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In both methods, we just return the current AmazonBookSearch instance B because we are still working on the same query. You should notice an important thing here: Our operators are not receiving delegates as with our previous examples, but instances of the Expression<TDelegate> class C. As you saw in chapter 3, the System.Linq.Expressions.Expression<TDelegate> class can be used to retrieve an expression tree. In operators that receive a delegate as a parameter, we can t really do much more than execute the code the delegate points to. In comparison, the expression tree we receive in Where describes what is written in the where clause of a query as data instead of code. The point is that we ll be able to analyze the predicate expression tree received as a parameter by the Where method to extract the criteria specified in the query.



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Any idea using c# and iTextSharp can we compress pdf ... Using iTextSharp is possible you need to set the version of PDF and then, try this. Hide Copy Code ... Code . string pdfFile = @"D:\Test.pdf"; PdfReader reader = new ...

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Detect if a PDF File is a Portfolio in C# , VB.NET · Compress PDF Images in C# , VB. .... of the images in the PDF document by using the following code example.

The next logical step is to code the AmazonBookExpressionVisitor class used in Where D. This class is used to process an expression tree and extract the query criteria it contains. Before doing so, it s important to get an idea of what the expression tree contains. An expression tree is a hierarchy of expressions. Listing 12.11 shows the complete hierarchy received by the Where method.

You can use lazy loading to increase the performance of your user interface when constructing large lists or tree structures In this case, you can load the data when the user needs to see it, for example when a tree node is expanded..





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8 Jun 2018 ... Developers can compress PDF file size in C# . Reduce size with image and content in PDF , and be able to delete annotations and metadata in ...

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how to optimize pdf using c# programming. - CodeProject
Using iTextSharp is possible you need to set the version of PDF and then, try this ... string pdfFile = @"D:\Test. pdf "; PdfReader reader = new ...

var book = Expression.Parameter(typeof(AmazonBook), "book"); var expressionTree = Expression.Lambda<Func<AmazonBook, Boolean>>( Expression.AndAlso( Expression.AndAlso( Expression.AndAlso( Expression.Call( Expression.Property(book, typeof(AmazonBook).GetProperty("Title")), typeof(String).GetMethod("Contains"), new Expression[] { Expression.Constant("ajax", typeof(String)) } ), Expression.Equal( Expression.Property(book, typeof(AmazonBook).GetProperty("Publisher")), Expression.Constant("Manning", typeof(String)), false, typeof(String).GetMethod("op_Equality") ) ), Expression.LessThanOrEqual( Expression.Property(book, typeof(AmazonBook).GetProperty("Price")), Expression.Constant(25M, typeof(Decimal)) ) ), Expression.Equal( Expression.Convert( Expression.Property(book, typeof(AmazonBook).GetProperty("Condition")), typeof(int)), Expression.Constant(1, typeof(int) ) ) ), new ParameterExpression[] { book } );

If you look closely at this tree, you should be able to locate the criteria we ve specified in our query: the restriction on the title B, the filter on the publisher C, the price limit D, and the book condition E. As a reminder, here is the query for which this expression tree is generated:

from book in new LinqToAmazon.AmazonBookSearch() where book.Title.Contains("ajax") && (book.Publisher == "Manning") && (book.Price <= 25) && (book.Condition == BookCondition.New) select book;

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Sample C# code for using PDFTron SDK to reduce PDF file size by removing redundant information and compressing data streams using the latest in image ...

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You can t necessarily prevent these errors from happening, but when they happen you may want to take some specific action. For example, you might want to log the names of computers that can t be reached, or prompt for a different filename if the one specified can t be found. PowerShell offers you a number of ways to deal with these kinds of errors, and we ll cover the two most commonly used ways in this chapter.

The ProcessExpression method of the AmazonBookExpressionVisitor class should basically walk through the expression tree to extract information. Here we ll implement the Visitor design pattern to find all the criteria the expression tree contains. Here is the main method of the AmazonBookExpressionVisitor class, VisitExpression:

You can optimize your application s display speed in a number of different ways, according to the techniques you are using to display the user interface controls and application forms When your application starts, you should consider displaying as simple a user interface as possible This will decrease startup time and present an uncluttered and easy to use user-interface to the user Also, you should try to avoid referencing classes and loading any data at startup that is not immediately required This will improve the application and NET framework initialization time and improve the display speed of the application When you need to display a dialog box or form, you should keep them hidden until they are ready to be displayed, to reduce the amount of painting necessary This will help to ensure that the form is only displayed once it has been initialized.

private void VisitExpression(Expression expression) { if (expression.NodeType == ExpressionType.AndAlso) { ProcessAndAlso((BinaryExpression)expression); } else if (expression.NodeType == ExpressionType.Equal) { ProcessEqual((BinaryExpression)expression); } else if (expression.NodeType == ExpressionType.LessThanOrEqual) { ProcessLessThanOrEqual((BinaryExpression)expression); } else if (expression is MethodCallExpression) { ProcessMethodCall((MethodCallExpression)expression); } else if (expression is LambdaExpression) { ProcessExpression(((LambdaExpression)expression).Body); } }

We won t detail every method here. You can refer to the complete source code accompanying this book to see how all these methods are implemented. Just to give you an idea, here is the VisitAndAlso method:

private void VisitAndAlso(BinaryExpression andAlso) { VisitExpression(andAlso.Left); VisitExpression(andAlso.Right); }

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I only know the original PDFsharp , not the Xamarin port: images are deflated automatically using SharpZipLib. Make sure to use appropriate ...












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