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Lesson 3: Monitoring Performance
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CAUTION UseShellExecute
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If a username and password are specified, the UseShellExecute property must be set to false.
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Start Processes with Command-Line Arguments
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Specifying command-line arguments to start a process is similar to starting a process without them. The first example in the previous section illustrated using the ProcessStartInfo to start a process. The ProcessStartInfo class has an Arguments property that allows you to specify as many arguments as are needed. To specify them, simply insert each one with a space in between them. In the previous section, the Arguments property was not specified, which allowed the process to be started without any command-line arguments. To specify command-line arguments, use the following code, which needs the System.Diagnostics namespace:
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' VB Dim Info as New ProcessStartInfo() Info.FileName = this.tbProcessName.Text Info.Arguments = "EACH OF THESE WORDS IS AN ARGUMENT" Process.Start(Info) // C# ProcessStartInfo Info = new ProcessStartInfo(); Info.FileName = this.tbProcessName.Text; Info.Arguments = "EACH OF THESE WORDS IS AN ARGUMENT " ; Process.Start(Info);
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This code will produce the output illustrated in Figure 10-15.
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Figure 10-15 Output using the phrase EACH OF THESE WORDS IS AN ARGUMENT as command-line arguments
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Instrumentation
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If the ProcessStartInfo class is used, the only necessary step is to specify the Arguments property:
' VB Dim Info As New ProcessStartInfo() Info.FileName = Me.tbUserName.Text If Me.tbArguments.Text <> String.Empty Then Info.Arguments = Me.tbArguments.Text End If If Me.tbUserName.Text <> String.Empty Then Dim SecurePassword As New System.Security.SecureString() For i As Int32 = 0 To Me.tbPassword.Text.Length - 1 SecurePassword.AppendChar(Convert.ToChar(Me.tbPassword.Text(i))) Info.UseShellExecute = False Info.UserName = Environment.UserName Info.Password = SecurePassword Return Next i ElseIf tbPassword.Text <> String.Empty Then MessageBox.Show("If a UserName is provided, a Password must be provided as well") End If If Me.tbDomain.Text <> String.Empty Then Info.Domain = Me.tbDomain.Text End If If Me.tbProcessName.Text <> String.Empty Then Info.FileName = Me.tbProcessName.Text Process.Start(Info) End If // C# ProcessStartInfo Info = new ProcessStartInfo(); Info.FileName = this.tbProcessName.Text; if (this.tbArguments.Text != string.Empty) { Info.Arguments = this.tbArguments.Text; } if (this.tbUsername.Text != String.Empty) { SecureString SecurePassword = new SecureString(); for (Int32 i = 0; i < this.tbPassword.Text.Length; i++) { SecurePassword.AppendChar(Convert.ToChar(this.tbPassword.Text[i])); } //Set UseShellExecute to false if you specify a username Info.UseShellExecute = false; Info.UserName = Environment.UserName; Info.Password = SecurePassword; } else { MessageBox.Show("If a UserName is provided, a Password must be provided as well");
Lesson 3: Monitoring Performance
return; } if (this.tbDomain.Text != String.Empty){ Info.Domain = this.tbDomain.Text; } if (this.tbProcessName.Text != string.Empty) { Process.Start(Info); }
The StackTrace and StackFrame Classes
The StackTrace class allows you to see the state of the .NET runtime s call stack at a given point in time. Although a full discussion of the call stack mechanism is beyond the scope of this discussion, we ll touch upon it briefly. Each time a method is called, a StackFrame is added and pushed onto the stack. Each subsequent method is pushed onto the stack to be executed in last-in, first-out order. When there are no more methods to be called, each method is executed and popped (removed) from the stack. So by examining the StackTrace and vicariously its StackFrames, a tremendous amount of information about the state of the application can be discerned. However, the StackFrame class is intended to help support .NET Framework methods and is not intended to be used directly. A brief overview of the constructors of the StackFrame class is shown in Table 10-7.
Table 10-7 The StackFrame Class Constructors
Constructor StackTrace Constructor () StackTrace Constructor (Boolean) StackTrace Constructor (Exception) StackTrace Constructor (Int32) StackTrace Constructor (StackFrame) StackTrace Constructor (Exception, Boolean)
Available Parameters [None] fNeedFileInfo e skipFrames frame e fNeedFileInfo
StackTrace Constructor (Exception, Int32)
e skipFrames
10
Instrumentation
Table 10-7
The StackFrame Class Constructors
Constructor StackTrace Constructor (Int32, Boolean)
Available Parameters skipFrames fNeedFileInfo
StackTrace Constructor (Thread, Boolean)
targetThread fNeedFileInfo
StackTrace Constructor (Exception, Int32, Boolean)
e skipFrames fNeedFileInfo
Every time an exception is thrown by the .NET runtime, the Exception object s current StackTrace property is set to the current StackTrace. If the assembly where the exception is thrown has Debug symbols loaded, this information can be viewed. Examine the following code snippet:
' VB Try Dim x as Int32 = 1 x = x - 1 Dim i as Int32 = 10 \ x Catch Problem as DivideByZeroException Debug.Assert(False, Problem.StackTrace) End Try // C# try { Int32 x = 1; x--; Int32 i = 10 / x; } catch (DivideByZeroException Problem) { Debug.Assert(false, Problem.StackTrace); }
After the Exception object is caught, the code intentionally causes a Debug assertion to fail so that the StackTrace can be viewed. The resulting output will look like that shown in Figure 10-16.
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