避免对未知输入进行装箱/拆箱
我正在创建一个解析 XML 并检索一些数据的应用程序。每个 xml 节点指定数据 (const)、用于从中获取数据的记录集的列名 (var)、取决于某些条件 (enum) 和其他条件的可能数据值的子集。除了数据之外,它还可以指定向用户显示数据的格式。
问题是,对于每个节点类型,我需要以不同的方式处理值并执行一些 Actinons,因此,对于每个节点,我需要将返回值存储在临时变量中,以便稍后对其进行格式化...我知道我可以格式化就在那里并返回它,但这意味着重复我自己,我讨厌这样做。
所以,问题是:如何将要返回的值存储在临时变量中,同时在类型未知且无法使用泛型时避免装箱/拆箱?
PS:我正在设计解析器、XML 架构和将填充记录集的视图,因此对所有内容的更改都是合理的。
更新
我无法发布代码或 XML 值,但这是 XML 结构和实际标签。
<?xml version='1.0' encoding='utf-8'?>
<root>
<entity>
<header>
<field type="const">C1</field>
<field type="const">C2</field>
<field type="count" />
<field type="sum" precision="2">some_recordset_field</field>
<field type="const">C3</field>
<field type="const">C4</field>
<field type="const">C5</field>
</header>
<detail>
<field type="enum" fieldName="some_recordset_field">
<match value="0">M1</match>
<match value="1">M2</match>
</field>
<field type="const">C6</field>
<field type="const">C7</field>
<field type="const">C8</field>
<field type="var" format="0000000000">some_recordset_field</field>
<field type="var" format="MMddyyyy">some_recordset_field</field>
<field type="var" format="0000000000" precision="2">some_recordset_field</field>
<field type="var" format="0000000000">some_recordset_field</field>
<field type="enum" fieldName ="some_recordset_field">
<match value="0">M3</match>
<match value="1">M4</match>
</field>
<field type="const">C9</field>
</detail>
</entity>
</root>
I am creating an application that parses an XML and retrieves some data. Each xml node specifies the data (const), a recordset's column-name to get the data from (var), a subset of possible data values depending on some condition (enum) and others. It may also specify, alongside the data, the format in which the data must be shown to the user.
The thing is that for each node type I need to process the values differently and perform some actinons so, for each node, I need to store the return value in a temp variable in order to later format it... I know I could format it right there and return it but that would mean to repeat myself and I hate doing so.
So, the question: How can I store the value to return, in a temp variable, while avoiding boxing/unboxing when the type is unknown and I can't use generics?
P.S.: I'm designing the parser, the XML Schema and the view that will fill the recordset so changes to all are plausible.
Update
I cannot post the code nor the XML values but this is the XML structure and actual tags.
<?xml version='1.0' encoding='utf-8'?>
<root>
<entity>
<header>
<field type="const">C1</field>
<field type="const">C2</field>
<field type="count" />
<field type="sum" precision="2">some_recordset_field</field>
<field type="const">C3</field>
<field type="const">C4</field>
<field type="const">C5</field>
</header>
<detail>
<field type="enum" fieldName="some_recordset_field">
<match value="0">M1</match>
<match value="1">M2</match>
</field>
<field type="const">C6</field>
<field type="const">C7</field>
<field type="const">C8</field>
<field type="var" format="0000000000">some_recordset_field</field>
<field type="var" format="MMddyyyy">some_recordset_field</field>
<field type="var" format="0000000000" precision="2">some_recordset_field</field>
<field type="var" format="0000000000">some_recordset_field</field>
<field type="enum" fieldName ="some_recordset_field">
<match value="0">M3</match>
<match value="1">M4</match>
</field>
<field type="const">C9</field>
</detail>
</entity>
</root>
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您是否尝试过使用 var 类型?这样您就不需要知道每个节点的类型。此外,您的场景的一些小样本也会很有用。
Have you tried using the var type? That way you don't need to know the type of each node. Also, some small sample of your scenario would be useful.