在 PowerShell 中过滤 TreeView 节点

我的 TreeView 中有大量节点，并且有一个文本框可以过滤它们以突出显示匹配的搜索。然而，它有点混乱，因为它显示了所有其他节点，并且在我更改搜索后，它使所有节点都展开。

我正在尝试做这样的事情，https://www.codeproject.com/Tips/1000621/Filtering-and-Hiding-Tree-Nodes-WinForms https://www.codeproject.com/Tips/1000621/Filtering-and-Hiding-Tree-Nodes-WinForms但我正在使用 Windows 表单/Powershell ISE，并且似乎很难将其实现到我自己的代码中。

对于关闭节点，我尝试使用 (Textbox.textlength -eq 0) 的方式来触发关闭所有节点功能，但这不起作用。

Here is what I want it too look like. Left is what I want, Right is what mine looks like.

这是我正在使用的搜索功能的示例。

Add-Type -AssemblyName System.Windows.Forms

function GetNodes([System.Windows.Forms.TreeNodeCollection] $nodes)
{
     foreach ($n in $nodes) {
        $n
        GetNodes($n.Nodes)
     }
}

$form = New-Object System.Windows.Forms.Form
$form.Text ="Test"
$form.Controls.AddRange(@(
    ($txt = [System.Windows.Forms.TextBox] @{
        Location = [System.Drawing.Point]::new(8, 8);
        Width = 100;
    }),
    ($btn = [System.Windows.Forms.Button] @{
        Location = [System.Drawing.Point]::new(120, 8);
        Width = 50;
        Text = "Search";
    }),
    ($tree = [System.Windows.Forms.TreeView] @{
        Location = [System.Drawing.Point]::new(8, 40);
        Width = 170;
        HideSelection = $false
    })
))
$form.AcceptButton= $btn

$tree.Nodes.Add("A1", "A1")
$tree.Nodes.Add("A2", "A2")
$tree.Nodes[0].Nodes.Add("A11", "A11")
$tree.Nodes[0].Nodes.Add("A12", "A12")
$tree.Nodes[1].Nodes.Add("A21", "A21")
$tree.Nodes[1].Nodes.Add("A22", "A22")

$btn.Add_Click({param($sender,$e)
    $nodes = GetNodes($tree.Nodes)
    foreach ($node in $nodes) {
        if($node.Text -like $txt.Text){
            $tree.SelectedNode = $node
            $node.EnsureVisible()
            break
        }
     }
})
$form.ShowDialog() | Out-Null
$form.Dispose()

假设您正在搜索文件夹结构等数据源，这就是我要做的：

• 创建一个函数以将所有目录的列表递归地获取到列表中
• 创建一个函数来过滤目录列表并返回名称中包含特定文本的目录列表。
• 创建一个函数来填充树视图
• 创建一个函数来突出显示包含特定文本的树节点

然后在文本框的文本更改事件中，我将过滤并突出显示树：

这是代码：

Add-Type -AssemblyName System.Windows.Forms

function GetPaths($root)
{
    Get-ChildItem $root -Recurse -Directory | % {
        $_.FullName.Replace($root, "").Trim("\")} 
}

function FilterPaths($paths, $like)
{
    $paths | ? {$_ -like "*$like*"} | % {
        $i = $_.LastIndexOf("$like", [System.Globalization.CompareOptions]::IgnoreCase)
        if($i -gt -1) {
            $j = $_.IndexOf("\", $i, [System.Globalization.CompareOptions]::IgnoreCase)
            if($j -gt -1) {
                $_.SubString(0,$j)
            } else {
                $_
            }
        }
    } 
}

function GetNodes($nodes)
{
     foreach ($n in $nodes) {
        $n
        GetNodes($n.Nodes)
     }
}

function HighlightNodes($nodes, $like)
{
    if(!$like){ return }
    $nodes | ? {$_ -like "*$like*"} | % {
            $_.BackColor = "Yellow"
    }
}

function PopulateTree($treeView, $paths)
{
    $treeView.Nodes.Clear()
    foreach ($path in $paths)
    {
        $lastNode = $null
        $subPathAgg = ""
        foreach ($subPath in ($path -split '\\'))
        {
            $subPathAgg += ($subPath + '\')
            $nodes = $treeView.Nodes.Find($subPathAgg, $true)
            if ($nodes.Length -eq 0) {
                if ($lastNode -eq $null) {
                    $lastNode = $treeView.Nodes.Add($subPathAgg, $subPath)
                } else {
                    $lastNode = $lastNode.Nodes.Add($subPathAgg, $subPath)
                }
            } else {
                $lastNode = $nodes[0]
            }
        }
    }
}

$form = New-Object System.Windows.Forms.Form
$form.Text ="Test"
$form.Controls.AddRange(@(
    ($txt = [System.Windows.Forms.TextBox] @{
        Location = [System.Drawing.Point]::new(8, 8);
        Width = $form.ClientSize.Width - 16;
        Anchor = [System.Windows.Forms.AnchorStyles]13
    }),
    ($tree = [System.Windows.Forms.TreeView] @{
        Location = [System.Drawing.Point]::new(8, 40);
        Width = $form.ClientSize.Width - 16;
        Anchor = [System.Windows.Forms.AnchorStyles]15
        Height = 200;
        HideSelection = $false
    })
))
$form.AcceptButton= $btn
$root = "C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\ItemTemplates\CSharp"
$paths = GetPaths $root
PopulateTree $tree $paths
$tree.ExpandAll()

$txt.Add_TextChanged({param($sender,$e)
    $tree.BeginUpdate()
    $like = $txt.Text
    $filtered = FilterPaths $paths $like
    PopulateTree $tree $filtered
    HighlightNodes (GetNodes $tree.Nodes) $like
    $tree.ExpandAll()
    $tree.TopNode = $tree.Nodes[0]
    $tree.EndUpdate()
})
$form.ShowDialog() | Out-Null
$form.Dispose()