TryCastExtensionTryCastTValue Method

Creates the TryCastWorkerTValue object to get a fluent notation for try-casting types.

This pattern avoids heavily nested if (class is type) / else chains when testing for more than one possible cast.

Namespace: TomsToolbox.Desktop
Assembly: TomsToolbox.Desktop (in TomsToolbox.Desktop.dll)

Syntax

public static TryCastWorker<TValue> TryCast<TValue>(
	this TValue value
)
where TValue : class

<ExtensionAttribute>
Public Shared Function TryCast(Of TValue As Class) ( 
	value As TValue
) As TryCastWorker(Of TValue)

Parameters

value: Type: TValue
The value.

Type Parameters

TValue: The type of the value.

Return Value

Type: TryCastWorkerTValue
The TryCastWorkerTValue object.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type . When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Remarks

This has been somewhat superseded by the new C# language feature switch() { case Type variable: ... }, but for some complex scenarios it might still have some advantages.

Examples

Copy

schedule.TryCast()
    .When<SingleSchedule>(x => x.Remove())
    .When<RecurrentSchedule>(x = > x.AddExceptionDate(date))
    .ElseThrow();

Reference

TryCastExtension Class