将枚举说明放在IEnumerable和组合框中

Question

我还是习惯了MVVM，所以如果有更好的方法可以让我知道。我必须坚持一定的做事方式，所以我在公司工作的所有东西都保持一定的标准。我试图用我的Enum类中的描述来填充组合框。我认为这是一件容易的事，但我不知道如何去做。任何帮助表示赞赏。如果您需要更多的代码或信息，请告诉我。代码如下。

我有我的描述在一个名为Enum.cs类：

[TypeConverter(typeof(EnumToStringUsingDescription))]  
    public enum ArTypes 
    { 
     [Description("(All)")] 
     arAll = 0, 
     [Description("Adjustment")] 
     [EnumInformation("Adjustment", true, 1)] 
     arAdjustment = 1, 
     [Description("Payment")] 
     [EnumInformation("Payment", true, 2)] 
     arPayment = 3, 
     [Description("Deposit Receipt")] 
     [EnumInformation("Deposit Receipt", true, 3)] 
     arDepositReceipt = 5, 
     [Description("Deposit Applied")] 
     [EnumInformation("Deposit Applied", true, 4)] 
     arDepositApplied = 7, 
     [Description("Bad Debt Transfer")] 
     [EnumInformation("Bad Debt Transfer", true, 5)] 
     arBadDebtTransfer = 9, 
     [Description("Bad Debt Writeoff")] 
     [EnumInformation("Bad Debt Writeoff", true, 6)] 
     arBadDebtWriteoff = 11, 
     [Description("Bad Debt Recovery")] 
     [EnumInformation("Bad Debt Recovery", true, 7)] 
     arBadDebtRecovery = 13, 
     [Description("Charge")] 
     [EnumInformation("Charge", true, 8)] 
     arCharge = 15, 
     [Description("Immediate Case Receipt")] 
     [EnumInformation("Immediate Cash Receipt", true, 9)] 
     arImmediateCashReceipt = 17, 
     [Description("Over Payment")] 
     [EnumInformation("Over Payment", true, 10)] 
     arOverPayment = 19, 
     [Description("Balance Forward")] 
     [EnumInformation("Balance Forward", true, 11)] 
     arBalanceForward = 21 
    } 

在我的视图模型我的代码，以填补我的组合框：

public IEnumerable<ArTypes> GetAllArTypesData() 
     { 
      try 
      { 
       //I believe the logic for setting the Ienumberable would go here 


      } 
      catch (Exception ex) 
      { 
       LogException(ex); 
      } 
      return null; 
     } 

要填充我运行这个组合框：

void PopulateComboLists() 
     { 
      CycleList = new ObservableCollection<Cycle>(); 
      ServiceTypeList = new ObservableCollection<ServiceType>(); 
      RateList = new ObservableCollection<Rate>(); 
      CustomerTypeList = new ObservableCollection<CustomerType>(); 
      ArCodeList = new ObservableCollection<Arcode>(); 
      ArTypeList = new ObservableCollection<ArTypes>(); 

      CycleList.Add(new Cycle() { CycleID = -1, CycleDescription = "(All)" }); 
      ServiceTypeList.Add(new ServiceType() { ServiceTypeID = -1, ServiceDescription = "(All)" }); 
      CustomerTypeList.Add(new CustomerType() { CustomerTypeID = -1, Description = "(All)" }); 
      ArCodeList.Add(new Arcode() { ArcodeID = -1, Description = "(All)" }); 

      foreach (var item in cycles) 
      { 
       CycleList.Add(item); 
      } 

      foreach (var item in serviceTypes) 
      { 
       ServiceTypeList.Add(item); 
      } 

      foreach (var item in rates) 
      { 
       RateList.Add(item); 
      } 

      foreach (var item in custTypes) 
      { 
       CustomerTypeList.Add(item); 
      } 

      foreach (var item in arCodes) 
      { 
       ArCodeList.Add(item); 
      } 

      foreach (var item in arTypes) 
      { 
       ArTypeList.Add(item); 
      } 
     } 

