C# String Join(String, IEnumerable)

Description

String Join(String, IEnumerable <t>)concatenates the members of a collection, using the specified separator between each member.

Syntax

String.Join<T>(String, IEnumerable<T>) has the following syntax.

[ComVisibleAttribute(false)]// w w  w  .j  a  v a2  s .com
public static string Join<T>(
  string separator,
  IEnumerable<T> values
)

Parameters

String.Join<T>(String, IEnumerable<T>) has the following parameters.

• T - The type of the members of values.
• separator - The string to use as a separator. separator is included in the returned string only if values has more than one element.
• values - A collection that contains the objects to concatenate.

Returns

String.Join<T>(String, IEnumerable<T>) method returns A string that consists of the members of values delimited by the separator string. If values has no members, the method returns String.Empty.

Example

This method is particular useful with Language-Integrated Query (LINQ) query expressions.

using System;/*ww  w.  ja  v  a2  s  .co  m*/
using System.Collections.Generic;
using System.Linq;

public class Animal
{
   public string Kind;
   public string Order;

   public Animal(string kind, string order)
   {
      this.Kind = kind;
      this.Order = order;
   }

   public override string ToString()
   {
      return this.Kind;
   }
}

public class Example
{
   public static void Main()
   {
      List<Animal> animals = new List<Animal>();
      animals.Add(new Animal("Squirrel", "Rodent"));
      animals.Add(new Animal("Gray Wolf", "Carnivora"));
      string output = String.Join(" ", animals.Where( animal => (animal.Order == "Rodent")));
      Console.WriteLine(output);  
   }
}

The code above generates the following result.