Powershell里面一般处理异常分为中断类型和不可中断类型。前者一般是通过try..catch..finally处理，后者一般通过ErrorAction, ErrorVariable处理。
通过try..catch处理的时候有一个问题就是catch后面跟的异常，他的名字到底怎么获取的？
比如说我执行,他会报错，因为 nnnnn这个命令不存在。
PS C:\> a=nnnnn a=nnnnn : The term ‘a=nnnnn‘ is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:1 + a=nnnnn + ~~~~~~~ + CategoryInfo : ObjectNotFound: (a=nnnnn:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException
如果我想使用try ..catch捕获这个异常，如何知道这个异常的具体名字是什么？
可以通过$error这个变量来获取，最新的报错就是 $error[0], 通过他可以知道具体的Exception是什么，这样就可以有的放矢了。
PS C:\> $Error[0] | fl * -f
PSMessageDetails :
Exception : System.Management.Automation.CommandNotFoundException: The term ‘a=nnnnn‘ is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a
path was included, verify that the path is correct and try again.
at System.Management.Automation.CommandDiscovery.LookupCommandInfo(String commandName, CommandTypes commandTypes, SearchResolutionOptions searchResolutionOptions, CommandOrigin commandOrigin,
ExecutionContext context)
at System.Management.Automation.CommandDiscovery.LookupCommandProcessor(String commandName, CommandOrigin commandOrigin, Nullable`1 useLocalScope)
at System.Management.Automation.ExecutionContext.CreateCommand(String command, Boolean dotSource)
at System.Management.Automation.PipelineOps.AddCommand(PipelineProcessor pipe, CommandParameterInternal[] commandElements, CommandBaseAst commandBaseAst, CommandRedirection[] redirections,
ExecutionContext context)
at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][]
commandRedirections, FunctionContext funcContext)
at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
TargetObject : a=nnnnn
CategoryInfo : ObjectNotFound: (a=nnnnn:String) [], CommandNotFoundException
FullyQualifiedErrorId : CommandNotFoundException
ErrorDetails :
InvocationInfo : System.Management.Automation.InvocationInfo
ScriptStackTrace : at <ScriptBlock>, <No file>: line 1
PipelineIterationInfo : {}
比如这样就行了
PS C:\>
try{
a=nnnnn
}catch [System.Management.Automation.CommandNotFoundException]{
"error1"
}
error1
时间： 2024-10-27 08:08:29