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UNDERSTANDING EXPRESSIONS
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Figure 5.3 If an expression cannot be compiled, an error message is shown in the Preview tab. The value expression for the textbox 'txtSales' refers to the field 'Sale'. Report item expressions can only refer to fields within the current data set scope or, if inside an aggregate, the specified data set scope.
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When the exception references a report item, you can double-click on the exception text to navigate to the item and inspect it. Some error conditions are discovered only during runtime. For example, you may have an expression for a calculated field that results in a division-by-zero exception. The way in which runtime errors are reported depends on how the expression is used. If the expression is used to get the value of a textbox, #Error is shown in the textbox. Otherwise, the exception is ignored. For example, if you have an expression to conditionally change the color of a line item from black to red, and the expression errors out, it will be ignored and the line will be shown in black. The most common source of runtime errors, which will probably bite you at the beginning, is omitting the Value property when you reference dataset fields, for example, Fields!Sales as opposed to Fields!Sales.Value. Because Fields!Sales references an object of type field, you will get a runtime error with #Error as the textbox value without any other complaints from the Report Designer. Circular references are not allowed even if the expression scope is valid. For example, if textbox A references textbox B and textbox B references textbox A, you won t get a compilation error, but when the report is rendered, the value of B will be set to #Error. To make programming with expressions easier, RS exposes report items as collections referred to as the Report Services Object Model.
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To use expressions in your reports, you have to have a good grasp of the Report Object Model. Reporting Services offers a simplified object model, exposed in the form of global object collections that you can reference in your expressions. The Report Object Model can be referenced only internally, that is, from code running inside the report. You cannot instantiate a report object externally, as you might have been accustomed to doing with other reporting tools and applications. For example, Microsoft Access exposes its object model as an externally creatable object of type Access.Application that external callers can instantiate using OLE Automation.
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Figure 5.4 The Report Object Model is implemented in the Microsoft. ReportingServices.Processing assembly. It contains five object collections that you can access programmatically in expressions or custom code.
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At first, the inability to create and manipulate the Report Object Model from outside might seem restrictive. In my opinion, though, I see it as a compromise, given the other advantages that the Reporting Services architecture has to offer. You may understand this better if you consider the fact that the RS architecture is entirely server-based. The RS process lifetime is not controlled by the client application. Instead, Reporting Services runs in its own process and, thanks to its service-oriented architecture, any consumer capable of submitting HTTP GET and SOAP requests can access it. Because RS runs in its own process, it is not possible to instantiate an RS object locally. The object model is implemented in the Microsoft.ReportingServices.Processing assembly, under the Microsoft.ReportingServices.ReportProcessing. ReportObjectModel namespace, as shown in figure 5.4. You can find the Microsoft.ReportingServices.Processing assembly in the Report Server binary folder (C:\Program Files\Microsoft SQL Server\MSSQL\Reporting Services\ReportServer\bin) or in the Report Designer folder (C:\Program Files\Microsoft SQL Server\80\Tools\Report Designer). To browse the object model using the VS.NET Object Browser, create a new C# or VB.NET project, reference this assembly, and press Ctrl-Alt-J.
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