学习Net Core 2.0 做博客 操作json文件读写

{ ?"BlogSettings": { ???"Title": "xxx博客", ???"Subtitle": "随便写点什么", ???"Url": "http://www.baidu.com", ???"Logo": "/upload/Pictures/global/Logo_40.PNG", ???"Abstract": "<b>随便写点什么！！！</b>", ???"LogoText": "XXXXBlog", ???"Keywords": ".NET,哈哈哈", ???"Description": ".NET,哈哈哈", ???"Statistics": null, ???"Footer": "", ???"QQAppId": null, ???"QQAppKey": null ?}}

 ??/// <summary> ???/// 博客设置 ???/// </summary> ???public class BlogSettingsViewModel ???{ ???????/// <summary> ???????/// 网站标题 ???????/// </summary> ???????public string Title { get; set; } ???????/// <summary> ???????/// 副标题 ???????/// </summary> ???????public string Subtitle { get; set; } ???????/// <summary> ???????/// 网站链接 ???????/// </summary> ???????public string Url { get; set; } ???????/// <summary> ???????/// 网站logo ???????/// </summary> ???????public string Logo { get; set; } ???????/// <summary> ???????/// 简介 ???????/// </summary> ???????public string Abstract { get; set; } ???????/// <summary> ???????/// 网站首页显示logo ???????/// </summary> ???????public string LogoText { get; set; } ???????/// <summary> ???????/// 网站关键词 ???????/// </summary> ???????public string Keywords { get; set; } ???????/// <summary> ???????/// 网站描述 ???????/// </summary> ???????public string Description { get; set; } ???????/// <summary> ???????/// 第三方统计代码 ???????/// </summary> ???????public string Statistics { get; set; } ???????/// <summary> ???????/// 页脚 ???????/// </summary> ???????public string Footer { get; set; } ???????/// <summary> ???????/// qq登陆Id ???????/// </summary> ???????public string QQAppId { get; set; } ???????/// <summary> ???????/// qq登陆key ???????/// </summary> ???????public string QQAppKey { get; set; } ???}

 //绑定博客设置json节点 services.ConfigureWritable<BlogSettingsViewModel>(Configuration.GetSection("BlogSettings"), "appsettings.custom.json");

WebHost.CreateDefaultBuilder(args)
??????????????.ConfigureAppConfiguration(config => config.AddJsonFile("appsettings.custom.json", optional: true, reloadOnChange: true))
???????????????.UseStartup<Startup>()
???????????????.Build();

 public interface IWritableOptions<T> : IOptionsSnapshot<T> where T : class, new() ???{ ???????????????void Update(Action<T> applyChanges); ???????????}

 public class WritableOptions<T> : IWritableOptions<T> where T : class, new() ???{ ???????????private readonly IHostingEnvironment _environment; ???????private readonly IOptionsMonitor<T> _options; ???????private readonly string _section; ???????private readonly string _file; ???????????????public WritableOptions( ???????????IHostingEnvironment environment, ???????????IOptionsMonitor<T> options, ???????????string section, ???????????string file) ???????{ ???????????_environment = environment; ???????????_options = options; ???????????_section = section; ???????????_file = file; ???????} ???????public T Value => this._options.CurrentValue; ???????//public T CurrentValue => this._options.CurrentValue; ???????public T Get(string name) => _options.Get(name); ???????//public IDisposable OnChange(Action<T, string> listener) ???????//{ ???????// ???throw new NotImplementedException(); ???????//} ???????public void Update(Action<T> applyChanges) ???????{ ???????????var fileProvider = _environment.ContentRootFileProvider; ???????????var fileInfo = fileProvider.GetFileInfo(_file); ???????????var physicalPath = fileInfo.PhysicalPath; ???????????var jObject = JsonConvert.DeserializeObject<JObject>(File.ReadAllText(physicalPath)); ???????????var sectionObject = jObject.TryGetValue(_section, out JToken section) ? ???????????????JsonConvert.DeserializeObject<T>(section.ToString()) : (Value ?? new T()); ???????????applyChanges(sectionObject); ???????????jObject[_section] = JObject.Parse(JsonConvert.SerializeObject(sectionObject)); ???????????File.WriteAllText(physicalPath, JsonConvert.SerializeObject(jObject, Formatting.Indented)); ???????} ???} ???/// <summary> ???/// 把json文件节点绑定到类的扩展方法，具有修改功能 ???/// </summary> ???public static class ServiceCollectionExtensions ???{ ???????public static void ConfigureWritable<T>( ???????????this IServiceCollection services, ???????????IConfigurationSection section, ???????????string file = "appsettings.json") where T : class, new() ???????{ ???????????services.Configure<T>(section); ???????????services.AddTransient<IWritableOptions<T>>(provider => ???????????{ ???????????????var environment = provider.GetService<IHostingEnvironment>(); ???????????????var options = provider.GetService<IOptionsMonitor<T>>(); ???????????????????????????????return new WritableOptions<T>(environment, options, section.Key, file); ???????????}); ???????} ???}

[Area("admin")] ???public class BlogSettingsController : AdminBaseController ???{ ???????private IWritableOptions<BlogSettingsViewModel> _option; ???????public BlogSettingsController(IWritableOptions<BlogSettingsViewModel> option) ???????{ ???????????_option = option; ???????} ???????// GET: /<controller>/ ???????public IActionResult Index() ???????{ ?????????????????????var entity = _option.Value; ???????????return View(entity); ???????} ???????/// <summary> ???????/// 保存网站设置,这里保存到json文件里面。 ???????/// </summary> ???????/// <param name="model"></param> ???????/// <returns></returns> ???????[HttpPost] ???????public IActionResult Save(BlogSettingsViewModel model) ???????{ ???????????????????????try ???????????{ ???????????????//这里会导致多线程操作同个文件 ???????????????_option.Update(opt => { ???????????????????opt.Title = model.Title; ???????????????????opt.Logo = model.Logo; ???????????????????opt.Subtitle = model.Subtitle; ???????????????????opt.Url = model.Url; ???????????????????opt.Abstract = model.Abstract; ???????????????????opt.Keywords = model.Keywords; ???????????????????opt.Description = model.Description; ???????????????????opt.LogoText = model.LogoText; ???????????????????opt.QQAppId = model.QQAppId; ???????????????????opt.Statistics = model.Statistics; ???????????????????opt.QQAppKey = model.QQAppKey; ???????????????}); ???????????????return Json(new Response() { Code = ResponseCode.Success, Message = "保存成功!" }); ???????????} ???????????catch(Exception ex) ???????????{ ???????????????return Json(new Response() { Code = ResponseCode.Fail, Message = ex.Message }); ???????????} ???????????????????} ???????????}