ASP.NET Web PDF Document Viewer/Editor Control Library

QSize size = spinBox.size(); QPoint upButton = QPoint( size.width()-2, 2 ); QPoint downButton = QPoint( size.width()-2, size.height()-2 ); QFETCH( QString, direction ); QFETCH( int, startValue ); spinBox.setValue( startValue ); if( direction.toLower() == "up" ) QTest::mouseClick( &spinBox, Qt::LeftButton, 0, upButton ); else if (direction.toLower() == "down" ) QTest::mouseClick( &spinBox, Qt::LeftButton, 0, downButton ); else QWARN( "Unknown direction - no clicks issued." ); QTEST( spinBox.value(), "endValue" ); } void SpinBoxTest::testClicks_data() { QTest::addColumn<QString>( "direction" ); QTest::addColumn<int>( "startValue" ); QTest::addColumn<int>( "endValue" ); QTest::newRow( QTest::newRow( QTest::newRow( QTest::newRow( } void SpinBoxTest::testSetting() { QSpinBox spinBox; spinBox.setRange( 1, 10 ); QFETCH( int, value ); spinBox.setValue( value ); QTEST( spinBox.value(), "endValue" ); } void SpinBoxTest::testSetting_data() { QTest::addColumn<int>( "value" ); QTest::addColumn<int>( "endValue" ); "Up" ) << "Up" << 5 << 6; "Down" ) << "Down" << 5 << 4; "Up, limit" ) << "Up" << 10 << 10; "Down, limit" ) << "Down" << 1 << 1;

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We could try to use this in a LINQ query:

var orders = from order in dbContext.SalesOrderHeaders where order.OrderDate == NextDay(orderDate) select order;

With LINQ to Objects this would work just fine it s all just C# code, and you can use any valid Boolean expression in a where clause, including expressions that invoke methods. But with LINQ to Entities, although this will compile, the EF will throw a NotSupportedException at the point at which you try to execute the query. Its error message will read:

LINQ to Entities does not recognize the method 'System.DateTime NextDay(System.DateTime)' method, and this method cannot be translated into a store expression.

QTest::newRow( "Valid" ) << 5 << 5; QTest::newRow( "Over" ) << 11 << 10; QTest::newRow( "Under" ) << 0 << 1; } The testClicks slot is similar to the testKeys slot, but you can t add a column for holding the QPoint to click because the point is calculated when you know the size of the widget being tested. A column called direction has been added instead. The direction can be either "Up" or "Down" (see Listing 16-20). The test case slot works as expected: It sets up the QSpinBox, uses QFETCH to get the input data, performs the task according to the data, and then evaluates using QTEST. What s new is that if it runs in to an unexpected direction, it uses the QWARN macro to inform the user. This warning does not affect the result of the test; it simply emits a warning in the log. Listing 16-20. Testing mouse interaction using a data-driven test case void SpinBoxTest::testClicks() { QSpinBox spinBox; spinBox.setRange( 1, 10 ); QSize size = spinBox.size(); QPoint upButton = QPoint( size.width()-2, 2 ); QPoint downButton = QPoint( size.width()-2, size.height()-2 ); QFETCH( QString, direction ); QFETCH( int, startValue ); spinBox.setValue( startValue ); if( direction.toLower() == "up" ) QTest::mouseClick( &spinBox, Qt::LeftButton, 0, upButton ); else if (direction.toLower() == "down" ) QTest::mouseClick( &spinBox, Qt::LeftButton, 0, downButton ); else QWARN( "Unknown direction - no clicks issued." ); QTEST( spinBox.value(), "endValue" ); } void SpinBoxTest::testClicks_data() { QTest::addColumn<QString>( "direction" ); QTest::addColumn<int>( "startValue" ); QTest::addColumn<int>( "endValue" ); QTest::newRow( "Up" ) << "Up" << 5 << 6; ... }

LINQ to Entities queries are limited to the things that the EF knows how to turn into database queries, and since it doesn t know anything about this NextDay method you ve

written, it can t work out how to do that. Of course, when you bear in mind that a LINQ to Entities query executes on the database, it s hardly surprising that you can t invoke arbitrary methods in your application from the middle of a query. But the EF integrates some database features into your code so seamlessly that it s sometimes easy to forget where the boundary between your application and the database lies.

Returns an array of strings indicating the data bindings for this control. Gets the data context for the binding associated with the control. Returns the ID for the control. Allows the access key for quick access to this control to be set or read. Returns an object reference to the associated element. Returns an array of strings indicating the behaviors associated with this control. Gets or sets the cssClass for this control. You can also use the various CSS methods of the control to manipulate its CSS class. Gets or sets whether the control is enabled. When true, the control is enabled; when false, the control is grayed out. Returns an object containing the element s style settings. Gets or sets the value of the control in the tab index. Gets or sets the visibility of the control. If true, the control is visible; if false, it is invisible. Returns a string containing the CSS definition for the object s visibility.

Because all IDictionary<TKey, TValue> implementations are also enumerable, we can run LINQ queries against them. Given the RecordCache class in Example 9-5, we might choose to implement the cache item removal policy as shown in Example 9-10.

The textSetting slot is converted in a similar manner and is not shown here. The result from the unit test is also unchanged. Tests are performed (and the results are presented) in the same way.

private void DiscardAnyOldCacheEntries() { // Calling ToList() on source in order to query a copy // of the enumeration, to avoid exceptions due to calling // Remove in the foreach loop that follows. var staleKeys = from entry in cachedRecords.ToList() where IsStale(entry.Value) select entry.Key; foreach (int staleKey in staleKeys) { cachedRecords.Remove(staleKey); } }

But it s also possible to create new dictionaries with LINQ queries. Example 9-11 illustrates how to use the standard ToDictionary LINQ operator.

IDictionary<int, string> buildingIdToNameMap = MyDataSource.Buildings.ToDictionary( building => building.ID, building => building.Name);