C# Discussion Boards - CodeProject

mav.northwind21-Jul-07 23:13

21-Jul-07 23:13

The generic Dictionary<> class has to be parameterized with two types (one for the keys and one for the values).
Guessing from your variable name you must write something like this:

Dictionary<string, ILayer> g_LyrNameToILayer = new Dictionary<string, ILayer>();

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: How to use Dictionary?

Nothend21-Jul-07 23:21

Nothend

21-Jul-07 23:21

Thanks,What you said is right,but,i want the Key is type of string,and the Value is type of pointer,It seems to be that pointer can't be a para in Dictionary.
so,how shoud i do?

Re: How to use Dictionary?

Larantz22-Jul-07 0:11

Larantz

22-Jul-07 0:11

What mav is saying should be sufficient if you're mapping up 'Name' with an instance of 'ILayer'.

Dictionary<string, ILayer> layerDict = new Dictionary<string, ILayer>();
List<ILayer> layers = GetLayers(); //some method of propagating layers.


int counter = 0;
foreach(ILayer layer in layers)
{
   layerDict.Add("Layer" + counter, layer);
   counter++;
}


...
//Retrieve a layer
ILayer layerOne = null;

if(layerDict.ConstainsKey("Layer1"))
{
   layerOne = layerDict["Layer1"];
}

//do something with the layer.

Best regards!

-Larantz-

for those about to code, we salute you
http://www.tellus-software.com

Re: How to use Dictionary?

Nothend22-Jul-07 0:21

Nothend

22-Jul-07 0:21

Thank u very much!

Re: How to use Dictionary?

Nothend22-Jul-07 0:24

Nothend

22-Jul-07 0:24

Thank you very much!

Persistentn publish-subscribe in wcf

xshift21-Jul-07 22:10

xshift

21-Jul-07 22:10

I am trying to create a persistent pub-sub application using wcf.
When a client subscribes to the service it passes a URI and a mehtod name.
When the service needs to callback the client it connects to the URI using a known contract (which can be passed too in a more complex scenario) and activates the method.
My problem is how to listen to the URI on the CLIENT after subscribing.
I know how to do that using a ServiceHost but all I need is a listener for the contract the client exposes.

Is there a way of listening to an "ICallback" (not IReplyChannel or IInputChannel)?

Thanks,

xshift

Global Assembly Cache

George_George21-Jul-07 20:12

George_George

21-Jul-07 20:12

Hello everyone,

I have used gacutil tool to install my COM dll into Global Assembly Cache,

http://msdn2.microsoft.com/en-us/library/ex0ss12c(VS.80).aspx

But I am not sure whether I need to manually copy the actual assembly dll into some directory (like Windows\System32? Windows?) after running this tool? Or gacutil tool will automatically copy (install) the assembly for me -- so I only need to run gacutil -i <dllname>?

thanks in advance,
George

Re: Global Assembly Cache

mav.northwind21-Jul-07 21:24

mav.northwind

21-Jul-07 21:24

Hi!
You don't have to copy the assembly somewhere else. That's what the GAC is all about... Smile | :)

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Global Assembly Cache

George_George21-Jul-07 22:04

George_George

21-Jul-07 22:04

Thanks mav!

You mean GAC will store the dll in some hidden place? I have searched my machine but can not find where GAC has copied my dll.

A further question, I think when a CLSID is used for CoCreateInstance, GAC should be used for searching the codebase dll containing the implementation of the CLSID, right?

But, for most COM server, they are not in GAC (in GAC, if we list all entries, only tens of items.), so I think there should be some other ways to find codebase dll, other than through GAC, right? So, what are the other ways to find CLSID related codebase dll?

regards,
George

Re: Global Assembly Cache

mav.northwind21-Jul-07 23:10

mav.northwind

21-Jul-07 23:10

You can see what's in the GAC more easily than using gacutil by pointing your windows explorer to %WINDIR%\Assemblies.

When a COM server must be created, windows takes a look at HKCR\CLSID\COM Class ID\InprocServer32 (I'm skipping out-of-proc servers deliberately to keep it simple).
The value of this key is used to find the dll containing the implementation (a little simplified, once again).

