C# Discussion Boards - CodeProject

Saksida Bojan11-Dec-09 7:55

11-Dec-09 7:55

Hello

I would like to know difference betwen casting and if there is one, then in which conditions shroud be used

Example:

TextBox txt = new TextBox;
Object obj = txt;

// What is the difference between these 2 castings
TextBox txt1 = (TextBox) txt;
TextBox txt2 = txt as TextBox;

This may be stupid question but thanks in advance

Re: Info about casting

Andrew Rissing11-Dec-09 8:00

Andrew Rissing

11-Dec-09 8:00

Check this out: http://www.c-sharpcorner.com/UploadFile/pcurnow/polymorphcasting06222007131659PM/polymorphcasting.aspx[^]

Re: Info about casting

Andrew Rissing11-Dec-09 8:03

Andrew Rissing

11-Dec-09 8:03

And in general, I prefer using 'as', but it depends on your situation. If you want an exception to be thrown, use explicit casting (ex. "((TextBox)obj)"). Generally, its good to avoid exceptions unless there's just nothing you can do to avoid the 'exceptional' behavior.

Re: Info about casting

Saksida Bojan11-Dec-09 8:43

Saksida Bojan

11-Dec-09 8:43

Thanks to both replies. Those answer extinguish my curiosty

Re: Info about casting

harold aptroot11-Dec-09 9:03

harold aptroot

11-Dec-09 9:03

Also, the C-style cast can be overloaded, but as can not be overloaded.

How do I attach event handlers to a late-bound object (C#)?

Hawks Talon11-Dec-09 6:52

Hawks Talon

11-Dec-09 6:52

I've created a control to embed a MSWord document based on several projects here. The embeding it's self works great but I am having trouble figuring out how to bind event handlers. See below for an example.

Word.DocumentBeforeClose += new ApplicationEvents4_DocumentBeforeCloseEventHandler(OnClose);

The above line works with doing early binding, but due to the variations in version of Office being used in the company, I need to do late binding. Anyone got any ideas?

Thank you,
Eric Ritzie

Re: How do I attach event handlers to a late-bound object (C#)?

Saksida Bojan11-Dec-09 7:03

Saksida Bojan

11-Dec-09 7:03

I Don't think you can do it that way. There are 2 options that I thought:

1. Option:
Install same version of Office

2. Option:
Use different module (dll) based on Office installed

3. Option: (I Don't know how to do it in C#
Use compiler directive and compile different exe files

Re: How do I attach event handlers to a late-bound object (C#)?

Hawks Talon11-Dec-09 7:35

Hawks Talon

11-Dec-09 7:35

Hmmm.....Option 1 is not really feesable because of cost. Options 2 and 3 would be a big pain although they are doable.

I think there has to be a way to do what I am trying to accompish biw the Interop. I'm able to get and set properties by using type.InvokeMember() and I can even get an event object by using type.GetEvent(), I just need that last little bit to bind it to my event handlers.

Thank you,
Eric Ritzie

WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon11-Dec-09 5:52

Jacob Dixon

11-Dec-09 5:52

I am at a lost. I have verified what I am doing against the documentation on microsofts website:
http://msdn.microsoft.com/en-us/library/aa392154(VS.85).aspx[^] and I just can't figure out why it would give me this error.

My Connection object is not shown as it is global within the class I have it in. I am connect to this machine that is not on the domain and get installed applications, all services, and computer information. The problem is it keeps throwing a "Invalid Method Parameter(s)" error.

In case your wondering.. I ran a foreach look on the inParams.Properties and verified that all the method parameters existed in the inParams (which it does).

Any help would be great!

public string Join(string dns, string domain, string username, string password)
        {
            try
            {
                ManagementScope scope = new ManagementScope(@"\\" + dns + @"\root\CIMV2", conn);
                ManagementPath path = new ManagementPath("Win32_ComputerSystem");
                ManagementClass mgmtClass = new ManagementClass(scope, path, null);
                ManagementBaseObject inParams = mgmtClass.GetMethodParameters("JoinDomainOrWorkgroup");

                inParams["Name"]            = domain;
                inParams["UserName"]        = username;
                inParams["Password"]        = password;
                inParams["AccountOU"]       = null;
                inParams["FJoinOptions"]    = (UInt32)1;

                ManagementBaseObject outParams = mgmtClass.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);
                string status = ReturnedValue.JoinDomainOrWorkgroup(Convert.ToInt32(outParams["ReturnValue"]));

                return status;
            }
            catch (Exception ex)
            {
                EventLog.WriteEntry("ADEM Application", ex.Message, EventLogEntryType.Error);
                return ex.Message;
            }
        }

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Luc Pattyn11-Dec-09 6:04

Luc Pattyn

11-Dec-09 6:04

Hi Jacob,

I'm not familiar with the specifics of your query, however I strongly advice everyone to always look at Exception.ToString() as it often contains much more than a Message and a TraceBack; there may be additional information, and one or more inner exceptions.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon11-Dec-09 6:14

