我目前正在开发一个使用aspnet core 3.1和Angular 9的小型电子商务网站，在订单验证期间出现错误。
当我验证订单时，我收到500类型错误，我无法理解问题的出处，预购应该在验证后显示在管理区域中，但是暂时无法使用，因此如果有人可以帮助我，因为我真的被困住了，这会非常好
订单模型（clientapp）：
import { Injectable } from '@angular/core';
import { Cart } from './cart.model';
import { Repository } from './repository';
import { Router, NavigationStart } from '@angular/router';
import { filter } from 'rxjs/operators';
@Injectable()
export class Order {
constructor(
private repo: Repository,
public cart: Cart,
private router: Router
) {
this.router.events.pipe(
filter(event => event instanceof NavigationStart))
.subscribe(event => {
if (router.url.startsWith('/checkout')
&& this.name != null && this.address != null) {
repo.storeSessionData('checkout', {
name: this.name,
address: this.address,
cardNumber: this.payment.cardNumber,
cardExpiry: this.payment.cardExpiry,
cardSecurityCode: this.payment.cardSecurityCode
});
}
});
repo.getSessionData('checkout').subscribe(data => {
if (data != null) {
this.name = data.name;
this.address = data.address;
this.payment.cardNumber = data.cardNumber;
this.payment.cardExpiry = data.cardExpiry;
this.payment.cardSecurityCode = data.cardSecurityCode;
}
});
}
orderId: number;
name: string;
address: string;
// tslint:disable: no-use-before-declare
payment: Payment = new Payment();
// tslint:disable: no-inferrable-types
submitted: boolean = false;
shipped: boolean = false;
orderConfirmation: OrderConfirmation;
get clothes(): CartLine[] {
return this.cart.selections
.map(p => new CartLine(p.clotheId, p.quantity));
}
clear() {
this.name = null;
this.address = null;
this.payment = new Payment();
this.cart.clear();
this.submitted = false;
}
submit() {
this.submitted = true;
this.repo.createOrder(this);
}
}
export class Payment {
cardNumber: string;
cardExpiry: string;
cardSecurityCode: string;
}
export class CartLine {
constructor(private clotheId: number,
private quantity: number) {}
}
export class OrderConfirmation {
constructor(public orderId: number,
public authCode: string,
public amount: number) {}
}
服务：
getOrders() {
this.http.get<Order[]>(ordersUrl)
.subscribe(data => this.orders = data);
}
createOrder(order: Order) {
this.http.post<any>(ordersUrl, {
name: order.name,
address: order.address,
payment: order.payment,
clothes: order.clothes
}).subscribe(data => {
order.orderConfirmation = data;
order.cart.clear();
order.clear();
});
}
shipOrder(order: Order) {
this.http.post(ordersUrl + '/' + order.orderId, null)
.subscribe(r => this.getOrders());
}
order.component.html：
<div class="container mt-5">
<table *ngIf="orders?.length > 0; else nodata" class="table table-striped">
<tr>
<th>Customer</th>
<th>Address</th>
<th>Clothes</th>
<th>Total</th>
<th></th>
</tr>
<tr *ngFor="let o of orders">
<td>{{o.name}}</td>
<td>{{o.address}}</td>
<td>{{o.clothes.length}}</td>
<td>{{o.payment.total | currency:'USD'}}</td>
<td *ngIf="!o.shipped; else shipped">
<button class="btn btn-sm btn-primary" (click)="markShipped(o)">
Ship
</button>
</td>
</tr>
</table>
<ng-template #shipped>
<td>Shipped</td>
</ng-template>
<ng-template #nodata>
<h3 class="text-center">There are no orders</h3>
</ng-template>
</div>
order.component.ts：
import { Component } from '@angular/core';
import { Repository } from 'src/app/models/repository';
import { Order } from 'src/app/models/order.model';
@Component({
selector: 'app-order-admin',
templateUrl: './order-admin.component.html',
styleUrls: ['./order-admin.component.css']
})
export class OrderAdminComponent {
constructor(private repo: Repository) { }
get orders(): Order[] {
return this.repo.orders;
}
markShipped(order: Order) {
this.repo.shipOrder(order);
}
}
我的控制器：
using System.Collections.Generic;
using System.Linq;
using Eshop.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
namespace Eshop.Controllers
{
[Route("/api/orders")]
public class OrderValuesController : Controller
{
private DataContext context;
public OrderValuesController(DataContext ctx)
{
context = ctx;
}
[HttpGet]
public IEnumerable<Order> GetOrders()
{
return context.Orders
.Include(o => o.Clothes).Include(o => o.Payment);
}
[HttpPost("{id}")]
public void MarkShipped(long id)
{
Order order = context.Orders.Find(id);
if (order != null)
{
order.Shipped = true;
context.SaveChanges();
}
}
[HttpPost]
public IActionResult CreateOrder([FromBody] Order order)
{
if (ModelState.IsValid)
{
order.OrderId = 0;
order.Shipped = false;
order.Payment.Total = GetPrice(order.Clothes);
ProcessPayment(order.Payment);
if (order.Payment.AuthCode != null)
{
context.Add(order);
context.SaveChanges();
return Ok(new
{
orderId = order.OrderId,
authCode = order.Payment.AuthCode,
amount = order.Payment.Total
});
}
else
{
return BadRequest("Payment rejected");
}
}
return BadRequest(ModelState);
}
private decimal GetPrice(IEnumerable<CartLine> lines)
{
IEnumerable<long> ids = lines.Select(l => l.ClotheId);
return context.Clothes
.Where(m => ids.Contains(m.ClotheId))
.Select(m => lines
.First(l => l.ClotheId == m.ClotheId).Quantity * m.Price)
.Sum();
}
private void ProcessPayment(Payment payment)
{
// integrate your payment system here
payment.AuthCode = "12345";
}
}
}
这就是控制台所说的：
fail: Microsoft.AspNetCore.SpaServices[0]
ERROR in ./node_modules/bootstrap/dist/css/bootstrap.min.css
Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/postcss-loader/src/index.js):
Error: ENOENT: no such file or directory, open 'C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\bootstrap\dist\css\bootstrap.min.css'
at Object.openSync (fs.js:443:3)
at Object.readFileSync (fs.js:343:35)
at Storage.provideSync (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:98:13)
at CachedInputFileSystem.readFileSync (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:259:32)
at Observable.rxjs_1.Observable.obs [as _subscribe] (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@ngtools\webpack\src\webpack-input-host.js:35:51)
