配列にC＃で指定された条件に一致する要素が含まれているかどうかを確認します

配列に特定の条件に一致する要素が含まれているかどうかを確認するには、C＃でStartsWith（）メソッドを使用できます-

例

using System;
public class Demo {
   public static void Main(){
      string[] products = { "Electronics", "Accessories", "Clothing", "Toys", "Clothing", "Furniture" };
      Console.WriteLine("Products list...");
      foreach(string s in products){
         Console.WriteLine(s);
      }
      Console.WriteLine("\nOne or more products begin with the letter 'C'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("C")));
      Console.WriteLine("One or more planets begin with 'D'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("D")));
      Console.WriteLine("One or more products begin with the letter 'T'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("T")));
      Console.WriteLine("One or more planets begin with 'E'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("E")));
   }
}

出力

これにより、次の出力が生成されます-

Products list...
Electronics
Accessories
Clothing
Toys
Clothing
Furniture
One or more products begin with the letter 'C'? = True
One or more planets begin with 'D'? = False
One or more products begin with the letter 'T'? = True
One or more planets begin with 'E'? = True

例

別の例を見てみましょう-

using System;
public class Demo {
   public static void Main(){
      string[] products = { "Electronics", "Accessories", "Clothing", "Toys", "Clothing", "Furniture" };
      Console.WriteLine("Products list...");
      foreach(string s in products){
         Console.WriteLine(s);
      }
      Console.WriteLine("Is the products Accessories in the array? = {0}",
      Array.Exists(products, ele => ele == "Accessories"));
      Console.WriteLine("Is the products Stationery in the array? = {0}",
      Array.Exists(products, ele => ele == "Stationery"));
      Console.WriteLine("\nOne or more products begin with the letter 'C'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("C")));
      Console.WriteLine("One or more planets begin with 'D'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("D")));
      Console.WriteLine("One or more products begin with the letter 'T'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("T")));
      Console.WriteLine("One or more planets begin with 'E'? = {0}",
      Array.Exists(products, ele => ele.StartsWith("E")));
   }
}

出力

これにより、次の出力が生成されます-

Products list...
Electronics
Accessories
Clothing
Toys
Clothing
Furniture
Is the products Accessories in the array? = True
Is the products Stationery in the array? = False
One or more products begin with the letter 'C'? = True
One or more planets begin with 'D'? = False
One or more products begin with the letter 'T'? = True
One or more planets begin with 'E'? = True