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Showing content from https://dotnet.github.io/dotNext/api/DotNext.Predicate.html below:

Class Predicate | .NEXT

Class Predicate

Provides extension methods for type Predicate<T> and predefined predicates.

Namespace: DotNext Assembly: DotNext.dll Syntax 
public static class Predicate
Methods | Edit this page View Source And<T>(Predicate<T>, Predicate<T>)

Returns a predicate which computes logical AND between results of two other predicates.

Declaration 
public static Predicate<T> And<T>(this Predicate<T> left, Predicate<T> right)
Parameters Type Name Description Predicate<T> left

The first predicate acting as logical AND operand.

Predicate<T> right

The second predicate acting as logical AND operand.

Returns Type Description Predicate<T>

The predicate which computes logical AND between results of two other predicates.

Type Parameters Name Description T

Type of the predicate argument.

| Edit this page View Source AsConverter<T>(Predicate<T>)

Represents predicate as type Converter<TInput, TOutput>.

Declaration 
public static Converter<T, bool> AsConverter<T>(this Predicate<T> predicate)
Parameters Type Name Description Predicate<T> predicate

A predicate to convert.

Returns Type Parameters Name Description T

Type of predicate argument.

| Edit this page View Source AsFunc<T>(Predicate<T>)

Represents predicate as type Func<T, TResult>.

Declaration 
public static Func<T, bool> AsFunc<T>(this Predicate<T> predicate)
Parameters Type Name Description Predicate<T> predicate

A predicate to convert.

Returns Type Parameters Name Description T

Type of predicate argument.

| Edit this page View Source Constant<T>(bool)

Returns a predicate which always returns the specified value.

Declaration 
public static Predicate<T> Constant<T>(bool value)
Parameters Type Name Description bool value

The value to be returned by the predicate.

Returns Type Description Predicate<T>

A cached predicate always returning value.

Type Parameters Name Description T

The type of the input parameter.

| Edit this page View Source HasValue<T>()

Returns predicate checking that input argument of value type is not null.

Declaration 
public static Predicate<T?> HasValue<T>() where T : struct
Returns Type Description Predicate<T?>

The predicate instance.

Type Parameters Name Description T

The type of the predicate argument.

| Edit this page View Source IsNotNull<T>()

Returns predicate checking that input argument is not null.

Declaration 
public static Predicate<T> IsNotNull<T>() where T : class?
Returns Type Description Predicate<T>

The predicate instance.

Type Parameters Name Description T

The type of the predicate argument.

| Edit this page View Source IsNull<T>()

Returns predicate implementing nullability check.

Declaration 
public static Predicate<T> IsNull<T>() where T : class?
Returns Type Description Predicate<T>

The predicate instance.

Type Parameters Name Description T

Type of predicate argument.

| Edit this page View Source IsTypeOf<T>()

Gets a predicate that can be used to check whether the specified object is of specific type.

Declaration 
public static Predicate<object?> IsTypeOf<T>()
Returns Type Parameters Name Description T

The target type.

| Edit this page View Source Negate<T>(Predicate<T>)

Returns a predicate which negates evaluation result of the original predicate.

Declaration 
public static Predicate<T> Negate<T>(this Predicate<T> predicate)
Parameters Type Name Description Predicate<T> predicate

The predicate to negate.

Returns Type Description Predicate<T>

The predicate which negates evaluation result of the original predicate.

Type Parameters Name Description T

Type of the predicate argument.

| Edit this page View Source Or<T>(Predicate<T>, Predicate<T>)

Returns a predicate which computes logical OR between results of two other predicates.

Declaration 
public static Predicate<T> Or<T>(this Predicate<T> left, Predicate<T> right)
Parameters Type Name Description Predicate<T> left

The first predicate acting as logical OR operand.

Predicate<T> right

The second predicate acting as logical OR operand.

Returns Type Description Predicate<T>

The predicate which computes logical OR between results of two other predicates.

Type Parameters Name Description T

Type of the predicate argument.

| Edit this page View Source TryInvoke<T>(Predicate<T>, T)

Invokes predicate without throwing the exception.

Declaration 
public static Result<bool> TryInvoke<T>(this Predicate<T> predicate, T obj)
Parameters Type Name Description Predicate<T> predicate

The predicate to invoke.

T obj

The object to compare against the criteria defined within the method represented by this delegate.

Returns Type Description Result<bool>

true if obj meets the criteria defined within the method represented by this delegate; otherwise, false.

Type Parameters Name Description T

The type of the object to compare.

| Edit this page View Source Xor<T>(Predicate<T>, Predicate<T>)

Returns a predicate which computes logical XOR between results of two other predicates.

Declaration 
public static Predicate<T> Xor<T>(this Predicate<T> left, Predicate<T> right)
Parameters Type Name Description Predicate<T> left

The first predicate acting as logical XOR operand.

Predicate<T> right

The second predicate acting as logical XOR operand.

Returns Type Description Predicate<T>

The predicate which computes logical XOR between results of two other predicates.

Type Parameters Name Description T

Type of the predicate argument.

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