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> Use this file to discover all available pages before exploring further.
# IServiceCollection
> Extension methods for IServiceCollection from Microsoft.Extensions.DependencyInjection.Abstractions
## Definition
**Assembly:** Microsoft.Extensions.DependencyInjection.Abstractions.dll
**Namespace:** Microsoft.Extensions.DependencyInjection
## Syntax
```csharp theme={"dark"}
Microsoft.Extensions.DependencyInjection.IServiceCollection
```
## Summary
This type is defined in Microsoft.Extensions.DependencyInjection.Abstractions.
## Remarks
See [Microsoft documentation](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection) for more information about the rest of the API.
## Methods
### AddChainedService Extension
Extension method from `Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions`
A Restier-specific method that adds a "service contributor", which has a chance to chain previously registered service instances.
DO NOT use this method outside of a Restier app.
#### Syntax
```csharp theme={"dark"}
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddChainedService(Microsoft.Extensions.DependencyInjection.IServiceCollection services, System.Func factory, Microsoft.Extensions.DependencyInjection.ServiceLifetime serviceLifetime = 0) where TService : class
```
#### Parameters
| Name | Type | Description |
| ----------------- | ------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| `services` | `Microsoft.Extensions.DependencyInjection.IServiceCollection` | The [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection) to register the *TService* with. |
| `factory` | `System.Func` | A factory method to create a new instance of service TService, wrapping previous instance."/>. |
| `serviceLifetime` | `Microsoft.Extensions.DependencyInjection.ServiceLifetime` | The [ServiceLifetime](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime) of the service being added. |
#### Returns
Type: `Microsoft.Extensions.DependencyInjection.IServiceCollection`
The *services* instance modified with the new *TService* reference.
#### Type Parameters
* `TService` - The service type to register with the [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection).
#### Remarks
This process is being deprecated. Please DO NOT rely on it for future behavior in your own apps. V2 will properly handle
multiple instances of a registration by firing them in succession.
### AddChainedService Extension
Extension method from `Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions`
A Restier-specific method that adds a "service contributor", which has a chance to chain previously registered service instances.
DO NOT use this method outside of a Restier app.
#### Syntax
```csharp theme={"dark"}
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddChainedService(Microsoft.Extensions.DependencyInjection.IServiceCollection services, Microsoft.Extensions.DependencyInjection.ServiceLifetime serviceLifetime = 0) where TService : class where TImplement : class, TService
```
#### Parameters
| Name | Type | Description |
| ----------------- | ------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| `services` | `Microsoft.Extensions.DependencyInjection.IServiceCollection` | The [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection) to register the *TService* with. |
| `serviceLifetime` | `Microsoft.Extensions.DependencyInjection.ServiceLifetime` | The [ServiceLifetime](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime) of the service being added. |
#### Returns
Type: `Microsoft.Extensions.DependencyInjection.IServiceCollection`
Current [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection)
#### Type Parameters
* `TService` - The service type to register with the [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection).
* `TImplement` - The implementation type.
#### Remarks
This process is being deprecated. Please DO NOT rely on it for future behavior in your own apps. V2 will properly handle
multiple instances of a registration by firing them in succession.
If want to cutoff previous registration, not define a property with type of TService or do not use it.
The contributor added will get an instance of *TImplement* from the container, i.e.
[IServiceProvider](https://learn.microsoft.com/dotnet/api/system.iserviceprovider), every time it's get called.
This method will try to register *TImplement* as a service with
[Transient](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime.transient) life time, if it's not yet registered. To override, you can
register *TImplement* before or after calling this method.
Note: When registering *TImplement*, you must NOT give it a
[ServiceLifetime](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime) that makes it outlives *TService*, that could possibly
make an instance of *TImplement* be used in multiple instantiations of
*TService*, which leads to unpredictable behaviors.
### AddEF6ProviderServices Extension
Extension method from `Microsoft.Extensions.DependencyInjection.RestierEntityFrameworkServiceCollectionExtensions`
This method is used to add entity framework providers service into container.
