print barcode in vb.net EXPLORING THE REPORT OBJECT MODEL in C#

Generator PDF417 in C# EXPLORING THE REPORT OBJECT MODEL

EXPLORING THE REPORT OBJECT MODEL
Make PDF 417 In Visual C#
Using Barcode maker for .NET framework Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
PDF-417 2d Barcode Scanner In Visual C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Checking for missing fields To make dealing with missing values more confusing, the Field object exposes a property called IsMissing. It is important to note that it doesn t check for missing values. Instead, it returns true if the field is not found in the report dataset. If you trying to understand the practical use of this, consider the case when the report dataset is returned by a call to a stored procedure. For example, consider the Employee Sales by Territory report that we developed in the previous chapter to show employee performance. Users belonging to various security roles, such as administrators and clerks, can request this report. In the second case, you might not want to reveal the employee-sensitive information, such commissions and bonuses. You can hide these fields using expressions. Alternatively, you can pass a parameter to the spGetEmployeeSalesByProductSubcategory stored procedure to exclude these fields entirely. If you use the latter approach, you can use the IsMissing property to exclude these fields from expressions that use them. If you don t check whether they are available, they will show #Error. Finally, the Field object also implements an indexer. Currently, its implementation returns NULL. The next version of Reporting Services may include additional properties that data providers, such as the SQL Server .NET provider, could return. Using the Fields collection in expressions Here s an example showcasing the Fields collection. We ll change the Employee Sales by Territory with Summary Advanced report and replace the # Orders column with the Percentage of Employee s Total column. The new column will show the sales amount for each product subcategory as a percentage of the sales total, as shown in figure 5.8.
Barcode Maker In C#
Using Barcode creation for .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Code 39 Generation In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create Code 39 Extended image in .NET applications.
www.OnBarcode.com
Figure 5.8 Using the Fields collection to implement the calculated field Percentage of Employee s Total
QR Code 2d Barcode Creator In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Quick Response Code image in .NET applications.
www.OnBarcode.com
Generate UPC A In C#.NET
Using Barcode drawer for VS .NET Control to generate, create UPC-A image in .NET applications.
www.OnBarcode.com
USING EXPRESSIONS AND FUNCTIONS
Create Code 128 Code Set C In Visual C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code-128 image in VS .NET applications.
www.OnBarcode.com
Bookland EAN Drawer In Visual C#
Using Barcode printer for VS .NET Control to generate, create ISBN - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
To implement the new requirements, we have to change the expression of the corresponding textbox item to
PDF 417 Maker In .NET
Using Barcode maker for Reporting Service Control to generate, create PDF-417 2d barcode image in Reporting Service applications.
www.OnBarcode.com
PDF-417 2d Barcode Maker In None
Using Barcode creation for Microsoft Excel Control to generate, create PDF-417 2d barcode image in Excel applications.
www.OnBarcode.com
=Fields!Sales.Value/ReportItems!txtSalesTotal.Value
DataMatrix Creation In Java
Using Barcode generator for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
www.OnBarcode.com
Read UPC Symbol In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
To express the data as a percentage, we changed the textbox format accordingly. Another way of implementing Percentage of Employee s Total is to rewrite the above expression to use the txtSales report item, as follows:
UPC-A Supplement 5 Generation In Visual Basic .NET
Using Barcode encoder for VS .NET Control to generate, create UCC - 12 image in VS .NET applications.
www.OnBarcode.com
Decoding Barcode In C#
Using Barcode Control SDK for Visual Studio .NET Control to generate, create, read, scan barcode image in .NET applications.
www.OnBarcode.com
= ReportItems!txtSales.Value/ReportItems!txtSalesTotal.Value
EAN13 Drawer In None
Using Barcode maker for Font Control to generate, create GTIN - 13 image in Font applications.
www.OnBarcode.com
Making UPCA In Objective-C
Using Barcode generation for iPad Control to generate, create UPC A image in iPad applications.
www.OnBarcode.com
So, should we use the ReportItems or Fields collection In terms of performance, there is really not that much difference, because both are exposed internally as collections. However, if we need to use an aggregate or calculated result that is already available in a textbox, we would reference it using the ReportItems collection. For example, the above expression will produce the same result, if it is changed to
GTIN - 13 Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Code 39 Extended Creator In None
Using Barcode printer for Online Control to generate, create ANSI/AIM Code 39 image in Online applications.
www.OnBarcode.com
=Fields!Sales.Value/Sum(Fields!Sales.Value)
Barcode Encoder In None
Using Barcode creation for Office Excel Control to generate, create Barcode image in Microsoft Excel applications.
www.OnBarcode.com
GS1 DataBar Truncated Drawer In .NET Framework
Using Barcode printer for .NET Control to generate, create GS1 DataBar Stacked image in .NET framework applications.
www.OnBarcode.com
This expression, however, will calculate the sales total for each row in the tblEmployeeSales table, which is less efficient than getting the value from the txtSalesTotal textbox. 5.2.3 Using the Parameters collection The Parameters collection exposes the report parameters as objects of the type
Microsoft.ReportingServices.ReportProcessing.ReportObjectModel.Parameter. Each Parameter object has two publicly accessible read-only
properties: Label and Value. Using parameter labels and values As we saw in chapter 3, you can define a list of available values for a report parameter, and the list could be explicitly set or dataset-driven. Similarly to a drop-down control, if you decide to set available values, you can use a pair of values for each report parameter: a label for the visible portion and a value for the actual parameter value. For example, in the Sales by Territory Interactive report, we used the TerritoryID column from the dsTerritory dataset as the parameter value and the Territory column as the parameter value. In this case, the Label and Value parameters map to the parameter Label and Value properties, respectively. If you don t use available values, the Label property returns Nothing, while the Value property returns the parameter value. We have already seen examples that use the Parameters collection. For example, the Territory Sales Crosstab report has a subtitle (txtRange), which shows the requested date range using the passed parameter values. Implementing dynamic sorting Now look at another example that will demonstrate how we can leverage report parameters to implement dynamic sorting. We ll enhance the Sales by Territory report to sort the report data by category and sales. We saved the new version of the report as Sales by Territory with Sorting. EXPLORING THE REPORT OBJECT MODEL 157
Figure 5.9 Using the Parameters collection to implement dynamic sorting allows the user to specify which column to sort on and in which direction.
Figure 5.9 shows what our new sample report looks like. The table region in version 1.0 of Reporting Services doesn t support dynamic sorting, e.g., by clicking on the table header. However, we can get around this limitation by setting up report parameters that the user can pass to specify which column to sort on and in which direction. For this reason, we defined two report parameters: SortBy and Direction. Then, we set the Sorting tab in the table region properties, as shown in figure 5.10. We sorted the table region data by Territory first. Then, we used two expressions to dynamically sort by either category or sales, based on the user selection. For example, if the user has selected to sort by sales in descending order, the third expression result will evaluate to Sales and the direction to Descending. If the condition is not met, the expression will return zero, which makes the table region ignore the expression.
Copyright © OnBarcode.com . All rights reserved.