想要在 XML 文件的特定位置插入 XML 元素

Question

我有一个这样的 XML 文件

<RoadPart>
    <Vehicles>
                <ConfigurationSummaryListPosition>
                  <ConfigurationSummary>Test name</ConfigurationSummary>
                </ConfigurationSummaryListPosition>
    </Vehicles>
    <Vehicles>
                <ConfigurationSummaryListPosition>
                  <ConfigurationSummary>Test name</ConfigurationSummary>
                </ConfigurationSummaryListPosition>
    </Vehicles>
    <Vehicles>
                <ConfigurationSummaryListPosition>
                  <ConfigurationSummary>Test name</ConfigurationSummary>
                </ConfigurationSummaryListPosition>
    </Vehicles>
</RoadPart>

我想在 XML 上方我希望的位置插入下面的部分。

<Vehicles>
            <ConfigurationSummaryListPositionTest>
              <ConfigurationSummary>Test name</ConfigurationSummary>
            </ConfigurationSummaryListPositionTest>
</Vehicles>

假设我想在第二个位置插入 Vehicles 元素，那么结果将如下：

<RoadPart>
    <Vehicles>
                <ConfigurationSummaryListPosition>
                  <ConfigurationSummary>Test name</ConfigurationSummary>
                </ConfigurationSummaryListPosition>
    </Vehicles>
    <Vehicles> // My inserted data
                <ConfigurationSummaryListPositionTest> // My inserted data
                  <ConfigurationSummary>Test name</ConfigurationSummary> // My inserted data
                </ConfigurationSummaryListPositionTest> // My inserted data
    </Vehicles> // My inserted data
    <Vehicles>
                <ConfigurationSummaryListPosition>
                  <ConfigurationSummary>Test name</ConfigurationSummary>
                </ConfigurationSummaryListPosition>
    </Vehicles>
    <Vehicles>
                <ConfigurationSummaryListPosition>
                  <ConfigurationSummary>Test name</ConfigurationSummary>
                </ConfigurationSummaryListPosition>
    </Vehicles>
</RoadPart>

如何在特定位置插入车辆元素零件帮助我。

Answer 1

如果您知道要放置新元素之后的元素，请使用 XDocument.AddAfterSelf 方法 (MSDN)。或 XDocument.AddBeforeSelf 放置在给定元素之前。

Answer 2

试试这个：

XElement root = XElement.Parse(@"
    <RoadPart>
        <Vehicles>
            <ConfigurationSummaryListPosition>
                <ConfigurationSummary>Test name</ConfigurationSummary>
            </ConfigurationSummaryListPosition>
        </Vehicles>
        <Vehicles>
            <ConfigurationSummaryListPosition>
                <ConfigurationSummary>Test name</ConfigurationSummary>
            </ConfigurationSummaryListPosition>
        </Vehicles>
        <Vehicles>
            <ConfigurationSummaryListPosition>
                <ConfigurationSummary>Test name</ConfigurationSummary>
            </ConfigurationSummaryListPosition>
        </Vehicles>
    </RoadPart>
");
XElement toAdd = XElement.Parse(@"
    <Vehicles>
        <ConfigurationSummaryListPositionTest>
            <ConfigurationSummary>Test name</ConfigurationSummary>
        </ConfigurationSummaryListPositionTest>
    </Vehicles>
");
root.Elements().Skip(1).First().AddBeforeSelf(toAdd);

//Alternatively
root.Elements().Take(1).Last().AddAfterSelf(toAdd);

---

要插入多个元素，每个元素都有自己的索引：

（由于您还没有显示您的索引如何映射到要插入的元素，我假设为 Dictionary<int,XElement>。）

var dict = new Dictionary<int, XElement>() {
    {3, XElement.Parse("<Inserted id=\"1\" />")},
    {1, XElement.Parse("<Inserted id=\"2\" />")}
};

//We need parse the elements to insert in descending order, or else the indexes 
//will be affected by previous insertions
foreach (var kvp in dict.OrderByDescending(kvp => kvp.Key)) {
    if (kvp.Key == 0) {
        root.AddFirst(kvp.Value);
    } else {
        root.Elements().Take(kvp.Key).Last().AddAfterSelf(kvp.Value);
    }
}

注意：这将在不存在的索引上崩溃。