Mixing
String To Double Converter with IValueConverter C#
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I have a View in which I should be able to input doubles. The thing is, I can only input whole numbers such as "100" but not "100.4". All my background calculations run on doubles though.
I'm now trying to bypass the problem by implementing a StringToDoubleConverter but my C# knowledge is still very limited.
I've implemented this into my UserControl.Resources tag
<local:StringToDoubleConverter x:Key="StringToDouble"/>
and created a new class StringToDoubleConverter:
class StringToDoubleConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
string stringNumber = value as string;
double.TryParse(stringNumber, out double val);
return val;
}
}
Finally I've implemented the converter into my binding:
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource StringToDouble}}"/>
My DelayTime in my DelayModel looks like this:
private double _delayTime;
public double DelayTime
{
get
{
return _delayTime;
}
set
{
if (value != _delayTime)
{
_delayTime = value; NotifyPropertyChanged();
}
}
}
I know my converter is somehow wrong. I'm struggling to get the right code to convert the string I want to input in my View to doubles.
For example: I want to input "0.7" into my View and DelayTime should actually get "0.7" and not just the "7". Is TryParse oder double.Parse(value) correct?
c# string double ivalueconverter converters
asked Jan 3 at 12:10
jan97conjan97con
257
|
show 4 more comments
I have a View in which I should be able to input doubles. The thing is, I can only input whole numbers such as "100" but not "100.4". All my background calculations run on doubles though.
I'm now trying to bypass the problem by implementing a StringToDoubleConverter but my C# knowledge is still very limited.
I've implemented this into my UserControl.Resources tag
<local:StringToDoubleConverter x:Key="StringToDouble"/>
and created a new class StringToDoubleConverter:
class StringToDoubleConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
string stringNumber = value as string;
double.TryParse(stringNumber, out double val);
return val;
}
}
Finally I've implemented the converter into my binding:
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource StringToDouble}}"/>
My DelayTime in my DelayModel looks like this:
private double _delayTime;
public double DelayTime
{
get
{
return _delayTime;
}
set
{
if (value != _delayTime)
{
_delayTime = value; NotifyPropertyChanged();
}
}
}
I know my converter is somehow wrong. I'm struggling to get the right code to convert the string I want to input in my View to doubles.
For example: I want to input "0.7" into my View and DelayTime should actually get "0.7" and not just the "7". Is TryParse oder double.Parse(value) correct?
c# string double ivalueconverter converters
asked Jan 3 at 12:10
jan97conjan97con
257
4
What culture is your PC set to? Does it use a period for decimal point?
– jdweng
Jan 3 at 12:13
I'm german. I want to use "." or "," for decimal points. Either one is fine. But right now I can't enter either of them. What I can do is: type: "1" then use the left arrow key and write a ".", the program will automatically put a 0 in front. It now shows "0.1" and it works. But thats not very intuitive...
– jan97con
Jan 3 at 12:17
1
your problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter.
– Stefan W.
Jan 3 at 12:26
One should work and the other fail. Not both fail. If you want bot the work then us TryParse and when one fails then use different culture and try second one. Or change period/comma to other one using string method.
– jdweng
Jan 3 at 12:31
1
You can try thisdecimal.TryParse(stringNumber, NumberStyles.Any, CultureInfo.InvariantCulture out decimal val).CultureInfo.InvariantCulturewill take care of the decimal character, whatever it is.
– ikerbera
Jan 3 at 12:53
|
show 4 more comments
I have a View in which I should be able to input doubles. The thing is, I can only input whole numbers such as "100" but not "100.4". All my background calculations run on doubles though.
I'm now trying to bypass the problem by implementing a StringToDoubleConverter but my C# knowledge is still very limited.
I've implemented this into my UserControl.Resources tag
<local:StringToDoubleConverter x:Key="StringToDouble"/>
and created a new class StringToDoubleConverter:
class StringToDoubleConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
string stringNumber = value as string;
double.TryParse(stringNumber, out double val);
return val;
}
}
Finally I've implemented the converter into my binding:
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource StringToDouble}}"/>
My DelayTime in my DelayModel looks like this:
private double _delayTime;
public double DelayTime
{
get
{
return _delayTime;
}
set
{
if (value != _delayTime)
{
_delayTime = value; NotifyPropertyChanged();
}
}
}
I know my converter is somehow wrong. I'm struggling to get the right code to convert the string I want to input in my View to doubles.
