NullableHelper

Convert``2

public static TResult Convert<T, TResult>(T value, Func<T, TResult> notNullFunc, Func<TResult> nullFunc)

result = NullableHelper.Convert(value, notNullFunc, nullFunc)

Converts the value to a result type using the appropriate conversion function based on whether the value is null.

value

The input value to convert.

notNullFunc

A function to convert the value when it is not null.

nullFunc

A function to produce a result when the value is null.

Rückgabe: The result of applying either or to the value.

DefaultAsNull``1

public static T? DefaultAsNull<T>(T value)

result = NullableHelper.DefaultAsNull(value)

Returns the default value as null if the value is equal to its default; otherwise, returns the value as a nullable type.

value

The value to check.

Rückgabe: Null if the value is the default of its type; otherwise, the value wrapped as a nullable type.

GetUnderlyingType

public static Type GetUnderlyingType(Type nullableType)

result = NullableHelper.GetUnderlyingType(nullableType)

Gets the underlying type argument of the specified nullable type.

nullableType

The nullable type to get the underlying type from.

Rückgabe: The underlying type if the provided type is nullable; otherwise, null.

IsNullable

public static bool IsNullable(Type type)

result = NullableHelper.IsNullable(type)

Determines whether the specified type is a nullable type.

type

The type to inspect.

Rückgabe: True if the type is nullable; otherwise, false.

IsNull``1

public static bool IsNull<T>(T value)

result = NullableHelper.IsNull(value)

Determines whether the specified value is null. For value types, this method returns false.

value

The value to check for null.

Rückgabe: True if the value is null; otherwise, false.

IsNull``1

public static bool IsNull<T>(T value, bool checkValueTypeOnDefault)

result = NullableHelper.IsNull(value, checkValueTypeOnDefault)

Determines whether the specified value is null or its default for value types.

value

The value to check.

checkValueTypeOnDefault

If true and the type is a value type, the value is compared to its default value.

Rückgabe: True if the reference type value is null or if the value type is equal to its default value when is true; otherwise, false.

MakeNullable

public static Type MakeNullable(Type type)

result = NullableHelper.MakeNullable(type)

Creates a nullable type from the given type.

type

The type to make nullable.

Rückgabe: A nullable type of the given type.

TryMakeNullable

public static Type TryMakeNullable(Type type)

result = NullableHelper.TryMakeNullable(type)

Converts the given type to a nullable type if it is a non-nullable value type.

type

The type to convert.

Rückgabe: The nullable version of the type if it is a value type and not already nullable; otherwise, the original type.