Changing a WPF Datagrid Row background color programmatically
0
I'm facing issues when trying to change a datagrid row in the code behind of a WPF app, my objectif is to change the row color when the row is selected and when a button "Valider" is clicked, my code is shown below.
I found some answers but none of them where usefull for my case.
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.SelectedItem as DataGridRow;
dataGridRow.Background = Brushes.Green;
}
When I execute, I get a nullreferenceexception, the debugger point to the dataGridRow to be null (the row contains data though).
c# wpf datagrid
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
|
show 2 more comments
0
I'm facing issues when trying to change a datagrid row in the code behind of a WPF app, my objectif is to change the row color when the row is selected and when a button "Valider" is clicked, my code is shown below.
I found some answers but none of them where usefull for my case.
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.SelectedItem as DataGridRow;
dataGridRow.Background = Brushes.Green;
}
When I execute, I get a nullreferenceexception, the debugger point to the dataGridRow to be null (the row contains data though).
c# wpf datagrid
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
have you checked if the particular row is not null?
– mahlatse
Nov 20 '18 at 11:49
Yes! @mahlatse, as I said, the row does contain data, but the variable dataGridRow is null.
– Saber CHETIOUI
Nov 20 '18 at 11:56
I don't know the why, but always try to make sure your data (DataGridRowin your code) is notnull. You can do something likeif (!(InventaireItemGrid.SelectedItem is DataGridRow dataGridRow) return;
– Gonzo345
Nov 20 '18 at 12:06
1
Isn't the selected item a property of your ViewModel? e.g if your datacontext is of type A, then the secleted item is of A.B where B is some property of A, what you should be looking at is filtering the sender object, cast it to the appropriate type type.
– mahlatse
Nov 20 '18 at 12:14
1
"as" returns null if the object has not the expected type. Set a breakpoint and check the type of InventaireItemGrid.SelectedItem at runtime. Knowing that type should hopefully tell you how to find the corresponding dataGridRow.
– Peter Huber
Nov 21 '18 at 14:44
|
show 2 more comments
0
0
0
I'm facing issues when trying to change a datagrid row in the code behind of a WPF app, my objectif is to change the row color when the row is selected and when a button "Valider" is clicked, my code is shown below.
I found some answers but none of them where usefull for my case.
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.SelectedItem as DataGridRow;
dataGridRow.Background = Brushes.Green;
}
When I execute, I get a nullreferenceexception, the debugger point to the dataGridRow to be null (the row contains data though).
c# wpf datagrid
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
I'm facing issues when trying to change a datagrid row in the code behind of a WPF app, my objectif is to change the row color when the row is selected and when a button "Valider" is clicked, my code is shown below.
I found some answers but none of them where usefull for my case.
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.SelectedItem as DataGridRow;
dataGridRow.Background = Brushes.Green;
}
When I execute, I get a nullreferenceexception, the debugger point to the dataGridRow to be null (the row contains data though).
c# wpf datagrid
c# wpf datagrid
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
asked Nov 20 '18 at 11:36
Saber CHETIOUISaber CHETIOUI
269
269
have you checked if the particular row is not null?
– mahlatse
Nov 20 '18 at 11:49
Yes! @mahlatse, as I said, the row does contain data, but the variable dataGridRow is null.
– Saber CHETIOUI
Nov 20 '18 at 11:56
I don't know the why, but always try to make sure your data (DataGridRowin your code) is notnull. You can do something likeif (!(InventaireItemGrid.SelectedItem is DataGridRow dataGridRow) return;
– Gonzo345
Nov 20 '18 at 12:06
1
Isn't the selected item a property of your ViewModel? e.g if your datacontext is of type A, then the secleted item is of A.B where B is some property of A, what you should be looking at is filtering the sender object, cast it to the appropriate type type.
– mahlatse
Nov 20 '18 at 12:14
1
"as" returns null if the object has not the expected type. Set a breakpoint and check the type of InventaireItemGrid.SelectedItem at runtime. Knowing that type should hopefully tell you how to find the corresponding dataGridRow.
– Peter Huber
Nov 21 '18 at 14:44
|
show 2 more comments
have you checked if the particular row is not null?
– mahlatse
Nov 20 '18 at 11:49
Yes! @mahlatse, as I said, the row does contain data, but the variable dataGridRow is null.
– Saber CHETIOUI
Nov 20 '18 at 11:56
I don't know the why, but always try to make sure your data (DataGridRowin your code) is notnull. You can do something likeif (!(InventaireItemGrid.SelectedItem is DataGridRow dataGridRow) return;
– Gonzo345
Nov 20 '18 at 12:06
1
Isn't the selected item a property of your ViewModel? e.g if your datacontext is of type A, then the secleted item is of A.B where B is some property of A, what you should be looking at is filtering the sender object, cast it to the appropriate type type.
– mahlatse
Nov 20 '18 at 12:14
1
"as" returns null if the object has not the expected type. Set a breakpoint and check the type of InventaireItemGrid.SelectedItem at runtime. Knowing that type should hopefully tell you how to find the corresponding dataGridRow.
– Peter Huber
Nov 21 '18 at 14:44
have you checked if the particular row is not null?
– mahlatse
Nov 20 '18 at 11:49
have you checked if the particular row is not null?
– mahlatse
Nov 20 '18 at 11:49
Yes! @mahlatse, as I said, the row does contain data, but the variable dataGridRow is null.
– Saber CHETIOUI
Nov 20 '18 at 11:56
Yes! @mahlatse, as I said, the row does contain data, but the variable dataGridRow is null.
