C# Discussion Boards - CodeProject

musefan1-Dec-10 2:55

musefan

1-Dec-10 2:55

No problems also be aware that there an Interface is similar to a abstract class in what it may be used for. I don't know your exact requirements but if you don't know about Interfaces then you might want to check them out.

Here is a comparison between Abstract classes and Interfaces which may identify if you could make use of an Interface instead...

Abstract Class versus Interface[^]

Life goes very fast. Tomorrow, today is already yesterday.

Keith Barrow1-Dec-10 1:18

Keith Barrow

1-Dec-10 1:18

I'm just doing the schoolboy error check, so don't take this amiss, are you sure you haven't really got:

AbsMyObject.MyMethod();

I.E. The method really belongs in the AbsMyObject class rather than the caller?

Also I tried this (to make sure I wasn't about to make a schoolboy error Smile | :)

) and it works without the cast:

public abstract class Foo { }
public class Bar : Foo { }
public class Baz : Foo { }
public class Qux : Baz { }
public class Quux : Foo { }

class Program
{
    static void MyMethod(string id, Foo arg) { Console.WriteLine("{0} Called Object Type {1}", id, arg.GetType()); }
    static void MyMethod(Foo arg) { MyMethod("Foo", arg); }
    static void MyMethod(Bar arg) { MyMethod("Bar", arg); }
    static void MyMethod(Baz arg) { MyMethod("Baz", arg); }

    static void Main(string[] args)
    {
        MyMethod(new Bar());
        MyMethod(new Baz());
        MyMethod(new Qux());
        MyMethod(new Quux());
        Console.ReadLine();
    }
}

Sorry if I misunderstood your problem, but you are right, such if statements have a bad code smell. [Edit]: If those two options don't apply, Pete's suggestion is good. Can MyMethod be refactored to accept the base class and handle the class based differences inside it?

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-A Dead ringer for Kate Winslett[^]

musefan1-Dec-10 1:24

musefan

1-Dec-10 1:24

I think his issue is that he has an object type and therefore doesn't know the actual type of the object and cannot just call the method. For example...

MyMethod(new object());//this would not work but effectively is what he has

Life goes very fast. Tomorrow, today is already yesterday.

Keith Barrow1-Dec-10 1:52

Keith Barrow

1-Dec-10 1:52

I think more complete code from the OP might help. I'm not sure I understand his question in that, I understand the problem that he needs to determine the type for a method call, but I don't know why he doesn't know it in the first place. I read the OP as all the types coming from some abtract base object.

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-A Dead ringer for Kate Winslett[^]

PIEBALDconsult1-Dec-10 2:26

PIEBALDconsult

1-Dec-10 2:26

musefan wrote:
doesn't know the actual type of the object

The runtime will.

Pete O'Hanlon1-Dec-10 2:57

1-Dec-10 2:57

This would argue that he either needs an interface, or he needs to use generics instead. Basically, what he has here is a form of class factory, and there are lots of neat implementations that can be used.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Call XP Mode shortcut programmatically [modified]

PIEBALDconsult1-Dec-10 2:28

PIEBALDconsult

1-Dec-10 2:28

I don't think that's necessary; did you try it without the casting?

But if you do need it, take a look here[^].

spif200130-Nov-10 20:36

spif2001

30-Nov-10 20:36

Hi
I'm trying to call a XP Mode shortcut programmatically, but I keep getting the same error message:

"problem starting C:\windows\system32\VMCPropertyHandler.dll The specified module could not be found"

I tried with the following:

string startPath = @"C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup";<br />
Process p = new Process();<br />
p.StartInfo.FileName = startPath + "\\XPModeInitializer (Windows XP Mode).lnk";<br />
p.StartInfo.UseShellExecute = true;<br />
p.Start();

But I have also done many variants. I even tried making a bat file, that just call the link. The bat file itself works when double-clicked, but when called from within my code like the following snippet, I get the same error message:

Process p = new Process();<br />
p.StartInfo.FileName = Environment.CurrentDirectory + "\\CallXPModeInitializer.bat";<br />
p.StartInfo.UseShellExecute = true;<br />
p.Start();

I also tried taking the shortcut parameters and using them myself like this:

string file = System.Environment.SystemDirectory + @"\rundll32.exe";<br />
string arguments = System.Environment.SystemDirectory + @"\VMCPropertyHandler.dll,LaunchVMSal ""Windows XP Mode"" ""||a9c104ed"" ""XPModeInitializer""";<br />
Process p = new Process();<br />
p.StartInfo.FileName = file;<br />
p.StartInfo.Arguments = arguments;<br />
p.StartInfo.UseShellExecute = true;<br />
p.Start();

But it produces the same error message,
I'm confused at to why a direct use of the bat file works, when the call to the bat file from within C# fails!?

How can I call a XP Mode shortcut from within C# code?

I'm in the high-fidelity first class traveling set.
And I think I need a Lear jet.

modified on Wednesday, December 1, 2010 4:35 AM

Rajesh Anuhya30-Nov-10 22:27

Rajesh Anuhya

30-Nov-10 22:27

System.Environment.SystemDirectory

it self return the "c:\windows\system32\"

why are you aging adding the "system32" in your code ...

System.Environment.SystemDirectory + @"\system32\VMCPropertyHandler.dll,LaunchVMSal ""Windows XP Mode"" ""||a9c104ed"" ""XPModeInitializer""";

Rajesh B --> A Simple Programmer <--

spif200130-Nov-10 22:35

spif2001

30-Nov-10 22:35

Bad copy paste. Smile | :)

Fixed...

Fixing the System32 part does not make any difference though. It still fails.

I'm in the high-fidelity first class traveling set.
And I think I need a Lear jet.

