![](/img/trans.png)
[英]ASP.NET Core 2.1 - Displaying a list of strings on a specific html page
[英]ASP NET Core Serving specific html page
我有這個中間件:
public class SpecificPageMiddleware
{
private readonly RequestDelegate next;
public SpecificPageMiddleware(RequestDelegate next)
{
this.next = next;
}
public async Task Invoke(HttpContext context)
{
if (this.IsSubDomainRequest(context.Request.Host.Value))
{
if (this.IsIndexRequest(context.Request.Path.Value))
{
await this.ReturnIndexPage(context);
return;
}
}
await this.next.Invoke(context);
}
private bool IsSubDomainRequest(string host)
{
return host.StartsWith("subdomain")
|| host.Contains("subdomain");
}
private bool IsIndexRequest(string query)
{
return query == "/" || query == "/response.html";
}
private static async Task ReturnIndexPage(HttpContext context)
{
var file = new FileInfo(@"wwwroot\response.html");
byte[] buffer;
if (file.Exists)
{
context.Response.StatusCode = (int)HttpStatusCode.OK;
context.Response.ContentType = "text/html";
buffer = File.ReadAllBytes(file.FullName);
}
else
{
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
context.Response.ContentType = "text/plain";
buffer = Encoding.UTF8.GetBytes("Unable to find the requested file");
}
using (var stream = context.Response.Body)
{
await stream.WriteAsync(buffer, 0, buffer.Length);
await stream.FlushAsync();
}
context.Response.ContentLength = buffer.Length;
}
}
很簡單,當我得到這樣的東西時: subdomain.mydomain.com
我想顯示一個特定的html頁面,否則繼續正常的中間件管道到www.mydomain.com
。
當這個中間件被擊中時,它最終在瀏覽器中成為404。 如果我沒有設置內容類型,那么它最終為200,所有html都寫為文本,而不是呈現為html。 我在這里錯過了什么?
我不想使用app.UseDefaultFiles()
或app.UseStaticFiles()
。
你犯的一個錯誤是:
await this.ReturnIndexPage(context); // wrong!
await SpecificPageMiddleware.ReturnIndexPage(context); // right (1)
await ReturnIndexPage(context); // right (2)
this
意味着實例。 您無法從實例訪問static
方法。 相反,你必須使用類型名稱(1)或沒有資格(2)來限定它,你沒事。
為了更好的衡量, 這也是GitHub的演示。
SimpleMiddleware.cs
using Microsoft.AspNet.Builder;
using System.Threading.Tasks;
using Microsoft.AspNet.Http;
using System.IO;
using System.Text;
using System.Net;
namespace App04SimpleMiddleware
{
public class SimpleMiddleware
{
private readonly RequestDelegate _next;
public SimpleMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext context)
{
if (context.Request.QueryString.ToString().Contains("simple"))
{
await ReturnIndexPage(context); // right!
return;
}
await _next.Invoke(context);
}
private static async Task ReturnIndexPage(HttpContext context)
{
var file = new FileInfo(@"wwwroot\response.html");
byte[] buffer;
if (file.Exists)
{
context.Response.StatusCode = (int)HttpStatusCode.OK;
context.Response.ContentType = "text/html";
buffer = File.ReadAllBytes(file.FullName);
}
else
{
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
context.Response.ContentType = "text/plain";
buffer = Encoding.UTF8
.GetBytes("Unable to find the requested file");
}
context.Response.ContentLength = buffer.Length;
using (var stream = context.Response.Body)
{
await stream.WriteAsync(buffer, 0, buffer.Length);
await stream.FlushAsync();
}
}
}
}
Startup.cs
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Http;
namespace App04SimpleMiddleware
{
public class Startup
{
public void Configure(IApplicationBuilder app)
{
app.UseMiddleware<SimpleMiddleware>();
app.Run(async (context) =>
{
await context.Response.WriteAsync("Hello world!");
});
}
}
}
結果
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.