如何在wpf中从combobox中选择不同的文化时更改datepicker中的日期 [英] how to change date in datepicker when selecting different cultures from combobox in wpf

问题描述

我在combobox中创建了一个国家/地区列表，我有datepicker。当用户选择一个国家时，日期必须根据该国家文化格式进行更改。请帮助我

  public  List< string> getCountryList（）
 {
 
 CultureInfo [] cultures = CultureInfo.GetCultures（CultureTypes.AllCultures& ~HeultureTypes.NeutralCultures& ~HeultureTypes.InstalledWin32Cultures）; 
  foreach （CultureInfo culture 在文化中）
 {
 
 尝试 
 {
 RegionInfo region =  new  RegionInfo（culture.Name） ; 
 
  if （！（cultureList.Contains（region.EnglishName）））
 {
 cultureList.Add（region 。英文名）; 
 abbrevationtext.Add（  en  -  + region.TwoLetterISORegionName.ToLower（））; 
 
} 
} 
 
  catch （例外情况）
 {
  throw  ex; 
} 
 
} 
 cultureList.Sort（）; 
 
  return  cultureList; 
 
 
} 

我的xaml如下

 <  标签   内容  =  CountryName    Horizo​​ntalAlignment   =  Left    VerticalAlignment   =  Top     背景  = ＃FFBB4040   宽度  =  110   高度  =  25  /  >  
 
 <   combobox     horizo​​ntalalignment   = 左    itemssource   =  {Binding CountryList}    selecteditem   =  {Binding CountryName，Mode = TwoWay} < span class =code-attribute>   verticalalignment   = 顶部    width   =  120    height   =  25    iseditable   =  False    /  >  
 
 <  标签   内容  =  AppointmentDate    Horizo​​nta lAlignment   = 左    VerticalAlignment   =  Top     背景  = ＃FFBB4040   宽度  =  120   < span class =code-attribute>高度  =  25  /  >  
 
 <   datepicker     x ：name   =  dtpAppointment Horizo​​ntalAlignment =    left   =  Text =    verticalalignment   =  Top    height   =  25    xmlns： x   = ＃unknown    /  >  

我有添加按钮，这里使用MVVM模式

解决方案

您可以通过内嵌或在页面资源或app.xaml中的资源中指定默认样式来覆盖datepicker控件的样式。样式可能类似于：

 <  样式    targettype   =  {x：输入DatePickerTextBox} >  
 <   setter    属性  =  Control.Template >  
 <   setter.value  >  
 <   controltemplate  >  
 <  < span class =code-leadattribute> textbox     x：name   =  PART_TextBox    xmlns：x   = ＃unknown >  
 Text ={Binding Path = SelectedDate，
 Converter = {StaticResource localizationConverter}}，
 ConverterParameter = {Binding CountryName}，
 RelativeSource = { RelativeSource AncestorType = {x：Type DatePicker}}}/> 
 <   / textbox  >  <   / controltemplate  >  
 <   / setter.value  >  
 <   / setter   >  
 <   / style  >  

您也可以将国家/地区名称指定为动态资源，并在飞。这里的关键是您将国家/地区名称转换为可以为您更改文本表示的值转换器。转换器应该相对简单。转换方法的主体应该是：

  return  字符串 .Format（culture，  {0：D}，值）; 

您将文化转换为正确的文化对象转换器参数。



或者，我认为更好，就是切换到WPF Toolkit中的DateTimePicker控件。它有一个Format属性，你设置为'Custom'，然后是一个FormatString属性，你可以绑定到视图模型上的东西。当用户从组合框中选择国家/地区时，在CountryName的属性设置中，为选择器控件设置适当的格式字符串。应该那么干净。

hi,
I have created a country list in combobox and i have datepicker.when an user select a country the date have to change withrespect to that country culture format.please help me

public List<string> getCountryList()
        {
           
            CultureInfo[] cultures = CultureInfo.GetCultures(CultureTypes.AllCultures & ~CultureTypes.NeutralCultures & ~CultureTypes.InstalledWin32Cultures);
            foreach (CultureInfo culture in cultures)
            {

                try
                {
                    RegionInfo region = new RegionInfo(culture.Name);

                    if (!(cultureList.Contains(region.EnglishName)))
                    {
                        cultureList.Add(region.EnglishName);
                        abbrevationtext.Add("en-" + region.TwoLetterISORegionName.ToLower());
                    
                    }
                }
                    
                catch (Exception ex)
                {
                    throw ex;
                }

            }
            cultureList.Sort();
            
            return cultureList;
            

        }  

and i have xaml as below

<Label Content="CountryName" HorizontalAlignment="Left" VerticalAlignment="Top"  Background="#FFBB4040" Width="110" Height="25"/>
        
<combobox horizontalalignment="Left" itemssource="{Binding CountryList}" selecteditem="{Binding CountryName,Mode=TwoWay}" verticalalignment="Top" width="120" height="25" iseditable="False" /> 
           
<Label Content="AppointmentDate" HorizontalAlignment="Left" VerticalAlignment="Top"  Background="#FFBB4040" Width="120" Height="25"/>

<datepicker x:name="dtpAppointment HorizontalAlignment=" left=" Text=" verticalalignment="Top" height="25" xmlns:x="#unknown" />

and i have Add button and here im using MVVM pattern

解决方案

You can override the style of the datepicker control by either in-lining it or specifying a default style in the page resources or in the resources in app.xaml. The style might look something like:

<style targettype="{x:Type DatePickerTextBox}">
 <setter property="Control.Template">
  <setter.value>
   <controltemplate>
    <textbox x:name="PART_TextBox" xmlns:x="#unknown">
     Text="{Binding Path=SelectedDate,
     Converter={StaticResource localizationConverter}},
     ConverterParameter={Binding CountryName},
     RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
   </textbox></controltemplate>
  </setter.value>
 </setter>
</style>

You might also be able to specify the country name as a dynamic resource and change it on the fly. The key here is that you get the country name into a value converter that can change the text representation for you. The converter should be relatively straightforward. The body of the convert method should just be:

return String.Format(culture, "{0:D}", value);

where you have cast culture to the correct culture object as passed via the converter parameter.

Alternately, and I think better, would be to switch to the DateTimePicker control that is in the WPF Toolkit. It has a Format property you set to 'Custom' then a FormatString property you can bind to something on your view model. When the user selects a country from the combobox, in the property setting for CountryName, set the appropriate format string for the picker control. Should be much cleaner that way.

这篇关于如何在wpf中从combobox中选择不同的文化时更改datepicker中的日期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！