将xml值映射到枚举类型

使用XmlEnum属性进行装饰：http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlenumattribute.aspx

public enum Fuel
{
    [XmlEnum("B")]
    Benzine,
    [XmlEnum("D")]
    Diesel,
    [XmlEnum("L")]
    LpgGas,
    [XmlEnum("3")]
    LpgG3,
    [XmlEnum("E")]
    Elektrisch,
    [XmlEnum("H")]
    Hybride,
    [XmlEnum("C")]
    Cryogeen,
    [XmlEnum("O")]
    Overig
}

您可以使用将xml属性值解析回枚举类型

var value = Enum.Parse(typeof(Fuel), "B");

但我认为你的"特殊"价值观（3、a/等）不会走得太远。为什么不将枚举定义为

enum Fuel
{
    Benzine,
    Diesel,
    // ...
    Three,
    ASlash,
    // ...
}

并编写一个静态方法将字符串转换为枚举成员？

为了实现这样的方法，您可以考虑将自定义属性添加到包含其字符串表示的枚举成员中——如果某个值在枚举中没有确切的对应值，请查找具有该属性的成员。

创建这样的属性很容易：

/// <summary>
/// Simple attribute class for storing String Values
/// </summary>
public class StringValueAttribute : Attribute
{
    public string Value { get; private set; }
    public StringValueAttribute(string value)
    {
        Value = value;
    }
}

然后你可以在你的枚举中使用它们：

enum Fuel
{
    [StringValue("B")]        
    Benzine,
    [StringValue("D")]
    Diesel,
    // ...
    [StringValue("3")]
    Three,
    [StringValue("/")]
    Slash,
    // ...
}

这两种方法将帮助您将字符串解析为您选择的枚举成员：

    /// <summary>
    /// Parses the supplied enum and string value to find an associated enum value (case sensitive).
    /// </summary>
    public static object Parse(Type type, string stringValue)
    {
        return Parse(type, stringValue, false);
    }
    /// <summary>
    /// Parses the supplied enum and string value to find an associated enum value.
    /// </summary>
    public static object Parse(Type type, string stringValue, bool ignoreCase)
    {
        object output = null;
        string enumStringValue = null;
        if (!type.IsEnum)
        {
            throw new ArgumentException(String.Format("Supplied type must be an Enum.  Type was {0}", type));
        }
        //Look for our string value associated with fields in this enum
        foreach (FieldInfo fi in type.GetFields())
        {
            //Check for our custom attribute
            var attrs = fi.GetCustomAttributes(typeof (StringValueAttribute), false) as StringValueAttribute[];
            if (attrs != null && attrs.Length > 0)
            {
                enumStringValue = attrs[0].Value;
            }                       
            //Check for equality then select actual enum value.
            if (string.Compare(enumStringValue, stringValue, ignoreCase) == 0)
            {
                output = Enum.Parse(type, fi.Name);
                break;
            }
        }
        return output;
    }

当我在做的时候：这是另一条路；）

    /// <summary>
    /// Gets a string value for a particular enum value.
    /// </summary>
    public static string GetStringValue(Enum value)
    {
        string output = null;
        Type type = value.GetType();
        if (StringValues.ContainsKey(value))
        {
            output = ((StringValueAttribute) StringValues[value]).Value;
        }
        else
        {
            //Look for our 'StringValueAttribute' in the field's custom attributes
            FieldInfo fi = type.GetField(value.ToString());
            var attributes = fi.GetCustomAttributes(typeof(StringValueAttribute), false);
            if (attributes.Length > 0)
            {
                var attribute = (StringValueAttribute) attributes[0];
                StringValues.Add(value, attribute);
                output = attribute.Value;
            }
        }
        return output;
    }

为什么不能解析字符串

[XmlAttribute("brandstof")]
public string FuelTypeString
{
    get { return fuel.ToString(); }
    set
    {
        fuel = (Fuel)System.Enum.Parse(typeof(Fuel), value);
    }
}
[XmlIgnore()]
public Fuel FuelType
{
    get { return fuel; }
    set { fuel = value; }
}

所以你真的把它序列化为一个字符串。

我创建了一个处理此问题的类：

    class EnumCreator
    {
        public static Type CreateEnum(List<string> AValues)
        {
            // Get the current application domain for the current thread.
            AppDomain currentDomain = AppDomain.CurrentDomain;
            // Create a dynamic assembly in the current application domain, 
            // and allow it to be executed and saved to disk.
            AssemblyName aName = new AssemblyName("TempAssembly");
            AssemblyBuilder ab = currentDomain.DefineDynamicAssembly(
                aName, AssemblyBuilderAccess.RunAndSave);
            // Define a dynamic module in "TempAssembly" assembly. For a single-
            // module assembly, the module has the same name as the assembly.
            ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, aName.Name + ".dll");      
            // Define a public enumeration with the name "Elevation" and an 
            // underlying type of Integer.
            EnumBuilder eb = mb.DefineEnum("EnumValues", TypeAttributes.Public, typeof(int));
            // Define two members, "High" and "Low".
            foreach (string v in AValues)
            {
                eb.DefineLiteral(v, AValues.IndexOf(v));
            }
            // Create the type and save the assembly.
            Type finished = eb.CreateType();
            return finished;
        }
    }

您必须首先读取xml文件并将值放在列表中，例如，您可以使用XElement对象来执行此操作。

//编辑：像这样：

XElement xml = XElement.parse("file.xml");
List<string> enumItems = new List<string>();
foreach(XElement row in   xml.Element("xsd:simpleType").Element("xsd:restriction").Elements())
{
  enumItems.Add(row.Attribute("value").Value);
}
Type Fuel = EnumCreator.CreatEnum(enumItems);