How to set row header labels in a Datagrid? - C# Discussion Boards

15-Jul-03 7:41

Sounds like something that should be simple enough, but I can't find anything on the topic. I have noticed a few references, but they're not encouraging... Words to the effect that it can't be done.

Thanks.

Frank Olorin Rizzi15-Jul-03 7:53

15-Jul-03 7:53

If you want to set them at design time, use the properties of the data grid...
Click on the data Grid; in the Properties panel, you should find a row for "TableStyles" with value "(Collection)" and a "..." button. Click on that, and you access the dialog through which you can set up the table style...
you can add a new table style (or modify one that you already have), and in the right-hand side of this dialog you should find the Misc > GridColumnStyles property (with value "(Collection)" and the "..." button). Click on the "..." button to access the dialog to set up the column styles for the given table style.
You can add a new column style or modify a pre-existing one.
Each such column style has a HeaderText property you can set as needed.

If you wish to do all this at run-time, I suggest doing it once at design time and taking a look at the code generated by the Studio for you...

HTH,
FOR

work_to_live15-Jul-03 8:05

15-Jul-03 8:05

I don't have a problem with column headers, and I am creating them at run-time.

I can't figure out how to label the rows!

Frank Olorin Rizzi15-Jul-03 8:16

15-Jul-03 8:16

[quote]
I don't have a problem with column headers, and I am creating them at run-time.
[/quote]

Ooops ! My bad... sorry.
I don't know if/how you could set the row headers...
ALl I can think of is the RowHeaderWidth property of the data grid to set the width,
and the RowHeaderVisible property of the TableStyles to determine whether they are visible or not,
but I've never seen a place where you can set a row header label (or such...)...

I wouldn't be surprised if this is not allowed, since the DataGrid uses the row header (if they are
visible) to place the + symbol for a record leading to child records in another table...

Wish I could be more helpfull,
FOR

work_to_live15-Jul-03 8:28

15-Jul-03 8:28

Thanks... I'm new to C#, and the datagrid control. I may have selected the wrong control for the task. I was looking for the following functionality...

Row and column labels (datagrid has column labels, but not row labels)
User editable fields within the table (datagrid supports this)
bi-directional linkage to a datasource (datagrid supports this)
cut and paste cells between tables (don't think so)

The datagrid looked like a good choice, but I keep running into hurdles as if it was really meant for another application.

Frank Olorin Rizzi15-Jul-03 8:44

15-Jul-03 8:44

From what you describe, I would use the DataGrid.
As far as the row headers...
..depending on why/how you need them, it may be that you could use
the first column as "row header"... it's a work-around, and
it might not suite your application, but that's all I can suggest right now...

..after all the dataGrid seems to fit all of your other requirements, except for the
"cut-n-paste" across tables (hmmm... sounds like fun!).

Is the data grid's data source going to link you to a DB?
Are you looking for row headers because you know that you will always
display a given number of rows, and that each row represents something
specific? (in this case you might use simple labels, and separate
text controls to display the data instead of the data grid..)

FOR

work_to_live15-Jul-03 9:05

15-Jul-03 9:05

I was considering using the first row as the label, and I might end up doing that if all else fails. Right now I'm taking another look at the ListView control, but I'm starting the learning curve all over again! Smile | :)

I want to learn C#, but it's becoming difficult to resist the temptation to jump back to C++.

Thanks again for your time.

Not Active15-Jul-03 9:20

Not Active

15-Jul-03 9:20

Use the ItemCreated event to add whatever text you want to the datagrid row.

work_to_live15-Jul-03 9:33

Returning a collection class

15-Jul-03 9:33

Sounds interesting, but I don't see the ItemCreated Event in the datagrid class... Like I said earlier, I'm new to C# and the property soup for the various controls. I'm probably missing something obvious! Smile | :)

FileSystemWatcher

puppiesLover15-Jul-03 5:56

puppiesLover

15-Jul-03 5:56

I have a fileSystemWatcher object to watch for file changes under some directory and display a message for each file change. However, enven though I change the file only once, the message get displayed twice. The file is a .txt file. Anybody knows why this happens and how to fix it?
Thanks a lot

Andrew Bromfield15-Jul-03 4:26

15-Jul-03 4:26

Greetings,

I have created a custom collection class that I would like to return from a function (i.e. return customcollection;). However, a runtime error is generated when I call the function that's suppose to return the custom collection class. The error states that I should be returning the object type that's contained in the custom collection. (i.e. if my custom collection holds customer objects, then I should be returning a customer object, not the customcollection object.) The problem is that I need the collection returned with all the customer objects that it contains. (I want to bind this collection to a datagrid) Can anyone help me out with this. I know it's something simple that I'm missing.

