task Manager which then have to be End-Tasked.

I am fairly sure that this is because the netstat never gets to .Close & .Dispose thus never receives an Exit signal so the .WaitForExit stays waiting. I am right in this assumption? How can I send it an Exit signal after the exception is called?

Any ideas please?

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Eddy Vluggen4-Apr-12 11:20

Eddy Vluggen

4-Apr-12 11:20

CCodeNewbie wrote:
I am fairly sure that this is because the netstat never gets to .Close & .Dispose thus never receives an Exit signal so the .WaitForExit stays waiting. I am right in this assumption?

I wouldn't pick it as the first suspect for an "index out of range" message.

CCodeNewbie wrote:
Can I track which index this is

Did the exception come with a stack-trace? What is the content of "Exception.ToString()"?

CCodeNewbie wrote:
'On Error Resume Next' around it?

Let's ignore that you mentioned this.

 string[] s = Line.Split(' ')
//tcp protocol has 7 values, udp connections to external IP address have 7 values
        if (s.Length == 7)
            {
//insns is a sqlcommand - this works faultlessly every time 
            insns.Parameters["@Protocol"].Value = s[0];
            insns.Parameters["@LocalHost"].Value = s[1];
            insns.Parameters["@LocalPort"].Value = s[2];
            insns.Parameters["@RemoteHost"].Value = s[3];
            insns.Parameters["@RemotePort"].Value = s[4];
            insns.Parameters["@State"].Value = s[5];
            insns.Parameters["@PID"].Value = s[6];
            }
            elseif (s.Length == 6)
//non-connected udp ports have no 'state' thus they have only 6 values
            {
            insns.Parameters["@Protocol"].Value = s[0];
            insns.Parameters["@LocalHost"].Value = s[1];
            insns.Parameters["@LocalPort"].Value = s[2];
            insns.Parameters["@RemoteHost"].Value = s[3];
            insns.Parameters["@RemotePort"].Value = s[4];
            insns.Parameters["@State"].Value = "0";
            insns.Parameters["@PID"].Value = s[5];
            }
            else
            {
              throw new Exception("This is where it probably goes boom");
            }

Bastard Programmer from Hell Suspicious | :suss:

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie4-Apr-12 11:37

CCodeNewbie

4-Apr-12 11:37

Quote:
I wouldn't pick it as the first suspect for an "index out of range" message.

I meant could that be the reason I get a traffic jam of netstats in the Task Manager

Quote:
Did the exception come with a stack-trace? What is the content of "Exception.ToString()"?

I have coded in a .InnerException to try and get the trace. The existing error only gives "System.IndexOutOfRangeException: Index was outside the bounds of the array."

Quote:
Let's ignore that you mentioned this.

Hee Hee Hee Laugh | :laugh:

I have rebuilt and have to wait to see what exceptions may arise. Will advise asap.

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie7-Apr-12 13:41

CCodeNewbie

7-Apr-12 13:41

Hi Eddy,

Sorry I haven't got back to you sooner. Did what you suggested but now it makes even less sense:

throw new Exception("failed " + s.Length + " : " + s + " : " + Line);

results in
failed 6 : System.String[] : UDP 0.0.0.0 445 * * 4

pardon my ignorance but why is it ignoring the

if (s.Length == 6)

instruction?

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Eddy Vluggen7-Apr-12 22:21

Eddy Vluggen

7-Apr-12 22:21

CCodeNewbie wrote:

pardon my ignorance but why is it ignoring the
C#
if (s.Length == 6)
instruction?

It shouldn't, if the string can be divided into six different words. The line that has been logged, would be broken down like this;

UDP
0.0.0.0
445
*
*
4

You can verify the result using the code below;

foreach (string someWord in s)
{
  System.Diagnostics.Debugger.WriteLine("'{0}'", someWord);
}

Also, can you post your (updated) code again?

Bastard Programmer from Hell Suspicious | :suss:

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie8-Apr-12 0:14

CCodeNewbie

8-Apr-12 0:14

Hi Eddy,

Usually it does divide. "UDP 0.0.0.0:445 *:* 4" put through

if (s.Length == 6)
    {
        insns.Parameters["@Protocol"].Value = s[0];
        insns.Parameters["@LocalHost"].Value = s[1];
        insns.Parameters["@LocalPort"].Value = s[2];
        insns.Parameters["@RemoteHost"].Value = s[3];
        insns.Parameters["@RemotePort"].Value = s[4];
        insns.Parameters["@State"].Value = "0";
        insns.Parameters["@PID"].Value = s[5];
    }

becomes
s[0]=UDP
s[1]=0.0.0.0
s[2]=445
s[3]=*
s[4]=*
s[5]=0
s[6]=4

if I remove the line "insns.Parameters["@State"].Value = "0";"
the output reports "Listening" even though there is no value in the netstat cmd-line output.

