如何使用 HttpContext 获取 int 而不是 string 的值？

Question

我有当前行从文本框中请求产品#：

 string[] productNumbers = HttpContext.Current.Request.Form.GetValues("ProductNumber");

我尝试对其进行调整以从 Qty 中获取值：

 int[] qty = HttpContext.Current.Request.Form.GetValues("quantity_input");

但是我收到一个错误，它无法将字符串转换为 int。那么我怎样才能使用这个去获得一个 Int 呢？我只是想抓住它。

“CS0029：无法将类型'string[]'隐式转换为'int'”

我的完整代码是：

CartItemCollection items = new CartItemCollection();
Cart cart = Core.GetCartObject();
string skus = "";
string debugStr = "";
Product product = null;
int[] qty = HttpContext.Current.Request.Form.GetValues("quantity_input");
try
{
    string[] productNumbers = HttpContext.Current.Request.Form.GetValues("ProductNumber");
    foreach (string productNumber in productNumbers)
    {
        debugStr = debugStr + "-p=" + productNumber;
        if(!string.IsNullOrEmpty(productNumber.Trim()) && !productNumber.StartsWith("Enter Product #"))
        {
            try
            {   //redirect if no product found
                product = Core.GetProductObjectByProductNumber(productNumber);
            }
            catch (Exception e)
            {
                debugStr = debugStr + "-e=noproductfound";
                continue; //do nothing, process the next user input
            }
            //check if we have a valid product object, allow virtual and other type(s) for adding directly to cart which may need special handling
            if(product != null)
            {
                debugStr = debugStr + "-t=" + product.ProductTypeName;
                if(!product.ProductTypeName.Equals("NORMAL"))
                {
                    //assume VIRTUAL (or other type) and redirect for selecting child/group products or other special handling
                    form.Redirect("product.aspx?p=" + product.ProductNumber);
                }
                else
                {
                    debugStr = debugStr + "-a=noattributesadd";
                    CartItem item = new CartItem(context);
                    item.ProductId = product.ProductId;
                    item.Quantity = qty;
                    items.Add(item);
                }
                skus = skus + ";" + productNumber;
                product = null;  //reset the product object in case the next product number submitted is invalid
            }  //product not null
        }  //sanity check for empty or default data
    }  //iterate on each product submitted
    cart.AddItems(items);
    form.Redirect("cart.aspx?skus=" + skus);
}
catch (Exception e)
{
    form.AddError("*** ProductNumber provided was not found ***");
    form.Redirect("quickorder.aspx?qo=2&e=" + e.Message);
    return;
}

Answer 1

那么你将不得不将字符串值转换为整数，例如

List<int> qty = new List<int>();
foreach (string item in HttpContext.Current.Request.Form.GetValues("quantity_input"))
{
    qty.Add(int.Parse(item));
}

如果您想防范非数字值，请使用 TryParse。

Answer 2

它总是会返回一个string[]，你可以使用下面的Linq 语句将string[] 转换为一个int[]。

string[] result = HttpContext.Current.Request.Form.GetValues("quantity_input");
int[] quantityInputs = result.Select(x => int.Parse(x)).ToArray();