at Observable._trySubscribe (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@ngtools\webpack\node_modules\rxjs\internal\Observable.js:44:25)
at Observable.subscribe (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@ngtools\webpack\node_modules\rxjs\internal\Observable.js:30:22)
at SyncDelegateHost._doSyncCall (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@angular-devkit\core\src\virtual-fs\host\sync.js:22:20)
at SyncDelegateHost.read (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@angular-devkit\core\src\virtual-fs\host\sync.js:49:21)
at WebpackCompilerHost.readFileBuffer (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@ngtools\webpack\src\compiler_host.js:161:44)
at VirtualFileSystemDecorator.readFile (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@ngtools\webpack\src\virtual_file_system_decorator.js:42:54)
at processResource (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:202:11)
fail: Microsoft.AspNetCore.SpaServices[0]
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:158:10)
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:165:10)
at C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:176:18
at loadLoader (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\loadLoader.js:47:3)
at runLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\webpack\lib\NormalModule.js:313:20)
at C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:367:11
at C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:203:19
at VirtualFileSystemDecorator.readFile (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\@ngtools\webpack\src\virtual_file_system_decorator.js:46:13)
at processResource (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:202:11)
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:158:10)
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:165:10)
at C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:176:18
at loadLoader (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\loadLoader.js:47:3)
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:169:2)
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:165:10)
at C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:176:18
at loadLoader (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\loadLoader.js:47:3)
at iteratePitchingLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:169:2)
at runLoaders (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\loader-runner\lib\LoaderRunner.js:365:2)
at NormalModule.doBuild (C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\node_modules\webpack\lib\NormalModule.js:292:3)
fail: Microsoft.AspNetCore.SpaServices[0]
ERROR in ./src/polyfills.ts
Module not found: Error: Can't resolve 'bootswatch' in 'C:\Users\Spartacus\Desktop\Core.net\ClotheShop\ClientApp\src'
fail: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
An unhandled exception has occurred while executing the request.
System.InvalidOperationException: When called from 'VisitLambda', rewriting a node of type 'System.Linq.Expressions.ParameterExpression' must return a non-null value
of the same type. Alternatively, override 'VisitLambda' and change it to not visit children of this type.
at System.Linq.Expressions.ExpressionVisitor.VisitAndConvert[T](T node, String callerName)
at System.Dynamic.Utils.ExpressionVisitorUtils.VisitParameters(ExpressionVisitor visitor, IParameterProvider nodes, String callerName)
at System.Linq.Expressions.ExpressionVisitor.VisitLambda[T](Expression`1 node)
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.Visit(Expression expression)
at System.Dynamic.Utils.ExpressionVisitorUtils.VisitArguments(ExpressionVisitor visitor, IArgumentProvider nodes)
at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.Visit(Expression expression)
at System.Linq.Expressions.ExpressionVisitor.VisitMember(MemberExpression node)
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.Visit(Expression expression)
at System.Linq.Expressions.ExpressionVisitor.VisitUnary(UnaryExpression node)
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.Visit(Expression expression)
at System.Linq.Expressions.ExpressionVisitor.VisitBinary(BinaryExpression node)
at System.Linq.Expressions.BinaryExpression.Accept(ExpressionVisitor visitor)
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.Visit(Expression expression)
at Microsoft.EntityFrameworkCore.Query.Internal.RelationalProjectionBindingExpressionVisitor.Translate(SelectExpression selectExpression, Expression expression)
at Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslatingExpressionVisitor.TranslateSelect(ShapedQueryExpression source, LambdaExpression selector)
at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at Microsoft.EntityFrameworkCore.Query.QueryCompilationContext.CreateQueryExecutor[TResult](Expression query)
at Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery[TResult](Expression query, Boolean async)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore[TResult](IDatabase database, Expression query, IModel model, Boolean async)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass9_0`1.<Execute>b__0()
at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQueryCore[TFunc](Object cacheKey, Func`1 compiler)
at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
at System.Linq.Queryable.Sum(IQueryable`1 source)
at Eshop.Controllers.OrderValuesController.GetPrice(IEnumerable`1 lines) in C:\Users\Spartacus\Desktop\Core.net\ClotheShop\Controllers\OrderValuesController.cs:line 63
at Eshop.Controllers.OrderValuesController.CreateOrder(Order order) in C:\Users\Spartacus\Desktop\Core.net\ClotheShop\Controllers\OrderValuesController.cs:line 40
at lambda_method(Closure , Object , Object[] )
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
感谢您的帮助！
请我需要帮助，我真的找不到解决方法