Eddy Vluggen1-Dec-10 1:23

Eddy Vluggen

1-Dec-10 1:23

spif2001 wrote:
I'm confused at to why a direct use of the bat file works, when the call to the bat file from within C# fails!?

You could try setting the WorkingDirectory[^];

If the property is not set, the default working directory is %SYSTEMROOT%\system32.

I are Troll Suspicious | :suss:

spif20011-Dec-10 1:52

spif2001

1-Dec-10 1:52

Sorry sorry sorry... stupid me...

I didn't notice my projects in Visual Studio was set to x86. Setting them to Any CPU solved my problems.

I guess when run as x86, the System32 part of the path gets redirected to the SysWOW64 folder. In which of course the desired files are not placed.

I'm in the high-fidelity first class traveling set.
And I think I need a Lear jet.

Multiple query results on one form.

Eddy Vluggen1-Dec-10 2:32

Eddy Vluggen

1-Dec-10 2:32

spif2001 wrote:
I didn't notice my projects in Visual Studio was set to x86. Setting them to Any CPU solved my problems

I would have overlooked that too Smile | :)

I are Troll Suspicious | :suss:

Joe Stansfield30-Nov-10 18:36

Joe Stansfield

30-Nov-10 18:36

Hey all,

I am not sure whether this is possible and if I am approaching it the wrong way but...

What I'd like to do is have a form that allows 3 separate records from a database to be shown in text boxes similar to:

Record 1 Size Record 1 Rate | Record 2 Size Record 2 Rate | Record 3 Size Record 3 Rate |
Record 1 Total | Record 2 Total | Record 3 Total |

Could someone please push me in the right direction for achieving this? I have a query that returns either 1,2 or 3 records but can currently only get my form to display the same record in all 3 sets of text boxes.

Any help would be appreciated!

Joe

Re: Multiple query results on one form.

Pete O'Hanlon30-Nov-10 22:23

30-Nov-10 22:23

Without seeing any of your code, it's hard to advise you on how best to do this. Are you binding textboxes directly? Are you programatically binding them? How are you retrieving the data - is it via DataSet or DataReader?

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Re: Multiple query results on one form.

Joe Stansfield1-Dec-10 11:29

Joe Stansfield

1-Dec-10 11:29

Thanks for the reply Pete,

I am fairly new to this whole thing - but am slowly getting my head around it.

I'm retrieving the data via DataSet, with the text boxes bound to the dataset(however I have not bound them myself, just dragged and dropped in the designer).

Currently the query I have is a simple designer one with 2 parameters for if ID = @ID1 or if ID = @ID2.

Joe

in microsoft report viewer i want change datasource in run time

Nabawoka30-Nov-10 10:18

Re: in microsoft report viewer i want change datasource in run time

30-Nov-10 10:18

i add data set &
add 4 table in this data set and design 4 reports for each table
i want to choose the report & set datasource to report and show in microsoft report view
i try this code but failed

ReportOfEng.LocalReport.ReportEmbeddedResource = "follow_up.Report1.rdlc";
     ReportDataSource ds = new ReportDataSource();
     ds.Name = dataSet11.Movements.TableName;
     ds.Value = dataSet11.Movements;
     ReportOfEng.LocalReport.DataSources.Clear();
     ReportOfEng.LocalReport.DataSources.Add(ds);
     this.movementsTableAdapter1.Fill(dataSet11.Movements);
     this.ReportOfEng.RefreshReport();

then in runtime when i btnclick
this message appear in report
"data source instance has not been supplied for dataset"

so what i can do Big Grin | :-D

Pete O'Hanlon30-Nov-10 11:32

30-Nov-10 11:32

Well, LocalReport.DataSources has been cleared, and yet you haven't done a LocalReport.DataSources.Add.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Re: in microsoft report viewer i want change datasource in run time

Nabawoka30-Nov-10 19:24

30-Nov-10 19:24

i add the datasource in program but i forget to add in this block code Wink | ;)

so the error appear in the report
so again what can i do Big Grin | :-D

I Get it :D:D ;)

Nabawoka30-Nov-10 22:12

30-Nov-10 22:12

depend on RadioButton Check Big Grin | :-D

if (rdbEng.Checked==true)
{
    ReportsOfRun.Reset();
    ReportsOfRun.LocalReport.ReportEmbeddedResource = "follow_up.Report_Eng.rdlc";
    ds.Name = "DataSetReport_Eng_Table";
    ds.Value = Eng_TableBindingSource;
    //ReportsOfRun.LocalReport.DataSources.Clear();
    ReportsOfRun.LocalReport.DataSources.Add(ds);
    ReportsOfRun.DocumentMapCollapsed = true;
    this.Eng_TableTableAdapter.Fill(this.DataSetReport.Eng_Table,int.Parse(txtEngCode.Text));
}
else if (rdbMonth.Checked==true)
{
    ReportsOfRun.Reset();
    ReportsOfRun.LocalReport.ReportEmbeddedResource = "follow_up.Report_Month.rdlc";
    ds.Name = "DataSetReport_Month_Table";
    ds.Value = Month_TableBindingSource;
    //ReportsOfRun.LocalReport.DataSources.Clear();
    ReportsOfRun.LocalReport.DataSources.Add(ds);
    ReportsOfRun.DocumentMapCollapsed = true;
   this.Month_TableTableAdapter.Fill(this.DataSetReport.Month_Table, txtMonth.Text);
}

thanx to how try to help me

Re: I Get it :D:D ;)

Pete O'Hanlon30-Nov-10 22:24

30-Nov-10 22:24

Well done, and well done for showing your solution. That's a bit of class that is. Big Grin | :-D

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

error while backup DB from C# "Backup failed for Server" [modified]

Nabawoka30-Nov-10 9:53