C# 将文本框绑定到浮点值。无法输入点/逗号
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Bind textbox to float value. Unable to input dot / comma
提问by LukeSolar
When I try to input a DOT or a COMMA in a textbox, for example 1.02or 83,33the textbox prevents me to input such a value (and the input turns red). The textbox is bound to a float property. Why?
例如，当我尝试在文本框中输入 DOT 或逗号时，1.02或者83,33文本框阻止我输入这样的值（并且输入变为红色）。文本框绑定到浮动属性。为什么？
I have bound a textbox to a float Property Powerof a class implementing INotifyPropertyChanged.
我已将文本框绑定到Power实现INotifyPropertyChanged.
private float _power;
public float Power
{
get { return _power; }
set
{
_power = value;
OnPropertyChanged("Power");
}
}
In Xaml
在 Xml 中
<TextBox Name="txtPower" Height="23" TextWrapping="Wrap" Text="{Binding Path=Power, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
I have no custom validation at all right now.
我现在根本没有自定义验证。
Also tried decimal but it does not work either. For string everything works fine.
也试过十进制，但它也不起作用。对于字符串一切正常。
采纳答案by yonigozman
Try adding a StringFormat definition to the binding. Like so:
尝试向绑定添加 StringFormat 定义。像这样：
<TextBox Name="txtPower" Height="23"
TextWrapping="Wrap" Text="{Binding Path=Power, Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged,StringFormat=N2}"></TextBox>
回答by xmedeko
If you have .NET 4.5 or newer, you may enforce the pre 4.5 behaviour
如果您有 .NET 4.5 或更高版本，则可以强制执行 4.5 之前的行为
System.Windows.FrameworkCompatibilityPreferences.KeepTextBoxDisplaySynchronizedWithTextProperty = false;
See Sebastian Lux's blog:
With .NET 4.5 it is no longer possible to enter a separator character (comma or dot) with UpdateSourceTrigger = PropertyChangedby default. Microsoft says, this intended.
请参阅Sebastian Lux 的博客：在 .NET 4.5 中UpdateSourceTrigger = PropertyChanged，默认情况下不再可能输入分隔符（逗号或点）。微软表示，这是有意为之。
回答by Hisham
to fix dot and comma issue in textbox binding to decimal or float
修复文本框绑定到十进制或浮点数中的点和逗号问题
1- UpdateSourceTrigger = LostFocus
2- add string format StringFormat={}{0:#.##} to escape unneeded zeros
<TextBox Name="txtPower" Height="23"
TextWrapping="Wrap" Text="{Binding Path=Power, Mode=TwoWay,
UpdateSourceTrigger=LostFocus ,StringFormat={}{0:#.##}}"></TextBox>
