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88.1

/SRC/Interfaces/Public/Extensions/IServiceCollectionBasicExtensions/Factory.cs

/********************************************************************************
* Factory.cs                                                                    *
*                                                                               *
* Author: Denes Solti                                                           *
********************************************************************************/
using System;
using System.Linq.Expressions;

namespace Solti.Utils.DI.Interfaces
{
    public static partial class IServiceCollectionBasicExtensions
    {
        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory(typeof(IMyService), "serviceName", (scope, type) => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="type">The service type to be registered. It can not be null and can be registered only once (with the given <paramref name="key"/>).</param>
        /// <param name="key">The (optional) service key (usually a name).</param>
        /// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factoryExpr"/> is never generic, even if you registered the factory for an open generic interface.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        /// <remarks>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</remarks>
        public static IServiceCollection Factory(this IServiceCollection self, Type type, object? key, Expression<FactoryDelegate> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null)
        {
            if (self is null)
                throw new ArgumentNullException(nameof(self));

            if (type is null)
                throw new ArgumentNullException(nameof(type));

            if (factoryExpr is null)
                throw new ArgumentNullException(nameof(factoryExpr));

            if (lifetime is null)
                throw new ArgumentNullException(nameof(lifetime));

            return self.Register
            (
                //
                // Further validations are done by the created xXxServiceEntry
                //

                lifetime.CreateFrom(type, key, factoryExpr, options ?? ServiceOptions.Default)
            );
        }

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory(typeof(IMyService), "serviceName", (scope, type) => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="type">The service type to be registered. It can not be null and can be registered only once (with the given <paramref name="key"/>).</param>
        /// <param name="key">The (optional) service key (usually a name).</param>
        /// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factory"/> is never generic, even if you registered the factory for an open generic interface.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        /// <remarks>
        /// <list type="bullet">
        /// <item>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</item>
        /// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory(IServiceCollection, Type, object?, Expression{FactoryDelegate}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
        /// </list>
        /// </remarks>
        public static IServiceCollection Factory(this IServiceCollection self, Type type, object? key, FactoryDelegate factory, LifetimeBase lifetime, ServiceOptions? options = null)
            => factory is not null
                ? self.Factory(type, key, factoryExpr: (scope, type) => factory(scope, type), lifetime, options)
                : throw new ArgumentNullException(nameof(factory));

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory(typeof(IMyService), (scope, type) => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="type">The service type to be registered. It can not be null and can be registered only once.</param>
        /// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factoryExpr"/> is never generic, even if you registered the factory for an open generic interface.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        /// <remarks>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</remarks>
        public static IServiceCollection Factory(this IServiceCollection self, Type type, Expression<FactoryDelegate> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null) 
            => self.Factory(type, null, factoryExpr, lifetime, options);

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory(typeof(IMyService), (scope, type) => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="type">The service type to be registered. It can not be null and can be registered only once.</param>
        /// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factory"/> is never generic, even if you registered the factory for an open generic interface.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        /// <remarks>
        /// <list type="bullet">
        /// <item>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</item>
        /// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory(IServiceCollection, Type, Expression{FactoryDelegate}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
        /// </list>
        /// </remarks>
        public static IServiceCollection Factory(this IServiceCollection self, Type type, FactoryDelegate factory, LifetimeBase lifetime, ServiceOptions? options = null)
            => self.Factory(type, null, factory, lifetime, options);

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory&lt;IMyService&gt;("serviceName", scope => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <typeparam name="TType">The service type to be registered. It can be registered only once (with the given <paramref name="key"/>).</typeparam>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="key">The (optional) service key (usually a name).</param>
        /// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        public static IServiceCollection Factory<TType>(this IServiceCollection self, object? key, Expression<FactoryDelegate<TType>> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
            => self.Factory(typeof(TType), key, WrapToStandardDelegate(factoryExpr), lifetime, options);

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory&lt;IMyService&gt;("serviceName", scope => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <typeparam name="TType">The service type to be registered. It can be registered only once (with the given <paramref name="key"/>).</typeparam>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="key">The (optional) service key (usually a name).</param>
        /// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        /// <remarks>
        /// <list type="bullet">
        /// <item>You can register generic services (where the <typeparamref name="TType"/> is an open generic type).</item>
        /// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory{TType}(IServiceCollection, object?, Expression{FactoryDelegate{TType}}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
        /// </list>
        /// </remarks>
        public static IServiceCollection Factory<TType>(this IServiceCollection self, object? key, FactoryDelegate<TType> factory, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
            => factory is not null
                ? self.Factory(key, factoryExpr: scope => factory(scope), lifetime, options)
                : throw new ArgumentNullException(nameof(factory));