#### Syntax
```csharp theme={"dark"}
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddEF6ProviderServices(Microsoft.Extensions.DependencyInjection.IServiceCollection services) where TDbContext : System.Data.Entity.DbContext
```
#### Parameters
| Name | Type | Description |
| ---------- | ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- |
| `services` | `Microsoft.Extensions.DependencyInjection.IServiceCollection` | The [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection). |
#### Returns
Type: `Microsoft.Extensions.DependencyInjection.IServiceCollection`
Current [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection).
#### Type Parameters
* `TDbContext` - The DbContext type.
### AddEFCoreProviderServices Extension
Extension method from `Microsoft.Extensions.DependencyInjection.RestierEntityFrameworkServiceCollectionExtensions`
This method is used to add entity framework providers service into container.
#### Syntax
```csharp theme={"dark"}
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddEFCoreProviderServices(Microsoft.Extensions.DependencyInjection.IServiceCollection services, System.Action optionsAction = null) where TDbContext : Microsoft.EntityFrameworkCore.DbContext
```
#### Parameters
| Name | Type | Description |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- |
| `services` | `Microsoft.Extensions.DependencyInjection.IServiceCollection` | The [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection). |
| `optionsAction` | `System.Action` | An optional action to configure the Microsoft.EntityFrameworkCore.DbContextOptions |
| for the context. This provides an alternative to performing configuration of | | |
| the context by overriding the Microsoft.EntityFrameworkCore.DbContext.OnConfiguring(Microsoft.EntityFrameworkCore.DbContextOptionsBuilder) | | |
| method in your derived context. | | |
| If an action is supplied here, the Microsoft.EntityFrameworkCore.DbContext.OnConfiguring(Microsoft.EntityFrameworkCore.DbContextOptionsBuilder) | | |
| method will still be run if it has been overridden on the derived context. Microsoft.EntityFrameworkCore.DbContext.OnConfiguring(Microsoft.EntityFrameworkCore.DbContextOptionsBuilder) | | |
| configuration will be applied in addition to configuration performed here. | | |
| In order for the options to be passed into your context, you need to expose a | | |
| constructor on your context that takes Microsoft.EntityFrameworkCore.DbContextOptions\`1 | | |
| and passes it to the base constructor of Microsoft.EntityFrameworkCore.DbContext. | | |
#### Returns
Type: `Microsoft.Extensions.DependencyInjection.IServiceCollection`
Current [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection).
#### Type Parameters
* `TDbContext` - The DbContext type.
### HasService Extension
Extension method from `Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions`
Return true if the [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection) has any *TService* service registered.
#### Syntax
```csharp theme={"dark"}
public static bool HasService(Microsoft.Extensions.DependencyInjection.IServiceCollection services) where TService : class
```
#### Parameters
| Name | Type | Description |
| ---------- | ------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| `services` | `Microsoft.Extensions.DependencyInjection.IServiceCollection` | The [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection) to register the *TService* with. |
#### Returns
Type: `bool`
A [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) specifying whether or not the *TService*
#### Type Parameters
* `TService` - The service type to register with the [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection).
### HasServiceCount Extension
Extension method from `Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions`
Returns the number of services that match the given [ServiceType](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.servicedescriptor.servicetype) in a given [ServiceCollection](https://learn.microsoft.com/dotnet/api/microsoft.extensions.dependencyinjection.servicecollection).
#### Syntax
```csharp theme={"dark"}
public static int HasServiceCount(Microsoft.Extensions.DependencyInjection.IServiceCollection services) where TService : class
```
#### Parameters
| Name | Type | Description |
| ---------- | ------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| `services` | `Microsoft.Extensions.DependencyInjection.IServiceCollection` | The [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection) to register the *TService* with. |
#### Returns
Type: `int`
An [Int32](https://learn.microsoft.com/dotnet/api/system.int32) representing the number of Services that match the given ServiceType.
#### Type Parameters
* `TService` - The service type to register with the [IServiceCollection](/restier/api-reference/Microsoft/Extensions/DependencyInjection/IServiceCollection).