钦州网站网站建设,word模板网站,外卖网站开发方案,互联网媒体广告公司写在前面微软在更新.Net Core版本的时候#xff0c;动作往往很大#xff0c;使得每次更新版本的时候都得小心翼翼#xff0c;坑实在是太多。往往是悄咪咪的移除了某项功能或者组件#xff0c;或者不在支持XX方法#xff0c;这就很花时间去找回需要的东西了#xff0c;下面… 写在前面微软在更新.Net Core版本的时候动作往往很大使得每次更新版本的时候都得小心翼翼坑实在是太多。往往是悄咪咪的移除了某项功能或者组件或者不在支持XX方法这就很花时间去找回需要的东西了下面是个人在迁移.Net Core WebApi项目过程中遇到的问题汇总开始迁移1 修改*.csproj项目文件TargetFrameworknetcoreapp2.2/TargetFramework
修改为
TargetFrameworknetcoreapp3.1/TargetFramework
2 修改Programpublic static void Main(string[] args){CreateWebHostBuilder(args).Build().Run();}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) WebHost.CreateDefaultBuilder(args).UseStartupStartup().ConfigureAppConfiguration((hostingContext, config) {config.AddJsonFile($你的json文件.json, optional: true, reloadOnChange: true);}
);
修改为public static void Main(string[] args){CreateHostBuilder(args).Build().Run();}public static IHostBuilder CreateHostBuilder(string[] args) Host.CreateDefaultBuilder(args).ConfigureWebHostDefaults(webBuilder {webBuilder.UseStartupStartup().ConfigureAppConfiguration((hostingContext, config){config.AddJsonFile($你的json文件.json, optional: true, reloadOnChange: true);});});
3.1 修改Startup.ConfigureServicesservices.AddMvc();
修改为
services.AddControllers();
3.2 修改Startup.Configurepublic void Configure(IApplicationBuilder app, IHostingEnvironment env)
修改为
using Microsoft.Extensions.Hosting;
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
IHostingEnvironment在3.0之后已被标记弃用。路由配置app.UseMvc(routes {routes.MapRoute(name: areas,template: {area:exists}/{controllerHome}/{actionIndex}/{id?});routes.MapRoute(name: default,template: {controllerHome}/{actionIndex}/{id?});});
修改为app.UseRouting();app.UseEndpoints(endpoints {endpoints.MapControllers();endpoints.MapControllerRoute(name: areas,pattern: {area:exists}/{controllerHome}/{actionIndex}/{id?});endpoints.MapControllerRoute(name: default,pattern: {controllerHome}/{actionIndex}/{id?});});
你以为结束了还没。坑这时候你以为结束了兴高采烈的去服务器装好runningTime和hosting相应的版本运行……HTTP Error 500.30 – ANCM In-Process Start Failure直接cmd进入到发布目录执行E:\你的路径dotnet xxx.dll
显示详细错误而我的相应250代码行是services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
//原文地址https://www.cnblogs.com/EminemJK/p/13206747.html
搜索最新的AutoMapper根本没更新或改变所以不是这个组件的问题。尝试下载补丁Windows6.1-KB974405-x64.msu 无果……卸载sdk重置无果……修改web.config无果……修改应用池32位无果……最后查看发布勾选上【删除现有文件】解决……Endpoint contains CORS metadata, but a middleware was not found that supports CORS.顺利可以启动项目之后发现有些接口2020-06-29 10:02:23,357 [14] ERROR System.String - 全局异常捕捉异常Endpoint contains CORS metadata, but a middleware was not found that supports CORS.
Configure your application startup by adding app.UseCors() inside the call to Configure(..) in the application startup code. The call to app.UseAuthorization() must appear between app.UseRouting() and app.UseEndpoints(...).
提示很明显在.net core 2.2 的时候不是需要强制在指定位置的app.UseCors();
在3.0之后需要设置在app.UseRouting和app.UseEndpoints 之间app.UseRouting();
//跨域
app.UseCors(one);
app.UseCors(two);
……
app.UseEndpoints(endpoints ……
The JSON value could not be converted to System.Int32. Path……运行之后有些接口没有数据返回而有些直接报错了。原因又是爸爸把Newtonsoft.Json移除使用内置的System.Text.Json所以依赖于Newtonsoft.Json的组件将不可用那么只能手动添加。Install-Package Microsoft.AspNetCore.Mvc.NewtonsoftJson -Version 3.1.5
然后添加引用public void ConfigureServices(IServiceCollection services)
{services.AddControllers().AddNewtonsoftJson();……
}
目前还不太建议你使用内置的序列化因为实在太多功能或方法不支持详细对比请参考 https://docs.microsoft.com/zh-cn/dotnet/standard/serialization/system-text-json-migrate-from-newtonsoft-how-to授权相关基于策略授权我想在座的加班狗都是大同小异在2.2以前public class PolicyHandler : AuthorizationHandlerPolicyRequirement{/// summary/// 授权方式cookie, bearer, oauth, openid/// /summarypublic IAuthenticationSchemeProvider Schemes { get; set; }private IConfiguration _configuration;/// summary/// ctor/// /summary/// param nameconfiguration/param/// param nameschemes/param/// param namejwtApp/parampublic PolicyHandler(IConfiguration configuration, IAuthenticationSchemeProvider schemes){Schemes schemes;_jwtApp jwtApp;_configuration configuration;}/// summary/// 授权处理/// /summary/// param namecontext/param/// param namerequirement/paramprotected override async Task HandleRequirementAsync(AuthorizationHandlerContext context, PolicyRequirement requirement){var httpContext (context.Resource as