For managed COM servers this value points to mscoree.dll and only for this type of servers the CodeBase value is neccessary. You can run regedit and then search for "codebase" inside of HKCR\CLSID to see several examples for the required structure of registry entries for managed COM servers.

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Global Assembly Cache

George_George22-Jul-07 0:25

George_George

22-Jul-07 0:25

Thanks mav,

Your described process to load related dll is informative. But it has nothing to do with GAC? I am wondering what is the function of GAC in your following process?

BTW: I find in my Windows registry there are additional Assembly and Class value -- not every mscoree.dll has CodeBase.

I think Assembly is the name in GAC, and Class is for the entry point CLSID for CoCreateInstance? Right?

mav.northwind wrote:
When a COM server must be created, windows takes a look at HKCR\CLSID\COM Class ID\InprocServer32 (I'm skipping out-of-proc servers deliberately to keep it simple).
The value of this key is used to find the dll containing the implementation (a little simplified, once again).

For managed COM servers this value points to mscoree.dll and only for this type of servers the CodeBase value is neccessary. You can run regedit and then search for "codebase" inside of HKCR\CLSID to see several examples for the required structure of registry entries for managed COM servers.

regards,
George

Re: Global Assembly Cache

mav.northwind22-Jul-07 4:09

mav.northwind

22-Jul-07 4:09

I didn't look into every detail of the registration of managed COM servers, but Junfeng Zhang has a very valuable blog talking about the inner workings of fusion, COM activation, the GAC and other related topics:
http://blogs.msdn.com/junfeng[^]

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Global Assembly Cache

George_George23-Jul-07 3:31

George_George

23-Jul-07 3:31

Thanks mav,

The blog is very informative. A lot of information... Could you let me know which part do you mean? I felt I lost my way when reading the Blog for 10 minutes. Smile | :)

regards,
George

Finally!

max2929721-Jul-07 17:55

max29297

21-Jul-07 17:55

I finally got visual c# studio to install on my computer! My grandpa, who's visiting, downloaded the iso images to his computer and burned it to a cd for me, because my dad's can't burn cd's. It's installing as I am typing this... Thank you guys for helping me along the way. Sorry, I didn't know if I should post this here or not... I hope I don't get in trouble 'cause it's not a question... Smile | :)

Oh, and don't mind the sig...

-----
*** Never give me an answer having anything to do with Visual Studio. I don't have this because I have two computers, one being my dad's mac, which is connected to the internet, the other being my pc, which is, sadly, not connected to the internet. The setup for the Visual C# program I think is called a "bootstrap" program, and it needs to connect to the internet to install the program. THEREFORE I cannot install this program onto my pc.***

Re: Finally!

Paul Conrad21-Jul-07 18:38

Paul Conrad

21-Jul-07 18:38

max29297 wrote:
I finally got visual c# studio to install on my computer!

Cheers, have fun with it Smile | :)

Maybe you can change your sig about not having VS Roll eyes | :rolleyes:

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus

Re: Finally!

max2929721-Jul-07 19:56

max29297

21-Jul-07 19:56

Wow, I've tried it and it makes Windows Form Applications much easier to make. It's a lot better than guessing the x and y values for every single control...

Paul Conrad wrote:
Maybe you can change your sig about not having VS

Well maybe you should've looked at the last line of the message you just quoted...

If I had a sig, it would probably go here.

Re: Finally!

mav.northwind21-Jul-07 21:25

mav.northwind

21-Jul-07 21:25

Gz!
Now finally you can start developing like decent people do Wink | ;)

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Finally!

max2929722-Jul-07 10:16

max29297

22-Jul-07 10:16

So you're saying I'm not decent?

If I had a sig, it would probably go here.

Re: Finally!

mav.northwind22-Jul-07 19:01

mav.northwind

22-Jul-07 19:01

Please take a look here.[^]
The smiley should have been hint enough.

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Finally!