下面是其中数据被加载到用户界面：

protected override void LoadDataStart() 
     { 
      //*Insert IsBusy and any other logic needed before database calls*// 
      this.IsBusy = true; 
      this.BusyMessage = "Generating Widget..."; 

      try 
      { 
       //*Create a method for each database call - start a new task for each*// 
       var taskCTR = Task.Factory.StartNew(() => GetAllCustomerTypeReportsData()).ContinueWith(results => GetAllCustomerTypeReportsDataContinue(results.Result)); 
       var taskST = Task.Factory.StartNew(() => GetAllServiceTypesData()).ContinueWith(results => GetAllServiceTypesDataContinue(results.Result)); 
       var taskRL = Task.Factory.StartNew(() => GetAllRatesData()).ContinueWith(results => GetAllRatesDataContinue(results.Result)); 
       var taskCL = Task.Factory.StartNew(() => GetAllCyclesData()).ContinueWith(results => GetAllCyclesDataContinue(results.Result)); 
       var taskCT = Task.Factory.StartNew(() => GetAllCustomerTypesData()).ContinueWith(results => GetAllCustomerTypesDataContinue(results.Result)); 
       var taskAC = Task.Factory.StartNew(() => GetAllArCodesData()).ContinueWith(results => GetAllArCodesDataContinue(results.Result)); 
       var taskAT = Task.Factory.StartNew(() => GetAllArTypesData()).ContinueWith(results => GetAllArTypesDataContinue(results.Result)); 

       Task[] allTasks = new Task[7] { taskCTR, taskST, taskRL, taskCL, taskCT, taskAC, taskAT }; 

       Task.Factory.ContinueWhenAll(allTasks, loadDataContinue => 
       { 
        Action executeContinue =() => 
        { 
         PopulateComboLists(); 

         if (CanLoad) 
         { 
          LoadDataContinue(); 
          IsBusy = false; 
         } 
         else 
          ShowOptionsView(); 
        }; 
        this.UIDispatcher.Invoke(executeContinue); 
       }); 
      } 
      catch (Exception ex) 
      { 
       LogException(ex); 
      } 

      //*Base class will call LoadDataContinue() once the database calls are complete*// 
     } 

XAML：

<Label VerticalAlignment="Center" Margin="5,0,0,0" Content="ArType: " Grid.Row="5" Grid.Column="0"></Label> 
     <telerik:RadComboBox ItemsSource="{Binding ArTypeList}" 
          DisplayMemberPath="Key" 
          SelectedValuePath="Value" 
          HorizontalAlignment="Left" Width="190" 
          SelectedValue="{Binding Path=SelectedArType, Mode=TwoWay, ValidatesOnDataErrors=True}" 
          TabIndex="5" Grid.Row="5" VerticalAlignment="Center" Grid.Column="1" 
          Style="{StaticResource RadComboBoxStyle}" /> 

Answer 1

如果你问如何收集每个enum例如从DescriptionAttribute的值，你可以做这样的事情：

ObservableCollection descriptions = new ObservableCollection(); 
foreach (object instance in Enum.GetValues(typeof(ArTypes))) 
{ 
    FieldInfo fieldInfo = typeof(ArTypes).GetField(instance.ToString()); 
    object[] customAttributes = 
     fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false); 
    if (customAttributes != null && customAttributes.Length > 0) 
     descriptions.Add(((DescriptionAttribute)customAttributes[0]).Description); 
} 

有可能在那里有一个错误，因为我目前无法测试，所以请告诉我是否有错误。

Answer 2

这可以通过使用comboBox的转换器和项目模板来完成。

这里是当绑定到一个枚举将返回描述值转换器代码：

namespace Focal.FirmwareUpdate.UI.WPF.Common.Converters 
{ 
    public class EnumDescriptionConverter : IValueConverter 
    { 
     private string GetEnumDescription(Enum enumObj) 
     { 
      FieldInfo fieldInfo = enumObj.GetType().GetField(enumObj.ToString()); 

      object[] attribArray = fieldInfo.GetCustomAttributes(false); 

      if (attribArray.Length == 0) 
      { 
       return enumObj.ToString(); 
      } 
      else 
      { 
       DescriptionAttribute attrib = attribArray[0] as DescriptionAttribute; 
       return attrib.Description; 
      } 
     } 

     object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture) 
     { 
      Enum myEnum = (Enum)value; 
      string description = GetEnumDescription(myEnum); 
      return description; 
     } 

     object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
     { 
      return string.Empty; 
     } 
    } 

然后在你的XAML你需要使用和项目模板。

<ComboBox Grid.Row="1" Grid.Column="1" Height="25" Width="100" Margin="5" 
        ItemsSource="{Binding Path=MyEnums}" 
        SelectedItem="{Binding Path=MySelectedItem}" 
        > 
      <ComboBox.ItemTemplate> 
       <DataTemplate> 
        <TextBlock Text="{Binding Converter={StaticResource enumDescriptionConverter}}"/> 
       </DataTemplate> 
      </ComboBox.ItemTemplate> 
     </ComboBox>