How to format number of decimal places in wpf using style template

Question

I am writing a WPF program and I am trying to figure out a way to format data in a TextBox through some repeatable method like a style or template  I have a lot of TextBoxes  95 to be exact  and each one is bound to its own numeric data which can each have their own resolution defined  For example if the data is 99 123 with a resolution of 2 then it should display 99 12  Similarly a data value of 99 and resolution 3 should be displayed as 99 000  not 99   Is there a way to do this   Edit  I should clarify  there are 95 TextBoxes on the current screen I m working on  but I want every TextBox throughout the various screens in my program to display the correct number of decimal places  Now that I think about it  some of these are TextBoxes  like the screen I m working on now  and some are DataGrids or ListViews  but if I can figure out how to get it working for TextBoxes I m sure I can figure it out for the other controls as well   There s not much code to share in this case but I ll attempt to make it clearer   I have a View Model which contains the following properties  vb net        Public ReadOnly Property Resolution As Integer         Get             Return  signal DisplayResolution         End Get     End Property      Public ReadOnly Property Value As Single         Get             Return Math Round  signal DisplayValue  Resolution          End Get     End Property   and in the XAML I have    lt UserControl Resources gt       lt vm SignalViewModel x Key  Signal  SignalPath  SomeSignal   gt   lt  UserControl Resources gt   lt TextBox Grid Column  3  IsEnabled  False  Text   Binding Path Value  Source  StaticResource Signal   Mode OneWay     gt    EDIT2  my solution   It turns out that after walking away from the computer for a while  I came back to find a simple answer that was staring me in the face  Format the data in the view model       Public ReadOnly Property Value As String         Get             Return  Strings FormatNumber Math Round  signal DisplayValue   signal DisplayResolution    signal DisplayResolution           End Get     End Property

User · Answer

The accepted answer does not show 0 in integer place on giving input like 0 299  It shows  3 in WPF UI  So my suggestion to use following string format   lt TextBox Text   Binding Value   StringFormat    0   0 0

User · Answer

void NumericTextBoxInput object sender  TextCompositionEventArgs e                TextBox txt    TextBox sender          var regex   new Regex     0-9        0-9  0 1                string str   txt Text   e Text ToString            int cntPrc   0          if  str Contains                             string   tokens   str Split                   if  tokens Count    gt  0                                string result   tokens 1                   char   prc   result ToCharArray                    cntPrc   prc Count                                    if  regex IsMatch e Text   amp  amp    e Text         amp  amp    TextBox sender  Text Contains e Text    amp  amp   cntPrc  lt  3                         e Handled   false                    else                       e Handled   true

User · Answer

You should use the StringFormat on the Binding  You can use either standard string formats  or custom string formats    lt TextBox Text   Binding Value  StringFormat N2     gt   lt TextBox Text   Binding Value  StringFormat    0     00      gt    Note that the StringFormat only works when the target property is of type string  If you are trying to set something like a Content property  typeof object    you will need to use a custom StringFormatConverter  like here   and pass your format string as the ConverterParameter   Edit for updated question  So  if your ViewModel defines the precision  I d recommend doing this as a MultiBinding  and creating your own IMultiValueConverter  This is pretty annoying in practice  to go from a simple binding to one that needs to be expanded out to a MultiBinding  but if the precision isn t known at compile time  this is pretty much all you can do  Your IMultiValueConverter would need to take the value  and the precision  and output the formatted string  You d be able to do this using String Format   However  for things like a ContentControl  you can much more easily do this with a Style    lt Style TargetType   x Type ContentControl   gt       lt Setter Property  ContentStringFormat               Value   Binding Resolution  StringFormat N 0      gt   lt  Style gt    Any control that exposes a ContentStringFormat can be used like this  Unfortunately  TextBox doesn t have anything like that

[wpf] How to format number of decimal places in wpf using style/template?

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