# Guid.Empty Pole

## Definice

Instance jen pro čtení Guid struktury, jejíž hodnota je všechny nuly.A read-only instance of the Guid structure whose value is all zeros.

``public: static initonly Guid Empty;``
``public static readonly Guid Empty;``
`` staticval mutable Empty : Guid``
``Public Shared ReadOnly Empty As Guid ``

Guid

## Poznámky

Identifikátor GUID můžete porovnat s hodnotou Guid.Empty pole, abyste zjistili, jestli GUID není nula.You can compare a GUID with the value of the Guid.Empty field to determine whether a GUID is non-zero. Následující příklad používá Equality operátor k porovnání dvou hodnot GUID s Guid.Empty a určuje, zda se skládají výhradně z nul.The following example uses the Equality operator to compare two GUID values with Guid.Empty to determine whether they consist exclusively of zeros.

``````// Create a GUID and determine whether it consists of all zeros.
Guid guid1 = Guid.NewGuid();
Console.WriteLine(guid1);
Console.WriteLine(\$"Empty: {guid1 == Guid.Empty}\n");

// Create a GUID with all zeros and compare it to Empty.
var bytes = new Byte[16];
var guid2 = new Guid(bytes);
Console.WriteLine(guid2);
Console.WriteLine(\$"Empty: {guid2 == Guid.Empty}");

// The example displays output like the following:
//       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
//       Empty: False
//
//       00000000-0000-0000-0000-000000000000
//       Empty: True
``````
``````Module Example
Public Sub Main()
' Create a GUID and determine whether it consists of all zeros.
Dim guid1 As Guid = Guid.NewGuid
Console.WriteLine(guid1)
Console.WriteLine("Empty: {0}", guid1 = Guid.Empty)
Console.WriteLine()

' Create a GUID with all zeros and compare it to Empty.
Dim bytes(15) As Byte
Dim guid2 As New Guid(bytes)
Console.WriteLine(guid2)
Console.WriteLine("Empty: {0}", guid2 = Guid.Empty)
End Sub
End Module
' The example displays output like the following:
'       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
'       Empty: False
'
'       00000000-0000-0000-0000-000000000000
'       Empty: True
``````