For example: I want to input "0.7" into my View and DelayTime should actually get "0.7" and not just the "7". Is TryParse oder double.Parse(value) correct?
c# string double ivalueconverter converters
asked Jan 3 at 12:10
jan97conjan97con
257
I have a View in which I should be able to input doubles. The thing is, I can only input whole numbers such as "100" but not "100.4". All my background calculations run on doubles though.
I'm now trying to bypass the problem by implementing a StringToDoubleConverter but my C# knowledge is still very limited.
I've implemented this into my UserControl.Resources tag
<local:StringToDoubleConverter x:Key="StringToDouble"/>
and created a new class StringToDoubleConverter:
class StringToDoubleConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
string stringNumber = value as string;
double.TryParse(stringNumber, out double val);
return val;
}
}
Finally I've implemented the converter into my binding:
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource StringToDouble}}"/>
My DelayTime in my DelayModel looks like this:
private double _delayTime;
public double DelayTime
{
get
{
return _delayTime;
}
set
{
if (value != _delayTime)
{
_delayTime = value; NotifyPropertyChanged();
}
}
}
I know my converter is somehow wrong. I'm struggling to get the right code to convert the string I want to input in my View to doubles.
For example: I want to input "0.7" into my View and DelayTime should actually get "0.7" and not just the "7". Is TryParse oder double.Parse(value) correct?
c# string double ivalueconverter converters
c# string double ivalueconverter converters
asked Jan 3 at 12:10
jan97conjan97con
257
asked Jan 3 at 12:10
jan97conjan97con
257
asked Jan 3 at 12:10
jan97conjan97con
257
asked Jan 3 at 12:10
jan97conjan97con
257
asked Jan 3 at 12:10
jan97conjan97con
257
257
4
What culture is your PC set to? Does it use a period for decimal point?
– jdweng
Jan 3 at 12:13
I'm german. I want to use "." or "," for decimal points. Either one is fine. But right now I can't enter either of them. What I can do is: type: "1" then use the left arrow key and write a ".", the program will automatically put a 0 in front. It now shows "0.1" and it works. But thats not very intuitive...
– jan97con
Jan 3 at 12:17
1
your problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter.
– Stefan W.
Jan 3 at 12:26
One should work and the other fail. Not both fail. If you want bot the work then us TryParse and when one fails then use different culture and try second one. Or change period/comma to other one using string method.
– jdweng
Jan 3 at 12:31
1
You can try thisdecimal.TryParse(stringNumber, NumberStyles.Any, CultureInfo.InvariantCulture out decimal val).CultureInfo.InvariantCulturewill take care of the decimal character, whatever it is.
– ikerbera
Jan 3 at 12:53
|
show 4 more comments
4
What culture is your PC set to? Does it use a period for decimal point?
– jdweng
Jan 3 at 12:13
I'm german. I want to use "." or "," for decimal points. Either one is fine. But right now I can't enter either of them. What I can do is: type: "1" then use the left arrow key and write a ".", the program will automatically put a 0 in front. It now shows "0.1" and it works. But thats not very intuitive...
– jan97con
Jan 3 at 12:17
1
your problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter.
– Stefan W.
Jan 3 at 12:26
One should work and the other fail. Not both fail. If you want bot the work then us TryParse and when one fails then use different culture and try second one. Or change period/comma to other one using string method.
– jdweng
Jan 3 at 12:31
1
You can try thisdecimal.TryParse(stringNumber, NumberStyles.Any, CultureInfo.InvariantCulture out decimal val).CultureInfo.InvariantCulturewill take care of the decimal character, whatever it is.
– ikerbera
Jan 3 at 12:53
4
4
What culture is your PC set to? Does it use a period for decimal point?
– jdweng
Jan 3 at 12:13
What culture is your PC set to? Does it use a period for decimal point?
– jdweng
Jan 3 at 12:13
I'm german. I want to use "." or "," for decimal points. Either one is fine. But right now I can't enter either of them. What I can do is: type: "1" then use the left arrow key and write a ".", the program will automatically put a 0 in front. It now shows "0.1" and it works. But thats not very intuitive...
