Binding to a property that's pulling data from another property
0
I have an observable collection property that holds some instances of a custom class and a string property that outputs the sum of some data in the observable collection property. Like this...
public ObservableCollection<MyClass> MyClasses
{
get
{
return _myClasses;
}
set
{
_myClasses = value;
OnPropertyChanged("MyClasses");
// I thought the following might work but it doesn't seem to
OnPropertyChanged("TotalTime");
}
}
public string TotalTime
{
get
{
int totalTime = 0;
foreach (MyClass myClass in MyClasses)
{
totalTime += myClass.Timespan;
}
return TimeSpan.FromMinutes(totalTime).ToString(@"h:mm:ss");
}
}
As elements are added/removed from MyClasses I have a TextBlock that I want to bind the Text property to TotalTime, but it is not working.
Any ideas or tricks to make this work?
c# wpf binding
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
add a comment |
0
I have an observable collection property that holds some instances of a custom class and a string property that outputs the sum of some data in the observable collection property. Like this...
public ObservableCollection<MyClass> MyClasses
{
get
{
return _myClasses;
}
set
{
_myClasses = value;
OnPropertyChanged("MyClasses");
// I thought the following might work but it doesn't seem to
OnPropertyChanged("TotalTime");
}
}
public string TotalTime
{
get
{
int totalTime = 0;
foreach (MyClass myClass in MyClasses)
{
totalTime += myClass.Timespan;
}
return TimeSpan.FromMinutes(totalTime).ToString(@"h:mm:ss");
}
}
As elements are added/removed from MyClasses I have a TextBlock that I want to bind the Text property to TotalTime, but it is not working.
Any ideas or tricks to make this work?
c# wpf binding
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
What have you tried? Provide the information. Binding toTotalTimeseems like that should work.
– ΩmegaMan
Nov 15 '18 at 23:26
1
The setter will not be invoked when you add/remove items. You could use the collection changed event to publish the property changed event for TotalTime.
– musium
Nov 15 '18 at 23:38
Possible duplicate of ObservableCollection setter isn't firing when item is added
– EpicKip
Nov 16 '18 at 14:17
@musium - What about for when an item in the collection is changed? Like a string property in an item is updated?
– user642153
Nov 16 '18 at 15:19
add a comment |
0
0
0
I have an observable collection property that holds some instances of a custom class and a string property that outputs the sum of some data in the observable collection property. Like this...
public ObservableCollection<MyClass> MyClasses
{
get
{
return _myClasses;
}
set
{
_myClasses = value;
OnPropertyChanged("MyClasses");
// I thought the following might work but it doesn't seem to
OnPropertyChanged("TotalTime");
}
}
public string TotalTime
{
get
{
int totalTime = 0;
foreach (MyClass myClass in MyClasses)
{
totalTime += myClass.Timespan;
}
return TimeSpan.FromMinutes(totalTime).ToString(@"h:mm:ss");
}
}
As elements are added/removed from MyClasses I have a TextBlock that I want to bind the Text property to TotalTime, but it is not working.
Any ideas or tricks to make this work?
c# wpf binding
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
I have an observable collection property that holds some instances of a custom class and a string property that outputs the sum of some data in the observable collection property. Like this...
public ObservableCollection<MyClass> MyClasses
{
get
{
return _myClasses;
}
set
{
_myClasses = value;
OnPropertyChanged("MyClasses");
// I thought the following might work but it doesn't seem to
OnPropertyChanged("TotalTime");
}
}
public string TotalTime
{
get
{
int totalTime = 0;
foreach (MyClass myClass in MyClasses)
{
totalTime += myClass.Timespan;
}
return TimeSpan.FromMinutes(totalTime).ToString(@"h:mm:ss");
}
}
As elements are added/removed from MyClasses I have a TextBlock that I want to bind the Text property to TotalTime, but it is not working.
Any ideas or tricks to make this work?
c# wpf binding
c# wpf binding
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
edited Nov 15 '18 at 23:25
ΩmegaMan
16.3k54562
16.3k54562
asked Nov 15 '18 at 23:16
user642153
What have you tried? Provide the information. Binding toTotalTimeseems like that should work.
– ΩmegaMan
Nov 15 '18 at 23:26
1
The setter will not be invoked when you add/remove items. You could use the collection changed event to publish the property changed event for TotalTime.
– musium
Nov 15 '18 at 23:38
Possible duplicate of ObservableCollection setter isn't firing when item is added
– EpicKip
Nov 16 '18 at 14:17
@musium - What about for when an item in the collection is changed? Like a string property in an item is updated?
– user642153
Nov 16 '18 at 15:19
add a comment |
What have you tried? Provide the information. Binding toTotalTimeseems like that should work.
– ΩmegaMan
Nov 15 '18 at 23:26
1
The setter will not be invoked when you add/remove items. You could use the collection changed event to publish the property changed event for TotalTime.
– musium
Nov 15 '18 at 23:38
Possible duplicate of ObservableCollection setter isn't firing when item is added
– EpicKip
Nov 16 '18 at 14:17
@musium - What about for when an item in the collection is changed? Like a string property in an item is updated?
– user642153
Nov 16 '18 at 15:19
What have you tried? Provide the information. Binding to
TotalTime seems like that should work.– ΩmegaMan
Nov 15 '18 at 23:26
What have you tried? Provide the information. Binding to
TotalTime seems like that should work.– ΩmegaMan
Nov 15 '18 at 23:26
1
1
The setter will not be invoked when you add/remove items. You could use the collection changed event to publish the property changed event for TotalTime.
– musium
Nov 15 '18 at 23:38
The setter will not be invoked when you add/remove items. You could use the collection changed event to publish the property changed event for TotalTime.
– musium
Nov 15 '18 at 23:38
Possible duplicate of ObservableCollection setter isn't firing when item is added
– EpicKip
Nov 16 '18 at 14:17
Possible duplicate of ObservableCollection setter isn't firing when item is added
– EpicKip
Nov 16 '18 at 14:17
@musium - What about for when an item in the collection is changed? Like a string property in an item is updated?
– user642153
Nov 16 '18 at 15:19
@musium - What about for when an item in the collection is changed? Like a string property in an item is updated?
– user642153
Nov 16 '18 at 15:19
add a comment |
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What have you tried? Provide the information. Binding to
TotalTimeseems like that should work.– ΩmegaMan
Nov 15 '18 at 23:26
1
The setter will not be invoked when you add/remove items. You could use the collection changed event to publish the property changed event for TotalTime.
– musium
Nov 15 '18 at 23:38
Possible duplicate of ObservableCollection setter isn't firing when item is added
– EpicKip
Nov 16 '18 at 14:17
@musium - What about for when an item in the collection is changed? Like a string property in an item is updated?
– user642153
Nov 16 '18 at 15:19