【自定义】建立自定义的数据驱动的本地化资源provider-数据驱动

欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【建立自定义的数据驱动的本地化资源provider】，下面是详细的讲解！

建立自定义的数据驱动的本地化资源provider

public class DbSimpleResourceProvider : IResourceProvider, IImplicitResourceProvider
{

private string _ResourceSetName;


private IDictionary _resourceCache;


private DbSimpleResourceProvider()
{ }


public DbSimpleResourceProvider(string virtualPath, string className)
{
_ResourceSetName=className;
}



private IDictionary GetResourceCache(string cultureName)
{
if (cultureName==null)
cultureName="";


if (this._resourceCache==null)
this._resourceCache=new ListDictionary();


IDictionary Resources=this._resourceCache[cultureName] as IDictionary;
if (Resources==null)
{
// *** DEPENDENCY HERE (#1): Using DbResourceDataManager to retrieve resources


// *** Use datamanager to retrieve the resource keys from the database
DbResourceDataManager Data=new DbResourceDataManager();
Resources=Data.GetResourceSet(cultureName as string, this._ResourceSetName);
this._resourceCache[cultureName]=Resources;
}


return Resources;
}



public void ClearResourceCache()
{
this._resourceCache.Clear();
}



object IResourceProvider.GetObject(string ResourceKey, CultureInfo Culture)
{
string CultureName=null;
if (Culture !=null)
CultureName=Culture.Name;
else
CultureName=CultureInfo.CurrentUICulture.Name;


return this.GetObjectInternal(ResourceKey, CultureName);
}



object GetObjectInternal(string ResourceKey, string CultureName)
{
IDictionary Resources=this.GetResourceCache(CultureName);

object value=null;
if (Resources==null)
value=null;
else
value=Resources[ResourceKey];

// *** If we're at a specific culture (en-Us) and there's no value fall back
// *** to the generic culture (en)
if (value==null && CultureName.Length > 3)
{
// *** try again with the 2 letter locale
return GetObjectInternal(ResourceKey,CultureName.Substring(0,2) );
}


// *** If the value is still null get the invariant value
if (value==null)
{
Resources=this.GetResourceCache("");
if (Resources==null)
value=null;
else
value=Resources[ResourceKey];
}


// *** If the value is still null and we're at the invariant culture
// *** let's add a marker that the value is missing
// *** this also allows the pre-compiler to work and never return null
if (value==null && string.IsNullOrEmpty(CultureName))
{
// *** No entry there
value="";


// *** DEPENDENCY HERE (#2): using DbResourceConfiguration and DbResourceDataManager to optionally
// add missing resource keys


// *** Add a key in the repository at least for the Invariant culture
// *** Something's referencing but nothing's there
if (DbResourceConfiguration.Current.AddMissingResources)
new DbResourceDataManager().AddResource(ResourceKey, value.ToString(), "", this._ResourceSetName);


}


return value;
}

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