Lazy initialization

Question

I am wondering what is the difference between two constructor overloads of Lazy<T> class.

Lazy(Func, Boolean) - Initializes a new instance of the Lazy class. When lazy initialization occurs, the specified initialization function and initialization mode are used.

Lazy(Func, LazyThreadSafetyMode) - Initializes a new instance of the Lazy class that uses the specified initialization function and thread-safety mode.

Is the second constructor more flexible from the point of thread-safety? Which LazyThreadSafetyMode member is an analogue for Lazy<...>(..., true)?

Matthew Watson · Accepted Answer · 2014-05-05 07:49:39Z

4

From Reflector:

public Lazy(Func<T> valueFactory, bool isThreadSafe) : this(valueFactory, isThreadSafe ?LazyThreadSafetyMode.ExecutionAndPublication : LazyThreadSafetyMode.None)
{
}

So if you pass true it will convert to LazyThreadSafetyMode.ExecutionAndPublication.

false will convert to LazyThreadSafetyMode.None

By the way, if you only pass the value factor (omitting the bool altogether), it uses LazyThreadSafetyMode.ExecutionAndPublication.

edited May 5, 2014 at 7:49

answered May 5, 2014 at 7:41

Matthew Watson

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2 Comments

Ulugbek Umirov Over a year ago

And without resharper/reflector: referencesource.microsoft.com/#mscorlib/system/…

Matthew Watson Over a year ago

@SriramSakthivel Oops, I meant Reflector of course. :) fixed.

chiccodoro · Accepted Answer · 2014-05-05 07:43:22Z

0

If you pass true the object is initialized with the ExecutionAndPublication lazy mode. If you pass false the object is initialized with the None mode.

If you use an overload that does not take a boolean it is initialized with the ExecutionAndPublication mode.

answered May 5, 2014 at 7:43

chiccodoro

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2 Comments

chiccodoro Over a year ago

oh, Matthew was quicker and found out the same way - I used Resharper too but would not dare to post disassembled code here :-)

Matthew Watson Over a year ago

I think it's ok to post it - after all, it's all freely available online here: referencesource.microsoft.com

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