Issue with 2 way bounded Float with leading 0s after the decimal

Jim 21

<local:MoveEntry x:Name="tbQtyToMove" Grid.Row="2" Grid.Column="3" Text="{Binding Qty_To_Move, Mode=TwoWay }" Keyboard="Numeric" Focused="tbQtyToMove_GotFocus" Unfocused="tbQtyToMove_LostFocus" />

I have an Entry that is 2 way bounded to a Float. When the user tries to enter a value like 1.005, the second they enter the first zero the two way binding kicks in and makes the field 1, because 1.0 is updated back as 1. The user never gets the chance to enter the rest, 05. Is there a way to have the binding only happen when you leave the field and not on every key stroke?

JessieZhang-MSFT 7,701 Reputation points Microsoft Vendor

2020-12-10T07:20:49.473+00:00

Hi @Jim ,I used Entry to test, but I couldn't reproduce this problem as you mentioned. Maybe it is relative with your MoveEntry.

Could you please post the code of your MoveEntry?

Jim 21

Hi Jessie, I changed it to Entry and got the same issue. Are you updating the interface in the set of your property. Below is my code for the property.

 private float _Qty_To_Move = 0; 
 public float Qty_To_Move
 {
     get
     {
         return _Qty_To_Move;
     }
     set
     {
         _Qty_To_Move = value;
         OnPropertyChanged("Qty_To_Move");
     }
 }
 protected void OnPropertyChanged(string name)
 {
     PropertyChangedEventHandler handler = this.PropertyChanged;
     if (handler != null)
     {
         handler(this, new PropertyChangedEventArgs(name));
     }
 }

Accepted answer

John Hardman 261 Reputation points

2020-12-10T18:05:01.717+00:00

@Jim

Start by changing your setter:

set
{
if (Math.Abs(_Qty_To_Move - value) >= 0.001) // Some threshold value suitable for your scenario
{
_Qty_To_Move = value;
OnPropertyChanged("Qty_To_Move");
}
}

If that doesn't resolve it on its own (you should do that anyway), you might want to try specifying a string format or using a value converter. I think changing the setter should be enough.
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1 person found this answer helpful.
Jim 21 Reputation points

2020-12-10T23:31:52.95+00:00

That worked! Thank you, sir.

JessieZhang-MSFT 7,701 Reputation points Microsoft Vendor

2020-12-11T02:06:20.373+00:00

Hi @JimAccess, congrats, could you please mark the right relply as answered? Thanks in advance.
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Issue with 2 way bounded Float with leading 0s after the decimal

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