为什么.ToString( "000.0000" ) 给出一个 找不到重载错误？

Question

我试图使用 .ToString()格式化数字：如果我有4.44在字符串之后，数字必须为004.4400。当我单独使用 .ToString()时，一切正常工作，例如：

$B = 4.444
$C = $B.ToString("000.0000") -replace "," , "." 

但是，当我尝试在周期中使用.ToString()时，一切都出错了，我不知道为什么。

这是我的脚本：

$path = "C:UsersgeorgiDesktop5"
Get-ChildItem -Path "C:UsersgeorgiDesktop5" -PipelineVariable 'f' |
ForEach-Object{
  $Program_Name = "LH2113814_11111-300"
    $PrepareDate = (Get-Content -Path $f.FullName) | Select -Index 9
     $Date = $PrepareDate.Substring(31,4) + $PrepareDate.Substring(28,2)  + 
$PrepareDate.Substring(25,2) + $PrepareDate.Substring(36,8) 
   $A = (Get-Content -Path $f.FullName) | Select -Index 14
     $B = $A.Substring(43,5)
       $C = $B.ToString("000.0000") -replace ",","."
         $D = (Get-Content -Path $f.FullName) | Select -Index 20
           $E = $D.Substring(37,5)
             $F = "00" + $E + "0"
               $EXPORT = $Program_Name + $Date + $C + $F | Add-Content 
('C:UsersgeorgiDesktop5test.dat')
}

错误：

Cannot find an overload for "ToString" and the argument count: "1".
At line:8 char:12
+ $B.ToString("000.0000") -replace ".","," 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

Answer 1

在这些行中：

 $B = $A.Substring(43,5)
   $C = $B.ToString("000.0000") -replace ",","."

$B是String类型。该类型的ToString()成员函数不接受任何参数，这就是为什么它抱怨的原因。

我无法根据您发布的内容来分辨，但是也许您需要先将该字符串施放到float：

 $B = [float]$A.Substring(43,5)
   $C = $B.ToString("000.0000") -replace ",","."