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory&lt;IMyService&gt;(scope => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <typeparam name="TType">The service type to be registered. It can be registered only once.</typeparam>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        public static IServiceCollection Factory<TType>(this IServiceCollection self, Expression<FactoryDelegate<TType>> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
            => self.Factory(typeof(TType), null, WrapToStandardDelegate(factoryExpr), lifetime, options);

        /// <summary>
        /// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
        /// <code>
        /// ScopeFactory.Create
        /// (
        ///     svcs => svcs.Factory&lt;IMyService&gt;(scope => new MyService(...), Lifetime.Singleton),
        ///     ...
        /// )
        /// </code>
        /// </summary>
        /// <typeparam name="TType">The service type to be registered. It can be registered only once.</typeparam>
        /// <param name="self">The target <see cref="IServiceCollection"/>.</param>
        /// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
        /// <param name="lifetime">The lifetime of service.</param>
        /// <param name="options">Options to be assigned to the service being registered.</param>
        /// <remarks>
        /// <list type="bullet">
        /// <item>You can register generic services (where the <typeparamref name="TType"/> is an open generic type).</item>
        /// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory{TType}(IServiceCollection, Expression{FactoryDelegate{TType}}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
        /// </list>
        /// </remarks>
        public static IServiceCollection Factory<TType>(this IServiceCollection self, FactoryDelegate<TType> factory, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
            => self.Factory(null, factory, lifetime, options);

        private static Expression<FactoryDelegate> WrapToStandardDelegate<TInterface>(Expression<FactoryDelegate<TInterface>> factoryExpr) where TInterface : class
        {
            if (factoryExpr is null)
                throw new ArgumentNullException(nameof(factoryExpr));

            ParameterExpression
                injector = factoryExpr.Parameters[0],
                type = Expression.Parameter(typeof(Type), nameof(type));

            return Expression.Lambda<FactoryDelegate>
            (
                factoryExpr.Body,
                injector,
                type
            );
        }
    }
}