Sorry this is taking a while, worked out I had to use System.Diagnostics.Debug.WriteLine instead of System.Diagnostics.Debugger.WriteLine

So, I did

Process Ns = new Process();
ProcessStartInfo startInfo = new ProcessStartInfo("netstat");
startInfo.Arguments = "-ano";
startInfo.UseShellExecute = false;
startInfo.RedirectStandardOutput = true;
startInfo.CreateNoWindow = true;
Ns.StartInfo = startInfo;
Ns.Start();
Ns.WaitForExit();
for (int i = 0; i < 4; i++)
    Ns.StandardOutput.ReadLine();
while (true)
{
    Line = (Ns.StandardOutput.ReadLine());
    if (!string.IsNullOrEmpty(Line))
    {
        Line = Line.Trim();
        Line = Line.Replace("        ", " ");
        Line = Line.Replace("       ", " ");
        Line = Line.Replace("      ", " ");
        Line = Line.Replace("     ", " ");
        Line = Line.Replace("    ", " ");
        Line = Line.Replace("   ", " ");
        Line = Line.Replace("  ", " ");
        Line = Line.Replace("  ", " ");
        Line = Line.Replace("  ", " ");
        Line = Line.Replace(":", " ");
        Line = Line.Replace('\r', ' ');
        Line = Line.Replace('\n', ' ');
        s = Line.Split(' ');
        if (s[0] == "TCP")
        {
            if (s[1] != "0.0.0.0")
            {
                insns.Parameters["@Tstamp"].Value = DateTime.Now;
                insns.Parameters["@SysID"].Value = SID;
                insns.Parameters["@Protocol"].Value = s[0];
                insns.Parameters["@LocalHost"].Value = s[1];
                insns.Parameters["@LocalPort"].Value = s[2];
                insns.Parameters["@RemoteHost"].Value = s[3];
                insns.Parameters["@RemotePort"].Value = s[4];
                insns.Parameters["@State"].Value = s[5];
                insns.Parameters["@PID"].Value = s[6];
                NSInfo.Open();
                insns.ExecuteNonQuery();
                NSInfo.Close();
            }
       }
       if (s[0] == "UDP")
       {
            if (s.Length == 6)
            {
                insns.Parameters["@Tstamp"].Value = DateTime.Now;
                insns.Parameters["@SysID"].Value = SID;
                insns.Parameters["@Protocol"].Value = s[0];
                insns.Parameters["@LocalHost"].Value = s[1];
                insns.Parameters["@LocalPort"].Value = s[2];
                insns.Parameters["@RemoteHost"].Value = s[3];
                insns.Parameters["@RemotePort"].Value = s[4];
                insns.Parameters["@State"].Value = "0";
                insns.Parameters["@PID"].Value = s[5];

            NSInfo.Open();
            insns.ExecuteNonQuery();
            NSInfo.Close();
            }
            if (s.Length == 7)
            {
                insns.Parameters["@Tstamp"].Value = DateTime.Now;
                insns.Parameters["@SysID"].Value = SID;
                insns.Parameters["@Protocol"].Value = s[0];
                insns.Parameters["@LocalHost"].Value = s[1];
                insns.Parameters["@LocalPort"].Value = s[2];
                insns.Parameters["@RemoteHost"].Value = s[3];
                insns.Parameters["@RemotePort"].Value = s[4];
                insns.Parameters["@State"].Value = s[5];
                insns.Parameters["@PID"].Value = s[6];
            NSInfo.Open();
            insns.ExecuteNonQuery();
            NSInfo.Close();
            }
            else
            {
                foreach (string someWord in s)
                    {
                        System.Diagnostics.Debug.WriteLine("'{0}'", someWord);
                    }
            }
        }

when the timer triggered my CPU ramped up to 99% usage by my app and I had to End-Task it. Nothing was written to the Output or the Event log.

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Eddy Vluggen8-Apr-12 0:28

Eddy Vluggen

8-Apr-12 0:28

CCodeNewbie wrote:
becomes

s[0]=UDP
s[1]=0.0.0.0
s[2]=445
s[3]=*
s[4]=*
s[5]=0
s[6]=4

That's strange; if s[] contains six elements, how did we get seven items here? s[5] should be 4 IMHO, and s[6] shouldn't be there.

CCodeNewbie wrote:
worked out I had to use System.Diagnostics.Debug.WriteLine instead of System.Diagnostics.Debugger.WriteLine

Aw, my apologies; I tend to mix them up outside of the IDE. It should list all the words in the array in the output-window of Visual Studio.

CCodeNewbie wrote:
when the timer triggered my CPU ramped up to 99% usage by my app and I had to End-Task it. Nothing was written to the Output or the Event log.

