Class WhenExtensions

Namespace

FunctionalDdd

Assembly

FunctionalDdd.RailwayOrientedProgramming.dll

Conditionally executes an operation based on a predicate, maintaining the railway. Useful for executing operations only when certain conditions are met without breaking the Result chain.

public static class WhenExtensions

Inheritance

object

WhenExtensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Examples

// Apply discount only for premium users
var result = order
    .When(o => o.IsPremiumUser, o => ApplyDiscount(o))
    .Bind(o => ProcessPayment(o));

// Validate only if amount exceeds threshold with cancellation support
var ct = cancellationToken;
await GetTransactionAsync(id)
    .WhenAsync(
        t => t.Amount > 10000,
        t => PerformAdditionalValidationAsync(t, ct)
    );

Remarks

Users should capture CancellationToken in their lambda closures when cancellation support is needed.

Methods

Unless<T>(Result<T>, bool, Func<T, Result<T>>)

Conditionally executes an operation if the condition is false.

public static Result<T> Unless<T>(this Result<T> result, bool condition, Func<T, Result<T>> operation)

Parameters

result Result<T>

The result to test.

condition bool

Boolean condition.

operation Func<T, Result<T>>

Operation to execute if condition is false.

Returns

Result<T>

Result from the operation if condition is false and result is success; otherwise the original result.

Type Parameters

T

Type of the result value.

Unless<T>(Result<T>, Func<T, bool>, Func<T, Result<T>>)

Conditionally executes an operation if the predicate returns false.

public static Result<T> Unless<T>(this Result<T> result, Func<T, bool> predicate, Func<T, Result<T>> operation)

Parameters

result Result<T>

The result to test.

predicate Func<T, bool>

Predicate function to test the value.

operation Func<T, Result<T>>

Operation to execute if predicate is false.

Returns

Result<T>

Result from the operation if predicate is false and result is success; otherwise the original result.

Type Parameters

T

Type of the result value.

When<T>(Result<T>, bool, Func<T, Result<T>>)

Conditionally executes an operation if the condition is true.

public static Result<T> When<T>(this Result<T> result, bool condition, Func<T, Result<T>> operation)

Parameters

result Result<T>

The result to test.

condition bool

Boolean condition.

operation Func<T, Result<T>>

Operation to execute if condition is true.

Returns

Result<T>

Result from the operation if condition is true and result is success; otherwise the original result.

Type Parameters

T

Type of the result value.

When<T>(Result<T>, Func<T, bool>, Func<T, Result<T>>)

Conditionally executes an operation if the predicate returns true.

public static Result<T> When<T>(this Result<T> result, Func<T, bool> predicate, Func<T, Result<T>> operation)

Parameters

result Result<T>

The result to test.

predicate Func<T, bool>

Predicate function to test the value.

operation Func<T, Result<T>>

Operation to execute if predicate is true.

Returns

Result<T>

Result from the operation if predicate is true and result is success; otherwise the original result.

Type Parameters

T

Type of the result value.