我如何組合枚舉比較實際的枚舉

Question

傢伙loded組合框從枚舉

var values = from P_ProgramType.ReportType enumValue in Enum.GetValues(typeof(P_ProgramType.ReportType)) 
        select new KeyValuePair<P_ProgramType.ReportType, string>((enumValue), enumValue.ToString()); 
     reportTypeComboBox.DataSource = values.OrderByDescending(x => x.Value).ToList(); ; 
     reportTypeComboBox.DisplayMember = "Value"; 
     reportTypeComboBox.ValueMember = "Key"; 

現在我需要頂端檢查什麼值在每個選定的指標選擇做進一步的工作。 像

if ((P_ProgramType.ReportType)reportTypeComboBox.SelectedItem == P_ProgramType.ReportType.OVERALL) 
     { 
      lvlReportTypeNote.Text = "OVERALL : ALL (Including Secondary Loan) "; 
     } 

但上面的比較是不工作....需要一種方式來做到這一點？

Answer 1

假設你REPORTTYPE的類型爲int那麼：

if (Convert.ToInt32(reportTypeComboBox.SelectedItemValue) == (int)P_ProgramType.ReportType.OVERALL) 

還可以考慮讓自己的枚舉擴展方法，所以你可以很容易地填充下拉：

/// <summary> 
///  Represents the various forms of address 
/// </summary> 
public enum CarMake 
{ 
    [Description("Unknown")]Unknown = -1, 
    [Description("Ford Motor Company")] Ford = 1, 
    [Description("Nissan Japan")] Nissan = 2, 
} 

    /// <summary> 
    ///  Returns the value attribute content for an enum member. 
    /// </summary> 
    /// <param name="aEnumMember">Enumeration member to retrieve the description of.</param> 
    /// <returns>Returns the contents of the attribute or null if no attribute found</returns> 
    public static object GetValue(this Enum aEnumMember) 
    { 
     Value userValue = GetAttribute<Value>(aEnumMember); 
     return userValue != null ? userValue.Val : null; 
    } 

    /// <summary> 
    ///  Returns the description for an enumeration memnber. 
    /// </summary> 
    /// <param name="aEnumMember">Enumeration member to return the description of via the Description attribute.</param> 
    /// <returns> 
    ///  Returns the value of the description attribute if present otherwise the string representation of the enum 
    ///  member. 
    /// </returns> 
    /// <example>string text = CarMake.Ford.GetDescription();</example> 
    public static string GetDescription(this Enum aEnumMember) 
    { 
     Type type = aEnumMember.GetType(); 
     MemberInfo[] memberInfo = type.GetMember(aEnumMember.ToString()); 

     if (memberInfo.Length > 0) 
     { 
      object[] attributes = memberInfo[0].GetCustomAttributes(typeof (DescriptionAttribute), false); 

      if (attributes.Length > 0) 
      { 
       return ((DescriptionAttribute) attributes.First()).Description; 
      } 
     } 
     return aEnumMember.ToString(); 
    } 

     /// <summary> 
     ///  Constructs a select list where the item desription uses the Description attribute if specified for the member 
     ///  or else the name of the member, the value is either the ordinal position in the enum or if specified the Value 
     ///  attribute. 
     /// </summary> 
     /// <param name="aEnumeration">Enumeration to use.</param> 
     /// <param name="aSelectedValue">Selected value should the item be selected in the list.</param> 
     /// <param name="aIncludeDefaultItem">When true will include aDefaultItemText at the top of the list with a value of null.</param> 
     /// <param name="aDefaultItemText"></param> 
     /// <returns></returns> 
     /// <example>var carSelectList = new CarMake().ToSelectList(CarMake.Ford, true)</example> 
     public static SelectList ToSelectList(this Enum aEnumeration, object aSelectedValue = null, bool aIncludeDefaultItem = true, string aDefaultItemText = "(Select)") 
     { 
      List<SelectListQueryItem<object>> list = (from Enum e in Enum.GetValues(aEnumeration.GetType()) 
                 select new SelectListQueryItem<object> 
                 { 
                  Id = e.GetValue() == null ? Enum.Parse(aEnumeration.GetType(), Enum.GetName(aEnumeration.GetType(), e)) : e.GetValue(), 
                  Name = e.GetDescription() 
                 }).ToList(); 

      if (aIncludeDefaultItem) 
      { 
       list.Insert(0, new SelectListQueryItem<object> {Id = null, Name = aDefaultItemText}); 
      } 
      return new SelectList(list, "ID", "Name", aSelectedValue); 
     }