上述方法增加几个细节，

好的，以下是上述方法的细节补充：

1. 添加组件和服务时，可以使用以下命令，指定组件和服务的目录：

ng generate component components/shopping-list
ng generate service services/shopping-list

这样可以将组件和服务分别放在“components”和“services”文件夹中，使项目更加清晰。

2. 在添加商品时，可以使用 Angular Material 中的对话框组件，示例代码如下：

shopping-list.component.ts:

import { MatDialog } from '@angular/material/dialog';
import { AddProductDialogComponent } from '../add-product-dialog/add-product-dialog.component';
import { ProductService } from '../services/product.service';

@Component({
  selector: 'app-shopping-list',
  templateUrl: './shopping-list.component.html',
  styleUrls: ['./shopping-list.component.css']
})
export class ShoppingListComponent implements OnInit {
  products: Product[];

  constructor(private dialog: MatDialog, private productService: ProductService) { }

  ngOnInit(): void {
    this.products = this.productService.getProducts();
  }

  openAddProductDialog(): void {
    const dialogRef = this.dialog.open(AddProductDialogComponent, {
      width: '500px'
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        this.productService.addProduct(result);
        this.products = this.productService.getProducts();
      }
    });
  }
}

add-product-dialog.component.ts:

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { MatDialogRef } from '@angular/material/dialog';

@Component({
  selector: 'app-add-product-dialog',
  templateUrl: './add-product-dialog.component.html',
  styleUrls: ['./add-product-dialog.component.css']
})
export class AddProductDialogComponent implements OnInit {
  form: FormGroup;

  constructor(private formBuilder: FormBuilder, private dialogRef: MatDialogRef<AddProductDialogComponent>) { }

  ngOnInit(): void {
    this.form = this.formBuilder.group({
      name: ['', Validators.required],
      price: ['', Validators.required]
    });
  }

  onSubmit(): void {
    if (this.form.valid) {
      this.dialogRef.close(this.form.value);
    }
  }
}

add-product-dialog.component.html:

<h2 mat-dialog-title>Add Product</h2>
<form [formGroup]="form" (ngSubmit)="onSubmit()">
  <mat-dialog-content>
    <mat-form-field>
      <input matInput placeholder="Product Name" formControlName="name">
    </mat-form-field>
    <mat-form-field>
      <input matInput placeholder="Price" formControlName="price">
    </mat-form-field>
  </mat-dialog-content>
  <mat-dialog-actions>
    <button mat-button (click)="dialogRef.close()">Cancel</button>
    <button mat-button color="primary" type="submit">Add</button>
  </mat-dialog-actions>
</form>

3. 在展示购物清单时，可以使用 Angular Material 中的表格组件，示例代码如下：

shopping-list.component.html:

<table mat-table [dataSource]="products" class="mat-elevation-z8">
  <ng-container matColumnDef="name">
    <th mat-header-cell *matHeaderCellDef>Name</th>
    <td mat-cell *matCellDef="let product">{{ product.name }}</td>
  </ng-container>
  <ng-container matColumnDef="price">
    <th mat-header-cell *matHeaderCellDef>Price</th>
    <td mat-cell *matCellDef="let product">{{ product.price }}</td>
  </ng-container>
  <ng-container matColumnDef="actions">
    <th mat-header-cell *matHeaderCellDef></th>
    <td mat-cell *matCellDef="let product">
      <button mat-icon-button color="warn" (click)="deleteProduct(product)">
        <mat-icon>delete</mat-icon>
      </button>
    </td>
  </ng-container>
  <tr mat-header-row *matHeaderRowDef="['name', 'price', 'actions']"></tr>
  <tr mat-row *matRowDef="let row; columns: ['name', 'price', 'actions']"></tr>
</table>

4. 在删除商品时，可以使用 Angular Material 中的确认框组件，示例代码如下：

shopping-list.component.ts:

import { MatDialog } from '@angular/material/dialog';
import { MatSnackBar } from '@angular/material/snack-bar';
import { DeleteProductDialogComponent } from '../delete-product-dialog/delete-product-dialog.component';
import { ProductService } from '../services/product.service';

