.Net Core 中间件——从请求中获取表单数据
.Net Core Middleware - Getting Form Data from Request
在 .NET Core Web 应用程序中,我使用中间件 (app.UseMyMiddleware) 为每个请求添加一些日志记录:
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler(MyMiddleware.GenericExceptionHandler);
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseMyMiddleware();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
public static void UseMyMiddleware(this IApplicationBuilder app)
{
app.Use(async (context, next) =>
{
await Task.Run(() => HitDetails.StoreHitDetails(context));
await next.Invoke();
});
}
public static void StoreHitDetails(HttpContext context)
{
var config = (IConfiguration)context.RequestServices.GetService(typeof(IConfiguration));
var settings = new Settings(config);
var connectionString = config.GetConnectionString("Common");
var features = context.Features.Get<IHttpRequestFeature>();
var url = $"{features.Scheme}://{context.Request.Host.Value}{features.RawTarget}";
var parameters = new
{
SYSTEM_CODE = settings.SystemName,
REMOTE_HOST = context.Connection.RemoteIpAddress.ToString(),
HTTP_REFERER = context.Request.Headers["Referer"].ToString(),
HTTP_URL = url,
LOCAL_ADDR = context.Connection.LocalIpAddress.ToString(),
AUTH_USER = context.User.Identity.Name
};
using (IDbConnection db = new SqlConnection(connectionString))
{
db.Query("StoreHitDetails", parameters, commandType: CommandType.StoredProcedure);
}
}
一切正常,我可以从请求中获取我需要的大部分内容,但接下来我需要的是 POST 方法上的表单数据。
context.Request.Form 是一个可用选项,但在调试时我将鼠标悬停在它上面并看到 "The function evaluation requires all thread to run"。如果我尝试使用它,应用程序就会挂起。
我需要做什么才能访问 Request.Form 或者是否有替代 属性 和 POST 我没有看到的数据?
您可以创建一个单独的中间件而不是内联中间件,然后从那里调用 HitDetails.StoreHitDetails
。
public class MyMiddleware
{
private readonly RequestDelegate _next;
public MyMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext context)
{
HitDetails.StoreHitDetails(context);
await _next(context);
}
}
// Extension method used to add the middleware to the HTTP request pipeline.
public static class MiddlewareExtensions
{
public static IApplicationBuilder UseMyMiddleware(this IApplicationBuilder builder)
{
return builder.UseMiddleware<MyMiddleware>();
}
}
这样您就可以继续使用 app.UseMyMiddleware();
,而不必像您提到的那样使用 Task.Run
运行。
或者您可以尝试调用 HitDetails.StoreHitDetails(context)
而不是将其包装在 Task.Run
中
已编辑
检查您的 Request
内容类型是否正确:
if (context.Request.HasFormContentType)
{
IFormCollection form;
form = context.Request.Form; // sync
// Or
form = await context.Request.ReadFormAsync(); // async
string param1 = form["param1"];
string param2 = form["param2"];
}
在 .NET Core Web 应用程序中,我使用中间件 (app.UseMyMiddleware) 为每个请求添加一些日志记录:
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler(MyMiddleware.GenericExceptionHandler);
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseMyMiddleware();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
public static void UseMyMiddleware(this IApplicationBuilder app)
{
app.Use(async (context, next) =>
{
await Task.Run(() => HitDetails.StoreHitDetails(context));
await next.Invoke();
});
}
public static void StoreHitDetails(HttpContext context)
{
var config = (IConfiguration)context.RequestServices.GetService(typeof(IConfiguration));
var settings = new Settings(config);
var connectionString = config.GetConnectionString("Common");
var features = context.Features.Get<IHttpRequestFeature>();
var url = $"{features.Scheme}://{context.Request.Host.Value}{features.RawTarget}";
var parameters = new
{
SYSTEM_CODE = settings.SystemName,
REMOTE_HOST = context.Connection.RemoteIpAddress.ToString(),
HTTP_REFERER = context.Request.Headers["Referer"].ToString(),
HTTP_URL = url,
LOCAL_ADDR = context.Connection.LocalIpAddress.ToString(),
AUTH_USER = context.User.Identity.Name
};
using (IDbConnection db = new SqlConnection(connectionString))
{
db.Query("StoreHitDetails", parameters, commandType: CommandType.StoredProcedure);
}
}
一切正常,我可以从请求中获取我需要的大部分内容,但接下来我需要的是 POST 方法上的表单数据。
context.Request.Form 是一个可用选项,但在调试时我将鼠标悬停在它上面并看到 "The function evaluation requires all thread to run"。如果我尝试使用它,应用程序就会挂起。
我需要做什么才能访问 Request.Form 或者是否有替代 属性 和 POST 我没有看到的数据?
您可以创建一个单独的中间件而不是内联中间件,然后从那里调用 HitDetails.StoreHitDetails
。
public class MyMiddleware
{
private readonly RequestDelegate _next;
public MyMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext context)
{
HitDetails.StoreHitDetails(context);
await _next(context);
}
}
// Extension method used to add the middleware to the HTTP request pipeline.
public static class MiddlewareExtensions
{
public static IApplicationBuilder UseMyMiddleware(this IApplicationBuilder builder)
{
return builder.UseMiddleware<MyMiddleware>();
}
}
这样您就可以继续使用 app.UseMyMiddleware();
,而不必像您提到的那样使用 Task.Run
运行。
或者您可以尝试调用 HitDetails.StoreHitDetails(context)
而不是将其包装在 Task.Run
已编辑
检查您的 Request
内容类型是否正确:
if (context.Request.HasFormContentType)
{
IFormCollection form;
form = context.Request.Form; // sync
// Or
form = await context.Request.ReadFormAsync(); // async
string param1 = form["param1"];
string param2 = form["param2"];
}