Jacob Dixon

11-Dec-09 6:14

Good idea.. but I didn't really find anything worth while that I can see. I even set break points and can't seem to find out why it is doing this.. WMI is a pain sometimes

System.Management.ManagementException: Invalid method Parameter(s) 
   at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
   at System.Management.ManagementObject.InvokeMethod(String methodName, ManagementBaseObject inParameters, InvokeMethodOptions options)
   at WMI.WMI_Commands.Join(String dns, String domain, String username, String password) in C:\Users\jdixon\Documents\Visual Studio 2008\Projects\DLL\WMI\frmWMI.cs:line 92

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Saksida Bojan11-Dec-09 6:52

Saksida Bojan

11-Dec-09 6:52

As you have posted that link, I presume you are using PInvoke of JoinDomainOrWorkgroup

I saw that it expects to pass 5 parameters (According to MSDN) and you are using only one

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon11-Dec-09 8:31

Jacob Dixon

11-Dec-09 8:31

I am passing 4 parameters:

inParams["Name"]            = domain;
inParams["UserName"]        = username;
inParams["Password"]        = password;
inParams["AccountOU"]       = null;
inParams["FJoinOptions"]    = (UInt32)1;

I am actually specifying 5 but the AccountOU one is optional. This is using WMI

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Saksida Bojan11-Dec-09 8:37

Saksida Bojan

11-Dec-09 8:37

Your Code:

ManagementBaseObject outParams = mgmtClass.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);
                string status = ReturnedValue.JoinDomainOrWorkgroup(Convert.ToInt32(outParams["ReturnValue"]));

At witch line it does fail?

Also how do you use define how do you use that delegate?

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon11-Dec-09 9:10

Jacob Dixon

11-Dec-09 9:10

Fails:

ManagementBaseObject outParams = mgmtClass.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Saksida Bojan11-Dec-09 11:50

Saksida Bojan

11-Dec-09 11:50

try
{
     ManagementObject classInstance = 
          new ManagementObject("root\\CIMV2", 
          "Win32_ComputerSystem.Name='BSAKSIDA-PC'",
          null);

     // Obtain in-parameters for the method
     ManagementBaseObject inParams = 
     classInstance.GetMethodParameters("JoinDomainOrWorkgroup");

     // Add the input parameters.
     inParams["AccountOU"] = " OU=testOU, DC=domain, DC=Domain, DC=com";
     inParams["Name"] =  "WORKGROUP";
     inParams["Password"] =  null;
     inParams["Username"] =  "everyone";

     // Execute the method and obtain the return values.
     ManagementBaseObject outParams = 
          classInstance.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);

     // List outParams
     Console.WriteLine("Out parameters:");
     Console.WriteLine("ReturnValue: " + outParams["ReturnValue"]);
}
catch(ManagementException err)
{
     MessageBox.Show("An error occurred while trying to execute the WMI method: " + err.Message);
}

I Used this example to get it working on mine side. I do not know how to do it in your case, because i only have Workgroup not domain

WMI Code Creator[^]

I Used that tool (Can run C# code as script) to create that WMI call. I do not know why it fail, bat play with that tool.
Tip: Look at »Execute a Method«, under menu select apropriate target. Method [in] Parameters are buggy, so write manualy inside generated code on left. You can directly execute the code without Visual Studio

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon11-Dec-09 16:09

Jacob Dixon

11-Dec-09 16:09

I am using the WMI Code Creator also.
I modified what you supplied a little and still have no luck.

try
            {
                ManagementObject classInstance = new ManagementObject("\\WIN-HSPKIXZR3HK\\root\\CIMV2", "Win32_ComputerSystem", null);
                // Obtain in-parameters for the method     
                ManagementBaseObject inParams = classInstance.GetMethodParameters("JoinDomainOrWorkgroup");
                // Add the input parameters.     
                inParams["AccountOU"] = " OU=Computers, DC=adem, DC=arkansas, DC=gov";
                inParams["Name"] = "WORKGROUP";
                inParams["Password"] =  null;
                inParams["Username"] = "everyone";
                // Execute the method and obtain the return values.     
                ManagementBaseObject outParams = classInstance.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);
                // List outParams  
                Console.WriteLine(outParams["ReturnValue"]);
            }
            catch (ManagementException err)
            {
                Console.WriteLine(err.ToString());
            }
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}

ERROR:
Microsoft (R) Visual C# 2005 Compiler version 8.00.50727.4927
for Microsoft (R) Windows (R) 2005 Framework version 2.0.50727
Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.

