Type.GetHashCode Method

Reference

Definition

Namespace:: System

Assemblies:: mscorlib.dll, System.Runtime.dll

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Type.cs

Source:: Type.cs

Source:: Type.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Returns the hash code for this instance.

public:
 override int GetHashCode();

public override int GetHashCode();

override this.GetHashCode : unit -> int

Public Overrides Function GetHashCode () As Integer

Returns

Int32

The hash code for this instance.

Implements

GetHashCode()

Examples

The following example displays the hash code of the System.Windows.Forms.Button class.

#using <system.dll>
#using <system.windows.forms.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Security;
using namespace System::Reflection;

int main()
{
   Type^ myType = System::Net::IPAddress::typeid;
   array<FieldInfo^>^myFields = myType->GetFields( static_cast<BindingFlags>(BindingFlags::Static | BindingFlags::NonPublic) );
   Console::WriteLine( "\nThe IPAddress class has the following nonpublic fields: " );
   System::Collections::IEnumerator^ myEnum = myFields->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      FieldInfo^ myField = safe_cast<FieldInfo^>(myEnum->Current);
      Console::WriteLine( myField );
   }

   Type^ myType1 = System::Net::IPAddress::typeid;
   array<FieldInfo^>^myFields1 = myType1->GetFields();
   Console::WriteLine( "\nThe IPAddress class has the following public fields: " );
   System::Collections::IEnumerator^ myEnum2 = myFields1->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      FieldInfo^ myField = safe_cast<FieldInfo^>(myEnum2->Current);
      Console::WriteLine( myField );
   }

   try
   {
      Console::WriteLine( "The HashCode of the System::Windows::Forms::Button type is: {0}", System::Windows::Forms::Button::typeid->GetHashCode() );
   }
   catch ( SecurityException^ e ) 
   {
      Console::WriteLine( "An exception occurred." );
      Console::WriteLine( "Message: {0}", e->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "An exception occurred." );
      Console::WriteLine( "Message: {0}", e->Message );
   }
}

using System;
using System.Security;
using System.Reflection;

class FieldsSample
{
    public static void Main()						
    {
        Type myType = typeof(System.Net.IPAddress);
        FieldInfo [] myFields = myType.GetFields(BindingFlags.Static | BindingFlags.NonPublic);
        Console.WriteLine ("\nThe IPAddress class has the following nonpublic fields: ");
        foreach (FieldInfo myField in myFields)
        {
            Console.WriteLine(myField.ToString());
        }
        Type myType1 = typeof(System.Net.IPAddress);
        FieldInfo [] myFields1 = myType1.GetFields();
        Console.WriteLine ("\nThe IPAddress class has the following public fields: ");
        foreach (FieldInfo myField in myFields1)
        {
            Console.WriteLine(myField.ToString());
        }
        try
        {
            Console.WriteLine("The HashCode of the System.Windows.Forms.Button type is: {0}",
                typeof(System.Windows.Forms.Button).GetHashCode());
        }		
        catch(SecurityException e)
        {
            Console.WriteLine("An exception occurred.");
            Console.WriteLine("Message: "+e.Message);
        }
        catch(Exception e)
        {
            Console.WriteLine("An exception occurred.");
            Console.WriteLine("Message: "+e.Message);
        }		
    }
}

open System.Security
open System.Reflection

let myType = typeof<System.Net.IPAddress>
let myFields = myType.GetFields(BindingFlags.Static ||| BindingFlags.NonPublic)
printfn "\nThe IPAddress class has the following nonpublic fields: "
for myField in myFields do
    printfn $"{myField}"
let myType1 = typeof<System.Net.IPAddress>
let myFields1 = myType1.GetFields()
printfn "\nThe IPAddress class has the following public fields: "
for myField in myFields1 do
    printfn $"{myField}"
try
    printfn $"The HashCode of the System.Windows.Forms.Button type is: {typeof<System.Windows.Forms.Button>.GetHashCode()}"
with
| :? SecurityException as e ->
    printfn "An exception occurred."
    printfn $"Message: {e.Message}"
| e ->
    printfn "An exception occurred."
    printfn $"Message: {e.Message}"

Imports System.Security
Imports System.Reflection

' Compile this sample using the following command line:
' vbc type_gethashcode_getfields.vb /r:"System.Windows.Forms.dll" /r:"System.dll"

Class FieldsSample

    Public Shared Sub Main()
        Dim myType As Type = GetType(System.Net.IPAddress)
        Dim myFields As FieldInfo() = myType.GetFields((BindingFlags.Static Or BindingFlags.NonPublic))
        Console.WriteLine(ControlChars.Lf & "The IPAddress class has the following nonpublic fields: ")
        Dim myField As FieldInfo
        For Each myField In myFields
            Console.WriteLine(myField.ToString())
        Next myField
        Dim myType1 As Type = GetType(System.Net.IPAddress)
        Dim myFields1 As FieldInfo() = myType1.GetFields()
        Console.WriteLine(ControlChars.Lf & "The IPAddress class has the following public fields: ")
        Dim myField1 As FieldInfo
        For Each myField1 In myFields1
            Console.WriteLine(myField.ToString())
        Next myField1
        Try
            Console.WriteLine("The HashCode of the System.Windows.Forms.Button type is: {0}", GetType(System.Windows.Forms.Button).GetHashCode())
        Catch e As SecurityException
            Console.WriteLine("An exception occurred.")
            Console.WriteLine(("Message: " & e.Message))
        Catch e As Exception
            Console.WriteLine("An exception occurred.")
            Console.WriteLine(("Message: " & e.Message))
        End Try
    End Sub
End Class

Remarks

This method overrides Object.GetHashCode.

Applies to

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