Table of Contents

Class Patterns

Namespace
Cuemon
Assembly
Cuemon.Core.dll

Provides a generic way to support different types of design patterns and practices with small utility methods.

public sealed class Patterns
Inheritance
Patterns

Properties

Use

Gets the singleton instance of the Patterns functionality allowing for extensions methods like: Patterns.Use.SomeIngeniousMethod().

public static Patterns Use { get; }

Property Value

Patterns

The singleton instance of the Patterns functionality.

Methods

ConfigureExchange<TSource, TResult>(Action<TSource>, Action<TSource, TResult>)

Returns the delegate that will configure the public read-write properties of TResult.

public static Action<TResult> ConfigureExchange<TSource, TResult>(Action<TSource> setup, Action<TSource, TResult> initializer = null) where TSource : class, IParameterObject, new() where TResult : class, new()

Parameters

setup Action<TSource>

The delegate that will configure the public read-write properties of TSource.

initializer Action<TSource, TResult>

The delegate that will exchange the parameter of setup from TSource to TResult.

Returns

Action<TResult>

An Action<T> otherwise equivalent to setup.

Type Parameters

TSource

The type of the configuration options class having a default constructor.

TResult

The type of the configuration options class having a default constructor.

ConfigureRevertExchange<TSource, TResult>(TSource, Action<TSource, TResult>)

Returns a delegate that will be initialized by initializer with the values from options.

public static Action<TResult> ConfigureRevertExchange<TSource, TResult>(TSource options, Action<TSource, TResult> initializer = null) where TSource : class, IParameterObject, new() where TResult : class, new()

Parameters

options TSource

The configured options to apply an instance of TResult.

initializer Action<TSource, TResult>

The delegate that will initialize a default instance of TResult with the values from options.

Returns

Action<TResult>

An Action<T> with the values from options.

Type Parameters

TSource

The type of the configuration options having a default constructor.

TResult

The type of the configuration options having a default constructor.

Exceptions

ArgumentNullException

options cannot be null -or- initializer cannot be null.

ConfigureRevert<TOptions>(TOptions)

Returns the delegate that will configure the public read-write properties of TOptions.

public static Action<TOptions> ConfigureRevert<TOptions>(TOptions options) where TOptions : class, new()

Parameters

options TOptions

An instance of the configured options.

Returns

Action<TOptions>

An Action<T> otherwise equivalent to options.

Type Parameters

TOptions

The type of the configuration options having a default constructor.

Exceptions

ArgumentNullException

options cannot be null.

Configure<TOptions>(Action<TOptions>, Action<TOptions>, Action<TOptions>)

Returns the default parameter-less constructed instance of TOptions configured with setup delegate.

public static TOptions Configure<TOptions>(Action<TOptions> setup, Action<TOptions> initializer = null, Action<TOptions> validator = null) where TOptions : class, IParameterObject, new()

Parameters

setup Action<TOptions>

The delegate that will configure the public read-write properties of TOptions.

initializer Action<TOptions>

The optional delegate that will initialize the default parameter-less constructed instance of TOptions. Should only be used with third party libraries or for validation purposes.

validator Action<TOptions>

The optional delegate that will validate the TOptions configured by the setup delegate.

Returns

TOptions

A default constructed instance of TOptions initialized with the options of setup.

Type Parameters

TOptions

The type of the configuration options class having a default constructor.

Remarks

Often referred to as part the Options pattern: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options

CreateInstance<T>(Action<T>)

Provides a generic way to initialize the default, parameterless constructed instance of T.

public static T CreateInstance<T>(Action<T> factory) where T : class, new()

Parameters

factory Action<T>

The delegate that will initialize the public write properties of T.

Returns

T

A default constructed instance of T initialized with factory.

Type Parameters

T

The type of the class having a default constructor.

InvokeOrDefault<TResult>(Func<TResult>, TResult)

Returns an object of TResult, or a default value if the specified method throws an exception.

public static TResult InvokeOrDefault<TResult>(Func<TResult> method, TResult fallbackResult = default)

Parameters

method Func<TResult>

The function delegate that will return an instance of TResult.

fallbackResult TResult

The value to return when the specified method throws an exception. Default is default of TResult.

Returns

TResult

An object of TResult when the specified method can be invoked without an exception; otherwise fallbackResult is returned.

Type Parameters

TResult

The type of the return value of the method.

