NopCommerce多语言的实现

通过语言包xml文件导入导出语言字符串

数据库方面，以下数据表：

Language

LocaleStringResource

LocalizedProperty

接口IWorkContext真正实现类是Nop.Web.Framework.WebWorkContext，里面有一个获取语言的属性。

1. public virtual Language WorkingLanguage
2. {
3. get
4. {
5. if (_cachedLanguage != null)
6. return _cachedLanguage;
8. Language detectedLanguage = null;
9. if (_localizationSettings.SeoFriendlyUrlsForLanguagesEnabled)
10. {
11. //从URL中获取语言
12. detectedLanguage = GetLanguageFromUrl();
13. }
14. if (detectedLanguage == null && _localizationSettings.AutomaticallyDetectLanguage)
15. {
16. //get language from browser settings
17. //but we do it only once
18. if (!this.CurrentCustomer.GetAttribute<bool>(SystemCustomerAttributeNames.LanguageAutomaticallyDetected,
19. _genericAttributeService, _storeContext.CurrentStore.Id))
20. {
21. detectedLanguage = GetLanguageFromBrowserSettings();
22. if (detectedLanguage != null)
23. {
24. _genericAttributeService.SaveAttribute(this.CurrentCustomer, SystemCustomerAttributeNames.LanguageAutomaticallyDetected,
25. true, _storeContext.CurrentStore.Id);
26. }
27. }
28. }
29. if (detectedLanguage != null)
30. {
31. //the language is detected. now we need to save it
32. if (this.CurrentCustomer.GetAttribute<int>(SystemCustomerAttributeNames.LanguageId,
33. _genericAttributeService, _storeContext.CurrentStore.Id) != detectedLanguage.Id)
34. {
35. _genericAttributeService.SaveAttribute(this.CurrentCustomer, SystemCustomerAttributeNames.LanguageId,
36. detectedLanguage.Id, _storeContext.CurrentStore.Id);
37. }
38. }
40. var allLanguages = _languageService.GetAllLanguages(storeId: _storeContext.CurrentStore.Id);
41. //find current customer language
42. var languageId = this.CurrentCustomer.GetAttribute<int>(SystemCustomerAttributeNames.LanguageId,
43. _genericAttributeService, _storeContext.CurrentStore.Id);
44. var language = allLanguages.FirstOrDefault(x => x.Id == languageId);
45. if (language == null)
46. {
47. //如果没有指定语言，默认返回系统中的第一种语言
48. language = allLanguages.FirstOrDefault();
49. }
50. if (language == null)
51. {
52. //it not specified, then return the first found one
53. language = _languageService.GetAllLanguages().FirstOrDefault();
54. }
56. //cache
57. _cachedLanguage = language;
58. return _cachedLanguage;
59. }
60. set
61. {
62. var languageId = value != null ? value.Id : 0;
63. _genericAttributeService.SaveAttribute(this.CurrentCustomer,
64. SystemCustomerAttributeNames.LanguageId,
65. languageId, _storeContext.CurrentStore.Id);
67. //reset cache
68. _cachedLanguage = null;
69. }
70. }

1. string result = string.Empty;
2. if (resourceKey == null)
3. resourceKey = string.Empty;
4. resourceKey = resourceKey.Trim().ToLowerInvariant();
5. if (_localizationSettings.LoadAllLocaleRecordsOnStartup)
6. {
7. //load all records (we know they are cached)
8. var resources = GetAllResourceValues(languageId);
9. if (resources.ContainsKey(resourceKey))
10. {
11. result = resources[resourceKey].Value;
12. }
13. }
14. else
15. {
16. //gradual loading
17. string key = string.Format(LOCALSTRINGRESOURCES_BY_RESOURCENAME_KEY, languageId, resourceKey);
18. string lsr = _cacheManager.Get(key, () =>
19. {
20. var query = from l in _lsrRepository.Table
21. where l.ResourceName == resourceKey
22. && l.LanguageId == languageId
23. select l.ResourceValue;
24. return query.FirstOrDefault();
25. });
27. if (lsr != null)
28. result = lsr;
29. }
30. if (String.IsNullOrEmpty(result))
31. {
32. if (logIfNotFound)
33. _logger.Warning(string.Format("Resource string ({0}) is not found. Language ID = {1}", resourceKey, languageId));
35. if (!String.IsNullOrEmpty(defaultValue))
36. {
37. result = defaultValue;
38. }
39. else
40. {
41. if (!returnEmptyIfNotFound)
42. result = resourceKey;
43. }
44. }
45. return result;
46. }

1. public virtual string GetResource(string resourceKey)
2. {
3. if (_workContext.WorkingLanguage != null)
4. return GetResource(resourceKey, _workContext.WorkingLanguage.Id);
6. return "";
7. }

接下来我们来通过一个验证提示信息类BlogPostValidator来看看这个多语言是怎么实现的?

BlogPostValidator.cs：

1. public class BlogPostValidator : AbstractValidator<BlogPostModel>
2. {
3. public BlogPostValidator(ILocalizationService localizationService)
4. {
5. RuleFor(x => x.Title)
6. .NotEmpty()
7. .WithMessage(localizationService.GetResource("Admin.ContentManagement.Blog.BlogPosts.Fields.Title.Required"));
9. RuleFor(x => x.Body)
10. .NotEmpty()
11. .WithMessage(localizationService.GetResource("Admin.ContentManagement.Blog.BlogPosts.Fields.Body.Required"));
12. }
13. }