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all callers have the required permission set, we need to elevate the code access security policy for both assemblies to full trust. This will require changes to the Report Designer and Report Server security configuration files. We will provide more details about how code access security works and how it can be configured in chapter 8. If you don t want to wait until then, you can find a copy of our rssrvpolicy.config configuration file enclosed with the AwRsLibrary project. Toward the end of the file, you will see two CodeGroup XML elements that point to the AwRsLibrary and OpenForecast files. You will need to copy these elements to the Report Server security configuration file (rssrvpolicy.config). In addition, as we discussed in chapter 2, if you want to preview (run) the report in the Preview window from the Report Designer, you will need to propagate the changes to the Report Designer security configuration file (rspreviewpolicy.config) as well. Once the custom assemlies are deployed, we will need to write some VB.NET embedded code in our report to call the AwRsLibrary assembly, as we will discuss next. Writing report embedded code To integrate the report with AwRsLibrary we added an embedded function called GetValue to the Sales by Product Category report as shown in listing 6.2.
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Listing 6.2 The embedded GetValue function calls the AwRsLibrary assembly.
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Dim forecastedSet() As Double ' array with sales data Dim productCategoryID As Integer = -1 Dim bNewSeries As Boolean = False Public Dim m_ExString = String.Empty Function GetValue(productCategoryID As Integer, _ orderDate As DateTime, _ sales As Double, reportParameters as Parameters, _ txtRange as TextBox) As Double Dim startDate as DateTime = reportParameters!StartDate.Value Dim endDate as DateTime = reportParameters!EndDate.Value Dim forecastedMonths as Integer = _ reportParameters!ForecastedMonths.Value If (forecastedSet Is Nothing) Then ReDim forecastedSet(DateDiff(DateInterval.Month, _ startDate, endDate) + forecastedMonths) Redim the array only once End If to hold existing sales data
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plus forecasted sales
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If Me.productCategoryID <> productCategoryID Then The array holds Me.productCategoryID = productCategoryID sales data per bNewSeries = True product category Array.Clear(forecastedSet, 0, forecastedSet.Length - 1) End If Dim i = DateDiff(DateInterval.Month, startDate , orderDate)
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CUSTOM CODE IN ACTION: IMPLEMENTING REPORT FORECASTING
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'Is this a forecasted value If orderDate <= endDate Then ' No, just load the value in the array forecastedSet(i) = sales Else If bNewSeries Then Try AWC.RS.Library.RsLibrary.GetForecastedSet(_ Call AwRsLibrary forecastedSet, _ to get the forecastedMonths) forecasted set bNewSeries = False Catch ex As Exception m_ExString = "Exception: " & ex.Message System.Diagnostics.Trace.WriteLine(ex.ToString()) throw ex End Try End If End If ' is it forecasted value Return forecastedSet(i) End Function
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Because the matrix region data cells use an expression that references the GetValue function, this function gets called by each data cell. Table 6.1 lists the input arguments that the GetValue function takes.
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Table 6.1 Each data cell inside the matrix region will call the GetValue embedded function and pass the following input arguments. Argument productCategoryID orderDate sales reportParameters Purpose The productCategoryID value from the rowProductCategory row grouping corresponding to the cell The orderDate value from the colMonth column grouping corresponding to the cell The aggregated sales total for this cell To calculate the array dimensions, GetValue needs the values of the report parameters. Instead of passing the parameters individually using Parameters!ParameterName.Value, we pass a reference to the report Parameters collection. A variable that holds the error message in case an exception occurs when getting the forecasted data
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txtRange
To understand how GetValue works, note that each data cell inside the matrix region is fed from the forecastedSet array. If the cell doesn t need forecasting (its corresponding date is within the requested date range), we just load the cell value in the array and pass it back to display it in the matrix region. To get this working, we need to initialize the array to have a rank equal to the number of requested months plus the number of forecasted months. Once the matrix region moves to a new row and calls 198
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