AuthorizationFilterContext).HttpContext;//获取授权方式var defaultAuthenticate await Schemes.GetDefaultAuthenticateSchemeAsync();if (defaultAuthenticate ! null){//验证签发的用户信息var result await httpContext.AuthenticateAsync(defaultAuthenticate.Name);if (result.Succeeded){httpContext.User result.Principal;//判断是否过期var expirationTime DateTime.Parse(httpContext.User.Claims.SingleOrDefault(s s.Type ClaimTypes.Expiration).Value);if (expirationTime DateTime.UtcNow){//你的校验方式//todocontext.Succeed(requirement);}else{HandleBlocked(context, requirement);}return;}}HandleBlocked(context, requirement);}/// summary/// 验证失败返回/// /summaryprivate void HandleBlocked(AuthorizationHandlerContext context, PolicyRequirement requirement){var authorizationFilterContext context.Resource as AuthorizationFilterContext;authorizationFilterContext.Result new Microsoft.AspNetCore.Mvc.JsonResult(new UnAuthorizativeResponse()) { StatusCode 202 };//不要调用 context.Fail(),设置为403会显示不了自定义信息,改为Accepted202,由客户端处理,;context.Succeed(requirement);}}
然后发现升级到3.0之后var httpContext (context.Resource as AuthorizationFilterContext).HttpContext;
3.0不再支持返回AuthorizationFilterContext而是返回的是RouteEndpoint这句代码就会报错所以修改的方式就是注入IHttpContextAccessor从里面获取HttpContext这里就不用演示了吧。并修改PolicyHandler校验失败时候调用的方法/// summary
/// 验证失败返回
/// /summary
private void HandleBlocked(AuthorizationHandlerContext context, PolicyRequirement requirement)
{context.Fail();
}
并在Startup.ConfigureServices修改services.AddHttpContextAccessor();
在AddJwtBearer中.AddJwtBearer(s {//3、添加 Jwt bearer s.TokenValidationParameters new TokenValidationParameters{ValidIssuer issuer,ValidAudience audience,IssuerSigningKey key,//允许的服务器时间偏差的偏移量ClockSkew TimeSpan.FromSeconds(5),ValidateLifetime true};s.Events new JwtBearerEvents{OnAuthenticationFailed context {//Token 过期 if (context.Exception.GetType() typeof(SecurityTokenExpiredException)){context.Response.Headers.Add(Token-Expired, true);} return Task.CompletedTask;},OnChallenge context {context.HandleResponse(); context.Response.StatusCode StatusCodes.Status200OK;context.Response.ContentType application/json;//无授权返回自定义信息context.Response.WriteAsync(JsonConvert.SerializeObject(new UnAuthorizativeResponse()));return Task.CompletedTask;}};});
UnAuthorizativeResponse 是自定义返回的内容。Startup.Configure中启用Authentication注意顺序app.UseRouting();
//跨域
app.UseCors(one);
app.UseCors(two);
……
//启用 Authentication
app.UseAuthorization();
app.UseAuthentication();
app.UseEndpoints(endpoints ……
文件下载单独封装的HttpContext下载方法public static void DownLoadFile(this HttpContext context,string fileName, byte[] fileByte, string contentType application/octet-stream)
{int bufferSize 1024;context.Response.ContentType contentType;context.Response.Headers.Append(Content-Disposition, attachment;filename HttpUtility.UrlEncode(fileName));context.Response.Headers.Append(Charset, utf-8);context.Response.Headers.Append(Access-Control-Expose-Headers, Content-Disposition);//context.Response.Headers.Append(Access-Control-Allow-Origin, *);//使用FileStream开始循环读取要下载文件的内容using (Stream fs new MemoryStream(fileByte)){using (context.Response.Body){long contentLength fs.Length;context.Response.ContentLength contentLength;byte[] buffer;long hasRead 0;while (hasRead contentLength){if (context.RequestAborted.IsCancellationRequested){break;}buffer new byte[bufferSize];//从下载文件中读取bufferSize(1024字节)大小的内容到服务器内存中int currentRead fs.Read(buffer, 0, bufferSize);context.Response.Body.Write(buffer, 0, currentRead);context.Response.Body.Flush();hasRead currentRead;}}}
}
下载的时候发现以下错误Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.2020-06-29 14:18:38,898 [109] ERROR System.String - System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.at Microsoft.AspNetCore.Server.IIS.Core.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count)at Microsoft.AspNetCore.Server.IIS.Core.WrappingStream.Write(Byte[] buffer, Int32 offset, Int32 count)at DigitalCertificateSystem.Common.Extensions.HttpContextExtension.DownLoadFile(HttpContext context, String fileName, Byte[] fileByte, String contentType) in ……
意思不运行同步操作修改为context.Response.Body.WriteAsync(buffer, 0, currentRead);
这才顺利完成了更新。真的太坑了不过也感觉微软的抽象化做得很好按需引入减少项目的冗余。更多升级指南请参考“孙子兵法”https://docs.microsoft.com/zh-cn/aspnet/core/migration/22-to-30?viewaspnetcore-2.1tabsvisual-studio
