| private Perf ( bool expr, string msg ) : void | ||
| expr | bool | |
| msg | string | |
| return | void | |
IEnumerator IEnumerable.GetEnumerator()
{
Contract.Ensures(Contract.Result <IEnumerator>() != null);
Contract.EndContractBlock();
BCLDebug.Perf(false, "Avoid using String's CharEnumerator until C# special cases foreach on String - use the indexed property on String instead.");
return(new CharEnumerator(this));
}
/*=================================GetHashCode==================================
**Action: Our algorithm for returning the hashcode is a little bit complex. We look
** for the first non-static field and get it's hashcode. If the type has no
** non-static fields, we return the hashcode of the type. We can't take the
** hashcode of a static member because if that member is of the same type as
** the original type, we'll end up in an infinite loop.
**Returns: The hashcode for the type.
**Arguments: None.
**Exceptions: None.
** ==============================================================================*/
/// <include file='doc\ValueType.uex' path='docs/doc[@for="ValueType.GetHashCode"]/*' />
public override int GetHashCode()
{
// Note that for correctness, we can't use any field of the value type
// since that field may be mutable in some way. If we use that field
// and the value changes, we may not be able to look up that type in a
// hash table. For correctness, we need to use something unique to
// the type of this object.
// HOWEVER, we decided that the perf of returning a constant value (such as
// the hash code for the type) would be too big of a perf hit. We're willing
// to deal with less than perfect results, and people should still be
// encouraged to override GetHashCode.
BCLDebug.Correctness(!(this is System.Collections.DictionaryEntry), "Calling GetHashCode on DictionaryEntry is dumb and probably wrong.");
BCLDebug.Perf(false, "ValueType::GetHashCode is not fast. Perhaps " + this.GetType().FullName + " should override GetHashCode()");
RuntimeType thisType = (RuntimeType)this.GetType();
FieldInfo[] thisFields = thisType.InternalGetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, false);
if (thisFields.Length > 0)
{
for (int i = 0; i < thisFields.Length; i++)
{
Object obj = ((Object)(((RuntimeFieldInfo)thisFields[i]).InternalGetValue((Object)this, false)));
if (obj != null)
{
return(obj.GetHashCode());
}
}
}
// Using the method table pointer is about 4x faster than getting the
// sync block index for the Type object.
return(GetMethodTablePtrAsInt(this));
}
public override bool Equals(Object obj)
{
BCLDebug.Perf(false, "ValueType::Equals is not fast. " + this.GetType().FullName + " should override Equals(Object)");
if (null == obj)
{
return(false);
}
RuntimeType thisType = (RuntimeType)this.GetType();
RuntimeType thatType = (RuntimeType)obj.GetType();
if (thatType != thisType)
{
return(false);
}
Object thisObj = (Object)this;
Object thisResult, thatResult;
// if there are no GC references in this object we can avoid reflection
// and do a fast memcmp
if (CanCompareBits(this))
{
return(FastEqualsCheck(thisObj, obj));
}
FieldInfo[] thisFields = thisType.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
for (int i = 0; i < thisFields.Length; i++)
{
thisResult = ((RtFieldInfo)thisFields[i]).UnsafeGetValue(thisObj);
thatResult = ((RtFieldInfo)thisFields[i]).UnsafeGetValue(obj);
if (thisResult == null)
{
if (thatResult != null)
{
return(false);
}
}
else
if (!thisResult.Equals(thatResult))
{
return(false);
}
}
return(true);
}
IEnumerator IEnumerable.GetEnumerator()
{
BCLDebug.Perf(false, "Avoid using String's CharEnumerator until C# special cases foreach on String - use the indexed property on String instead.");
return(new CharEnumerator(this));
}