System.ArgumentOutOfRangeException: Specified argument was out of the range of v
alid values.
Parameter name: path
   at System.Management.ManagementObject.ManagementObjectCTOR(ManagementScope sc
ope, ManagementPath path, ObjectGetOptions options)
   at System.Management.ManagementObject..ctor(String scopeString, String pathSt
ring, ObjectGetOptions options)
   at WMISample.CallWMIMethod.Main()

C:\Windows\Microsoft.NET\Framework\v2.0.50727>

I also tried this way which is more like what you supplied:

 try
            {
                ManagementObject classInstance = new ManagementObject("\\root\\CIMV2", "Win32_ComputerSystem.Name='WIN-HSPKIXZR3HK'", null);
                // Obtain in-parameters for the method     
                ManagementBaseObject inParams = classInstance.GetMethodParameters("JoinDomainOrWorkgroup");
                // Add the input parameters.     
                inParams["AccountOU"] = " OU=Computers, DC=adem, DC=arkansas, DC=gov";
                inParams["Name"] = "WORKGROUP";
                inParams["Password"] =  null;
                inParams["Username"] = "everyone";
                // Execute the method and obtain the return values.     
                ManagementBaseObject outParams = classInstance.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);
                // List outParams  
                Console.WriteLine(outParams["ReturnValue"]);
            }
            catch (ManagementException err)
            {
                Console.WriteLine(err.ToString());
            }
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}

With ERROR:
Microsoft (R) Visual C# 2005 Compiler version 8.00.50727.4927
for Microsoft (R) Windows (R) 2005 Framework version 2.0.50727
Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.

System.Management.ManagementException: Not found
   at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStat
us errorCode)
   at System.Management.ManagementObject.Initialize(Boolean getObject)
   at System.Management.ManagementBaseObject.get_wbemObject()
   at System.Management.ManagementObject.get_ClassPath()
   at System.Management.ManagementObject.GetMethodParameters(String methodName,
ManagementBaseObject& inParameters, IWbemClassObjectFreeThreaded& inParametersCl
ass, IWbemClassObjectFreeThreaded& outParametersClass)
   at System.Management.ManagementObject.GetMethodParameters(String methodName)
   at WMISample.CallWMIMethod.Main()

C:\Windows\Microsoft.NET\Framework\v2.0.50727>

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Saksida Bojan11-Dec-09 19:48

Saksida Bojan

11-Dec-09 19:48

I Have tried both example. I do not know why it fails, but the second fails because WIN-HSPKIXZR3HK is incorectly. The example I provided connects to LocalHost (Same Computer). It is very hard to help if you want to connect to Domain, because I can not test it. (Probably i wolould Need dedicated machine with Windows 2003 server or 2008 server). Have you tried to put IP for destenation computer?

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon12-Dec-09 3:44

Jacob Dixon

12-Dec-09 3:44

I understand. I think it is something wrong with the code provided by microsoft. I have googled this with no luck of anyone doing it with a remote computer. Technically it should work. Using code like I have provided, I am able to install software, uninstall software, get list of services, get list of disk drives with amount of space, free space, etc... and even model and vendor information about the computer.

The fact that the error it gives me is "Invalid Method Parameters" tells me that the code on MSDN is fishy. It doesn't say it can't work for a remote computer...

I don't know..

Let me ask you this, do you know if there is any way to accomplish this with PInvoke? I know there is this: http://www.pinvoke.net/default.aspx/netapi32/NetJoinDomain.html[^] but that seems only able to join the local computer to the domain. Not a remote computer

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon12-Dec-09 3:55

Jacob Dixon

12-Dec-09 3:55

You know I think I can make NetJoinDomain work. I can write a console application that takes the arguments as the information used to join the local computer... but what I can do is copy the console application to the computer, execute that console application from a remote computer using Win32_Process and then reboot it if it was successful

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Saksida Bojan12-Dec-09 4:11

Saksida Bojan

12-Dec-09 4:11

That could be done. I suggest to try to go to Microsoft forums for more info about this problem.

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Jacob Dixon14-Dec-09 6:20

Jacob Dixon

14-Dec-09 6:20

I have posted.. just FYI I have even tried the Reboot under Win32_OperatingSystem. It gives me a "Invalid Method Parameters" as well.. funny thing is this doesn't take any parameters! Lokos like part of WMI is crap

Re: WMI 'Invalid Method Parameter(s)' JoinDomainOrWorkGroup

Saksida Bojan14-Dec-09 6:23

Saksida Bojan

14-Dec-09 6:23

For myself I do not use WMI. My programming is Hobby. Please let me know if you will get positive answer.

One way to solve it is to create specific process (Possibly Service) and it acs as server, where it is capable to execute your commands or even scripts

connctionstring

farokhian11-Dec-09 3:28

farokhian

11-Dec-09 3:28

Hi Please somebody help me.
I need a connectionstring for c#windows application that connect to my database(my database near exe files in bin)without attach my database in microsoft sql 2005.

Re: connctionstring

PIEBALDconsult11-Dec-09 3:38

PIEBALDconsult

11-Dec-09 3:38

An SQL Server database must be attached to an SQL Server in order to access it.

There are databases don't rely on a server, you could try one of those, but I don't recommend it.

Why don't you want to attach it? You could attach it only for the duration of your application.

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