I have looked everywhere and I can't seem to find how to make a simple table in C# winforms. Some say a Data set, a Data grid view, or a flow document. I want to just simply transfer values (scores, in my case.) to an XML doc and display the values on a table in a form. I already found out how to transfer values to a.txt file using the Stream Reader class. Is there a similar way I could do the same with data and a table? Do I have to make a SQL Server? I didn't know this would be so difficult to find an answer to... Thank you, this really helps.
Have you tried ListView? You can parse your txt file using StreamReader, and keep the scores in list i.e.: List<score> scores. Then update your ListView, in a foreach cycle, for example:
scoresListView.Clear();
foreach(var item in scores)
{
scoresListView.Add(item);
}
Unfortunately, ListView in WinForm does not allow design-time data binding. There's a good article about this: http://www.codeproject.com/Articles/10008/Data-binding-a-ListView
Related
I have a datatable in code. And the datagridview in the Ui.
In code I have done gridviewName.DataSource = dtTable1
Now in the UI I can see gridview populated with the table data. In the UI gridview I can update the cell values and/or delete the data rows. Upon doing any changes to the gridview, the changes automatically flow back into the data table.
I am bit confused at this point because I had thought it is a 1 way connection from data table into datagridview. Is this 2 way by design? If yes, then subsequently if I want to perform an operation per row, like send an email per row, then it is recommended to iterate over the gridview or the data table?
Yes, the 2 way data flow is by design; it makes creating applications a lot easier. If you don't want your user to edit a grid you make the grid read only, but typically you show data to a user, you let them edit it and save it. That would get a lot more hard work if you made data binding a one way thing the grid is connected to the datatable directly; it doesn't copy the data it finds into its own internal data array
Always loop over the datatable, read it and edit it directly; the grid will update accordingly; always avoid looping over the datagridview. As the embodiment of model-View-controller your code should manipulate the model (datatable) not try and manipulate the model via the view/controller that is intended for the user (the datagridview)
If you add a DataSet type file to your project and design a strongly typed datatable inside it your life gets easier. Your code looks like:
foreach(var r in soneDataset.EmailQueueDataTable){
mailer.Send(r.From, r.To, r.Subject, r.Message, r.RetryAttempts);
}
With a standard datatable everything is done with string column names or worse, ordinal positions and needs casting:
foreach(DataRow r in EmailQueueDataTable.Rows){
mailer.Send((string)r["From"], (string)r["To"], (string)r["Sujbect"], (string)r["Message"], (int)r["RetryAttempts"]);
}
Intellisense won't help you with the column names either; you'll only find out at runtime that I made a typo in Subject
I have built a program in WPF using Visual Basic that allows users to select from a series of items. The list of items may change as I add more items or remove older ones. Originally, I would just add and remove these items in the project code, and rebuild the executable.
Over time, however, the list of items grew and became tedious and impractical to maintain in the code. It occurred to me that it would be easier to store the items in a database table which the program can read, and the list can just be updated by adding and removing items from this database.
I have the database built, and I've added it as a Data Source. I have the data connection set up and everything is ready to go.
What I need to know is how to set the Content property of a label to a cell from a table in the database. I want to do this in the codebehind, not in markup (XAML).
My guess is that I will need to set up a sort of query with a for loop to find the cell I want.
The name of the database is ItemsDB. It contains a table called ItemsTable, and the fields in the table have a unique ID (key) with an AutoNumber data type. The column containing the data I want is named ItemLabel.
So, to sum it all up, I want a label to show the content from a single cell in the database, specified in the codebehind. Either C# or VB is fine.
EDIT
I guess I should've mentioned that the labels themselves actually function as buttons, and I don't really want to display a ListView if I don't have to. I know it's not helpful to not have any code posted, but I don't even know where to start, so there's no code to post.
Took a while longer than I expected, hope this is still useful. So, what you want to do is iterate through a collection and create a new Label for each row.
You will need a container for the Labels, I used WrapPanel, but you can use any Panel you want. I'm replacing your Data Source with a simple DataTable, you'll get the point from this:
foreach (DataRow row in YourItemsTable.Rows)
{
Label newLabel = new Label();
newLabel.Content = row["ItemLabel"].ToString();
// If you need some events, attach the handlers here
yourParentContainerPanel.Children.Add(newLabel);
}
This should be all you need.
So I'm reading data out of a database and want to display it on a webpage like this:
Name Age Fav# ...other info
Bob 11 15
Joe 13 4
I want to make a website that updates the contents of its table based on the database. I know the number of columns that the database has but not necessarily the number of rows.
I was thinking just writing the .aspx file and generating the HTML and values when the database is read, but I was looking at some similar stackoverflow questions and they advise against it? The suggestion was to create a template .aspx file and just populate it, but how would you do that if you don't know the exact number of rows to make?
Also if I programatically write my own Something.aspx files and create a Something.aspx.cs file, will they automatically link together?
I'm new to ASP.net and C#, so I'm not sure if there's an easier way of doing this.
Since you're using ASP.NET I'd suggest using GridView control to display table data. It has a lot more possibilities (like built in paging and sorting). And you do not need to know in advance number of rows - GridView will render whatever is thrown at it, turning on paging if nessesery
I want to read data from a text file and show in a table (much like the DataGrid / DataGridView classes). The txt file must be local and not sql based (like the mentioned classes).
Doing this in C# windows form.
Any ideas?
If you have any questions I will edit this question as needed.
EDIT:
This seems to work:
this.DataGridView1.Rows(1).Cells(1).Value = stringReader;
Open up a filestream and parse your values into a DataTable... then set your grid's datasource to the datatable. Try that out and update if you have any problems :)
I am working on a website and I have some db table called "downloads" where I have files I want users to download. The files are bound to "download type" table.
I know how to display the data from the db on the page, but how do I "split" it so that I have for eg.
download type 1
file 1
file 2
file 3
download type 2
file 1
file 2
file 3
download type 3
file 1
file 2
file 3
... I hope my question is reasonable...
So, the "non-dynamic" way would be to make a datalist for each entry, but what if the user puts one more "donwload type" in the db..?
Any tips are welcome!
Thanks for your time!
You could use a repeater or a GridView to perform this task.
If you have access to LINQ:
Create a LINQ query to get all of the data into a sorted IQueryable object that is sorted by download type. You can then iterate through this list using a repeater or a gridview and each time you come to a new download type, you can output the bolded type before continuing with the next item of data.
If you're stuck using datatables
Get your data down into a datatable and make sure it's sorted by download type. Then you can use the DefaultView of the table to perform filters or with a repeater you can follow similar instructions to above.
Keep in mind, you'll have to use the onDataBound events of these items and keep track of the current downloadtype with a global variable.
This can be accomplished using a GridView with grouping. Unfortunately, the ASP.NET Gridview doesn't make this as easy as it should be. But here is an article about how to do this:
http://aspalliance.com/1268_CodeSnip_How_to_Group_Data_in_the_GridView_Control.all
You can use this technique to bind your data to a Gridview and then Group by the Download Type column.
There are 3rd party products which make this extremely easy, but they aren't always free. One that we use is DevExpress. With their GridView you just tell it which column(s) to group by and you're done. If this is something you need to do routinely or would like to allow you users to do, then it would be worth buying.