dbml | Database Markup Language , designed to define | Database library
kandi X-RAY | dbml Summary
kandi X-RAY | dbml Summary
DBML (database markup language) is a simple, readable DSL language designed to define database structures. For more information, please check out DBML homepage.
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QUESTION
Semi-regarding this post of mine from several years ago: C# WPF DataGridTextColumn custom property
I've needed to make some changes so that the total in my datagrid updates when other fields change. This means my workaround (the edit button) goes away, so I am trying to make some modifications to the partial linq to sql class for a view that I use for calculations by implementing INotifyPropertyChanged (I just set the view primary key).
I'm using this as a reference: Calculated column in datagrid WPF
I can make this work if I can change the behavior of the PaySum_Total getter in the auto generated class from this:
ANSWER
Answered 2022-Mar-02 at 14:24You could implement a default constructor or method in the partial non-autogenrated class that handles the PropertyChanged
event (that I assume that the auto-generated SendPropertyChanged
method raises), and then update and raise the PropertyChanged
event for the PaySum_Total_Pay
in the event handler. Something like this:
QUESTION
I'm strugling with this query, i think I'm missing something. I have two autogenerated dbml models.
...ANSWER
Answered 2021-Jun-04 at 21:54In LINQ-to-SQL it's a bit messy and not intuitive to do this. You have to use DataLoadOptions:
QUESTION
so i want to insert an obj into a table of sql using linq to sql and when i submit the change the grid view wont update itself no matter what it shows the data at first but the new obj wont show up data comes from a dbml ,
i would really appreciate a hand
...ANSWER
Answered 2020-Sep-29 at 21:15Dg_1.Items.Refresh();
is not required and should be removed.
Dg_1.ItemsSource = null;
is not required and should be removed.
DataContext.SubmitChanges
is obviously generating an error and the transactions is rolled back or the query is not executed (because of table/entity errors).
You should check your entities and table for errors. E.g. your table must have a primary key defined to enable insert/update using LINQ to SQL.
You can use DataContext.GetChangeSet
to actually check if changes have been committed.
Alternatively omit LINQ to SQL and use db.ExecuteCommand
to execute a pure SQL query (e.g. in case you don't want or can't define a primary key for the table).
To fix the DataGrid
update issue assign a ObservableCollection
to the DataGrid.ItemsSource
.
ObservableCollection
implements INotifyCollectionChanged
which will atomatically update every ItemsControl
when an item is added/removed/moved/inserted:
QUESTION
I have a database with the link "dtschool.dbml" and I want to create this database in SQL Server When running this code
...ANSWER
Answered 2020-Sep-14 at 08:54Use This Method
QUESTION
I have a database Linq dbml I need to change the database name before creating
...ANSWER
Answered 2020-Aug-18 at 17:52Use This Method
QUESTION
I can't use any design surface, it causes all kinds of issues, so I have to manually edit the dbml file myself.
I've put this in the dbml:
...ANSWER
Answered 2020-Jun-25 at 18:13You have to add the IsComposable
property and set it to true
. This also allows other return types besides Int32
.
QUESTION
I want to make some changes to my database and it would be nice if I could update LINQ to SQL based on my data model as specified in a dbproj or sqlproj file rather than having to deploy my changes to an actual database and import them back in every time I want to change something. Is there any way to do this?
edit: to clarify, what I want to do is take a DACPAC project that I've created and generate/update a DBML file from it. I want to do this so that I don't have to go deploy all my experimental database changes every time I want to change my code, rather I can deploy them all at once when I'm ready to run it.
...ANSWER
Answered 2020-Mar-17 at 19:40what I want to do is take a DACPAC project that I've created and generate/update a DBML file from it.
There is no built-in tooling for that in LINQ 2 SQL or in Entity Framework.
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