为什么不两全其美呢?
有一个 CustomResourceManager 来处理资源加载并选择正确的区域性,并使用 CustomResourceReader 来使用您喜欢的任何后备存储。基本实现可能如下所示,依赖于 Resourceky 的约定,即 Typename_PropertyName_PropertyValue。如果由于某种原因需要更改后备存储的结构(csv/excel/mssql/表结构),您只需更改 ResourceReader 的实现即可。
作为额外的奖励,我还得到了真实/透明的代理。
资源管理器
class MyRM:ResourceManager
{
readonly Dictionary<CultureInfo, ResourceSet> sets = new Dictionary<CultureInfo, ResourceSet>();
public void UnCache(CultureInfo ci)
{
sets.Remove(ci):
}
protected override ResourceSet InternalGetResourceSet(CultureInfo culture, bool createIfNotExists, bool tryParents)
{
ResourceSet set;
if (!sets.TryGetValue(culture, out set))
{
IResourceReader rdr = new MyRR(culture);
set = new ResourceSet(rdr);
sets.Add(culture,set);
}
return set;
}
// sets Localized values on properties
public T GetEntity<T>(T obj)
{
var entityType = typeof(T);
foreach (var prop in entityType.GetProperties(
BindingFlags.Instance
| BindingFlags.Public)
.Where(p => p.PropertyType == typeof(string)
&& p.CanWrite
&& p.CanRead))
{
// FooEntity_Name_(content of Name field)
var key = String.Format("{0}_{1}_{2}",
entityType.Name,
prop.Name,
prop.GetValue(obj,null));
var val = GetString(key);
// only set if a value was found
if (!String.IsNullOrEmpty(val))
{
prop.SetValue(obj, val, null);
}
}
return obj;
}
}
资源阅读器
class MyRR:IResourceReader
{
private readonly Dictionary<string, string> _dict;
public MyRR(CultureInfo ci)
{
_dict = new Dictionary<string, string>();
// get from some storage (here a hardcoded Dictionary)
// You have to be able to deliver a IDictionaryEnumerator
switch (ci.Name)
{
case "nl-NL":
_dict.Add("FooEntity_Name_Dutch", "nederlands");
_dict.Add("FooEntity_Name_German", "duits");
break;
case "en-US":
_dict.Add("FooEntity_Name_Dutch", "The Netherlands");
break;
case "en":
_dict.Add("FooEntity_Name_Dutch", "undutchables");
_dict.Add("FooEntity_Name_German", "german");
break;
case "": // invariant
_dict.Add("FooEntity_Name_Dutch", "dutch");
_dict.Add("FooEntity_Name_German", "german?");
break;
default:
Trace.WriteLine(ci.Name+" has no resources");
break;
}
}
public System.Collections.IDictionaryEnumerator GetEnumerator()
{
return _dict.GetEnumerator();
}
// left out not implemented interface members
}
Usage
var rm = new MyRM();
var f = new FooEntity();
f.Name = "Dutch";
var fl = rm.GetEntity(f);
Console.WriteLine(f.Name);
Thread.CurrentThread.CurrentUICulture = new CultureInfo("nl-NL");
f.Name = "Dutch";
var dl = rm.GetEntity(f);
Console.WriteLine(f.Name);
真实代理
public class Localizer<T>: RealProxy
{
MyRM rm = new MyRM();
private T obj;
public Localizer(T o)
: base(typeof(T))
{
obj = o;
}
public override IMessage Invoke(IMessage msg)
{
var meth = msg.Properties["__MethodName"].ToString();
var bf = BindingFlags.Public | BindingFlags.Instance ;
if (meth.StartsWith("set_"))
{
meth = meth.Substring(4);
bf |= BindingFlags.SetProperty;
}
if (meth.StartsWith("get_"))
{
// get the value...
meth = meth.Substring(4);
var key = String.Format("{0}_{1}_{2}",
typeof (T).Name,
meth,
typeof (T).GetProperty(meth, BindingFlags.Public | BindingFlags.Instance
|BindingFlags.GetProperty).
GetValue(obj, null));
// but use it for a localized lookup (rm is the ResourceManager)
var val = rm.GetString(key);
// return the localized value
return new ReturnMessage(val, null, 0, null, null);
}
var args = new object[0];
if (msg.Properties["__Args"] != null)
{
args = (object[]) msg.Properties["__Args"];
}
var res = typeof (T).InvokeMember(meth,
bf
, null, obj, args);
return new ReturnMessage(res, null, 0, null, null);
}
}
真实/透明代理使用
var f = new FooEntity();
f.Name = "Dutch";
var l = new Localizer<FooEntity>(f);
var fp = (FooEntity) l.GetTransparentProxy();
fp.Name = "Dutch"; // notice you can use the proxy as is,
// it updates the actual FooEntity
var localizedValue = fp.Name;