Thanks in advance,

Andrew

Frank Olorin Rizzi15-Jul-03 6:18

15-Jul-03 6:18

[quote]
The error states that I should be returning the object type that's contained in the custom collection
[/quote]

My $0.02:
Sounds to me like a case of mis-match between the function signature and the function code.
What is your function's signature?

For instance, if it is
public myObject myFunction()
You should return an object of type myObject, but if it is
public myCollection myFunction()
you should be able to return an object of type myCollection, and I don't think anyone
-let alone the compiler- would look at what the myCollection object is holding...

Maybe you could post a snipplet?

HTH,
Frank

Andrew Bromfield15-Jul-03 6:22

15-Jul-03 6:22

Frank,

It looks like I'm on the right track, this is basically what I've got:

public IndividualCustomerCollection findCustomer()
{

IndividualCustomerCollection search_results = new IndividualCustomerCollection();
search_results.Add(new IndividualCustomer("John", "Smith", "(905) 428-1122"));
return search_results;
}

Your help is much appreciated,

Andrew

Frank Olorin Rizzi15-Jul-03 6:28

15-Jul-03 6:28

hmmm...

...so, search_result is an instance of the IndividualCustomerCollection class...
which looks right...

So, what exactly is the error message you get?
..is it a compile-time error or run-time error?

...also, does the erro rpoint you to a line in that snipplet,
or does it point you to the line where you are calling this function?

FOR

Andrew Bromfield15-Jul-03 6:50

15-Jul-03 6:50

The program compiles successfully, I get the run-time error when I try to call this function. The error points to the calling function. Here's a bigger snippet:

The following code is located in the cmdSearch_click event handler of the Customer Search Form:

If customer_type = "Individual" Then
Dim search_results As IndividualCustomerCollection = CustomerFacade.processCustomerSearch(customer_type)
lstViewResults.DataSource = search_results
End If

The following code is located on the client, within the business facade layer:

public static IndividualCustomerCollection processCustomerSearch(string customer_type)
{
IndividualCustomerCollection search_results;
string _customer_type = customer_type;

ICustomerFactory CustomerFactory = (ICustomerFactory) Activator.GetObject(typeof (ICustomerFactory, "http://localhost:1234/customerfactory.soap");
//This is where the runtime error occurs
search_results = CustomerFactory.findCustomer(customer_type);
return search_results;
}

The following code is located on the server, within the business rules layer:

public IndividualCustomerCollection findCustomer(string customer_type_
{
string _customer_type;
_customer_type = customer_type;

IndividualCustomerCollection search_results = new IndividualCustomerCollection();
search_results.Add(new IndividualCustomer("John", "Smith", "(905) 428-1122"));
return search_results;
}

NOTE: .NET Remoting is used to pass the collection from the server to the client. I know the remoting works because I've got debug messages that output the status of the server-side code execution. (For example, a message is displayed on the console window when an IndividualCustomer is added to the collection.

I'm truly stumped on this one, and it's something that should be so simple to do. I must be missing something, but what???

Your help is appreciated.

Andrew

Frank Olorin Rizzi15-Jul-03 7:18

15-Jul-03 7:18

Andrew,
I have no experience of .NET remoting, nor actually of mizing languages...

At first sight I don't spot any red flag...
If the run-time error points to the line
search_results = CustomerFactory.findCustomer(customer_type);
in processCustomerSearch, and has to deal with the data types involved, I would try
and step through the code, to see exactly where the problem arises...

For instance, if you use the debugger and step into the call to findCustomer,
when you reach the last statement in that function (return search_result; ) is
everything in order?
If so, when you execute that last statement, and return control to processCustomerSearch, is everything still in order?
I would add a dummy statement between
ICustomerFactory CustomerFactory = (ICustomerFactory) Activator.GetObject(typeof (ICustomerFactory, "http://localhost:1234/customerfactory.soap");
and
search_results = CustomerFactory.findCustomer(customer_type);
and another one between
search_results = CustomerFactory.findCustomer(customer_type);
and
return search_results;
to set up a break point and check if everything is as it should...

I wish I could point you to the problem, but I don't see what could be the issue...
...if you want, post the error message, which might provide some hints...
but if I were in you, I'd be playing with the debugger over and over to see exactly *where* something goes out of synch... (for instance, does the call to Activator.GetObject in processCustomerSearch act as expected?)

As I said, I haven't played with this kind of stuff, so I might be a poor help on this one (sorry Smile | :)

FOR

Andrew Bromfield15-Jul-03 8:06

15-Jul-03 8:06

Frank,

Thanks for the debugging suggestions. I haven't tried that yet. I'll let you know when I discover the solution to this issue. I really appreciate you taking the time to help me solve this problem.

Thanks again,

Andrew

Frank Olorin Rizzi15-Jul-03 12:19