Luc Pattyn22-Jul-07 1:00

Luc Pattyn

22-Jul-07 1:00

Hi Max, good for you. Enjoy VS !

if and when it gives you extra problems, there is a separate discussion forum on Visual Studio[^]

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Please i want help in crystal report with c#

MYOSRI21-Jul-07 10:34

MYOSRI

21-Jul-07 10:34

I want that create and print report with c#
but i want do every thing by code and don't use any option in visual studio
please help me

Re: Please i want help in crystal report with c#

Justin Perez21-Jul-07 10:59

Justin Perez

21-Jul-07 10:59

What part, specificly, are you having trouble with?

I get all the "news" I need from the weather report.

Re: Please i want help in crystal report with c#

MYOSRI21-Jul-07 11:15

MYOSRI

21-Jul-07 11:15

i just write this code in class named BindReport
public DataSet GetDataSet()
{
SqlConnection sqlconn = new SqlConnection(_connectstring);
SqlDataAdapter DA = new SqlDataAdapter("select aman_no,aman_name,aman_area from aman", sqlconn);
DataSet ds = new DataSet();
DA.Fill(ds,"aman");
return (ds);
}

and this code in form load

BindReport obj = new BindReport();
DataSet ds = obj.GetDataSet();
CrystalDecisions.CrystalReports.Engine.ReportDocument myRPTDocu = new CrystalDecisions.CrystalReports.Engine.ReportDocument();

myRPTDocu.Load(@"..\..\CrystalReport2.rpt");
myRPTDocu.SetDataSource(ds);
crystalReportViewer1.ReportSource = myRPTDocu;

and this code not work and give me exception "the report has no tables"

DataTable with rows and trying to move next and previous

Marcel Vreuls (www.agentbase.nl)21-Jul-07 9:38

Marcel Vreuls (www.agentbase.nl)

21-Jul-07 9:38

Hi,

I have the following situation and struggling with it. So hopefully someone can solve it or perhaps advice me another method. What I have is an Excel spreadsheet and a c# program.

In the program i load the excelsheet into a datatable

<br />
//Retrieve the excel data<br />
            Cursor = Cursors.WaitCursor;<br />
            InitExcel(ref _exr);<br />
            _dt = _exr.GetTable();<br />

So far so good. I can than loop trough the rows from the datatable like this

foreach (DataRow da in _dt.Rows)<br />
            {

and so on. What i would like to achive now is the following. In my datatable there are many rows. I would like to group rows where a certain column has the same value. It is a fact that rows where this is the case are underneath each other. So it thought lets move to the next row to see if the value is the same. if so read some columns and move on to the next row and do the same check. If the value is the same read the samen columns. If not i have another row and start over again. The result should than look something like

Source table
100;Nice product;100.0;Variant 0
100;Nice product;100.1;Variant 1
100;Nice product;100.2;Variant 2
200;Another nice product;200.0;Variant 0
200;Another nice product;200.1;Variant 1
200;Another nice product;200.2;Variant 2

100 Nice product
....100.0 Variant 0
....100.1 Variant 1
....100.2 Variant 2
200 Another nice product
....200.0 Variant 0
....200.1 Variant 1
....200.2 Varian 2

and so one. but i have not got a clue how to do this. I cannot figure this out. A bad but working solution is to add the datatable to a hidden grid on the form and perform this actions on the grid. but that is not the solution i am looking for Cool | :cool:

Hope this makes any sense Wink | ;)

and that someone can help me solve this issue

Kind regards,

Marcel Vreuls

http://www.marcelvreuls.com

<>

Re: DataTable with rows and trying to move next and previous

Amjath Rahman22-Jul-07 15:53

Amjath Rahman

22-Jul-07 15:53

in datatable u have a function called select(query)
u can use that will solve ur problem

it will get the collection of rows having the same column value and returnit as a row[].

ex
---
DataTable table = DataSet1.Tables["Orders"];
// Presuming the DataTable has a column named Date.
string expression;
expression = "Date > #1/1/00#";
DataRow[] foundRows;

// Use the Select method to find all rows matching the filter.
foundRows = table.Select(expression);

// Print column 0 of each returned row.
for(int i = 0; i < foundRows.Length; i ++)
{
Console.WriteLine(foundRows[i][0]);
}
}
with Regards
Amjath

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