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class System.Nullable
Assembly: System.Runtime
Inheritance: object → Nullable
Supports a value type that can be assigned <see langword="null" /> . This class cannot be inherited.
Methods
public static
int
Compare(T? n1,
T? n2)
Compares the relative values of two <see cref="T:System.Nullable`1" /> objects.
Returns An integer that indicates the relative values of the <paramref name="n1" /> and <paramref name="n2" /> parameters.
<list type="table">
<listheader>
<term> Return Value</term>
<description> Description</description>
</listheader>
<item>
<term> Less than zero</term>
<description> The <see cref="P:System.Nullable`1.HasValue" /> property for <paramref name="n1" /> is <see langword="false" />, and the <see cref="P:System.Nullable`1.HasValue" /> property for <paramref name="n2" /> is <see langword="true" />, or the <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="true" />, and the value of the <see cref="P:System.Nullable`1.Value" /> property for <paramref name="n1" /> is less than the value of the <see cref="P:System.Nullable`1.Value" /> property for <paramref name="n2" />.</description>
</item>
<item>
<term> Zero</term>
<description> The <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="false" />, or the <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="true" />, and the value of the <see cref="P:System.Nullable`1.Value" /> property for <paramref name="n1" /> is equal to the value of the <see cref="P:System.Nullable`1.Value" /> property for <paramref name="n2" />.</description>
</item>
<item>
<term> Greater than zero</term>
<description> The <see cref="P:System.Nullable`1.HasValue" /> property for <paramref name="n1" /> is <see langword="true" />, and the <see cref="P:System.Nullable`1.HasValue" /> property for <paramref name="n2" /> is <see langword="false" />, or the <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="true" />, and the value of the <see cref="P:System.Nullable`1.Value" /> property for <paramref name="n1" /> is greater than the value of the <see cref="P:System.Nullable`1.Value" /> property for <paramref name="n2" />.</description>
</item>
</list>
n1
A <see cref="T:System.Nullable`1" /> object.
n2
A <see cref="T:System.Nullable`1" /> object.
public static
bool
Equals(T? n1,
T? n2)
Indicates whether two specified <see cref="T:System.Nullable`1" /> objects are equal.
Returns <see langword="true" /> if the <paramref name="n1" /> parameter is equal to the <paramref name="n2" /> parameter; otherwise, <see langword="false" /> .
The return value depends on the <see cref="P:System.Nullable`1.HasValue" /> and <see cref="P:System.Nullable`1.Value" /> properties of the two parameters that are compared.
<list type="table">
<listheader>
<term> Return Value</term>
<description> Description</description>
</listheader>
<item>
<term>
<see langword="true" />
</term>
<description> The <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="false" />, or the <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="true" />, and the <see cref="P:System.Nullable`1.Value" /> properties of the parameters are equal.</description>
</item>
<item>
<term>
<see langword="false" />
</term>
<description> The <see cref="P:System.Nullable`1.HasValue" /> property is <see langword="true" /> for one parameter and <see langword="false" /> for the other parameter, or the <see cref="P:System.Nullable`1.HasValue" /> properties for <paramref name="n1" /> and <paramref name="n2" /> are <see langword="true" />, and the <see cref="P:System.Nullable`1.Value" /> properties of the parameters are unequal.</description>
</item>
</list>
n1
A <see cref="T:System.Nullable`1" /> object.
n2
A <see cref="T:System.Nullable`1" /> object.
public static
Type
GetUnderlyingType(Type nullableType)
Returns the underlying type argument of the specified nullable type.
Returns The type argument of the <paramref name="nullableType" /> parameter, if the <paramref name="nullableType" /> parameter is a closed generic nullable type; otherwise, <see langword="null" /> .
nullableType
A <see cref="T:System.Type" /> object that describes a closed generic nullable type.
public
bool
Equals(object obj)
Inherited from object
Determines whether the specified object is equal to the current object.
Returns <see langword="true" /> if the specified object is equal to the current object; otherwise, <see langword="false" /> .
obj
The object to compare with the current object.
protected
void
Finalize()
Inherited from object
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
public
int
GetHashCode()
Inherited from object
Serves as the default hash function.
Returns A hash code for the current object.
public
Type
GetType()
Inherited from object
Gets the <see cref="T:System.Type" /> of the current instance.
Returns The exact runtime type of the current instance.
protected
object
MemberwiseClone()
Inherited from object
Creates a shallow copy of the current <see cref="T:System.Object" /> .
Returns A shallow copy of the current <see cref="T:System.Object" /> .
public
string
ToString()
Inherited from object
Returns a string that represents the current object.
Returns A string that represents the current object.