Question

我正在编写一个程序来删除带有错误值的行。列名称事先是未知的，因此重要的是它们不是硬编码的。我正在尝试使用列标题作为数据结构的索引来读取CSV文件。我使用MemberType属性存储CSVs属性。这让我得到了名字而不是价值！

这是我的代码：

$data = .\hash_file.ps1
$csv = Import-Csv .\ps_test.csv

$properties = $csv | ForEach-Object { 
    $_ | Get-Member -MemberType Property, NoteProperty
}

foreach ($property in $properties) {
    "here is the column name: " + $property.Name
    "Here is the set of all values in [column, row]: " + $csv[$property.Name] #this does not return 
    foreach ($key in $data.Keys) {
        "Here is the set of all values to purge: " + $data[$key]
        if ($property.Name -eq $key -And $data[$key] -contains $property.Value){
            "Here is the purged property: " + $property.Value
        }
    }
}

以下是我的结果：

here is the column name: car
Here is the set of all values in [column, row]:#???
Here is the set of all values to purge: robert
Here is the set of all values to purge: nissan exterra
here is the column name: name
Here is the set of all values in [column, row]:#???
Here is the set of all values to purge: robert
Here is the set of all values to purge: nissan exterra
here is the column name: car
Here is the set of all values in [column, row]:#???
Here is the set of all values to purge: robert
Here is the set of all values to purge: nissan exterra
here is the column name: name
Here is the set of all values in [column, row]:#???
Here is the set of all values to purge: robert
Here is the set of all values to purge: nissan exterra

我的数据存储在这样的CSV中：

#ps_test.csv
name    car
----    -------
clay    nissan exterra
casey   honda accord
henry   nissan exterra
robert  truck

要清除的项目存储为哈希表中的列，值对：

#hash_file.ps1
@{
    "name" = @("robert");
    "car"  = @("nissan exterra")
}

以下是一个示例结果：

Here is the column name: name
Here is the set of all values in [column, row]:#???
Here is the set of all values to purge: robert
Here is the set of all values to purge: nissan exterra

应该读“名字”，“粘土”，“罗伯特”，“日产exterra”。但我不能得到“粘土”。

Answer 1

好吧，我有点喜欢你正在使用它以及它有多灵活，但你试图遍历行，并验证该行的属性，而你的脚本正在迭代所有属性所有行。让我们进行一些重组。

你通过加载哈希表和csv开始强大，我们会保留：

$data = .\hash_file.ps1
$csv = import-csv .\ps_test.csv

然而事情开始横行了。你想要做的是迭代每一行，所以让我们先去那里：

ForEach($Row in $CSV){

好的，现在对于该行，一旦导入它实际上是[PSCustomObject]，您可以通过引用PSObject隐藏属性来获取该对象的属性（也就是列名）。所以，让我们这样做：

$Row.PSObject.Properties.Name

整洁，它告诉我们我们正在处理的所有财产。然后我们可以在ForEach-Object循环中查看每个属性：

$Row.PSObject.Properties.Name | ForEach{
    "Column Name: $_"
    "Row value for $_`: " + $Row.$_
    "Values to purge for $_`: " + $Data[$_] -join ', '
    If($Row.$_ -in $Data[$_]){
        "Record purged: " + $Row
    }
}

所以，让我们把它们放在一起：

$data = .\hash_file.ps1
$csv = import-csv .\ps_test.csv
ForEach($Row in $CSV){
    $Row.PSObject.Properties.Name | ForEach{
        "Column Name: $_"
        "Row value for $_`: " + $Row.$_
        "Values to purge for $_`: " + $Data[$_] -join ', '
        If($Row.$_ -in $Data[$_]){
            "Record purged: " + $Row
        }
    }
}

这导致了我非常确定你想要的东西：

Column Name: Name
Row value for Name: clay
Values to purge for Name: robert
Column Name: Car
Row value for Car: nissan exterra
Values to purge for Car: nissan exterra
Record purged: @{Name=clay; Car=nissan exterra}
Column Name: Name
Row value for Name: casey
Values to purge for Name: robert
Column Name: Car
Row value for Car: honda accord
Values to purge for Car: nissan exterra
Column Name: Name
Row value for Name: henry
Values to purge for Name: robert
Column Name: Car
Row value for Car: nissan exterra
Values to purge for Car: nissan exterra
Record purged: @{Name=henry; Car=nissan exterra}
Column Name: Name
Row value for Name: robert
Values to purge for Name: robert
Record purged: @{Name=robert; Car=truck}
Column Name: Car
Row value for Car: truck
Values to purge for Car: nissan exterra

Answer 2

您可以使用其他方法动态处理csv的数据：

$data=@{
    name = [string[]]("robert");
    car  = [string[]]("nissan exterra", "toyota")
}

import-csv "c:\temp\ps_test.csv"  | %{
foreach ($key in $data.Keys)
{
   foreach ($value in $data[$key])
   {
      if ($_."$key" -EQ $value)
      {
          #you can purge here
          #$_."$key"=$null
      } 
   }
}

$_
}

Answer 3

我只能参与你想做的事情，但我希望这会有所帮助：

#step.ps1  -- steps through a csv file looking at each value

$data = .\hash-file.ps1
$csv = Import-Csv .\ps-test.csv

foreach ($row in $csv) {
    foreach ($column in $row.psobject.properties) {
        "Here is the column name: " + $column.name
        "Here is the current value: " + $column.value
        "Here is the set of all values to purge: " + $data[$column.name]
    }
}

这是我用于哈希文件的内容：

#hash-file.ps1

@{
    "name" = @("robert");
    "car" = @("nissan exterra")
}

这就是我用于csv文件的内容：

#ps-test.csv
name,car
clay,nissan exterra
casey,honda accord
henry,nissan exterra
robert, truck

请注意，我使用了连字符而不是下划线。请注意，csv文件中可以包含注释。

正如我所说，这只是其中的一部分，但我希望它有所帮助。

从列标题和PSMember属性中以CSV格式查找行值

3 个答案: