INullableValue

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Exam 70-536 Study Guide

1. Types and collections Manage data Manage collections Generic collections Specialized collections Implement interfaces IComparable IDisposable IConvertible ICloneable INullableValue IEquatable IFormattable Events and delegates 2. Process, threading,… 3. Embedding features 4. Serialization, I/O 5. .NET Security 6. Interop., reflection,… 7. Global., drawing, text

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Contents 1 Syntax 1.1 Declaration syntax 1.2 Method syntax 2 INullableValue work around

The System.INullableValue interface defines the fundamental value and existence properties for nullable types. However, it has been removed from .NET 2.0; because, nullables are now an intrinsic type in the CLR.

Syntax

Declaration syntax

[ComVisibleAttribute(true)] 
public interface INullableValue

Method syntax

The INullableValue interface defines the following methods:

• The HasValue method indicates whether a nullable type has a defined value.

bool HasValue { get; }

• The Value method gets the value of the nullable type.

Object Value { get; }

INullableValue work around

Instead, code like the following may be used:

if (t.IsGenericType() && 
   (t.GetGenericTypeDefinition() 
      == typeof(System.Nullable<>))
{ }