机遇屋-.net core2.1升级到最新

.net core2.1升级到最新

作者：ych

#### 2.1升级到3.1
安装
```
Install-Package Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation -Version 3.1.2
```
1.WEB项目中Startup.cs
ConfigureServices 方法中 services.AddMvc() 改为 services.AddControllersWithViews()
```
//services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddControllersWithViews().AddRazorRuntimeCompilation();
```
2.Configure 方法中 app.UseMvc() 改为 app.UseRouting() 与 app.UseEndpoints()
```
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
    }
    app.UseStaticFiles();
    app.UseAuthorization();
    app.UseRouting();
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllerRoute(
            name: "default",
            pattern: "{controller=Home}/{action=Index}/{id?}");
    });
}
```
3，更新所有(相关)nuget包到最新

4，重新生成解决方案，报错 The project …. must provide a value for Configuration.
从 Web 项目中移除 Microsoft.AspNetCore… 的 PackageReference，因为已经包含在3.1的目标框架内了。
```
<PackageReference Include="Microsoft.AspNetCore.App" />
<PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.2.0" PrivateAssets="All" />
```
5.IHostingEnvironment替换IWebHostEnvironment

#### 2.1升级到6.0
移除依赖库

安装Razor引擎
```
Install-Package Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation -Version 6.0.5
```
1.WEB项目中Startup.cs
ConfigureServices 方法中 services.AddMvc() 改为 services.AddControllersWithViews()
```
//services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddControllersWithViews().AddRazorRuntimeCompilation();
```
2.Configure 方法中 app.UseMvc() 改为 app.UseRouting() 与 app.UseEndpoints()
```
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/NoPower");
    }
    app.UseStaticFiles();
    app.UseRouting();
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllerRoute(
            name: "default",
            pattern: "{controller=Home}/{action=Index}/{id?}");
    });
}
```
#### 其它问题
##### 序列化问题
BinaryFormatter serialization and deserialization are disabled within this
添加`<EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>`
```
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
  </PropertyGroup>
```

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