Null (In C #) Vs Nothing (at vb.net)

Question

How is C # NULL different from vb.net Nothing?

Console.WriteLine(Nothing = "") => True

against

Console.WriteLine(null==""); => False

I realized that both nulland Nothingthe same. But the above code clearly explains that this is not the case.

What is the C # equivalent nullin VB.NET?

Answer 1

In your code, VB guesses that you are comparing Strings, since one of the operands is String. In comparison it is String Nothingequivalently empty String "". Then it performs a comparison of the values ​​that it returns True.

Use Isto compare links:

Console.WriteLine(Nothing Is "") '=> False

Answer 2

, Nothing vb.net null #

Visual Basic Nothing:

; , . .

Microsoft, , Nothing vb.net default(T) # .

Dim isSomething As Boolean = Nothing ' = False
Dim amount As Integer = Nothing ' = 0
Dim value As String = Nothing ' = null (notice not empty string!)

, , /

Dim value As String = Nothing
If value.Equals("") Then ' will throw NullReferenceException

End If 

Nothing "" "=" vb.net, Nothing null

Visual Basic String:

, , . . , Unicode . , , .NET Framework. ".

vb.net String.Equals Is.

, null, Nothing . , .

, Nothing vb.net default(T) #

# null VB.NET?

# null , (String), # null vb.net, Nothing.
(null == default(String))

Answer 3

. , , . , .

, Nothing VB null #, , ( Nothing). MSDN, null . - VB, # , VB, .

, VB, . VB Nothing , "" MSDN:

Nothing 0. Nothing "" ( ).

, VB? , VB Nothing ( , = , ). null #, . default(T) #. =, VB , Nothing . :

VB Nothing null:

Console.WriteLine(s Is Nothing) //C#: (s == null)

VB Nothing default(T), :

Dim s As String = Nothing //C#: string s = default(string);
Dim i As Integer = Nothing //C#: int i = default(int);

, , VB # . , . VB # true :

Console.WriteLine(5.0 = 5) //C#: (5.0 == 5)

, VB # , . , "" null VB, #. , VB. , , :

Console.WriteLine(s = Nothing)
Console.WriteLine(s = "")

, VB Nothing "" . # , :

Console.WriteLine(s == null && s == "")

, VB , # , . . , , # , ==:

Console.WriteLine(s == null)

VB =, , Is:

Console.WriteLine(s Is Nothing)

, VB , # . , , :

Console.WriteLine(string.IsNullOrEmpty(s))

Answer 4

Nothing VB :  -  - ; null

Answer 5

Microsoft ,

.

, VB.NET :

    Dim myText As String = Nothing
    Dim myInt As Integer = Nothing
    Dim myFloat As Single = Nothing
    Dim myBoolean As Boolean = Nothing
    Dim myDate As DateTime = Nothing

ILSpy, # :

    string myText = null;
    int myInt = 0;
    float myFloat = 0f;
    bool myBoolean = false;
    DateTime myDate = DateTime.MinValue;

VB.NET Nothing literal, .

From # default(Type) VB Nothing