SafeInvoke<TResult>(Func<TResult>, Func<TResult, TResult>, Action<Exception>)

Provides a generic way to abide the rule description of CA2000 (Dispose objects before losing scope).

public static TResult SafeInvoke<TResult>(Func<TResult> initializer, Func<TResult, TResult> tester, Action<Exception> catcher = null) where TResult : class, IDisposable

Parameters

initializer Func<TResult>

The function delegate that initializes an object implementing the IDisposable interface.

tester Func<TResult, TResult>

The function delegate that is used to ensure that operations performed on TResult abides CA2000.

catcher Action<Exception>

The delegate that will handle any exceptions that might have been thrown by tester.

Returns

TResult

The return value of the function delegate initializer if the operations succeeded; otherwise null if the operation failed.

Type Parameters

TResult

The type of the return value of the function delegate initializer.

SafeInvoke<T, TResult>(Func<TResult>, Func<TResult, T, TResult>, T, Action<Exception, T>)

Provides a generic way to abide the rule description of CA2000 (Dispose objects before losing scope).

public static TResult SafeInvoke<T, TResult>(Func<TResult> initializer, Func<TResult, T, TResult> tester, T arg, Action<Exception, T> catcher = null) where TResult : class, IDisposable

Parameters

initializer Func<TResult>

The function delegate that initializes an object implementing the IDisposable interface.

tester Func<TResult, T, TResult>

The function delegate that is used to ensure that operations performed on TResult abides CA2000.

arg T

The parameter of the function delegate tester and delegate catcher.

catcher Action<Exception, T>

The delegate that will handle any exceptions that might have been thrown by tester.

Returns

TResult

The return value of the function delegate initializer if the operations succeeded; otherwise null if the operation failed.

Type Parameters

T

The type of the parameter of the function delegate tester and delegate catcher.

TResult

The type of the return value of the function delegate initializer.

SafeInvoke<T1, T2, TResult>(Func<TResult>, Func<TResult, T1, T2, TResult>, T1, T2, Action<Exception, T1, T2>)

Provides a generic way to abide the rule description of CA2000 (Dispose objects before losing scope).

public static TResult SafeInvoke<T1, T2, TResult>(Func<TResult> initializer, Func<TResult, T1, T2, TResult> tester, T1 arg1, T2 arg2, Action<Exception, T1, T2> catcher = null) where TResult : class, IDisposable

Parameters

initializer Func<TResult>

The function delegate that initializes an object implementing the IDisposable interface.

tester Func<TResult, T1, T2, TResult>

The function delegate that is used to ensure that operations performed on TResult abides CA2000.

arg1 T1

The first parameter of the function delegate tester and delegate catcher.

arg2 T2

The second parameter of the function delegate tester and delegate catcher.

catcher Action<Exception, T1, T2>

The delegate that will handle any exceptions that might have been thrown by tester.

Returns

TResult

The return value of the function delegate initializer if the operations succeeded; otherwise null if the operation failed.

Type Parameters

T1

The type of the first parameter of the function delegate tester and delegate catcher.

T2

The type of the second parameter of the function delegate tester and delegate catcher.

TResult

The type of the return value of the function delegate initializer.

SafeInvoke<T1, T2, T3, TResult>(Func<TResult>, Func<TResult, T1, T2, T3, TResult>, T1, T2, T3, Action<Exception, T1, T2, T3>)

Provides a generic way to abide the rule description of CA2000 (Dispose objects before losing scope).

public static TResult SafeInvoke<T1, T2, T3, TResult>(Func<TResult> initializer, Func<TResult, T1, T2, T3, TResult> tester, T1 arg1, T2 arg2, T3 arg3, Action<Exception, T1, T2, T3> catcher = null) where TResult : class, IDisposable

Parameters

initializer Func<TResult>

The function delegate that initializes an object implementing the IDisposable interface.

tester Func<TResult, T1, T2, T3, TResult>

The function delegate that is used to ensure that operations performed on TResult abides CA2000.

arg1 T1

The first parameter of the function delegate tester and delegate catcher.

arg2 T2

The second parameter of the function delegate tester and delegate catcher.

arg3 T3

The third parameter of the function delegate tester and delegate catcher.

catcher Action<Exception, T1, T2, T3>

The delegate that will handle any exceptions that might have been thrown by tester.

Returns

TResult

The return value of the function delegate initializer if the operations succeeded; otherwise null if the operation failed.

Type Parameters

T1

The type of the first parameter of the function delegate tester and delegate catcher.

T2

The type of the second parameter of the function delegate tester and delegate catcher.

T3

The type of the third parameter of the function delegate tester and delegate catcher.

TResult

The type of the return value of the function delegate initializer.

