!!! warning
    You can declare multiple `File` and `Form` parameters in a *path operation*, but you can't also declare `Body` fields that you expect to receive as JSON, as the request will have the body encoded using `multipart/form-data` instead of `application/json`.

    This is not a limitation of **FastAPI**, it's part of the HTTP protocol.

## Optional File Upload

!!! warning "Achtung"
    Sie können mehrere `File`- und `Form`-Parameter in einer *Pfadoperation* deklarieren, aber Sie können nicht gleichzeitig auch `Body`-Felder deklarieren, welche Sie als JSON erwarten, da der Request den Body mittels `multipart/form-data` statt `application/json` kodiert.

    Das ist keine Limitation von **FastAPI**, sondern Teil des HTTP-Protokolls.

## Optionaler Datei-Upload

## 导入 `File`

从 `fastapi` 导入 `File` 和 `UploadFile`：

```Python hl_lines="1"
{!../../../docs_src/request_files/tutorial001.py!}
```

## 定义 `File` 参数

创建文件（`File`）参数的方式与 `Body` 和 `Form` 一样：

```Python hl_lines="7"
{!../../../docs_src/request_files/tutorial001.py!}
```

!!! info "说明"

    `File` 是直接继承自 `Form` 的类。

    注意，从 `fastapi` 导入的 `Query`、`Path`、`File` 等项，实际上是返回特定类的函数。

    ```Python hl_lines="1"
    {!> ../../../docs_src/request_files/tutorial001.py!}
    ```

## Определите параметры `File`

Создайте параметры `File` так же, как вы это делаете для `Body` или `Form`:

=== "Python 3.9+"

    ```Python hl_lines="9"
    {!> ../../../docs_src/request_files/tutorial001_an_py39.py!}
    ```

=== "Python 3.6+"

    ```Python hl_lines="8"

## 🗄 `File`

🗄 `File` & `UploadFile` ⚪️➡️ `fastapi`:

```Python hl_lines="1"
{!../../../docs_src/request_files/tutorial001.py!}
```

## 🔬 `File` 🔢

✍ 📁 🔢 🎏 🌌 👆 🔜 `Body` ⚖️ `Form`:

```Python hl_lines="7"
{!../../../docs_src/request_files/tutorial001.py!}
```

!!! info
    `File` 🎓 👈 😖 🔗 ⚪️➡️ `Form`.

## `File` 임포트

`fastapi` 에서 `File` 과 `UploadFile` 을 임포트 합니다:

```Python hl_lines="1"
{!../../../docs_src/request_files/tutorial001.py!}
```

## `File` 매개변수 정의

`Body` 및 `Form` 과 동일한 방식으로 파일의 매개변수를 생성합니다:

```Python hl_lines="7"
{!../../../docs_src/request_files/tutorial001.py!}
```

!!! info "정보"
    `File` 은 `Form` 으로부터 직접 상속된 클래스입니다.