System.Array不包含“任何"的定义-C# [英] System.Array does not contain a definition for 'Any' - C#
问题描述
使用Visual Basic//C#
Using Visual Basic // C#
我正在尝试通过存储的数组搜索与用户输入匹配的内容. 例如，用户已经为USB存储了数据，现在希望备份该信息.
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.
下面的完整代码
我已经在使用IndexOf来查找数组索引，但是现在我想在该索引中搜索与用户输入的匹配项. 这行代码:
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:
if (ProductNameArray.Any(usersearch.Contains))
提出了
System.Array不包含任何"的定义
System.Array does not contain a definition for 'Any'
但是它对我来说已经在其他代码中起作用了.
but it has worked in other code for me.
我似乎无法解决这个问题，感谢您的帮助.
I cannot seem to figure this out, any help is appreciated.
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.");
}
推荐答案
您需要using System.Linq;才能正常工作.
Any 是LINQ中定义的扩展方法.
Any is an extension method defined in LINQ.
此外，请注意ProductNameArray的类型.如果将其定义为Array(而不是例如string[])，则编译器无法推断出枚举时将产生string s的方法.
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.
在这种情况下，您必须编写:
In that case, you'd have to write:
if (ProductNameArray.Cast<string>().Any(usersearch.Contains))
好吧，看一下代码，似乎问题是上述问题.
OK, looking at the code it seems that the problem is the one described above.
您必须从
static void FindProduct(Array ProductNameArray)
到
static void FindProduct(string[] ProductNameArray)
或使用.Cast<string>方法.
我个人更喜欢更改方法的签名，因为传递给它的ProductNameArray似乎确实是string[].
I'd personally prefer changing the method's signature, since the ProductNameArray passed to it seems to really be a string[].
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