System.Array不包含'Any'的定义 - C＃

Using Visual Basic // C#

使用Visual Basic // C#

I'm trying to search through my stored arrays for a match to the user input. For example, the user has stored the data for a USB, and now wishes to bring that information back up.

我正在尝试搜索我存储的数组以匹配用户输入。例如,用户已经存储了USB的数据,现在希望重新获得该信息。

FULL CODE BELOW

以下完整代码

I'm already using IndexOf to find the array index, but now i want to search that index for a match to the user's input. This line of code:

我已经使用IndexOf来查找数组索引,但现在我想搜索该索引以匹配用户的输入。这行代码:

if (ProductNameArray.Any(usersearch.Contains))

has come up with the error that

我想出了那个错误

System.Array does not contain a definition for 'Any'

System.Array不包含“Any”的定义

but it has worked in other code for me.

但它在我的其他代码中有效。

I cannot seem to figure this out, any help is appreciated.

我似乎无法弄清楚这一点,任何帮助表示赞赏。

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using System.Linq;

namespace Prac_Test3
{


class Program
{
     // Constants
        const int SIZE_OF_PRODUCT_CODE = 4;
        const float CATEGORY_A_MARKUP = 10.0F;
        const float CATEGORY_C_MARKUP = 33.3F;
        const float CATEGORY_P_MARKUP = 15.0F;
        const int ARRAY_SIZE = 100;


    static void DisplayMenu()
    {
        Console.Clear();
        Console.WriteLine("--------------> Menu <------------");
        Console.WriteLine("1. Add a product                (a)");
        Console.WriteLine("2. Find a product               (f)");
        Console.WriteLine("3. Enter the quantity in stock  (q)");
        Console.WriteLine("4. Delete a product             (d)");
        Console.WriteLine("5. Calculate and display values (v)");
        Console.WriteLine("6. Exit                         (x)");
        Console.Write("\r\nEnter your selection: ");
    }
    static void AddProduct( string[] ProductNameArray, string[] ProductCodeArray, float[] WholesalePriceArray, ref int NextAvaliablePosition)
    {
        string ProductName = "";
        string ProductCode = "";
        string ProductCategory = "";

        float WholesalePricePerItem = 0.0F;

        bool ParseResult = false;
        bool ErrorFlag = false;

        string UserResponse = ""; 

        do
        {
            ErrorFlag = false;
            Console.Write("Product Name                : ");
            ProductName = Console.ReadLine();
            if (ProductName == "")
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Product Name must not be left blank.");
                Console.ForegroundColor = ConsoleColor.Gray;
                ErrorFlag = true;
            }
        } while (ErrorFlag);

        do
        {
            ErrorFlag = false;
            Console.Write("Product Code                : ");
            ProductCode = Console.ReadLine();
            if (ProductCode == "")
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Product Name must not be left blank.");
                Console.ForegroundColor = ConsoleColor.Gray;
                ErrorFlag = true;
            }
            else if (ProductCode.Length != SIZE_OF_PRODUCT_CODE)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Product Code must be exactly four characters.");
                Console.ForegroundColor = ConsoleColor.Gray;
                ErrorFlag = true;
            }
            else
            {
                ProductCategory = ProductCode.Substring(0, 1);
                ProductCategory = ProductCategory.ToUpper();
                if (ProductCategory != "A" && ProductCategory != "C" && ProductCategory != "P")
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("Product Code must start with A, C or P.");
                    Console.ForegroundColor = ConsoleColor.Gray;
                    ErrorFlag = true;
                }
                else if (!(Char.IsDigit(ProductCode[1])) && !(Char.IsDigit(ProductCode[2])) && !(Char.IsDigit(ProductCode[3])))
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("Product Code  must be A, C or P followed by three digits.");
                    Console.ForegroundColor = ConsoleColor.Gray;
                    ErrorFlag = true;
                }
            }
        } while (ErrorFlag);

        do
        {
            ErrorFlag = false;
            Console.Write("Wholesale price per item ($): ");
            UserResponse = Console.ReadLine();
            ParseResult = float.TryParse(UserResponse, out WholesalePricePerItem);
            if (ParseResult == false)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Not a valid number.");
                Console.ForegroundColor = ConsoleColor.Gray;
                ErrorFlag = true;
            }
            else if (WholesalePricePerItem <= 0)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Wholesale price must be a number greater than 0.");
                Console.ForegroundColor = ConsoleColor.Gray;
                ErrorFlag = true;
            }
        } while (ErrorFlag);
    }
    static void FindProduct(Array ProductNameArray)
    {

        int search = -1;
        string usersearch;

        usersearch = Console.ReadLine();
        search = Array.IndexOf(ProductNameArray, usersearch);

        if (search >=0)
        {
            if (ProductNameArray.Any(usersearch.Contains))
            {
                Console.WriteLine(" details blah blah");
            }
        }
        else if (search <0)
        {
            Console.WriteLine("No record exists.");
        }

3 个解决方案

#1

You need using System.Linq; for that to work.

你需要使用System.Linq;为了工作。

Any is an extension method defined in LINQ.

Any是LINQ中定义的扩展方法。

Also, pay attention to the type of ProductNameArray. If it is defined as Array (and not string[], for example), the compiler has no way of inferring that, when enumerated, it'll yield strings.

另外,请注意ProductNameArray的类型。如果它被定义为Array(而不是string [],例如),则编译器无法推断枚举时它将产生字符串。

In that case, you'd have to write:

在这种情况下,你必须写:

if (ProductNameArray.Cast<string>().Any(usersearch.Contains))

Edit: OK, looking at the code it seems that the problem is the one described above.

编辑:好的,看看代码似乎问题是上面描述的问题。

You'll have to change the signature of the FindProduct method from

您必须更改FindProduct方法的签名

static void FindProduct(Array ProductNameArray)

static void FindProduct(string[] ProductNameArray)

or use the .Cast<string> method.

或使用.Cast 方法。

I'd personally prefer changing the method's signature, since the ProductNameArray passed to it seems to really be a string[].

我个人更喜欢更改方法的签名,因为传递给它的ProductNameArray似乎真的是一个字符串[]。

#2

Any() is an extension method in System.Linq namespace. You have to add using System.Linq; so that you can use it.

Any()是System.Linq命名空间中的扩展方法。你必须使用System.Linq添加;这样你就可以使用它了。

namespace Your.Namespace
{
    using System;
    using ... // your other usings
    using System.Linq;

    public sealed class YourClass
    {
        public void Test()
        {
            // ...
            yourArray.Any()
        }
    }
}

#3

Add below to you code

在下面添加代码

using System.Linq;

#1