问题描述
我正在将自定义更改从 nopcommerce 4.3 移至 4.4。 nop 4.4 完全是用 async 和 await 方法构建的,我是这种异步等待编码的新手。 当我做简单的方法改变时,我得到了
“未将对象引用设置为对象错误的实例”。
请告诉我如何解决此问题。
var products1 = await _productModelFactory.PrepareProductOverviewmodelsAsync(lst1);
public virtual async Task<WishlistModel> PrepareWishlistModelAsync1(WishlistModel model,IList<ShoppingCartItem> cart,bool isEditable = true)
{
List<Product> lst1 = new List<Product>();
lst1.Add(new Product { Id = 123,Name = "Product 1" });
var products1 = await _productModelFactory.PrepareProductOverviewmodelsAsync(lst1);
return model;
}
public virtual async Task<IEnumerable<ProductOverviewmodel>> PrepareProductOverviewmodelsAsync(IEnumerable<Product> products,bool preparePriceModel = true,bool preparePictureModel = true,int? productThumbPictureSize = null,bool prepareSpecificationAttributes = false,bool forceRedirectionAfteraddingToCart = false)
{
if (products == null)
throw new ArgumentNullException(nameof(products));
var models = new List<ProductOverviewmodel>();
foreach (var product in products)
{
var model = new ProductOverviewmodel
{
Id = product.Id,Name = await _localizationService.GetLocalizedAsync(product,x => x.Name),ShortDescription = await _localizationService.GetLocalizedAsync(product,x => x.ShortDescription),FullDescription = await _localizationService.GetLocalizedAsync(product,x => x.FullDescription),SeName = await _urlRecordService.GetSeNameAsync(product),Sku = product.Sku,ProductType = product.ProductType,MarkAsNew = product.MarkAsNew &&
(!product.MarkAsNewStartDateTimeUtc.HasValue || product.MarkAsNewStartDateTimeUtc.Value < DateTime.UtcNow) &&
(!product.MarkAsNewEndDateTimeUtc.HasValue || product.MarkAsNewEndDateTimeUtc.Value > DateTime.UtcNow)
};
// Customization
if (product.vendorId > 0)
{
var customer = await _customerService.GetCustomerByIdAsync(product.vendorId);
model.FirstName = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.FirstNameAttribute);
model.LastName = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.LastNameAttribute);
model.Phone = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.PhoneAttribute);
model.Gender = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.GenderAttribute);
model.Company = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.CompanyAttribute);
model.CountryId = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.CountryIdAttribute);
model.StateProvinceId = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.StateProvinceIdAttribute);
model.LanguageId = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.LanguageIdAttribute);
model.TimeZoneId = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.TimeZoneIdAttribute);
model.AvatarPictureId = await _genericAttributeService.GetAttributeAsync<string>(customer,nopCustomerDefaults.AvatarPictureIdAttribute);
model.CustomerProfileTypeId = model.FirstName;
}
//price
if (preparePriceModel)
{
model.ProductPrice = await PrepareProductOverviewPriceModelAsync(product,forceRedirectionAfteraddingToCart);
}
//picture
if (preparePictureModel)
{
model.DefaultPictureModel = await PrepareProductOverviewPictureModelAsync(product,productThumbPictureSize);
}
//specs
if (prepareSpecificationAttributes)
{
model.ProductSpecificationModel = await PrepareProductSpecificationModelAsync(product);
}
//reviews
model.ReviewOverviewmodel = await PrepareProductReviewOverviewmodelAsync(product);
models.Add(model);
}
return models;
}
解决方法
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