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You can also define your own exception objects to represent custom error conditions. All you need to do is create an instance of the appropriate exception class and then use the Throw statement. The next example introduces a modified DivideNumbers() method. It explicitly checks whether the specified divisor is 0 and then manually creates and throws an instance of the DivideByZeroException class to indicate the problem, rather than attempt the operation. Depending on the code, this pattern can save time by eliminating some unnecessary steps, or it can prevent a task from being initiated if it can t be completed successfully. Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load Try DivideNumbers(5, 0) Catch err As DivideByZeroException ' Report error here. End Try End Sub Private Function DivideNumbers(ByVal number As Decimal, _ ByVal divisor As Decimal) As Decimal If divisor = 0 Then Dim err As New DivideByZeroException() Throw err Else Return number/divisor End If End Function Alternatively, you can create a .NET exception object and specify a custom error message by using a different constructor: Private Function DivideNumbers(ByVal number As Decimal, _ ByVal divisor As Decimal) As Decimal If divisor = 0 Then Dim err As New DivideByZeroException( _ "You supplied 0 for the divisor parameter. You must be stopped.") Throw err Else Return number/divisor End If End Function In this case, any ordinary exception handler will still catch the DivideByZeroException. The only difference is that the error object has a modified Message property that contains the custom string. Figure 8-5 shows the resulting exception. birt pdf 417 Eclipse BIRT PDF417 Barcode Maker add-in makes PDF417 ...
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11 Dec 2012 ... Eclipse Birt Barcode Generator Add-In was developed exclusively by ... Supported matrix barcodes: QR Code, Data Matrix and PDF - 417 . You can also solve this problem in another way Rather than casting the reference manually, you can add the PreviousPageType directive to the aspx page that receives the cross-page postback (in this example, CrossPage2aspx), right after the Page directive The PreviousPageType directive indicates the expected type of the page initiating the cross-page postback Here s an example: <%@ PreviousPageType VirtualPath="~/CrossPage1aspx" %> Now, the PreviousPage property will automatically use the CrossPage1 type That allows you to skip the casting code and go straight to work using the previous page object, like this: protected void Page_Load(object sender, EventArgs e) { if (PreviousPage != null) { // (Read some information from the previous page) } } However, this approach is more fragile because it limits you to a single page class. java barcode scanner example code, rdlc pdf 417, data matrix excel add in, crystal reports barcode not showing, winforms upc-a reader, free barcode reader c# birt pdf 417 how to render PDF417 Barcode image in BIRT - TarCode.com
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26 Dec 2012 ... What I what ask is that is there easy ways to generate PDF417 barcodes in BIRT . What I know now is to use a third party control like a BIRT ... You don t have the flexibility to deal with situations where more than one page might trigger a cross-page postback For that reason, it s usually more flexible to use the casting approach Once you ve cast the previous page to the appropriate page type, you still won t be able to directly access the control objects it contains That s because the controls on the web page are not publicly accessible to other classes You can work around this by using properties For example, if you want to expose the values from two text boxes in the source page, you might add properties that wrap the control variables. birt pdf 417 Barcode Generator for BIRT | Generate barcodes in Eclipse BIRT ...
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Download PDF - 417 barcode generator for Java free trial package to create high quality PDF - 417 barcodes in Java class, iReport and BIRT . Figure 8-5. Standard exception, custom message Throwing an exception is most useful in component-based programming. In componentbased programming, your ASP.NET page is creating objects and calling methods from a class defined in a separately compiled assembly. In this case, the class in the component needs to be able to notify the calling code (the web application) of any errors. The component should handle recoverable errors quietly and not pass them up to the calling code. On the other hand, if an unrecoverable error occurs, it should always be indicated with an exception and never through another mechanism (such as a return code). For more information about componentbased programming, refer to 23. If you can find an exception in the class library that accurately reflects the problem that has occurred, you should throw it. If you need to return additional or specialized information, you can create your own custom exception class. Custom exception classes should always inherit from System.ApplicationException, which itself derives from the base Exception class. This allows .NET to distinguish between two broad classes of exceptions those you create and those that are native to the .NET Framework. When you create an exception class, you can add properties to record additional information. For example, here is a special class that records information about the failed attempt to divide by zero: Public Class CustomDivideByZeroException Inherits ApplicationException ' Add a variable to specify the "other" number. ' Depending on the circumstance, this might help diagnose the problem. Public DividingNumber As Decimal End Class For example, you can create a class named FastCar that inherits from Car and defines a getMaximumSpeed() method, as shown in Listing 1-2 Listing 1-2 Inheriting an Abstract Class class FastCar extends Car { function getMaximumSpeed() { return 150; } }. Here are two properties you could add to the CrossPage1 class to expose its TextBox controls: public TextBox FirstNameTextBox { get { return txtFirstName; } } public TextBox LastNameTextBox { get { return txtLastName; } } However, this usually isn t the best approach The problem is that it exposes too many details, giving the target page the freedom to read everything from the text in the text box to its fonts and colors If you need to change the page later to use different input controls, it will be difficult to maintain these properties Instead, you ll probably be forced to rewrite code in both pages A better choice is to define specific, limited methods or properties that extract just the information you need For example, you might decide to add a FullName property that retrieves just the text from the two text boxes. birt pdf 417 PDF - 417 Introduction, data, size, application, structure ...
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