一个简单的例子

NameValueCollection markStatus = new NameValueCollection();
string[] values = null;

markStatus.Add("Very High", "80");
           markStatus.Add("High", "60");
           markStatus.Add("medium", "50");
           markStatus.Add("Pass", "40");

foreach (string key in markStatus.Keys)
           {
               values = markStatus.GetValues(key);
foreach (string value in values)
               {
                   MessageBox.Show (key + " - " + value);
               }
           }

微软网站上的例子

using System;
using System.Collections;
using System.Collections.Specialized;

publicclass SamplesNameValueCollection { publicstaticvoid Main()  {

// Creates and initializes a new NameValueCollection.
     NameValueCollection myCol = new NameValueCollection();
     myCol.Add( "red", "rojo" );
     myCol.Add( "green", "verde" );
     myCol.Add( "blue", "azul" );
     myCol.Add( "red", "rouge" );

// Displays the values in the NameValueCollection in two different ways.
     Console.WriteLine( "Displays the elements using the AllKeys property and the Item (indexer) property:" );
     PrintKeysAndValues( myCol );
     Console.WriteLine( "Displays the elements using GetKey and Get:" );
     PrintKeysAndValues2( myCol );

// Gets a value either by index or by key.
     Console.WriteLine( "Index 1 contains the value {0}.", myCol[1] );
     Console.WriteLine( "Key \"red\" has the value {0}.", myCol["red"] );
     Console.WriteLine();

// Copies the values to a string array and displays the string array.
     String[] myStrArr = new String[myCol.Count];
     myCol.CopyTo( myStrArr, 0 );
     Console.WriteLine( "The string array contains:" );
foreach ( String s in myStrArr )
        Console.WriteLine( "   {0}", s );
     Console.WriteLine();

// Searches for a key and deletes it.
     myCol.Remove( "green" );
     Console.WriteLine( "The collection contains the following elements after removing \"green\":" );
     PrintKeysAndValues( myCol );

// Clears the entire collection.
     myCol.Clear();
     Console.WriteLine( "The collection contains the following elements after it is cleared:" );
     PrintKeysAndValues( myCol );

}

publicstaticvoid PrintKeysAndValues( NameValueCollection myCol )  {
     Console.WriteLine( "   KEY        VALUE" );
foreach ( String s in myCol.AllKeys )
        Console.WriteLine( "   {0,-10} {1}", s, myCol[s] );
     Console.WriteLine();
  }

publicstaticvoid PrintKeysAndValues2( NameValueCollection myCol )  {
     Console.WriteLine( "   [INDEX] KEY        VALUE" );
for ( int i = 0; i < myCol.Count; i++ )
        Console.WriteLine( "   [{0}]     {1,-10} {2}", i, myCol.GetKey(i), myCol.Get(i) );
     Console.WriteLine();
  }

}

/*

This code produces the following output.

Displays the elements using the AllKeys property and the Item (indexer) property:
  KEY        VALUE
  red        rojo,rouge
  green      verde
  blue       azul

Displays the elements using GetKey and Get:
  [INDEX] KEY        VALUE
  [0]     red        rojo,rouge
  [1]     green      verde
  [2]     blue       azul

Index 1 contains the value verde.
Key "red" has the value rojo,rouge.

The string array contains:
  rojo,rouge
  verde
  azul

The collection contains the following elements after removing "green":
  KEY        VALUE
  red        rojo,rouge
  blue       azul

The collection contains the following elements after it is cleared:
  KEY        VALUE

*/