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# asp.net core移植
[TOC]
## 替换方案
|Asp. Net Mvc | ASP. NET Core|说明|
|:--|:--|:--:|
|HttpRuntime.AppDomainAppVirtualPath||据说已被干掉，用不到|
|HttpRuntime.AppDomainAppPath|(IHostingEnvironment)Env.ContentRootPath||
|HttpPostedFileBase|IFormFile||
|Request[key]|Request.Form[key] & Request.Query[key]|需要判断这两个，返回的类型StringValues，而不会是null|
|Request.IsAjaxRequest()|Request.Headers["x-requested-with"]=="XMLHttpRequest"||
|Request.QueryString[key]|Request.Query[key]||
|Request.RawUrl|Request.GetEncodedUrl()||
|Request.RouteData.GetRequiredString()|HttpContext.GetRouteValue()||
|Request.ServerVariables|Request.Headers|ASP.NET Core中没有ServerVariables的对应实现，有的可以在HttpContext.Request.Headers中获取|
|Request.Url.PathAndQuery|Request.GetEncodedPathAndQuery()||
|Request.UrlReferrer|Request.Headers[HeaderNames.Referer]|
|Request.UserAgent|Request.Headers[HeaderNames.UserAgent]||
|Response.Output|new StreamWriter(HttpContext.Response.Body)||
|System.Runtime.Caching|Microsoft.Extensions.Caching.Memory||
||||
||||
||||
## 注意
- request.Form根据请求类型决定该参数是否可以正常读取
## 路由
- 其中url以及以前defaults参数的默认值可使用template代替，直接指定默认值
- id后一定要加问号，效果等同于`Asp. Net Mvc`的`id = UrlParameter.Optional`
```csharp
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
```
## 区域
- [官方文档](https://docs.microsoft.com/zh-cn/aspnet/core/mvc/controllers/areas)
- `Asp. Net Mvc`中的区域会自动注册本区域文件夹里面的控制器作为区域的控制器， `Asp. Net Core Mvc`需要在控制器使用特性`[AdminArea]`指定区域，如果不指定区域就是和正常控制器一样，即使它位于区域文件夹
- `Asp. Net Core Mvc`一定要进行区域路由注册，否则无法匹配带有`Area`特性的控制器
- 在没有任何路由注册默认控制器为`Index`的情况下，如果有控制器名为`IndexController`，在`Asp. Net Mvc`中访问`/Admin/`，会匹配此控制器，但在`Asp. Net Core Mvc`中需要指定路由默认控制器有`Index`才能匹配
- 总的来说，`Asp. Net Core Mvc`什么都要指定都要设置，不能偷懒
- 路由注册示例
```csharp
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
"CubeAreas",
"{area=Admin}/{controller=Index}/{action=Index}/{id?}");
endpoints.MapRazorPages();
});
.Build();
```
## 视图命名空间导入
- 由`web.config`换成`_ViewImports.cshtml`，使用`@using`
## http模块到中间件
- [中间件介绍](https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/middleware/index?view=aspnetcore-2.1&tabs=aspnetcore2x#middleware-writing-middleware)
- [http模块迁移到中间件](https://docs.microsoft.com/zh-cn/aspnet/core/migration/http-modules?view=aspnetcore-2.1#migrating-module-insertion-into-the-request-pipeline)
## 添加http上下文
- ConfigureServices
```csharp
//添加Http上下文访问器
StaticHttpContextExtensions.AddHttpContextAccessor(services);
```
- Configure
```csharp
//配置静态Http上下文访问器
app.UseStaticHttpContext();
```
## Razor视图
- [参考博客](https://www.cnblogs.com/tcjiaan/p/8412827.html)
- 分部页替换：`<partial name="_Login_Login"/>`或`@await Html.PartialAsync("_Login_Login")`
### 导入命名空间
- `Views`文件夹下的`_ViewImports.cshtml`
### RazorOptions
```csharp
services
.AddMvc()
.AddRazorOptions(opt =>
{
opt.ViewLocationFormats.Clear();
opt.AreaViewLocationFormats.Clear();
opt.ViewLocationFormats.Add("~/Views/{1}/{0}.cshtml");
opt.ViewLocationFormats.Add("~/Views/Shared/{0}.cshtml");
opt.AreaViewLocationFormats.Add("~/Areas/{2}/Views/{1}/{0}.cshtml");
opt.AreaViewLocationFormats.Add("~/Areas/{2}/Views/Shared/{0}.cshtml");
});
```
### 视图引擎
## 模型绑定
### IModelBinder
- [官网](https://docs.microsoft.com/zh-cn/aspnet/core/mvc/advanced/custom-model-binding)
- 继承自`Microsoft.AspNetCore.Mvc.ModelBinding.IModelBinder`
- `CreateModel`改为`BindModelAsync`方法
- `modelType`模型类型`bindingContext.ModelType`
- `controllerContext`为`bindingContext.ActionContext`
- 返回object改成
```csharp
bindingContext.Result = ModelBindingResult.Success(entity);
return Task.CompletedTask;
```
- 示例
```csharp
public class EntityModelBinder:IModelBinder
{
public Task BindModelAsync(ModelBindingContext bindingContext)
{
var modelType = bindingContext.ModelType;
var controllerContext = bindingContext.ActionContext;
if (modelType.As<IEntity>())
{
var fact = EntityFactory.CreateFactory(modelType);
if (fact != null)
{
bindingContext.Result = ModelBindingResult.Success(fact.Create());
}
}
return Task.CompletedTask;
}
```
### IModelBinderProvider
```csharp
public class EntityModelBinderProvider : IModelBinderProvider
{
public IModelBinder GetBinder(ModelBinderProviderContext context) =>
context.Metadata.ModelType.As<IEntity>() ? new EntityModelBinder() : null;
}
```
### 使用
- 放在第一位优先调用
```csharp
services.AddMvc(opt =>
{
//模型绑定
opt.ModelBinderProviders.Insert(0,new EntityModelBinderProvider());
});
```
## 过滤器
## 上传文件大小限制
- https://stackoverflow.com/questions/38698350/increase-upload-file-size-in-asp-net-core
```csharp
.UseKestrel(options =>
{
options.Limits.MaxRequestBodySize = null;
}
```
## 数据验证
- ValidateAntiForgeryToken
## 模型绑定验证
## 响应流写入、设置、推送
## 登录授权
- https://stackoverflow.com/questions/46853920/net-core-authentication
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