Why propertychanged is null

Already on GitHub? Sign in to your account. The thing is that the System. As stated in the INotifyPropertyChanged. PropertyChanged Event topic, the null parameter is valid and indicates that all properties were changed.

However, if you raise this event in UWP as follows:. We expect that the PropertyChanged event with a null parameter won't cause any error, as documented. This code worked in our libraries in all platforms for more than 10 years, and we cannot change it without a breaking change for our customers just to fix this UWP issue. The text was updated successfully, but these errors were encountered:. MikeHillberg Is this a bug in the. NET v. Posted 4-Jun pm Sergey Alexandrovich Kryukov.

Wbehning 5-Jun am. I have other implementations where this does work. I just does not work for this particular Veiw, ViewModel, and Model. Meet the same problem,I finally figure out that the datacontext set in. But when i set page datacontext in background. Posted Dec pm WilllllChen. It does work, just not the way that you want Add your solution here.

OK Paste as. Treat my content as plain text, not as HTML. Existing Members Sign in to your account. This email is in use. Do you need your password? The event is raised only when the property value has changed. This helps to avoid stack overflows when properties influence each other. Sometimes a property does not have a setter. The property value could still change without a setter.

In such a case it is necessary to raise the PropertyChanged event as well. These properties are also known as calculated properties. The example above shows that these properties could be separated in sub classes.

This way it is necessary to listen for the PropertyChanged calls of the base class to be informed when a dependent property has changed. This straight-forward implementation is simple to understand and easy to implement. But it comes with a major drawback. The property name is defined as string constant inside the code. Microsoft introduced a new compiler feature in C 5. It allows the usage of the CallerMemberNameAttribute to generate the property name during compile time.

The implementation shows how this looks like. If the optional parameter propertyName is omitted then the compiler inserts the member name of the caller. If you insist on using a Component, you'll have to add the controls to the form yourself. Tried to myView. Windows Forms 13 Is there a function which can disable a control with making the control grey out?

The best you can do is set a flag in your code that would mimic the Enabled property Although this solution uses a DataTable as the DGV's source, it should not be too difficult to adapt it to other sources. The basic problem when using a table as a DGV's source is the closely guarded nature of System. Data assembly. All this makes interchanging two rows in a table during the Sort operation extremely difficult.

The idea is simple. I have used this approach in a Grid containing nearly 30K rows with considerably good performance. So, I believe performance also should not be an issue. Object, ByVal e As System. WaitCursor 'Get the column whose header was clicked. Columns e. If col. Dim sortOrder As Windows. SortOrder If col. Rows rowList. Add row Next 'Sort the rows, using the desired comparer. Sort comparer 'Copy sorted rows to a new DataTable.

Dim sortedTable As DataTable 'Following two instructions amount to copying of the Schema of the original table to the 'new table. Clone sortedTable. Clear sortedTable. ImportRow row Next sortedTable. EndLoadData 'Set the new sorted table as the Grid's datasource.

Columns col. Programmatic dgv. IComparer Of DataRow. Compare 'Extract the column values on which custom sorting is to be performed from the two rows. If Me. Now, when you click a column header of a DGV bound to a DataTable, the data is sorted based on the default ordering of the Column's value type. However, as the documentation says, this operation is implemented by the underlying DataSource, i.

This means that the DataTable class provides some sort of sorting functionality, that is hidden inside the System. Data assembly probably using Friend modifiers. Thanks for any! Windows Forms 16 How to bind control state to another control state Hi, Let's say I have a checkbox and a groupbox.