Interface IFactoryComposer<T>

Provides statements that can be used to control how specimens are created.

Inherited Members
Namespace: AutoFixture.Dsl
Assembly: AutoFixture.dll
Syntax
public interface IFactoryComposer<T> : ISpecimenBuilder
Type Parameters
Name Description
T

The type of specimen.

Methods

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FromFactory(ISpecimenBuilder)

Specifies an ISpecimenBuilder that can create specimens of the appropriate type. Mostly for advanced scenarios.

Declaration
IPostprocessComposer<T> FromFactory(ISpecimenBuilder factory)
Parameters
Type Name Description
ISpecimenBuilder factory

An ISpecimenBuilder that can create specimens of the appropriate type.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.
Remarks

This method is mostly intended for advanced scenarios where a more loosely coupled strategy is desired to create specimens, but the advantages of the strongly typed IPostprocessComposer<T> are still desired for post-processing.

One possible scenario is for post-processing of interfaces or abstract types where auto-mocking is desired to create the instance. This method makes it possible to supply an auto-mocking ISpecimenBuilder.

factory must be able to create specimens of the requested type, or exceptions may be thrown.

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FromFactory(Func<T>)

Specifies that an anonymous object should be created in a particular way; often by using a constructor.

Declaration
IPostprocessComposer<T> FromFactory(Func<T> factory)
Parameters
Type Name Description
System.Func<T> factory

A function that will be used to create the object. This will often be a constructor.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.
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FromFactory<TInput>(Func<TInput, T>)

Specifies that a specimen should be created in a particular way, using a single input parameter for the factory.

Declaration
IPostprocessComposer<T> FromFactory<TInput>(Func<TInput, T> factory)
Parameters
Type Name Description
System.Func<TInput, T> factory

A function that will be used to create the object. This will often be a constructor that takes a single constructor argument of type TInput.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.
Type Parameters
Name Description
TInput

The type of input parameter to use when invoking factory.
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FromFactory<TInput1, TInput2>(Func<TInput1, TInput2, T>)

Specifies that a specimen should be created in a particular way, using two input parameters for the construction.

Declaration
IPostprocessComposer<T> FromFactory<TInput1, TInput2>(Func<TInput1, TInput2, T> factory)
Parameters
Type Name Description
System.Func<TInput1, TInput2, T> factory

A function that will be used to create the object. This will often be a constructor that takes two constructor arguments of type TInput1 and TInput2.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.
Type Parameters
Name Description
TInput1

The type of the first input parameter to use when invoking factory.
TInput2

The type of the second input parameter to use when invoking factory.
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FromFactory<TInput1, TInput2, TInput3>(Func<TInput1, TInput2, TInput3, T>)

Specifies that a specimen should be created in a particular way, using three input parameters for the construction.

Declaration
IPostprocessComposer<T> FromFactory<TInput1, TInput2, TInput3>(Func<TInput1, TInput2, TInput3, T> factory)
Parameters
Type Name Description
System.Func<TInput1, TInput2, TInput3, T> factory

A function that will be used to create the object. This will often be a constructor that takes three constructor arguments of type TInput1, TInput2 and TInput3.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.
Type Parameters
Name Description
TInput1

The type of the first input parameter to use when invoking factory.
TInput2

The type of the second input parameter to use when invoking factory.
TInput3

The type of the third input parameter to use when invoking factory.
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FromFactory<TInput1, TInput2, TInput3, TInput4>(Func<TInput1, TInput2, TInput3, TInput4, T>)

Specifies that a specimen should be created in a particular way, using four input parameters for the construction.

Declaration
IPostprocessComposer<T> FromFactory<TInput1, TInput2, TInput3, TInput4>(Func<TInput1, TInput2, TInput3, TInput4, T> factory)
Parameters
Type Name Description
System.Func<TInput1, TInput2, TInput3, TInput4, T> factory

A function that will be used to create the object. This will often be a constructor that takes three constructor arguments of type TInput1, TInput2, TInput3 and TInput4.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.
Type Parameters
Name Description
TInput1

The type of the first input parameter to use when invoking factory.
TInput2

The type of the second input parameter to use when invoking factory.
TInput3

The type of the third input parameter to use when invoking factory.
TInput4

The type of the fourth input parameter to use when invoking factory.
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FromSeed(Func<T, T>)

Specifies a function that defines how to create a specimen from a seed.

Declaration
IPostprocessComposer<T> FromSeed(Func<T, T> factory)
Parameters
Type Name Description
System.Func<T, T> factory

The factory used to create specimens from seeds.
Returns
Type Description
IPostprocessComposer<T>

An IPostprocessComposer<T> which can be used to further customize the post-processing of created specimens.

Extension Methods