C#web服务开发

刺骨的言语ヽ痛彻心扉 2021-09-20 14:52 240阅读 0赞

1、Program.cs声明程序入口static main()函数，用startup内方法创建和初始化web类对象

Startup.cs初始化内容，涉及路由设计和服务绑定、依赖注入等全局初始化，实现主要两个配置初始化方法

// This method gets called by the runtime. Use this method to add services to the container.  
              public void ConfigureServices(IServiceCollection services)

和

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.  
              public void Configure(IApplicationBuilder app, IHostingEnvironment env)

2、web服务添加

IServiceCollection services
    
    services.AddSingleton();//方法创建一个Singleton服务，首次请求会创建服务，然后，所有后续的请求中都会使用相同的实例，整个应用程序生命周期都使用该单个实例
    
    services.AddScoped();//不同http清求，实例不同，同名谓词不同，也不行。例如httpget跟httppost,作用域是一定范围内，例如从同一个post请求的create方法，只能统计一次，每次请求都是新的实例
    
    services.AddTransient();//临时服务，每次请求时，都会创建一个新的Transient服务实例
    
    services.AddControllersWithViews(option =>
                    {
                        option.Filters.Add<AuthorizationFilter>();
                    }).AddNewtonsoftJson();//添加MVC框架服务，绑定过滤认证信息方法，绑定json格式输入输出
    
    services.AddSwaggerGen(options =>
                {
                    options.SwaggerDoc("v1", new OpenApiInfo
                    {
                        Version = "v1",
                        Title = "MsSystem API",
                        Description = "RESTful API for My Web Application",
                        //TermsOfService = null,
                    });
    
                    //Determine base path for the application.  
                    var basePath = PlatformServices.Default.Application.ApplicationBasePath;
                    //Set the comments path for the swagger json and ui.  
                    var xmlPath = Path.Combine(basePath, "Host.xml");
                    options.IncludeXmlComments(xmlPath);
                });//swagger自动生成接口文档

3、http请求信息类ActionContext，派生多种处理类供controller解析信息处理

授权过滤器，认证信息检查，AuthorizationFilterContext  继承  FilterContext  继承  ActionContext

//特性声明 [NoLogin]使用
    public class NoLoginAttribute : Attribute
    {
    }
    
    public class AuthorizationFilter : IAsyncAuthorizationFilter
    {
    	public Task OnAuthorizationAsync(AuthorizationFilterContext context)
    	{
            //检查调用者controller的Attribute属性有无NoLogin
    		if (context.ActionDescriptor is ControllerActionDescriptor controllerActionDescriptor)
    		{
    			var noNeedLoginAttribute = controllerActionDescriptor.
    							   ControllerTypeInfo.
    							   GetCustomAttributes(true)
    							   .Where(a => a.GetType().Equals(typeof(NoLoginAttribute)))
    							   .ToList();
    			noNeedLoginAttribute.AddRange(controllerActionDescriptor.MethodInfo.GetCustomAttributes(inherit: true)
    							 .Where(a => a.GetType().Equals(typeof(NoLoginAttribute))).ToList());
    
    			//如果标记了 NoLoginAttribute 则不验证其登录状态
    			if (noNeedLoginAttribute.Any())
    			{
    				return Task.CompletedTask;
    			}
    		}
    
    		var token = context.HttpContext.Request.Headers["token"].ToString();
    		if (!token.IsNullOrWhiteSpace())
    		{
    			var time = token.DES3Decrypt().ToDateTime();
    			//登录信息有效期为当天
    			if (DateTime.Now.Date == time.Date)
    			{
    				return Task.CompletedTask;
    			}
    		}
    
    		context.Result = new JsonResult(new
    		{
    			ErrorMsg = "请登录",
    			ResultUrl = "/signin",
    		});
    		context.HttpContext.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
    		return Task.CompletedTask;
    	}
    }

swagger生效，在startup的配置方法内public void Configure(IApplicationBuilder app, IHostingEnvironment env)

app.UseSwagger();  
app.UseSwaggerUI(c =>  
 \{  
       c.SwaggerEndpoint("/swagger/v1/swagger.json", "MsSystem API V1");  
\});

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