消除根节点和第一个子节点后，从 xml 读取并绑定到树视图

Question

我有一个结构的xml文件

<MainList>
<number>5<number/>
<first id="1" name="test" />
<second/>
<third/>
<MainList/>

现在我想通过消除“MainList”和“number”在树视图中显示它

我希望树以格式显示

first
  id
  name
second
third

我现在正在使用 xmlreader

Answer 1

根据此处@AS-CII (Binding hierarchical xml to treeview) 提供的答案，您可以修改此处发布的代码以满足您的需求。

1. 跳过根元素和第一个子元素
2. 将一级-TreeNodes 直接添加到Nodes-TreeView 的集合中（因为没有根元素）
3. 为Attribute 和Element 创建TreeNode

例如：

private void Form1_Load ( object sender, EventArgs e )
{
    string xml = "<MainList><number>5</number><first id=\"1\" name=\"test\" /><second/><third/></MainList>";
    XDocument doc = XDocument.Parse ( xml );
    var elements = doc.Root // "MainList"
        .Elements () // Elements inside "MainList"
        .Skip ( 1 ); // Skip first item ("number")
    // Add a TreeNode for each element on first level (inside MainList)
    foreach ( var item in elements )
    {
        // Create first-level-node
        TreeNode node = new TreeNode ( item.Name.LocalName );
        // Create subtree, if necessary
        TreeNode[] nodes = this.GetNodes ( node, item ).ToArray ();
        // Add node with subtree to TreeView
        treeView1.Nodes.AddRange ( nodes );
    }
}

上面的代码使用以下方法从 XML 文档的元素和属性创建 TreeNodes：

private IEnumerable<TreeNode> GetNodes ( TreeNode node, XElement element )
{
    List<TreeNode> result = new List<TreeNode> ();
    // First, create TreeNodes for attributes of current element and add them to the result
    if ( element.HasAttributes )
        result.AddRange ( node.AddRange (
            from item in element.Attributes ()
            select new TreeNode ( "[A] " + item.Name.LocalName ) ) );
    // Next, create subtree and add it to the result
    if ( element.HasElements )
        result.AddRange ( node.AddRange ( 
            from item in element.Elements ()
            let tree = new TreeNode ( item.Name.LocalName )
            from newNode in GetNodes ( tree, item )
            select newNode ) );
    // If there aren't any attributes or subelements, return the node that was originally passed in
    if ( result.Count == 0 )
        result.Add ( node );
    // Return the result 
    return result;
}

另外，你需要这个扩展方法：

public static class TreeNodeEx
{
    public static IEnumerable<TreeNode> AddRange ( this TreeNode collection, IEnumerable<TreeNode> nodes )
    {
        collection.Nodes.AddRange ( nodes.ToArray () );
        return new[] { collection };
    }
}