wpf WPF如何使用StringConverter将滑块的值绑定到标签的内容？
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WPF how to bind slider's value to label's content with StringConverter?
提问by iAteABug_And_iLiked_it
I have a simple sliderand a plain label. Label's content is bound to slider's value and it works fine- when you move the slider , label's content changes e.g 23.3983928394 , 50.234234234 and so on
我有一个简单的滑块和一个普通的label。标签的内容绑定到滑块的值并且它工作正常 - 当您移动滑块时，标签的内容会发生变化，例如 23.3983928394 、 50.234234234 等等
I'd like to round it to int values. 1,2,10....100. But when I try to use a converter I get the "ivalueconverter does not support converting from a string".
我想将其四舍五入为 int 值。1,2,10....100。但是当我尝试使用转换器时，我得到 “ivalueconverter 不支持从字符串转换”。
How can I convert the slider's Value to an int in the converter?
如何在转换器中将滑块的值转换为 int？
Thank you
谢谢
This is my XAML
这是我的 XAML
<Grid.Resources>
<local:MyConvertor x:Key="stringconverter" />
</Grid.Resources>
<Slider x:Name="mySlider" Height="50" Width="276" Maximum="100"/>
<Label Content="{Binding ElementName=mySlider, Path=Value, Converter=stringconverter}" />
This is my stringconverterclass
这是我的stringconverter课
public class MyConvertor: IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
//How to convert string to int?
}
采纳答案by LPL
To answer the question: the error is thrown because of
回答问题：抛出错误是因为
Converter=stringconverter
it has to be
它一定要是
Converter={StaticResource stringconverter}
In your converter you convert not string to int but double(Slider.Value) to object(Label.Content) which can be a string too. e.g.
在您的转换器中，您不是将 string 转换为 int，而是将double( Slider.Value) 转换为 object( Label.Content)，它也可以是字符串。例如
return ((double)value).ToString("0");
or
或者
return Math.Round((double)value);
回答by keyboardP
You could just use the StringFormatproperty here instead of creating a converter. The double value will be rounded to an int due to the #format specified.
您可以在此处使用StringFormat属性而不是创建转换器。由于#指定的格式，double 值将四舍五入为 int 。
<TextBlock Text="{Binding ElementName=mySlider, Path=Value, StringFormat={}{0:#}}"/>
If you want to keep the label, instead of using a TextBlock, you can use ContentStringFormatinstead as Contenttakes in an objecttype.
如果你想保留的，而不是使用一个TextBlock标签，你可以使用ContentStringFormat而不是作为Content发生在一个object类型。
<Label Content="{Binding ElementName=mySlider, Path=Value}" ContentStringFormat="{}{0:#}" />
回答by Erwin Draconis
you can use the Label's ContentStringFormat property
您可以使用标签的 ContentStringFormat 属性
<Label Content="{Binding ElementName=Slider, Path=Value}"
ContentStringFormat="{}{0:N0}" />
回答by ChuckMorris42
Check the Slider's IsSnapToTickEnabled property
检查 Slider 的 IsSnapToTickEnabled 属性
