powershell十进制[int]未失败
我正在尝试验证应将其用作成功代码的整数值的字符串。如果我从具有某些无效值的数组开始,那么……
$test = @(0, 100, -200, 3.3, 'string')
foreach ($item in $test) {
if ($item -isnot [Int]) {
Write-Host "![Int] $item"
} else {
Write-Host "[Int] $item"
}
}
我得到了预期的结果,前三个是[int]
,而最后两个则没有。
但是,如果我从字符串开始并构建数组,
$testString = '0, 100, -200, 3.3, string'
$test = $testString.Split(',').Trim()
那么所有测试都不是[int]
,这是有道理的,因为数组将是字符串。我需要先施放[int]
。但是当我这样做时,像
$testString = '0, 100, -200, 3.3, string'
$test = $testString.Split(',').Trim()
foreach ($item in $test) {
if ($item -as [Int] -isnot [Int]) {
Write-Host "![Int] $item"
} else {
Write-Host "[Int] $item"
}
}
[int]
一样,3.3返回。我发现 this ,这向我暗示我太聪明了,这对什么太聪明了我似乎正在尝试这样做。因此,是否有一种方法可以施放十进制INT和发生故障的小数,或者我需要两个条件,一个可以铸造和捕获真实的字符串,一种来寻找。
,从而找到小数?或者,也许要将[int]
的值与[单个]
这样的值进行比较?
$testString = '0, 100, -200, 3.3, string'
$test = $testString.Split(',').Trim()
foreach ($item in $test) {
if ($item -as [Int32] -isnot [Int32]) {
Write-Host "![Int] $item"
} else {
Write-Host "[Int] $item"
}
}
这是我设法上班的最优雅的方式,但是我想知道是否有更好的方法? 我还尝试了如果([int] $ item -isnot [int]){
,我认为是实际的铸件,而-as
在技术上是胁迫未能捕获小数,同时在字符串上丢下错误。因此,我认为我比我更了解铸造与胁迫要比我更了解,并且上面的工作代码与之一样好。希望对两者进行一些验证或反驳。
编辑:实际上,这仅是因为我的小数不是.0
。如果我想将3.0
标记为错误,以及3.3
,我真的需要像这样检查小数。
if (($item -as [Int] -isnot [Int]) -or ($item -like '*.*')) {
I am trying to validate a string of what should be comma separated integer values to use as success codes. If I start with an array with some invalid values, like this...
$test = @(0, 100, -200, 3.3, 'string')
foreach ($item in $test) {
if ($item -isnot [Int]) {
Write-Host "![Int] $item"
} else {
Write-Host "[Int] $item"
}
}
I get the expected results, the first three are [Int]
and the last two are not.
However, if I start from a string and build the array, like this
$testString = '0, 100, -200, 3.3, string'
$test = $testString.Split(',').Trim()
then all tests are not [Int]
, which makes sense because the array will be strings. I need to cast to [Int]
first. But when I do, like this
$testString = '0, 100, -200, 3.3, string'
$test = $testString.Split(',').Trim()
foreach ($item in $test) {
if ($item -as [Int] -isnot [Int]) {
Write-Host "![Int] $item"
} else {
Write-Host "[Int] $item"
}
}
3.3 is returning as [Int]
. I found this which clues me in that casting is too smart for what I am trying to do it seems. So, IS there a way to cast a decimal to int and get a failure, or do I need two conditionals, one to cast and catch the true strings, and one to look for .
and thus find the decimals? Or perhaps to compare the value of [Int]
with a cast to [Single]
like this?
$testString = '0, 100, -200, 3.3, string'
$test = $testString.Split(',').Trim()
foreach ($item in $test) {
if ($item -as [Int32] -isnot [Int32]) {
Write-Host "![Int] $item"
} else {
Write-Host "[Int] $item"
}
}
This is the most elegant way I have managed to get to work, but I wonder if there is actually a better approach?
I also tried if ([Int]$item -isnot [Int]) {
, which is I think an actual Cast, while -as
is technically Coercion, and that still fails to catch the decimal, while throwing an error on the string. So I am left thinking I understand Casting vs Coercion better than I did, and the working code above is as good as it gets. Hoping for some verification or refutation on both.
EDIT: Actually, that only works because my decimal is not .0
. If I want to flag 3.0
as an error as well as 3.3
I really need to check for the decimal instead, like so.
if (($item -as [Int] -isnot [Int]) -or ($item -like '*.*')) {
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