Could it be that it's reading a lot of empty lines?

while (true)
{
    Line = (Ns.StandardOutput.ReadLine());
    if (!string.IsNullOrEmpty(Line))

Bastard Programmer from Hell Suspicious | :suss:

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie8-Apr-12 1:12

CCodeNewbie

8-Apr-12 1:12

from a cmd-line netstat -ano you can see that the field usually used by "State" tends to be empty under the UDP protocol unless there is some stream coming in in which case it will show "Established" or whatever. Because I am writing the values to a SQL table I need to keep s[6] in the PID column.

Quote:
Could it be that it's reading a lot of empty lines?

don't think so, usually it works fine until it hits a null/empty value somewhere in the s[] array. What would be ideal is a way of saying:
if (s[whatever].isNullorEmpty){s[whatever] = "0";}

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Eddy Vluggen8-Apr-12 1:48

Eddy Vluggen

8-Apr-12 1:48

Select the menu "Debug" and then "Toggle Breakpoint", and use F10 to step through your code.

CCodeNewbie wrote:
What would be ideal is a way of saying:

Something like this?

string FetchFromArray(string[] source, int idx)
{
    if (idx <= source.Length)
        return source[idx];
    else
        return String.Empty;
}
public Form1()
{
    InitializeComponent();
    string[] s = "Hello world from Mars!".Split(' ');
    Text = FetchFromArray(s, 7);
}

Bastard Programmer from Hell Suspicious | :suss:

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie8-Apr-12 2:09

CCodeNewbie

8-Apr-12 2:09

Trying to work out why mu CPU is going mad at the moment, I'll get back to this in a bit..

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie8-Apr-12 8:21

CCodeNewbie

8-Apr-12 8:21

Sorted out the CPU thing, and so far haven't had any exceptions (after about an hour of testing).

So far so good although I do need to ass a couple of modules back into the service.

Now for my next problem...http://www.codeproject.com/Messages/4214946/Re-Getting-values-from-tasklist-exe-v-update.aspx[^]

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Eddy Vluggen8-Apr-12 8:29

Eddy Vluggen

8-Apr-12 8:29

Nice

I was kind of busy with a very tasty rabbit Big Grin | :-D

Bastard Programmer from Hell Suspicious | :suss:

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie8-Apr-12 8:33

CCodeNewbie

8-Apr-12 8:33

Had a leg of lamb myself, roast potatoes, roast butternut, sweetish-sharp gravy... All good...

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Eddy Vluggen8-Apr-12 8:56

Eddy Vluggen

8-Apr-12 8:56

CCodeNewbie wrote:
Had a leg of lamb myself, roast potatoes, roast butternut, sweetish-sharp gravy... All good...

Sounds like an equal festive meal - today, life's good Big Grin | :-D

Bastard Programmer from Hell Suspicious | :suss:

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie8-Apr-12 8:58

CCodeNewbie

8-Apr-12 8:58

tell it like it is fellow gastronaut... and thanks for looking in on the other thing that's making me tear my hair out...

Why do so may seemingly simple things have to be so complicated...

Re: IndexOutOfRangeExceoption while parsing a Netstat process - update

CCodeNewbie8-Apr-12 0:30

CCodeNewbie

8-Apr-12 0:30

tried

if (s.Length == 6)
    {
        insns.Parameters["@Tstamp"].Value = DateTime.Now;
        insns.Parameters["@SysID"].Value = SID;
        insns.Parameters["@Protocol"].Value = s[0];
        insns.Parameters["@LocalHost"].Value = s[1];
        insns.Parameters["@LocalPort"].Value = s[2];
        insns.Parameters["@RemoteHost"].Value = s[3];
        insns.Parameters["@RemotePort"].Value = s[4];
        insns.Parameters["@State"].Value = string.Empty;
        insns.Parameters["@PID"].Value = s[5];
        NSInfo.Open();
        insns.ExecuteNonQuery();
        NSInfo.Close()
    };

same thing - service starts, netstat launches, CPU 99%

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Luc Pattyn4-Apr-12 11:38

Luc Pattyn

4-Apr-12 11:38

CCodeNewbie wrote:
if (Line == null) break;

Line can't be null at that point

2.
Do as Eddy said, check for the presence of 6 parts if you're consuming 6 parts. Never trust input, sooner or later it will not be what you expected, so cope with that.

3.
Keep a copy of the original input line, and display it in the exception thrown by the code Eddy added.
And/or log all the lines you are getting from netstat.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: IndexOutOfRangeExceoption while parsing a Netstat process

CCodeNewbie4-Apr-12 11:41

CCodeNewbie

4-Apr-12 11:41

Have added in a new exception to display s.length.
Would you rather recommend

if(Line.length = 0)?

Re: IndexOutOfRangeExceoption while parsing a Netstat process

Luc Pattyn4-Apr-12 11:57

Luc Pattyn

4-Apr-12 11:57

you already have an emptyOrNull test at the start, use that to exit the loop.

and I tend to display the original inputs when things go wrong, and optionally also derived values.
chances are NetStat occasionally emits a line you never expected!

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

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