ASP.NET中间件可以通过调用下一个中间件或处理程序来执行以下操作,但是不能直接调用另一个Action。
一种解决方法是使用.NET的HttpClient来请求另一个Controller的Action。以下是示例:
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
public class MyMiddleware
{
private readonly RequestDelegate _next;
private readonly HttpClient _httpClient;
public MyMiddleware(RequestDelegate next)
{
_next = next;
_httpClient = new HttpClient();
}
public async Task Invoke(HttpContext context)
{
//调用另一个Controller的Action
var response = await _httpClient.GetAsync("http://localhost:5000/MyController/MyAction");
//使用响应内容继续处理
var content = await response.Content.ReadAsStringAsync();
await context.Response.WriteAsync("Response from MyController/MyAction: " + content);
}
}
在此示例中,MyMiddleware使用HttpClient来请求MyController中的MyAction,然后将响应内容写回到Response中。请注意,此方法仅适用于请求不需要当前HttpContext的Action。
如果需要使用当前HttpContext,请使用以下代码示例调用另一个Controller的Action:
public class MyMiddleware
{
private readonly RequestDelegate _next;
private readonly IServiceProvider _serviceProvider;
public MyMiddleware(RequestDelegate next, IServiceProvider serviceProvider)
{
_next = next;
_serviceProvider = serviceProvider;
}
public async Task Invoke(HttpContext context)
{
//使用IServiceProvider获取MyController实例
var controller = _serviceProvider.GetService(typeof(MyController)) as MyController;
//调用MyAction,并传递当前HttpContext
var result = await controller.MyAction(context);
//使用ActionResult处理结果
await result.ExecuteResultAsync(new ActionContext { HttpContext = context });
}
}
public class MyController : Controller
{
public async Task MyAction(HttpContext context)
{
//使用当前HttpContext处理数据
var data = "Hello from MyController/MyAction using HttpContext";
return Ok(data);
}
}
在此示例中,MyMiddleware使用IServiceProvider获取MyController实例,然后调用MyController中的MyAction,并传递当前HttpContext。MyAction中可以对HttpContext进行处理,并使用ActionResult返回结果。MyMiddleware将结果传递给ActionContext并执行结果。