– jan97con
Jan 3 at 12:17
I'm german. I want to use "." or "," for decimal points. Either one is fine. But right now I can't enter either of them. What I can do is: type: "1" then use the left arrow key and write a ".", the program will automatically put a 0 in front. It now shows "0.1" and it works. But thats not very intuitive...
– jan97con
Jan 3 at 12:17
1
1
your problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter.
– Stefan W.
Jan 3 at 12:26
your problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter.
– Stefan W.
Jan 3 at 12:26
One should work and the other fail. Not both fail. If you want bot the work then us TryParse and when one fails then use different culture and try second one. Or change period/comma to other one using string method.
– jdweng
Jan 3 at 12:31
One should work and the other fail. Not both fail. If you want bot the work then us TryParse and when one fails then use different culture and try second one. Or change period/comma to other one using string method.
– jdweng
Jan 3 at 12:31
1
1
You can try this
decimal.TryParse(stringNumber, NumberStyles.Any, CultureInfo.InvariantCulture out decimal val). CultureInfo.InvariantCulture will take care of the decimal character, whatever it is.– ikerbera
Jan 3 at 12:53
You can try this
decimal.TryParse(stringNumber, NumberStyles.Any, CultureInfo.InvariantCulture out decimal val). CultureInfo.InvariantCulture will take care of the decimal character, whatever it is.– ikerbera
Jan 3 at 12:53
|
show 4 more comments
1 Answer
1
active
oldest
votes
You don't need StringToDoubleConverter.
The problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter with KeyDown event
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime}" KeyDown="TextBox_KeyDown"/>
and code behind
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
(sender as TextBox).GetBindingExpression(TextBox.TextProperty).UpdateSource();
}
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
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oldest
votes
active
oldest
votes
You don't need StringToDoubleConverter.
The problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter with KeyDown event
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime}" KeyDown="TextBox_KeyDown"/>
and code behind
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
(sender as TextBox).GetBindingExpression(TextBox.TextProperty).UpdateSource();
}
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
add a comment |
You don't need StringToDoubleConverter.
The problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter with KeyDown event
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime}" KeyDown="TextBox_KeyDown"/>
and code behind
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
(sender as TextBox).GetBindingExpression(TextBox.TextProperty).UpdateSource();
}
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
add a comment |
You don't need StringToDoubleConverter.
The problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter with KeyDown event
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime}" KeyDown="TextBox_KeyDown"/>
and code behind
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
(sender as TextBox).GetBindingExpression(TextBox.TextProperty).UpdateSource();
}
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
You don't need StringToDoubleConverter.
The problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter with KeyDown event
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DelayModel.DelayTime}" KeyDown="TextBox_KeyDown"/>
and code behind
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
(sender as TextBox).GetBindingExpression(TextBox.TextProperty).UpdateSource();
}
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
answered Jan 3 at 13:46
Stefan W.Stefan W.
1869
1869
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
add a comment |
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
Thanks Stefan! The Key.Enter-Method was really helpful.
– jan97con
Jan 4 at 8:35
add a comment |
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4
What culture is your PC set to? Does it use a period for decimal point?
– jdweng
Jan 3 at 12:13
I'm german. I want to use "." or "," for decimal points. Either one is fine. But right now I can't enter either of them. What I can do is: type: "1" then use the left arrow key and write a ".", the program will automatically put a 0 in front. It now shows "0.1" and it works. But thats not very intuitive...
– jan97con
Jan 3 at 12:17
1
your problem is using UpdateSourceTrigger=PropertyChanged. It update the source after pressing each key. If you put the point character, it update the source with string value "0." what give you back "0" without point. You can change UpdateSourceTrigger to Default and update Source manually when you press Enter.
– Stefan W.
Jan 3 at 12:26
One should work and the other fail. Not both fail. If you want bot the work then us TryParse and when one fails then use different culture and try second one. Or change period/comma to other one using string method.
– jdweng
Jan 3 at 12:31
1
You can try this
decimal.TryParse(stringNumber, NumberStyles.Any, CultureInfo.InvariantCulture out decimal val).CultureInfo.InvariantCulturewill take care of the decimal character, whatever it is.– ikerbera
Jan 3 at 12:53