barcode vb.net code Specifies the category of activity to trace The PowerShell expression to trace in Visual C#.NET

Drawer Code39 in Visual C#.NET Specifies the category of activity to trace The PowerShell expression to trace

Specifies the category of activity to trace The PowerShell expression to trace
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Trace -Command [-Name] <String [] > [-Expression ] <ScriptBlock > [[ -Option ] <PSTraceSourceOptions >] [-ListenerOption <TraceOptions >] Specifies the code [-FilePath <String >] element to trace [-Debugger ] [-PSHost ] Controls the details of what is logged Specifies where the trace output goes
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Figure 9.4 The Trace-Command cmdlet parameters
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The -Option parameter controls the type of operation to call. Types of operations include specific .NET activities such as object construction, method calls, and property references as well as more general categories such as WriteLine , Verbose , and so on. A list of these options can be specified, and all of the categories mentioned will be displayed. Alternatively, if you specify the category All , everything will be shown (this is what is usually used). The last parameter to discuss is -Name. This parameter selects the category of the trace events to display. Although there are a large number of trace categories, there are really only two that are of interest to the script author: typeconversion and parameterbinding. We ll cover these in the next two sections. 9.5.2 Tracing type conversions First, we ll talk about tracing type conversions. Because automatic type conversion is so important in PowerShell, having a way of seeing exactly what s going on is very useful. Let s look at an example. We ll trace a simple conversion, from a string to a number:
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[int] "123"
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We re going to trace all of the activities, so we ll specify -Option all, and we want the output to go to the console, so we ll also specify -PShost. Here s what it looks like (this is all the output from one command, by the way!):
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PS (1) > trace-command -opt all typeconversion {[int] "123"} ` >> -pshost >> DEBUG: TypeConversion Information: 0 : Converting "int" to "System.Type".
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This is the first conversion taking the type literal [int] and resolving it to the instance of System.Type that represents an integer.
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DEBUG: TypeConversion Information: 0 getting BaseObject: "System.String". DEBUG: TypeConversion Information: 0 getting BaseObject: "System.String". DEBUG: TypeConversion Information: 0 conversion. DEBUG: TypeConversion Information: 0 integer to System.Enum. DEBUG: TypeConversion Information: 0 from string. DEBUG: TypeConversion Information: 0 System.Type : : : : : : Original type before Original type after Standard type Converting Type conversion Conversion to
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And we re done with step 1; we now have the type we need.
DEBUG: TypeConversion Information: 0 : The conversion is a standard conversion. No custom type conversion will be attempted. DEBUG: TypeConversion Information: 0 : Converting "123" to "System.Int32".
LOW-LEVEL TRACING
The next step is to figure out how to convert the string 123 into an integer.
DEBUG: TypeConversion Information: 0 : Original type before getting BaseObject: "System.String". DEBUG: TypeConversion Information: 0 : Original type after getting BaseObject: "System.String". DEBUG: TypeConversion Information: 0 : Standard type conversion. DEBUG: TypeConversion Information: 0 : Converting integer to System.Enum. DEBUG: TypeConversion Information: 0 : Type conversion from string. DEBUG: TypeConversion Information: 0 : Converting to integer. DEBUG: TypeConversion Information: 0 : The conversion is a standard conversion. No custom type conversion will be attempted.
This is a standard .NET type conversion, so no special steps are needed. The conversion is performed and finally we get the result as a number.
123 PS (2) >
Did you follow all that Remember what I said about this type of tracing being verbose I wasn t kidding. Let s look at a second example. Again, we ll trace everything and output to the console. This time, we ll trace casting a string into an [xml]. We ll also use the -ListenerOption parameter to say that we want to include the timestamp in the option. Here we go:
PS (6) > trace-command -opt all typeconversion -pshost ` >> -listen timestamp ` >> { [xml] '<h>Hi</h>' } >> DEBUG: TypeConversion Information: 0 : Converting "xml" to "System.Type". DEBUG: Timestamp=5536598202692
Again, the first step is to resolve the type literal. Note that timestamp information is now being output as we requested.
DEBUG: TypeConversion Information: 0 getting BaseObject: "System.String". DEBUG: Timestamp=5536598216733 DEBUG: TypeConversion Information: 0 getting BaseObject: "System.String". DEBUG: Timestamp=5536598230212 DEBUG: TypeConversion Information: 0 conversion. DEBUG: Timestamp=5536598243271 DEBUG: TypeConversion Information: 0 integer to System.Enum. DEBUG: Timestamp=5536598255383 DEBUG: TypeConversion Information: 0 : Original type before
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