– Saber CHETIOUI
Nov 20 '18 at 11:56
I don't know the why, but always try to make sure your data (
DataGridRowin your code) is not null. You can do something like if (!(InventaireItemGrid.SelectedItem is DataGridRow dataGridRow) return;– Gonzo345
Nov 20 '18 at 12:06
I don't know the why, but always try to make sure your data (
DataGridRowin your code) is not null. You can do something like if (!(InventaireItemGrid.SelectedItem is DataGridRow dataGridRow) return;– Gonzo345
Nov 20 '18 at 12:06
1
1
Isn't the selected item a property of your ViewModel? e.g if your datacontext is of type A, then the secleted item is of A.B where B is some property of A, what you should be looking at is filtering the sender object, cast it to the appropriate type type.
– mahlatse
Nov 20 '18 at 12:14
Isn't the selected item a property of your ViewModel? e.g if your datacontext is of type A, then the secleted item is of A.B where B is some property of A, what you should be looking at is filtering the sender object, cast it to the appropriate type type.
– mahlatse
Nov 20 '18 at 12:14
1
1
"as" returns null if the object has not the expected type. Set a breakpoint and check the type of InventaireItemGrid.SelectedItem at runtime. Knowing that type should hopefully tell you how to find the corresponding dataGridRow.
– Peter Huber
Nov 21 '18 at 14:44
"as" returns null if the object has not the expected type. Set a breakpoint and check the type of InventaireItemGrid.SelectedItem at runtime. Knowing that type should hopefully tell you how to find the corresponding dataGridRow.
– Peter Huber
Nov 21 '18 at 14:44
|
show 2 more comments
1 Answer
1
active
oldest
votes
1
The SelectedItem property refers to the corresponding object in the Items collection. You could use the ItemContainerGenerator to get a reference to the DataGridRow container:
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.ItemContainerGenerator.ContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow;
if (dataGridRow != null)
dataGridRow.Background = Brushes.Green;
}
There are most probably better ways of doing whatever you are trying to do though, for example using data binding and triggers.
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
add a comment |
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The SelectedItem property refers to the corresponding object in the Items collection. You could use the ItemContainerGenerator to get a reference to the DataGridRow container:
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.ItemContainerGenerator.ContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow;
if (dataGridRow != null)
dataGridRow.Background = Brushes.Green;
}
There are most probably better ways of doing whatever you are trying to do though, for example using data binding and triggers.
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
add a comment |
1
The SelectedItem property refers to the corresponding object in the Items collection. You could use the ItemContainerGenerator to get a reference to the DataGridRow container:
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.ItemContainerGenerator.ContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow;
if (dataGridRow != null)
dataGridRow.Background = Brushes.Green;
}
There are most probably better ways of doing whatever you are trying to do though, for example using data binding and triggers.
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
add a comment |
1
1
1
The SelectedItem property refers to the corresponding object in the Items collection. You could use the ItemContainerGenerator to get a reference to the DataGridRow container:
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.ItemContainerGenerator.ContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow;
if (dataGridRow != null)
dataGridRow.Background = Brushes.Green;
}
There are most probably better ways of doing whatever you are trying to do though, for example using data binding and triggers.
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
The SelectedItem property refers to the corresponding object in the Items collection. You could use the ItemContainerGenerator to get a reference to the DataGridRow container:
private void Valider_Click(object sender, RoutedEventArgs e)
{
DataGridRow dataGridRow = InventaireItemGrid.ItemContainerGenerator.ContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow;
if (dataGridRow != null)
dataGridRow.Background = Brushes.Green;
}
There are most probably better ways of doing whatever you are trying to do though, for example using data binding and triggers.
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
answered Nov 20 '18 at 12:08
mm8mm8
85k81932
85k81932
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
add a comment |
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
I already tried that while I was searching for answers, it did'nt work since the "ItemContainerGenerator" is obsolete in my framework and has been replaced by "GetContainerFromItem" method, therefore I tried this : DataGridRow dataGridRow = InventaireItemGrid.GetContainerFromItem(InventaireItemGrid.SelectedItem) as DataGridRow; and I still get a nullreference.
– Saber CHETIOUI
Nov 20 '18 at 12:15
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
In "your" framework? What are you talking about? And what does the SelectedItem property return?
– mm8
Nov 20 '18 at 12:18
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
It's not a wpf object it's a control that I added, it's called Xceed Datagrid (it has a nice grouping, searching and sorting features) and it does'nt have the "ItemContainerGenerator" property anymore. I know I should change the header of my question then.
– Saber CHETIOUI
Nov 20 '18 at 12:38
add a comment |
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have you checked if the particular row is not null?
– mahlatse
Nov 20 '18 at 11:49
Yes! @mahlatse, as I said, the row does contain data, but the variable dataGridRow is null.
– Saber CHETIOUI
Nov 20 '18 at 11:56
I don't know the why, but always try to make sure your data (
DataGridRowin your code) is notnull. You can do something likeif (!(InventaireItemGrid.SelectedItem is DataGridRow dataGridRow) return;– Gonzo345
Nov 20 '18 at 12:06
1
Isn't the selected item a property of your ViewModel? e.g if your datacontext is of type A, then the secleted item is of A.B where B is some property of A, what you should be looking at is filtering the sender object, cast it to the appropriate type type.
– mahlatse
Nov 20 '18 at 12:14
1
"as" returns null if the object has not the expected type. Set a breakpoint and check the type of InventaireItemGrid.SelectedItem at runtime. Knowing that type should hopefully tell you how to find the corresponding dataGridRow.
– Peter Huber
Nov 21 '18 at 14:44