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=Fields!LastName.Value =Fields!Color.Value = Fields!FirstName.Value+ +Fields!LastName.Value
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A control flow or a decision expression is one that, based on one or more conditions, returns a value to change the formatting or displayed value of the report. SSRS supports three control flow functions: IIF, Switch, and Choose. The following table lists some examples of conditional formatting.
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=Choose(Fields!NameStyle.Value, Mr , Mrs , Miss ) =IIF(Fields!Amount.Value < 0, Red , Black ) =Switch(Fields!Amount.Value< 0.90*Fields!Goal.Value, Red , Fields!Amount.Value<Fields!Goal.Value, Yellow , Fields!Amount.Value>=Fields!Goal.Value, Green )
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built-in function Built-in function expressions use built-in report functions to configure the property. In addition to the control flow functions, SSRS includes Text, Date & Time, Math, Inspection, Program Flow, Aggregate, Financial, Conversion, and Miscellaneous functions to help you create expressions. The following table lists some examples of built-in-functions.
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Value Value
=Sum(Fields!Quantity.Value) =(Rate(Fields!TotPmts.Value, - Fields!Payment.Value, Fields!PVal.Value) * 12) * 100
In addition to these expressions, you can use the .NET Framework and reference proprietary embedded functions to extend the functionality of your reports.
using the <Code> Element in a Report
In addition to using the standard functions provided with SSRS, you might want to create your own embedded functions. The main advantages of using embedded code are extensibility and reusability, because the code embedded at the report level can extend SSRS functions and be reused in any expression of the report. You write embedded code in Visual Basic. In addition to custom functions, you can also add custom constants and variables to your report. To add a <code> element at the report level, follow these steps:
1. 2. 3.
In the Report Designer, click the Design tab. From the Report menu, select Report Properties to open the Report Properties dialog box. Click the Code tab.
Lesson 2: Using Expressions to Perform Advanced Report Item Formatting
Write the function by using Visual Basic code. For example, you can define a custom color version of your report by using the following code:
Function GetStockColor(ByVal Stock AS Short, ByVal Level AS Short) As String Dim returnValue As String returnValue = "" Select Case (100*Stock)/Level Case Is < 80 returnValue = "Red" Case Is < 100 returnValue = "Yellow" Case Is >= 100 returnValue = "Green" End Select Return returnValue End Function
This function generates a personalized color based on the stock and minimum stock level parameters. After you create an embedded function, you can use the function in any expression. Use the Code prefix to reference the function. For example, you can use the following expression to assign the BackgroundColor property:
=Code.GetStockColor(Fields!Quantity.Value, Fields!ReorderPoint.Value)
Extending SSRS with Custom Assemblies
Instead of adding custom code to a report directly, you can create a custom assembly and reference it from multiple reports. Thus, custom assemblies provide even more reusability than embedded code. In addition, when you write custom assemblies, you are not limited to Visual Basic; you can use other .NET languages, such as Visual C#. Before you can start using code from a custom assembly in your report, you have to deploy the assembly. To deploy a custom assembly, copy the assembly file to the application folders of your SSRS server and the Report Designer. You can also install your custom assembly in the global assembly cache (GAC). Custom assemblies are granted Execution permission by default; this allows code execution in the scope of the report itself. If your code needs resources outside that scope for example, if the code reads a file from the file system or a value from the registry you must grant the assembly additional privileges. To grant these additional permissions, you need to edit the rssrvpolicy.config configuration file for the report server and the rspreviewpolicy.config configuration file for the Report Designer.
Extending and Deploying SSRS Reports
Here are the general steps for deploying a custom assembly in SSRS:
Copy your custom assembly to the report server bin folder and the Report Designer folder. The default location of the bin folder for the report server is C:\Program Files\ Microsoft SQL Server\MSRS10.MSSQLSERVER\Reporting Services\ReportServer\bin\. The default location of the Report Designer folder is C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\. If you need to add additional privileges beyond the default Execution permission, you need to change the two configuration files mentioned earlier. The default location of rssrvpolicy.config is C:\Program Files\Microsoft SQL Server\MSRS10.MSSQLSERVER\ Reporting Services\ReportServer\. The default location of rspreviewpolicy.config is C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\. Add a code group for your custom assembly. Custom assemblies are controlled through .NET code access security. For information about custom assemblies and code access security, see the topics Using Custom Assemblies with Reports and Code Access Security in Reporting Services in SQL Server 2008 Books Online (see References).
Sometimes you have to update an assembly that is already referenced by reports. If the assembly already exists in the deployment folders of the report server and the Report Designer and you increment the version number of the assembly, the reports that reference that assembly will no longer work properly. You need to update the version of the assembly referenced in the CodeModules element of the report definition and then republish the reports. If you did not change any code elements already referenced in the published reports say, you simply added a new function to your assembly and left the existing code unchanged consider using the same version number for the updated assembly. If your published reports do not need to use the new functions from the updated assembly, consider deploying your custom assembly to the GAC. Because the GAC maintains multiple versions of an assembly, your currently published reports can reference the first version of your assembly, and your new reports can reference the updated version. Before you start using code from your custom assembly, you must also add a reference to the assembly in your report. In addition, if you use the assembly in embedded custom code and this code references .NET Framework classes that are not in System.Math or System.Convert namespaces, you must also provide references to .NET Framework assemblies so that the Report Processor can resolve the names. To add a reference to an assembly in a report, follow these steps:
1. 2. 3.
In the Report Designer, click the Design tab. From the Report menu, select Report Properties. Click the References tab.
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