# Expansion for MCTag&lt;ItemDefinition&gt;

This expansion specifically targets itemTags. It adds implicit casters to IIngredient and IData, so that you can use them wherever you can use IIngredient.

 Only downside is that if you want to use Ingredient Transformers, you will need to call `asIIngredient()` first.

## Casters

| 结果类型                                                                   | 是否隐藏 |
| ---------------------------------------------------------------------- | ---- |
| [IData #数据](/vanilla/api/data/IData)                                   | true |
| [材料（IIngredient）](/vanilla/api/ingredient/IIngredient)                 | true |
| [IIngredientWithAmount](/vanilla/api/ingredient/IIngredientWithAmount) | true |

## 使用方式

:::group{name=add}

Return Type: void

```zenscript
MCTag.add(items as stdlib.List<IItemStack>) as void
```

| 参数    | 类型                                                                        | 描述                      |
| ----- | ------------------------------------------------------------------------- | ----------------------- |
| items | stdlib.List&lt;[IItemStack](/vanilla/api/item/IItemStack)&gt; | No Description Provided |


:::

:::group{name=asIData}

Return Type: [IData](/vanilla/api/data/IData)

```zenscript
// MCTag.asIData() as IData

<tag:items:forge:gems>.asIData();
```

:::

:::group{name=asIIngredient}

Return Type: [IIngredient](/vanilla/api/ingredient/IIngredient)

```zenscript
// MCTag.asIIngredient() as IIngredient

<tag:items:forge:gems>.asIIngredient();
```

:::

:::group{name=asIIngredientWithAmount}

Return Type: [IIngredientWithAmount](/vanilla/api/ingredient/IIngredientWithAmount)

```zenscript
// MCTag.asIIngredientWithAmount() as IIngredientWithAmount

<tag:items:forge:gems>.asIIngredientWithAmount();
```

:::




结果类型	是否隐藏
结果类型 IData #数据	是否隐藏 true
结果类型材料（IIngredient）	是否隐藏 true
结果类型 IIngredientWithAmount	是否隐藏 true