SafeInvoke<T1, T2, T3, T4, TResult>(Func<TResult>, Func<TResult, T1, T2, T3, T4, TResult>, T1, T2, T3, T4, Action<Exception, T1, T2, T3, T4>)

Provides a generic way to abide the rule description of CA2000 (Dispose objects before losing scope).

public static TResult SafeInvoke<T1, T2, T3, T4, TResult>(Func<TResult> initializer, Func<TResult, T1, T2, T3, T4, TResult> tester, T1 arg1, T2 arg2, T3 arg3, T4 arg4, Action<Exception, T1, T2, T3, T4> catcher = null) where TResult : class, IDisposable

Parameters

initializer Func<TResult>

The function delegate that initializes an object implementing the IDisposable interface.

tester Func<TResult, T1, T2, T3, T4, TResult>

The function delegate that is used to ensure that operations performed on TResult abides CA2000.

arg1 T1

The first parameter of the function delegate tester and delegate catcher.

arg2 T2

The second parameter of the function delegate tester and delegate catcher.

arg3 T3

The third parameter of the function delegate tester and delegate catcher.

arg4 T4

The fourth parameter of the function delegate tester and delegate catcher.

catcher Action<Exception, T1, T2, T3, T4>

The delegate that will handle any exceptions that might have been thrown by tester.

Returns

TResult

The return value of the function delegate initializer if the operations succeeded; otherwise null if the operation failed.

Type Parameters

T1

The type of the first parameter of the function delegate tester and delegate catcher.

T2

The type of the second parameter of the function delegate tester and delegate catcher.

T3

The type of the third parameter of the function delegate tester and delegate catcher.

T4

The type of the fourth parameter of the function delegate tester and delegate catcher.

TResult

The type of the return value of the function delegate initializer.

SafeInvoke<T1, T2, T3, T4, T5, TResult>(Func<TResult>, Func<TResult, T1, T2, T3, T4, T5, TResult>, T1, T2, T3, T4, T5, Action<Exception, T1, T2, T3, T4, T5>)

Provides a generic way to abide the rule description of CA2000 (Dispose objects before losing scope).

public static TResult SafeInvoke<T1, T2, T3, T4, T5, TResult>(Func<TResult> initializer, Func<TResult, T1, T2, T3, T4, T5, TResult> tester, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, Action<Exception, T1, T2, T3, T4, T5> catcher = null) where TResult : class, IDisposable

Parameters

initializer Func<TResult>

The function delegate that initializes an object implementing the IDisposable interface.

tester Func<TResult, T1, T2, T3, T4, T5, TResult>

The function delegate that is used to ensure that operations performed on TResult abides CA2000.

arg1 T1

The first parameter of the function delegate tester and delegate catcher.

arg2 T2

The second parameter of the function delegate tester and delegate catcher.

arg3 T3

The third parameter of the function delegate tester and delegate catcher.

arg4 T4

The fourth parameter of the function delegate tester and delegate catcher.

arg5 T5

The fifth parameter of the function delegate tester and delegate catcher.

catcher Action<Exception, T1, T2, T3, T4, T5>

The delegate that will handle any exceptions that might have been thrown by tester.

Returns

TResult

The return value of the function delegate initializer if the operations succeeded; otherwise null if the operation failed.

Type Parameters

T1

The type of the first parameter of the function delegate tester and delegate catcher.

T2

The type of the second parameter of the function delegate tester and delegate catcher.

T3

The type of the third parameter of the function delegate tester and delegate catcher.

T4

The type of the fourth parameter of the function delegate tester and delegate catcher.

T5

The type of the fifth parameter of the function delegate tester and delegate catcher.

TResult

The type of the return value of the function delegate initializer.

TryInvoke(Action)

Returns a value that indicates whether the specified method can be invoked without an exception.

public static bool TryInvoke(Action method)

Parameters

method Action

The delegate that to invoke.

Returns

bool

true if method was called without raising an exception; otherwise false.

Remarks

Actually an anti-pattern in regards to swallowing exception. That said, there are situations where this is a perfectly valid approach.

TryInvoke<TResult>(Func<TResult>, out TResult)

Returns a value that indicates whether the specified method can be invoked without an exception.

public static bool TryInvoke<TResult>(Func<TResult> method, out TResult result)

Parameters

method Func<TResult>

The function delegate that will resolve result.

result TResult

When this method returns, contains the value returned from method; otherwise the default value for the type of the result parameter if an exception is thrown.

Returns

bool

true if an instance of TResult has been created; otherwise false.

Type Parameters

TResult

The type of the return value of the method.

Remarks

Often referred to as the Try-Parse pattern: https://docs.microsoft.com/en-us/dotnet/standard/design-guidelines/exceptions-and-performance

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