在设置中存储单选按钮选择 [英] Storing a radio button selection in the settings

问题描述

我一直在看这篇文章，但是我在设置中保存枚举值有问题。

I've been looking at this article but am having issues saving the enumerated value in the settings.

我创建了以下枚举：

public enum FType
{
    None,
    Delimited,
    FixedWidth,
    XML
};

我的单选按钮选择工作得很好，但我现在想在设置中存储所选项，似乎没有存储枚举变量的能力。

I have the radio button selection working nicely but I now want to store the selected option in the settings but there doesn't appear to be the ability to store an enumerated variable.

我假设我可以将枚举转换为字符串，然后转换回来，但是有点noob当涉及到WPF我不是真的确定从哪里开始。

I assumed I could convert the enum to a string and then convert back but being a bit of a noob when it comes to WPF I'm not realy sure where to start.

这是迄今为止生成的代码：

Here is the code I've generated so far:

App.Xaml

<Application x:Class="Widget.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:properties="clr-namespace:Widget.Properties"
    StartupUri="Window1.xaml"
    Exit="Application_Exit">
    <Application.Resources>
        <properties:Settings x:Key="Settings" />
    </Application.Resources>
</Application>

App.xaml.cs

App.xaml.cs

public partial class App : Application
{
    private void Application_Exit(object sender, ExitEventArgs e)
    {
        Widget.Properties.Settings.Default.Save();
    }
}

Windows.xaml

Windows.xaml

<Window x:Class="Widget.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:Widget"
    Title="Window1" Height="85" Width="300">
    <Window.Resources>
        <local:EnumBooleanConverter x:Key="enumBooleanConverter"/>
    </Window.Resources>
    <Grid>
        <StackPanel>
            <RadioButton GroupName="FileType" Content="Delimited"   IsChecked="{Binding Path=Default.FileType, Mode=TwoWay, Converter={StaticResource enumBooleanConverter}, ConverterParameter=Delimited}" />
            <RadioButton GroupName="FileType" Content="Fixed Width" IsChecked="{Binding Path=Default.FileType, Mode=TwoWay, Converter={StaticResource enumBooleanConverter}, ConverterParameter=FixedWidth}"/>
            <RadioButton GroupName="FileType" Content="XML"         IsChecked="{Binding Path=Default.FileType, Mode=TwoWay, Converter={StaticResource enumBooleanConverter}, ConverterParameter=XML}"/>
        </StackPanel>
    </Grid>
</Window>

Converter.cs

Converter.cs

    public class EnumBooleanConverter : IValueConverter
    {
        public EnumBooleanConverter()
        {
        }

        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string parameterString = parameter as string;
            if (parameterString == null)
                return DependencyProperty.UnsetValue;

            if (Enum.IsDefined(value.GetType(), value) == false)
                return DependencyProperty.UnsetValue;

            object parameterValue = Enum.Parse(value.GetType(), parameterString);

            return parameterValue.Equals(value);
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string parameterString = parameter as string;
            if (parameterString == null)
                return DependencyProperty.UnsetValue;

            return Enum.Parse(targetType, parameterString);
        }
        #endregion
     }

推荐答案

您的代码看起来很好，除了我认为可能阻止您存储设置的两个问题：

Your code looks just fine, except 2 problems that I think may be preventing you from storing settings:

• 我想你应该为 RadioButton 指定一个 DataContext 。只需修改您的Window1，就像这样：

• I think you should specify a DataContext for your RadioButtons. Just modify your Window1 like this:

<StackPanel DataContext="{StaticResource Settings}">
    <RadioButton GroupName=... />
    <RadioButton GroupName=... />
    <RadioButton GroupName=... />
</StackPanel>

（注意：如果 StaticResource 工作尝试使用 DynamicResource ）

(Note: If StaticResource doesn't work try using DynamicResource)

其次，从你的帖子看来，你正在将值存储为 string 在设置中。只需更改此值，而将 FileType 的数据类型设置为 Ftype 。 （如果你不知道2怎么做，请告诉我）

Secondly, from your post it seems that you are storing values as string in settings. Just change this and instead set datatype of FileType to Ftype. (If you don't know how 2 do this, tell me)

肯定得到这个工作！我希望;）

After doing these 2 changes you'll surely get this working! I hope ;)

这篇关于在设置中存储单选按钮选择的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！