1	/********************************************************************************
2	* Factory.cs *
3	* *
4	* Author: Denes Solti *
5	********************************************************************************/
6	using System;
7	using System.Linq.Expressions;
8
9	namespace Solti.Utils.DI.Interfaces
10	{
11	public static partial class IServiceCollectionBasicExtensions
12	{
13	/// <summary>
14	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
15	/// <code>
16	/// ScopeFactory.Create
17	/// (
18	/// svcs => svcs.Factory(typeof(IMyService), "serviceName", (scope, type) => new MyService(...), Lifetime.Singleton),
19	/// ...
20	/// )
21	/// </code>
22	/// </summary>
23	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
24	/// <param name="type">The service type to be registered. It can not be null and can be registered only once (with the given <paramref name="key"/>).</param>
25	/// <param name="key">The (optional) service key (usually a name).</param>
26	/// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factoryExpr"/> is never generic, even if you registered the factory for an open generic interface.</param>
27	/// <param name="lifetime">The lifetime of service.</param>
28	/// <param name="options">Options to be assigned to the service being registered.</param>
29	/// <remarks>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</remarks>
30	public static IServiceCollection Factory(this IServiceCollection self, Type type, object? key, Expression<FactoryDelegate> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null)
31	{	1✔
32	if (self is null)	1✔
33	throw new ArgumentNullException(nameof(self));	1✔
34
35	if (type is null)	1✔
36	throw new ArgumentNullException(nameof(type));	1✔
37
38	if (factoryExpr is null)	1✔
39	throw new ArgumentNullException(nameof(factoryExpr));	1✔
40
41	if (lifetime is null)	1✔
42	throw new ArgumentNullException(nameof(lifetime));	1✔
43
44	return self.Register	1✔
45	(	1✔
46	//	1✔
47	// Further validations are done by the created xXxServiceEntry	1✔
48	//	1✔
49		1✔
50	lifetime.CreateFrom(type, key, factoryExpr, options ?? ServiceOptions.Default)	1✔
51	);	1✔
52	}	1✔
53
54	/// <summary>
55	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
56	/// <code>
57	/// ScopeFactory.Create
58	/// (
59	/// svcs => svcs.Factory(typeof(IMyService), "serviceName", (scope, type) => new MyService(...), Lifetime.Singleton),
60	/// ...
61	/// )
62	/// </code>
63	/// </summary>
64	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
65	/// <param name="type">The service type to be registered. It can not be null and can be registered only once (with the given <paramref name="key"/>).</param>
66	/// <param name="key">The (optional) service key (usually a name).</param>
67	/// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factory"/> is never generic, even if you registered the factory for an open generic interface.</param>
68	/// <param name="lifetime">The lifetime of service.</param>
69	/// <param name="options">Options to be assigned to the service being registered.</param>
70	/// <remarks>
71	/// <list type="bullet">
72	/// <item>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</item>
73	/// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory(IServiceCollection, Type, object?, Expression{FactoryDelegate}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
74	/// </list>
75	/// </remarks>
76	public static IServiceCollection Factory(this IServiceCollection self, Type type, object? key, FactoryDelegate factory, LifetimeBase lifetime, ServiceOptions? options = null)
77	=> factory is not null	1✔
78	? self.Factory(type, key, factoryExpr: (scope, type) => factory(scope, type), lifetime, options)	1✔
79	: throw new ArgumentNullException(nameof(factory));	1✔
80
81	/// <summary>
82	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
83	/// <code>
84	/// ScopeFactory.Create
85	/// (
86	/// svcs => svcs.Factory(typeof(IMyService), (scope, type) => new MyService(...), Lifetime.Singleton),
87	/// ...
88	/// )
89	/// </code>
90	/// </summary>
91	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
92	/// <param name="type">The service type to be registered. It can not be null and can be registered only once.</param>
93	/// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factoryExpr"/> is never generic, even if you registered the factory for an open generic interface.</param>
94	/// <param name="lifetime">The lifetime of service.</param>
95	/// <param name="options">Options to be assigned to the service being registered.</param>
96	/// <remarks>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</remarks>
97	public static IServiceCollection Factory(this IServiceCollection self, Type type, Expression<FactoryDelegate> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null)
98	=> self.Factory(type, null, factoryExpr, lifetime, options);	1✔
99
100	/// <summary>
101	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
102	/// <code>
103	/// ScopeFactory.Create
104	/// (
105	/// svcs => svcs.Factory(typeof(IMyService), (scope, type) => new MyService(...), Lifetime.Singleton),
106	/// ...
107	/// )
108	/// </code>
109	/// </summary>
110	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
111	/// <param name="type">The service type to be registered. It can not be null and can be registered only once.</param>
112	/// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter. Note that the second parameter of the <paramref name="factory"/> is never generic, even if you registered the factory for an open generic interface.</param>
113	/// <param name="lifetime">The lifetime of service.</param>
114	/// <param name="options">Options to be assigned to the service being registered.</param>
115	/// <remarks>
116	/// <list type="bullet">
117	/// <item>You can register generic services (where the <paramref name="type"/> parameter is an open generic type).</item>
118	/// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory(IServiceCollection, Type, Expression{FactoryDelegate}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
119	/// </list>
120	/// </remarks>
