public void ReturnsTrueForRemovingItem()
{
var data = new Dictionary<string, int> { { "first", 2 }, { "second", 3 } };
bool result = data.Remove("first");
Assert.True(result);
Assert.Equal(2, data.Count);
}
public void ChecksIfAddFunctionWorksAfterRemove()
{
var data = new Dictionary<string, int> { { "first", 2 }, { "second", 3 } };
data.Remove("first");
data.Add("third", 6);
Assert.True(data.ContainsKey("third"));
Assert.False(data.ContainsKey("first"));
}
public void RemovingWorksIfConflictSituationsArise()
{
Dictionary<string, int> d = new Dictionary<string, int> { { "cats", 1 }, { "dogs", 1 }, { "mice", 1 } };
d.Remove("cats");
Assert.False(d.ContainsKey("cats"));
Assert.True(d.ContainsKey("dogs"));
Assert.Equal(2, d.Count);
}
public void IsTrueIfRemovingAnItemWorks()
{
Dictionary<string, int> d = new Dictionary<string, int> { { "cats", 12 }, { "dogs", 13 } , { "mice", 15} };
d.Remove("cats");
Assert.False(d.ContainsKey("cats"));
Assert.True(d.ContainsKey("dogs"));
Assert.Equal(2, d.Count);
}
public void AddWorksAfterRemove()
{
Dictionary<string, int> d = new Dictionary<string, int> { { "cats", 12 }, { "dogs", 13 }, { "mice", 15 } };
d.Remove("cats");
d.Add("bunnies", 19);
Assert.False(d.ContainsKey("cats"));
Assert.True(d.ContainsKey("dogs"));
Assert.True(d.ContainsKey("bunnies"));
Assert.Equal(3, d.Count);
}
static void Main(string[] args)
{
Dictionary<string, string> phonebook = new Dictionary<string, string>();
phonebook["John Smith"] = "+1 - 455-7888"; // key , value
phonebook["Lisa Liska"] = "+1- 887-8999";
phonebook["Sam sam "] = "+1- 887-9877";
phonebook["Nakk"] = "+1-675-3422";
phonebook.Remove("John Smith");
foreach ( var entry in phonebook)
{
Console.WriteLine("{0} --> {1}",entry.Key,entry.Value); //entry.Key, entry.Value
}
Console.ReadLine();
}
static void Main(string[] args)
{
var namesAndAges = new Dictionary<string, int>/*(StringComparer.CurrentCultureIgnoreCase)*/
{
{"Jeremy", 35}
};
namesAndAges.Add("Josh", 25);
namesAndAges["Kristin"] = 39;
//namesAndAges.Add("Jeremy", 30); // an exception
namesAndAges["Jeremy"] = 30;
if (namesAndAges.ContainsKey("Caleb"))
{
var foo = namesAndAges["Caleb"]; //
}
foreach (var kvp in namesAndAges)
{
//kvp.Key
//kvp.Value
}
foreach (var key in namesAndAges.Keys)
{
}
foreach (var value in namesAndAges.Values)
{
}
var count = namesAndAges.Count;
if (namesAndAges.ContainsKey("Josh"))
{
namesAndAges.Remove("Josh");
}
namesAndAges.Clear();
Console.ReadLine();
}
void Run()
{
Dictionary<int, int> myDict = new Dictionary<int, int>();
myDict.Add(0, 1);
myDict.Add(1, 2);
myDict.Add(2, 3);
myDict.Add(3, 4);
Console.WriteLine("Now it should print false");
Console.WriteLine(myDict.ContainsKey(4));
Console.WriteLine("Now it should print true");
Console.WriteLine(myDict.ContainsKey(3));
myDict.Remove(3);
Console.WriteLine("Now it should print false");
Console.WriteLine(myDict.ContainsKey(3));
Console.WriteLine("Now it should print 2");
Console.WriteLine(myDict[1]);
Dictionary<A, B> myDict2 = new Dictionary<A, B>();
A a1 = new A();
A a2 = new A();
myDict2.Add(a1, new B());
myDict2.Add(a2, new B());
Console.WriteLine("Now it should print false");
Console.WriteLine(myDict2.ContainsKey(new A()));
Console.WriteLine("Now it should print true");
Console.WriteLine(myDict2.ContainsKey(a1));
myDict2.Remove(a1);
Console.WriteLine("Now it should print false");
Console.WriteLine(myDict2.ContainsKey(a1));
Console.WriteLine("Now it should print \"Hello I'm B\"");
myDict2[a2].f();
}
static void Main(string[] args)
{
Dictionary<char, string> certifications = new Dictionary<char, string>();
certifications.Add('P', "Passenger transport");
certifications.Add('H', "Hazardous materials");
certifications.Add('N', "Tank vehicles (liquids in bulk)");
certifications.Add('T', "Double/Triple trailers");
ShowCertifications(certifications);
//search for certfications by key and confirm
string theValue;
//try get value
//uses the out
certifications.TryGetValue('H', out theValue);
Console.WriteLine(theValue);
if (certifications.ContainsKey('P'))
Console.WriteLine("Has certfication 'P'");
//check certification for a specific value and confirm
if (certifications.ContainsValue("Double/Triple trailers"))
Console.WriteLine("Has certification 'T'");
//remove certification 'T' by key.
certifications.Remove('T');
if (!certifications.ContainsValue("Double/Triple trailers"))
Console.WriteLine("No longer has certification 'T'");
//remove all certifications
certifications.Clear();
if (certifications.Count == 0)
Console.WriteLine("All certifications removed");
Console.ReadLine();
}
public static void Main(string[] args)
{
Dictionary<string,int> dict=new Dictionary<string,int>();
dict.Add("one",1);
dict.Add("two",2);
dict.Add("three",3);
dict.Add("four",4);
dict.Remove("one");
Console.WriteLine ("Before contains");
Console.WriteLine(dict.ContainsKey("dsaf"));
Console.WriteLine("Key Value Pairs after Dictionary related operations:\n");
foreach (var pair in dict)
{
Console.WriteLine("{0}, {1}",
pair.Key,
pair.Value);
}
dict.Clear ();
List<string> strList = new List<string> ();
strList.Add ("one");
strList.Add ("two");
strList.Add ("three");
strList.Add ("four");
strList.Add ("five");
strList.Insert (3, "great");
string[] newList = new string[3]{ "ten", "eleven", "twelve" };
strList.AddRange (newList);
strList.InsertRange (3, newList);
Console.WriteLine ("Output after all list related operations i.e. add, insert, addrange, insertrange,remove\n");
Console.WriteLine ("The list");
foreach (var i in strList)
Console.WriteLine (i);
}
public void ThrowsExceptionForNonExistentKey()
{
var data = new Dictionary<string, int> { { "first", 2 }, { "second", 3 } };
Exception ex = Assert.Throws<NullReferenceException>(() => data.Remove("third"));
Assert.Equal("Key does not exist.", ex.Message);
}
