Powershell 将字符串搜索结果附加到现有csv文件

我想在多个文件夹中搜索包含特定字符串的文件。每个文件夹的名称都列在一个csv文件thelist.csv中，该文件有一个标题列表1。我想将搜索结果附加到list.csv，为FileName Result1和Directory Result2添加一列。我试图进入csv文件或excel工作表，以便最终确定哪些文件夹包含/不包含“TestString.txt”文件

示例代码：

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搜索缺少的字符串成功返回结果，包括文件名result1和目录result2。但是，我在将结果附加到csv文件时遇到问题。现在，我的代码从原始列表返回List1的空值。原始csv文件中唯一存在的数据是标题

您的代码试图从文件名中提取属性List1、Results1、Results2，但没有任何代码告诉它如何这样做，因此它们是空的

您正在尝试在循环内进行导出，删除文件并在每次搜索时覆盖它，这样它只会有一个结果

您可能需要处理一个搜索返回多个匹配文件的情况，这需要向CSV添加新行

我没有尝试过这段代码，但这种方法应该更接近您想要的：

# Import from single column file, calling the column 'List1', and process each line:
Import-Csv -LiteralPath C:\The\Path\thelist.csv -Header List1 | ForEach-Object {

    # store line with a name, for use later on
    $Line = $_

    # the folders coming in from the CSV are in the column 'List1', search them
    Get-ChildItem -LiteralPath $Line.List1 -Filter *TestString* -Recurse | ForEach-Object {


        # for each search result TestString.txt, make a hashtable 
        # representing a new line in the output CSV, with the new data,
        # and convert to PS Custom Object so it will work with Export-CSV later on.

        [PSCustomObject]@{
            'List1' = $Line.List1
            'Result1' = $_.Name
            'Result2' = $_.DirectoryName
        }
    }

    # at the end of both loops, export all the results in one go
} | Export-csv C:\The\Path\thelist2.csv -NoTypeInformation

# Import from single column file, calling the column 'List1', and process each line:
Import-Csv -LiteralPath C:\The\Path\thelist.csv -Header List1 | ForEach-Object {

    # store line with a name, for use later on
    $Line = $_

    # the folders coming in from the CSV are in the column 'List1', search them
    Get-ChildItem -LiteralPath $Line.List1 -Filter *TestString* -Recurse | ForEach-Object {


        # for each search result TestString.txt, make a hashtable 
        # representing a new line in the output CSV, with the new data,
        # and convert to PS Custom Object so it will work with Export-CSV later on.

        [PSCustomObject]@{
            'List1' = $Line.List1
            'Result1' = $_.Name
            'Result2' = $_.DirectoryName
        }
    }

    # at the end of both loops, export all the results in one go
} | Export-csv C:\The\Path\thelist2.csv -NoTypeInformation