@Component({
  selector: 'app-shopping-list',
  templateUrl: './shopping-list.component.html',
  styleUrls: ['./shopping-list.component.css']
})
export class ShoppingListComponent implements OnInit {
  products: Product[];

  constructor(private dialog: MatDialog, private snackBar: MatSnackBar, private productService: ProductService) { }

  ngOnInit(): void {
    this.products = this.productService.getProducts();
  }

  deleteProduct(product: Product): void {
    const dialogRef = this.dialog.open(DeleteProductDialogComponent, {
      width: '500px',
      data: product
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        this.productService.deleteProduct(product.id);
        this.products = this.productService.getProducts();
        this.snackBar.open('Product deleted', 'OK', {
          duration: 2000
        });
      }
    });
  }
}

delete-product-dialog.component.ts:

import { Component, Inject, OnInit } from '@angular/core';
import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';

@Component({
  selector: 'app-delete-product-dialog',
  templateUrl: './delete-product-dialog.component.html',
  styleUrls: ['./delete-product-dialog.component.css']
})
export class DeleteProductDialogComponent implements OnInit {
  constructor(private dialogRef: MatDialogRef<DeleteProductDialogComponent>, @Inject(MAT_DIALOG_DATA) public data: Product) { }

  ngOnInit(): void {
  }

  onCancel(): void {
    this.dialogRef.close();
  }

  onDelete(): void {
    this.dialogRef.close(true);
  }
}

delete-product-dialog.component.html:

<h2 mat-dialog-title>Delete Product</h2>
<mat-dialog-content>
  Are you sure you want to delete {{ data.name }}?
</mat-dialog-content>
<mat-dialog-actions>
  <button mat-button (click)="onCancel()">Cancel</button>
  <button mat-button color="warn" (click)="onDelete()">Delete</button>
</mat-dialog-actions>

5. 在添加商品时，可以使用 Reactive Forms 来处理表单数据，示例代码如下：

add-product-dialog.component.ts:

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { MatDialogRef } from '@angular/material/dialog';
import { ProductService } from '../services/product.service';

@Component({
  selector: 'app-add-product-dialog',
  templateUrl: './add-product-dialog.component.html',
  styleUrls: ['./add-product-dialog.component.css']
})
export class AddProductDialogComponent implements OnInit {
  form: FormGroup;

  constructor(private formBuilder: FormBuilder, private dialogRef: MatDialogRef<AddProductDialogComponent>, private productService: ProductService) { }

  ngOnInit(): void {
    this.form = this.formBuilder.group({
      name: ['', Validators.required],
      price: ['', Validators.required]
    });
  }

  onSubmit(): void {
    if (this.form.valid) {
      this.productService.addProduct(this.form.value);
      this.dialogRef.close();
    }
  }
}

add-product-dialog.component.html:

<h2 mat-dialog-title>Add Product</h2>
<form [formGroup]="form" (ngSubmit)="onSubmit()">
  <mat-dialog-content>
    <mat-form-field>
      <input matInput placeholder="Product Name" formControlName="name">
    </mat-form-field>
    <mat-form-field>
      <input matInput placeholder="Price" formControlName="price">
    </mat-form-field>
  </mat-dialog-content>
  <mat-dialog-actions>
    <button mat-button (click)="dialogRef.close()">Cancel</button>
    <button mat-button color="primary" type="submit" [disabled]="form.invalid">Add</button>
  </mat-dialog-actions>
</form>

注意，在这个示例中，我们使用了 Reactive Forms 来处理表单数据，需要在模块中导入 ReactiveFormsModule，示例代码如下：

app.module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { MatDialogModule } from '@angular/material/dialog';
import { MatSnackBarModule } from '@angular/material/snack-bar';
import { MatTableModule } from '@angular/material/table';
import { AppComponent } from './app.component';
import { AddProductDialogComponent } from './add-product-dialog/add-product-dialog.component';
import { DeleteProductDialogComponent } from './delete-product-dialog/delete-product-dialog.component';
import { ShoppingListComponent } from './shopping-list/shopping-list.component';

@NgModule({
  declarations: [
    AppComponent,
    ShoppingListComponent,
    AddProductDialogComponent,
    DeleteProductDialogComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    FormsModule,
    ReactiveFormsModule,
    MatDialogModule,
    MatSnackBarModule,
    MatTableModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

以上是一些可以增加的细节，希望对你有所帮助。