zxing c# qr code example Overview of Management Tools in C#.NET

Generate QR Code in C#.NET Overview of Management Tools

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Overview of Management Tools
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Using the Special Features of Windows powerShell
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If you are thinking the WriteReadLine .ps1 script is a bit difficult, it is really only about as difficult as the VBScript version . The difference is you resorted to using arrays to work with the content you received from the Get-Content cmdlet . The VBScript version uses a FileSystemObject and a TextStreamObject to work with the data . In reality, you do not need to use a script exactly like the WhileReadLine .ps1 script to read the contents of the text file because the Get-Content cmdlet does this for you automatically . All you really have to do to display the contents of TestFile .t xt is use Get-Content . This command is shown here .
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Get-Content path c:\fso\TestFile.txt
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The results of the command are shown in Figure 13-26 .
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FIgURE 13-26 Get-Content reads and displays content from a text file .
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By not storing the results of the command in a variable, the contents are emitted automatically to the screen . The Get-Content command can be shortened further by using the GC alias (shortcut name for Get-Content) and by omitting the name of the path parameter (which is the default parameter) . When you do this, you create a command that resembles the following .
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GC c:\fso\TestFile.txt
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To find the available aliases for the Get-Content cmdlet, you use the Get-Alias cmdlet with the definition parameter . The Get-Alias cmdlet searches for aliases that have definitions that match Get-Content . Here is the command and the output you receive .
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PS C:\> Get-Alias Definition Get-content CommandType ----------Alias Alias Alias Name ---cat gc type Definition ---------Get-Content Get-Content Get-Content
In this section, you learned that you can use the while statement in Windows PowerShell to perform looping . You also learned that activities in VBScript that require looping do not always require you to use the looping behavior in Windows PowerShell, because some cmdlets automatically display information . Finally, you learned how to find aliases for cmdlets you frequently use .
Introduction to Windows PowerShell Scripting
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Using the do while Statement
The Do While Loop statement is often used when working with VBScript . This section covers some of the advantages of using the do while statement in Windows PowerShell, too . The DemoDoWhile .vbs script illustrates using the Do While statement in VBScript . The first thing you do is assign the value of 0 to the variable i . You then create an array . To do this, you use the Array function and assign the numbers 1 through 5 to the variable ary . You then use the Do While Loop construction to walk through the array of numbers . As long as the value of the variable i is less than the number 5, you display the value of the variable i. You then increment the value of the variable i and loop back around . The DemoDoWhile .vbs script is seen here .
DemoDoWhile.vbs i = 0 ary = Array(1,2,3,4,5) Do While i < 5 WScript.Echo ary(i) i = i + 1 Loop
When you run the DemoDoWhile .vbs script in Cscript at the command prompt, you see the numbers 1 through 5 displayed, as shown in Figure 13-27 .
FIgURE 13-27 The numbers 1 through 5 are displayed by the DemoDoWhile .vbs script when
it is run in Cscript .
You can do exactly the same thing using Windows PowerShell . The DemoDoWhile .ps1 script and the DemoDoWhile .vbs scripts are essentially the same . The differences between the two scripts are due to syntax differences between Windows PowerShell and VBScript . The first thing you do is assign the value of 1 to the variable $i. You then create an array of the numbers 1 through 5 and store that array in the $ary variable . You use a shortcut in Windows PowerShell to make this a bit easier . Actually, arrays in Windows PowerShell are fairly easy anyway . If you want to create an array, you just have to assign multiple pieces of data to the variable . To do this, you separate each piece of data by a comma, as seen here .
$ary = 1,2,3,4,5
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