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Showing posts with label Asp.Net C#. Show all posts
Showing posts with label Asp.Net C#. Show all posts
Tuesday, 27 March 2018
Sunday, 11 February 2018
Difference between == and .Equals method in c#
For Value Type:
== and .Equals() method usually compare two objects by value.
For Example:
int x = 20;
int y = 20;
Console.WriteLine( x == y);
Console.WriteLine(x.Equals(y));
Output:
True
True
For Reference Type:
== performs an identity comparison,
i.e. it will only return true
if both references point to the same object.
While Equals() method is expected to
perform a value comparison, i.e. it will
return true if the references point
to objects that are equivalent.
For Example:
StringBuilder s1 = new StringBuilder(“Yes”);
StringBuilder s2 = new StringBuilder(“Yes”);
Console.WriteLine(s1 == s2);
Console.WriteLine(s1.Equals(s2));
Output:
False
True
In above example, s1 and s2 are different objects hence “==” returns
false, but they are equivalent hence “Equals()”
method returns true. Remember there is an exception of this rule,
i.e. when you use “==” operator with string class it
compares value rather than identity.
When to use “==” operator and when to use “.Equals()” method?
For value comparison, with Value Type use “==” operator
and use “Equals()” method while performing value comparison
with Reference Type.
== and .Equals() method usually compare two objects by value.
For Example:
int x = 20;
int y = 20;
Console.WriteLine( x == y);
Console.WriteLine(x.Equals(y));
Output:
True
True
For Reference Type:
== performs an identity comparison,
i.e. it will only return true
if both references point to the same object.
While Equals() method is expected to
perform a value comparison, i.e. it will
return true if the references point
to objects that are equivalent.
For Example:
StringBuilder s1 = new StringBuilder(“Yes”);
StringBuilder s2 = new StringBuilder(“Yes”);
Console.WriteLine(s1 == s2);
Console.WriteLine(s1.Equals(s2));
Output:
False
True
In above example, s1 and s2 are different objects hence “==” returns
false, but they are equivalent hence “Equals()”
method returns true. Remember there is an exception of this rule,
i.e. when you use “==” operator with string class it
compares value rather than identity.
When to use “==” operator and when to use “.Equals()” method?
For value comparison, with Value Type use “==” operator
and use “Equals()” method while performing value comparison
with Reference Type.
Return Multiple values from a function in C#
In C#, There are 4 ways to return multiple values from a C# function.
- Using KeyValue pair
- Using ref/out parameters
- Using Struct or Class
- Using Tuple
1. Using KeyValue pair:
class Program
{
static void Main(string[] args)
{
int int1 = 15;
int int2 = 25;
var result = Add_Multiply(int1, int2);
Console.WriteLine(result.Key);
Console.WriteLine(result.Value);
}
private static KeyValuePair<int, int> Add_Multiply(int int1, int int2)
{
var KeyValuePair = new KeyValuePair<int, int>(int1 + int2, int1 * int2);
return KeyValuePair;
}
}
Output:
40
375
375
2.a. Using Ref Parameter:
class Program
{
static void Main(string[] args)
{
int int1 = 15;
int int2 = 25;
int add = 0;
int multiply = 0;
Add_Multiply(int1, int2, ref add, ref multiply);
Console.WriteLine(add);
Console.WriteLine(multiply);
}
private static void Add_Multiply(int int1, int int2, ref int add, ref int multiply)
{
add = int1 + int2;
multiply = int1 * int2;
}
}
40
375
375
2.b. Using Out Parameter:
class Program
{
static void Main(string[] args)
{
int int1 = 15;
int int2 = 25;
int add = 0;
int multiply = 0;
Add_Multiply(int1, int2, out add, out multiply);
Console.WriteLine(add);
Console.WriteLine(multiply);
}
private static void Add_Multiply(int int1, int int2, out int add, out int multiply)
{
add = int1 + int2;
multiply = int1 * int2;
}
}
Output:
40
375
375
3.a. Using Struct:
class Program
{
struct Result
{
public int add;
public int multiply;
}
static void Main(string[] args)
{
int int1 = 53;
int int2 = 17;
var result = Add_Multiply(int1, int2);
Console.WriteLine(result.add);
Console.WriteLine(result.multiply);
}
private static Result Add_Multiply(int int1, int int2)
{
var result = new Result
{
add = int1 + int2,
multiply = int1 * int2
};
return result;
}
}
Output:
70
901
901
3.b. Using Class:
struct Result
{
public int add;
public int multiply;
}
static void Main(string[] args)
{
int int1 = 13;
int int2 = 27;
var result = Add_Multiply(int1, int2);
Console.WriteLine(result.add);
Console.WriteLine(result.multiply);
}
private static Result Add_Multiply(int int1, int int2)
{
var result = new Result
{
add = int1 + int2,
multiply = int1 * int2
};
return result;
}
}
Output:
40
351
351
4. Using Tuple:
class Program
{
static void Main(string[] args)
{
int int1 = 25;
int int2 = 28;
var result = Add_Multiply(int1, int2);
Console.WriteLine(result.Item1);
Console.WriteLine(result.Item2);
}
private static Tuple<int, int> Add_Multiply(int int1, int int2)
{
var tuple = new Tuple<int, int>(int1 + int2, int1 * int2);
return tuple;
}
}
Remove Duplicate characters from String in C#
class Program
{
static void Main()
{
string value1 = RemoveDuplicateChars("Csharpstar");
string value2 = RemoveDuplicateChars("Google");
string value3 = RemoveDuplicateChars("Yahoo");
string value4 = RemoveDuplicateChars("CNN");
string value5 = RemoveDuplicateChars("Line1\nLine2\nLine3");
Console.WriteLine(value1);
Console.WriteLine(value2);
Console.WriteLine(value3);
Console.WriteLine(value4);
Console.WriteLine(value5);
}
static string RemoveDuplicateChars(string key)
{
// --- Removes duplicate chars using string concats. ---
// Store encountered letters in this string.
string table = "";
// Store the result in this string.
string result = "";
// Loop over each character.
foreach (char value in key)
{
// See if character is in the table.
if (table.IndexOf(value) == -1)
{
// Append to the table and the result.
table += value;
result += value;
}
}
return result;
}
}
Input: Google
Output: Gogle
Output: Gogle
Saturday, 16 December 2017
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