| bag | 包含属性及其值（字符串）的属性包。 |
| cc | 检索值的上下文。 |
| converterFunc | 用于将字符串值转换为类型 T 的函数。 |
| defaultValue | 在属性包中找不到该属性时要返回的值。 |
| value | 如果可以获取该属性，则为转换函数转换后的获取值，如果获取值无法转换，则为默认值。 |
bool 如果可以获取到值，则为 true，否则为 false。
尝试从属性包中获取属性值。
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