> ## Documentation Index
> Fetch the complete documentation index at: https://easyaf.nimbleapps.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# DataSourceStub

> Represents method stubs that identify API data source.

## Definition

**Assembly:** Microsoft.Restier.Core.dll

**Namespace:** Microsoft.Restier.Core

**Inheritance:** System.Object

## Syntax

```csharp theme={"dark"}
Microsoft.Restier.Core.DataSourceStub
```

## Summary

Represents method stubs that identify API data source.

## Remarks

The methods in this class are stubs that identify API data source
inside a query expression. This is a generic way to reference a
data source in API. Later in the query pipeline the sourcer from
the data provider will replace the stub with the actual data source.

## Methods

###  GetPropertyValue

Identifies the value of an extended property of an object.

#### Syntax

```csharp theme={"dark"}
public static TResult GetPropertyValue<TResult>(object source, string propertyName)
```

#### Parameters

| Name | Type | Description |
| - | - | - |
| `source` | `object` | A source object. |
| `propertyName` | `string` | The name of a property. |

#### Returns

Type: `TResult`
A representation of the value of the
extended property of the object.

#### Type Parameters

* `TResult` - The type of the result.

### &#x20;GetQueryableSource

Identifies an entity set, singleton or queryable data
resulting from a call to a composable function import.

#### Syntax

```csharp theme={"dark"}
public static System.Linq.IQueryable<TElement> GetQueryableSource<TElement>(string name, params object[] arguments)
```

#### Parameters

| Name | Type | Description |
| - | - | - |
| `name` | `string` | The name of an entity set, singleton or composable function import. |
| `arguments` | `object[]` | If *name* is a composable function import, |
| the arguments to be passed to the composable function import. | | |

#### Returns

Type: `System.Linq.IQueryable<TElement>`
A representation of the entity set, singleton or queryable
data resulting from a call to the composable function import.

#### Type Parameters

* `TElement` - The type of the elements in the queryable data.

### &#x20;GetQueryableSource

Identifies queryable data resulting
from a call to a composable function.

#### Syntax

```csharp theme={"dark"}
public static System.Linq.IQueryable<TElement> GetQueryableSource<TElement>(string namespaceName, string name, params object[] arguments)
```

#### Parameters

| Name | Type | Description |
| - | - | - |
| `namespaceName` | `string` | The name of a namespace containing the composable function. |
| `name` | `string` | The name of a composable function. |
| `arguments` | `object[]` | The arguments to be passed to the composable function. |

#### Returns

Type: `System.Linq.IQueryable<TElement>`
A representation of the queryable data resulting
from a call to the composable function.

#### Type Parameters

* `TElement` - The type of the elements in the queryable data.


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