// Uses the foreach statement which hides the complexity of the enumerator.
// NOTE: The foreach statement is the preferred way of enumerating the contents of a collection.
public static void PrintKeysAndValues1(ShortStringDictionary myCol)
{
foreach (DictionaryEntry myDE in myCol)
{
Console.WriteLine(" {0,-5} : {1}", myDE.Key, myDE.Value);
}
Console.WriteLine();
}
// Uses the Keys property and the Item property.
public static void PrintKeysAndValues3(ShortStringDictionary myCol)
{
ICollection myKeys = myCol.Keys;
foreach (String k in myKeys)
{
Console.WriteLine(" {0,-5} : {1}", k, myCol[k]);
}
Console.WriteLine();
}
public static void Main()
{
// Creates and initializes a new DictionaryBase.
ShortStringDictionary mySSC = new ShortStringDictionary();
// Adds elements to the collection.
mySSC.Add("One", "a");
mySSC.Add("Two", "ab");
mySSC.Add("Three", "abc");
mySSC.Add("Four", "abcd");
mySSC.Add("Five", "abcde");
// Display the contents of the collection using foreach. This is the preferred method.
Console.WriteLine("Contents of the collection (using foreach):");
PrintKeysAndValues1(mySSC);
// Display the contents of the collection using the enumerator.
Console.WriteLine("Contents of the collection (using enumerator):");
PrintKeysAndValues2(mySSC);
// Display the contents of the collection using the Keys property and the Item property.
Console.WriteLine("Initial contents of the collection (using Keys and Item):");
PrintKeysAndValues3(mySSC);
// Tries to add a value that is too long.
try {
mySSC.Add("Ten", "abcdefghij");
}
catch (ArgumentException e) {
Console.WriteLine(e.ToString());
}
// Tries to add a key that is too long.
try {
mySSC.Add("Eleven", "ijk");
}
catch (ArgumentException e) {
Console.WriteLine(e.ToString());
}
Console.WriteLine();
// Searches the collection with Contains.
Console.WriteLine("Contains \"Three\": {0}", mySSC.Contains("Three"));
Console.WriteLine("Contains \"Twelve\": {0}", mySSC.Contains("Twelve"));
Console.WriteLine();
// Removes an element from the collection.
mySSC.Remove("Two");
// Displays the contents of the collection.
Console.WriteLine("After removing \"Two\":");
PrintKeysAndValues1(mySSC);
}
static void Main(string[] args)
{
//Creates and initializes a new Diction aryBase.
ShortStringDictionary mySSC = new ShortStringDictionary();
//Adds elements to the collection.
mySSC.Add("One", "a");
//增加更多的项目到集合中
Console.WriteLine("Initial contents of the collection :");
PrintKeysAndValues(mySSC);
}
// Uses the enumerator.
// NOTE: The foreach statement is the preferred way of enumerating the contents of a collection.
public static void PrintKeysAndValues2(ShortStringDictionary myCol)
{
DictionaryEntry myDE;
System.Collections.IEnumerator myEnumerator = myCol.GetEnumerator();
while (myEnumerator.MoveNext())
{
if (myEnumerator.Current != null)
{
myDE = (DictionaryEntry)myEnumerator.Current;
Console.WriteLine(" {0,-5} : {1}", myDE.Key, myDE.Value);
}
}
Console.WriteLine();
}
public static void Main()
{
DictionaryBase myDictionary = new ShortStringDictionary();
// <Snippet2>
foreach (DictionaryEntry de in myDictionary)
{
//...
}
// </Snippet2>
// <Snippet3>
ICollection myCollection = new ShortStringDictionary();
lock (myCollection.SyncRoot)
{
foreach (Object item in myCollection)
{
// Insert your code here.
}
}
// </Snippet3>
}
