Object.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Object.cs / 1 / Object.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  Object 
**
** 
** Object is the root class for all CLR objects.  This class
** defines only the basics.
**
** 
===========================================================*/
 
namespace System { 
    using System;
    using System.Runtime.InteropServices; 
    using System.Runtime.CompilerServices;
    using System.Runtime.ConstrainedExecution;
    using CultureInfo = System.Globalization.CultureInfo;
    using FieldInfo = System.Reflection.FieldInfo; 
    using BindingFlags = System.Reflection.BindingFlags;
    using RemotingException = System.Runtime.Remoting.RemotingException; 
// The Object is the root class for all object in the CLR System. Object 
// is the super class for all other CLR objects and provide a set of methods and low level
// services to subclasses.  These services include object synchronization and support for clone 
// operations.
//
 //This class contains no data and does not need to be serializable
[Serializable()] 
[ClassInterface(ClassInterfaceType.AutoDual)]
[System.Runtime.InteropServices.ComVisible(true)] 
public class Object 
{
    // Creates a new instance of an Object. 
    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
    public Object()
    {
    } 

    // Returns a String which represents the object instance.  The default 
    // for an object is to return the fully qualified name of the class. 
    //
    public virtual String ToString() 
    {
        return GetType().ToString();
    }
 
    // Returns a boolean indicating if the passed in object obj is
    // Equal to this.  Equality is defined as object equality for reference 
    // types and bitwise equality for value types using a loader trick to 
    // replace Equals with EqualsValue for value types).
    // 
    public virtual bool Equals(Object obj)
    {
        return InternalEquals(this, obj);
    } 

    [MethodImplAttribute(MethodImplOptions.InternalCall)] 
    internal static extern bool InternalEquals(Object objA, Object objB); 

    public static bool Equals(Object objA, Object objB) 
    {
        if (objA==objB) {
            return true;
        } 
        if (objA==null || objB==null) {
            return false; 
        } 
        return objA.Equals(objB);
    } 

    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
    public static bool ReferenceEquals (Object objA, Object objB) {
        return objA == objB; 
    }
 
    // GetHashCode is intended to serve as a hash function for this object. 
    // Based on the contents of the object, the hash function will return a suitable
    // value with a relatively random distribution over the various inputs. 
    //
    // The default implementation returns the sync block index for this instance.
    // Calling it on the same object multiple times will return the same value, so
    // it will technically meet the needs of a hash function, but it's less than ideal. 
    // Objects (& especially value classes) should override this method.
    // 
    public virtual int GetHashCode() 
    {
        return InternalGetHashCode(this); 
    }

    [MethodImplAttribute(MethodImplOptions.InternalCall)]
    internal static extern int InternalGetHashCode(Object obj); 

    // Returns a Type object which represent this object instance. 
    // 
    [MethodImplAttribute(MethodImplOptions.InternalCall)]
    public extern Type GetType(); 

    // Allow an object to free resources before the object is reclaimed by the GC.
    //
    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
    ~Object()
    { 
    } 

    // Returns a new object instance that is a memberwise copy of this 
    // object.  This is always a shallow copy of the instance. The method is protected
    // so that other object may only call this method on themselves.  It is entended to
    // support the ICloneable interface.
    // 
    [MethodImplAttribute(MethodImplOptions.InternalCall)]
    protected extern Object MemberwiseClone(); 
 

    // Sets the value specified in the variant on the field 
    //
    private void FieldSetter(String typeName, String fieldName, Object val)
    {
        // Extract the field info object 
        FieldInfo fldInfo = GetFieldInfo(typeName, fieldName);
 
        if (fldInfo.IsInitOnly) 
            throw new FieldAccessException(Environment.GetResourceString("FieldAccess_InitOnly"));
 
        // Make sure that the value is compatible with the type
        // of field
        System.Runtime.Remoting.Messaging.Message.CoerceArg(val, fldInfo.FieldType);
 
        // Set the value
        fldInfo.SetValue(this, val); 
    } 

    // Gets the value specified in the variant on the field 
    //
    private void FieldGetter(String typeName, String fieldName, ref Object val)
    {
        // Extract the field info object 
        FieldInfo fldInfo = GetFieldInfo(typeName, fieldName);
 
        // Get the value 
        val = fldInfo.GetValue(this);
    } 

    // Gets the field info object given the type name and field name.
    //
    private FieldInfo GetFieldInfo(String typeName, String fieldName) 
    {
        Type t = GetType(); 
        while(null != t) 
        {
            if(t.FullName.Equals(typeName)) 
            {
                break;
            }
 
            t = t.BaseType;
        } 
 
        if (null == t)
        { 
            throw new RemotingException(String.Format(
                CultureInfo.CurrentCulture, Environment.GetResourceString("Remoting_BadType"),
                                              typeName));
        } 

        FieldInfo fldInfo = t.GetField(fieldName, BindingFlags.Public | 
                                                  BindingFlags.Instance | 
                                                  BindingFlags.IgnoreCase);
        if(null == fldInfo) 
        {
            throw new RemotingException(String.Format(
                CultureInfo.CurrentCulture, Environment.GetResourceString("Remoting_BadField"),
                                              fieldName, typeName)); 
        }
 
        return fldInfo; 
    }
} 


// Internal methodtable used to instantiate the "canonical" methodtable for generic instantiations.
// The name "__Canon" will never been seen by users but it will appear a lot in debugger stack traces 
// involving generics so it is kept deliberately short as to avoid being a nuisance.
 
[Serializable()] 
[ClassInterface(ClassInterfaceType.AutoDual)]
[System.Runtime.InteropServices.ComVisible(true)] 
internal class __Canon
{
}
 
}

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