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--- swdev:dotnet:enum [2011/12/02 14:09]
smayr
+++ swdev:dotnet:enum [2011/12/02 14:11] (current)
smayr
@@ Line 74: / Line 74: @@
 </code>
+== Enumerate Enum for creating ListBox ==
+<code csharp>
+///----------------------------------------------------------------------------------------
+/// <summary>
+/// Enumerate enums to easily create a drop down list based on an enum.
+/// Source: http://blog.spontaneouspublicity.com/post/2008/01/17/Associating-Strings-with-enums-in-C.aspx
+///
+/// Example:
+/// DropDownList stateDropDown = new DropDownList();
+/// foreach (States state in EnumToList<States>())
+/// {
+///    stateDropDown.Items.Add(GetEnumDescription(state));
+/// }
+/// </summary>
+/// <typeparam name="T"></typeparam>
+/// <returns></returns>
+///----------------------------------------------------------------------------------------
+public static IEnumerable<T> EnumToList<T>()
+{
+    Type enumType = typeof(T);
+    // Can't use generic type constraints on value types,
+    // so have to do check like this
+    if (enumType.BaseType != typeof(Enum))
+    {
+        throw new ArgumentException("T must be of type System.Enum");
+    }
+    Array enumValArray  = Enum.GetValues(enumType);
+    List<T> enumValList = new List<T>(enumValArray.Length);
+    foreach (int val in enumValArray)
+    {
+        enumValList.Add((T)Enum.Parse(enumType, val.ToString()));
+    }
+    return enumValList;
+}
+</code>