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/ 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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