PowerShell GUI脚本保存按钮异常添加内容问题已解决

问题场景 #

我开发了一款带GUI的PowerShell脚本，用于辅助编辑《军团要塞2》（TF2）MVM模式的pop文件。脚本已实现打开文件并在编辑区展示所有WaveSpawn区块的功能，但点击保存按钮时，会在保存修改后的WaveSpawn内容同时，额外重复写入原文件中WaveSpawn下方的所有内容，且无任何报错提示。

测试用Dummy Pop代码 #

用于复现问题的测试pop文件内容：

"PopFile"
{
    "WaveSpawn"
    {
        "wave" "1"
        "spawn_type" "normal"
        "max_waves" "1"
    }
    "BossWave"
    {
        "boss" "giant_heavy"
        "wave" "2"
    }
    "FinalWave"
    {
        "end_map" "1"
    }
}

问题根源与修复思路 #

原脚本的保存逻辑错误地将修改后的WaveSpawn内容与原文件全部内容合并写入，而非精准替换原文件中的WaveSpawn区块。修复核心是：

• 读取原文件完整内容，通过正则匹配定位所有WaveSpawn区块
• 用编辑后的WaveSpawn内容替换原区块，保留其他配置内容不变
• 确保最终仅将处理后的完整内容写入文件，避免重复追加

修正后的完整PowerShell脚本 #

Add-Type -AssemblyName System.Windows.Forms

# 初始化主窗口
$mainForm = New-Object System.Windows.Forms.Form
$mainForm.Text = "TF2 MVM Pop文件编辑器"
$mainForm.Size = New-Object System.Drawing.Size(800, 600)
$mainForm.StartPosition = "CenterScreen"

# 打开文件按钮
$openBtn = New-Object System.Windows.Forms.Button
$openBtn.Text = "打开Pop文件"
$openBtn.Location = New-Object System.Drawing.Point(20, 20)
$openBtn.Add_Click({
    $openFileDialog = New-Object System.Windows.Forms.OpenFileDialog
    $openFileDialog.Filter = "Pop Files (*.pop)|*.pop|所有文件 (*.*)|*.*"
    $openFileDialog.Title = "选择要编辑的Pop文件"
    if ($openFileDialog.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
        $global:popFilePath = $openFileDialog.FileName
        $fileContent = Get-Content $popFilePath -Raw

        # 提取所有WaveSpawn区块内容
        $waveSpawnPattern = '"WaveSpawn"\s*\{\s*[^}]*\s*\}'
        $waveSpawnMatches = [regex]::Matches($fileContent, $waveSpawnPattern, [System.Text.RegularExpressions.RegexOptions]::Singleline)
        $waveSpawnTextBox.Text = $waveSpawnMatches.Value -join "`n`n"
    }
})
$mainForm.Controls.Add($openBtn)

# WaveSpawn内容编辑框
$waveSpawnTextBox = New-Object System.Windows.Forms.TextBox
$waveSpawnTextBox.Location = New-Object System.Drawing.Point(20, 60)
$waveSpawnTextBox.Size = New-Object System.Drawing.Size(750, 300)
$waveSpawnTextBox.Multiline = $true
$waveSpawnTextBox.ScrollBars = "Vertical"
$waveSpawnTextBox.AcceptsReturn = $true
$waveSpawnTextBox.AcceptsTab = $true
$mainForm.Controls.Add($waveSpawnTextBox)

# 保存修改按钮
$saveBtn = New-Object System.Windows.Forms.Button
$saveBtn.Text = "保存修改"
$saveBtn.Location = New-Object System.Drawing.Point(20, 380)
$saveBtn.Add_Click({
    if (-not $global:popFilePath) {
        [System.Windows.Forms.MessageBox]::Show("请先打开一个Pop文件！", "操作提示", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Warning)
        return
    }

    $originalContent = Get-Content $global:popFilePath -Raw
    $modifiedWaveSpawn = $waveSpawnTextBox.Text.Trim()

    # 替换原文件中的所有WaveSpawn区块
    $waveSpawnPattern = '"WaveSpawn"\s*\{\s*[^}]*\s*\}'
    $newContent = [regex]::Replace($originalContent, $waveSpawnPattern, $modifiedWaveSpawn, [System.Text.RegularExpressions.RegexOptions]::Singleline)

    # 写入文件（UTF-8编码避免乱码）
    try {
        $newContent | Set-Content $global:popFilePath -Encoding UTF8 -Force
        [System.Windows.Forms.MessageBox]::Show("修改已成功保存！", "操作成功", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Information)
    }
    catch {
        [System.Windows.Forms.MessageBox]::Show("保存失败：$($_.Exception.Message)", "错误", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Error)
    }
})
$mainForm.Controls.Add($saveBtn)

# 启动窗口
$mainForm.ShowDialog() | Out-Null

内容的提问来源于stack exchange，提问作者Maselia