121	public static IServiceCollection Factory(this IServiceCollection self, Type type, FactoryDelegate factory, LifetimeBase lifetime, ServiceOptions? options = null)
122	=> self.Factory(type, null, factory, lifetime, options);	1✔
123
124	/// <summary>
125	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
126	/// <code>
127	/// ScopeFactory.Create
128	/// (
129	/// svcs => svcs.Factory<IMyService>("serviceName", scope => new MyService(...), Lifetime.Singleton),
130	/// ...
131	/// )
132	/// </code>
133	/// </summary>
134	/// <typeparam name="TType">The service type to be registered. It can be registered only once (with the given <paramref name="key"/>).</typeparam>
135	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
136	/// <param name="key">The (optional) service key (usually a name).</param>
137	/// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
138	/// <param name="lifetime">The lifetime of service.</param>
139	/// <param name="options">Options to be assigned to the service being registered.</param>
140	public static IServiceCollection Factory<TType>(this IServiceCollection self, object? key, Expression<FactoryDelegate<TType>> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
141	=> self.Factory(typeof(TType), key, WrapToStandardDelegate(factoryExpr), lifetime, options);	1✔
142
143	/// <summary>
144	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
145	/// <code>
146	/// ScopeFactory.Create
147	/// (
148	/// svcs => svcs.Factory<IMyService>("serviceName", scope => new MyService(...), Lifetime.Singleton),
149	/// ...
150	/// )
151	/// </code>
152	/// </summary>
153	/// <typeparam name="TType">The service type to be registered. It can be registered only once (with the given <paramref name="key"/>).</typeparam>
154	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
155	/// <param name="key">The (optional) service key (usually a name).</param>
156	/// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
157	/// <param name="lifetime">The lifetime of service.</param>
158	/// <param name="options">Options to be assigned to the service being registered.</param>
159	/// <remarks>
160	/// <list type="bullet">
161	/// <item>You can register generic services (where the <typeparamref name="TType"/> is an open generic type).</item>
162	/// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory{TType}(IServiceCollection, object?, Expression{FactoryDelegate{TType}}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
163	/// </list>
164	/// </remarks>
165	public static IServiceCollection Factory<TType>(this IServiceCollection self, object? key, FactoryDelegate<TType> factory, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
166	=> factory is not null	×
167	? self.Factory(key, factoryExpr: scope => factory(scope), lifetime, options)	×
168	: throw new ArgumentNullException(nameof(factory));	×
169
170	/// <summary>
171	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
172	/// <code>
173	/// ScopeFactory.Create
174	/// (
175	/// svcs => svcs.Factory<IMyService>(scope => new MyService(...), Lifetime.Singleton),
176	/// ...
177	/// )
178	/// </code>
179	/// </summary>
180	/// <typeparam name="TType">The service type to be registered. It can be registered only once.</typeparam>
181	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
182	/// <param name="factoryExpr">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
183	/// <param name="lifetime">The lifetime of service.</param>
184	/// <param name="options">Options to be assigned to the service being registered.</param>
185	public static IServiceCollection Factory<TType>(this IServiceCollection self, Expression<FactoryDelegate<TType>> factoryExpr, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
186	=> self.Factory(typeof(TType), null, WrapToStandardDelegate(factoryExpr), lifetime, options);	1✔
187
188	/// <summary>
189	/// Registers a new service factory with the given type. Factories are also services except that the instantiating process is delegated to the caller. Useful if a service has more than one constructor:
190	/// <code>
191	/// ScopeFactory.Create
192	/// (
193	/// svcs => svcs.Factory<IMyService>(scope => new MyService(...), Lifetime.Singleton),
194	/// ...
195	/// )
196	/// </code>
197	/// </summary>
198	/// <typeparam name="TType">The service type to be registered. It can be registered only once.</typeparam>
199	/// <param name="self">The target <see cref="IServiceCollection"/>.</param>
200	/// <param name="factory">The factory function that is responsible for the instantiation. Its call count depends on the value of the <paramref name="lifetime"/> parameter.</param>
201	/// <param name="lifetime">The lifetime of service.</param>
202	/// <param name="options">Options to be assigned to the service being registered.</param>
203	/// <remarks>
204	/// <list type="bullet">
205	/// <item>You can register generic services (where the <typeparamref name="TType"/> is an open generic type).</item>
206	/// <item>It's advised to utilize <paramref name="factory"/> expressions (using the <see cref="Factory{TType}(IServiceCollection, Expression{FactoryDelegate{TType}}, LifetimeBase, ServiceOptions?)"/> method) insted of real factories as they are more performant.</item>
207	/// </list>
208	/// </remarks>
209	public static IServiceCollection Factory<TType>(this IServiceCollection self, FactoryDelegate<TType> factory, LifetimeBase lifetime, ServiceOptions? options = null) where TType : class
210	=> self.Factory(null, factory, lifetime, options);	×
211
212	private static Expression<FactoryDelegate> WrapToStandardDelegate<TInterface>(Expression<FactoryDelegate<TInterface>> factoryExpr) where TInterface : class
213	{	1✔
214	if (factoryExpr is null)	1✔
215	throw new ArgumentNullException(nameof(factoryExpr));	×
216
217	ParameterExpression	1✔
218	injector = factoryExpr.Parameters[0],	1✔
219	type = Expression.Parameter(typeof(Type), nameof(type));	1✔
220
221	return Expression.Lambda<FactoryDelegate>	1✔
222	(	1✔
223	factoryExpr.Body,	1✔
224	injector,	1✔
225	type	1✔
226	);	1✔
227	}	1✔
228	}
229	}

Sholtee / injector / 2251

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