Asp.Net Core 中的“虚拟目录”实现(2)

{ "Logging": { "LogLevel": { "Default": "Information", "Microsoft": "Warning", "Microsoft.Hosting.Lifetime": "Information" } }, "AllowedHosts": "*", "VirtualPath": [ { "RealPath": "F:\\test1", //真实路径 "RequestPath": "/test", "Alias": "first" }, { "RealPath": "F:\\test2", //真实路径 "RequestPath": "/test", "Alias": "second" }, { "RealPath": "F:\\test3", //真实路径 "RequestPath": "/test", "Alias": "third" } ] }

创建对应的实体映射：

public class VirtualPathConfig { public List<PathContent> VirtualPath { get; set; } } public class PathContent { public string RealPath { get; set; } public string RequestPath { get; set; } public string Alias { get; set; } }

在PhysicalFileProvider上封装一层，加入别名便于获取：

public class MyFileProvider : PhysicalFileProvider { public MyFileProvider(string root, string alias) : base(root) { this.Alias = alias; } public MyFileProvider(string root, Microsoft.Extensions.FileProviders.Physical.ExclusionFilters filters, string alias) : base(root, filters) { this.Alias = alias; } /// <summary> /// 别名 /// </summary> public string Alias { get; set; } }

调整Startup.ConfigureServices和Startup.Configure：

public void ConfigureServices(IServiceCollection services) { services.AddControllers(); services.Configure<VirtualPathConfig>(Configuration); var config = Configuration.Get<VirtualPathConfig>().VirtualPath; config.ForEach(f => { services.AddSingleton(new MyFileProvider(f.RealPath,f.Alias)); }); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } var config = Configuration.Get<VirtualPathConfig>().VirtualPath; config.ForEach(f => { app.UseStaticFiles(new StaticFileOptions() { FileProvider = new PhysicalFileProvider(f.RealPath), RequestPath =f.RequestPath }); }); app.UseRouting(); app.UseAuthorization(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); }

最后，调整调用方式，即可。

[HttpGet] public object GetFiles([FromServices] IEnumerable<MyFileProvider> fileProviders) { var file = fileProviders.FirstOrDefault(x=>x.Alias=="first").GetFileInfo("mybook.txt"); if (file.Exists) { return ReadTxtContent(file.PhysicalPath); } return 0; }

最后

　　物理文件系统的抽象通过PhysicalFileProvider这个FileProvider来实现，借助IFileProvider的特点，其实可以扩展实现轻量“云盘”的功能了，而不仅仅只是实现IIS虚拟目录功能。搞定，今晚不加班！

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