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    <p>To manually set the value of product attributes on a product variant you can use the helper methods found in :</p> <ul> <li><code>NopSolutions.NopCommerce.BusinessLogic.Products.ProductManager</code></li> <li><code>NopSolutions.NopCommerce.BusinessLogic.Products.Attributes.ProductAttributeManager</code></li> <li><code>NopSolutions.NopCommerce.BusinessLogic.Products.Attributes.ProductAttributeHelper</code></li> <li><code>NopSolutions.NopCommerce.BusinessLogic.Orders.ShoppingCartManager</code></li> </ul> <p>(this presumes your project is based on the normal nopCommerce example site.)</p> <p>The process is fairly straight forward however; I assume the product attributes are of type TextBox in the nopCommerce catalog. This allows any string to be set as the value of the attribute.</p> <p><strong>Overview of process</strong></p> <ol> <li>Get the product variant, this assumes you already know the product Id and which variant of the product you want (if you have more than one).</li> <li>Get the attributes for the variant.</li> <li>Use ProductAttributeHelper to generate your attribute XML string</li> <li>Save the product to the cart with these attributes.</li> </ol> <p><strong>Example code</strong></p> <pre><code>private bool SaveProductToBasket() { var product = GetTheProduct(); int productId = product.ProductId; var variants = ProductManager.GetProductVariantsByProductId(productId); int variantId = GetDesiredVariantId(); var variant = variants[variantId]; var attributes = ProductAttributeManager.GetProductVariantAttributesByProductVariantId(variant.ProductVariantId); string data = string.Empty; data = SetVariantAttribute(data, attributes, "Attribute1", value1.ToString()); data = SetVariantAttribute(data, attributes, "Attribute2", value2.ToString()); data = SetVariantAttribute(data, attributes, "Attributee", value3.ToString()); var addToCartWarnings = ShoppingCartManager.AddToCart(ShoppingCartTypeEnum.ShoppingCart, variant.ProductVariantId, data, decimal.Zero, 1); if (addToCartWarnings.Count == 0) { return true; } // TODO: Bind warnings. return false; } private string SetVariantAttribute(string data, ProductVariantAttributeCollection attributes, string attributeName, string value) { var attribute = (from a in attributes where a.ProductAttribute.Name == attributeName select a).First(); return ProductAttributeHelper.AddProductAttribute(data, attribute, value); } </code></pre>
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