ASP.NET Web PDF Document Viewer/Editor Control Library

The latest version of C# contains features that enhance this capability further. Several of the new C# 4.0 features make it easier to interact with Office and other Windows applications that use COM automation this was a weak spot in C# 3.0. The relative ease with which developers can reach outside the boundaries of managed code makes C# an attractive choice it offers all the benefits of managed execution, but retains the ability to work with any code in the Windows environment, managed or not.

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Painter paths make it possible to draw any shape you want, but the trick is to define a path surrounding a region. You can then stroke the path with a given pen and brush. A path can contain several closed regions; for instance, it is possible to represent an entire text string using a path. The path shown in Figure 7-14 is created in three steps. First, the QPainterPath object is created and the circle is added using the addEllipse method. This ellipse forms one closed region. QPainterPath path; path.addEllipse( 80, 80, 80, 80 );

Since C# favors general-purpose language features designed to be composed with one another, it often doesn t make sense to describe individual new features on their own. So rather than devoting sections or whole chapters to new features, we cover them in context, integrated appropriately with other, older language features. The section you re reading right now is an exception, of course, and the main reason is that we expect people already familiar with C# 3.0 to browse through this book in bookstores looking for our coverage of the new features. If that s you, welcome to the book! If you look in the Preface you ll find a guide to what s where in the book, including a section just for you, describing where to find material about C# 4.0 features. That being said, a theme unites the new language features in version 4: they support dynamic programming, with a particular focus on making certain interoperability scenarios simpler. For example, consider the C# 3.0 code in Example 1-3 that uses part of the Office object model to read the Author property from a Word document.

static void Main(string[] args) { var wordApp = new Microsoft.Office.Interop.Word.Application(); object fileName = @"WordFile.docx"; object missing = System.Reflection.Missing.Value;

To create an error template, click the Create Error Template link. This will not only create a new Error Template for you, but it will also populate it with the standard error message HTML you saw earlier. If you select Edit Templates, the ScriptManager control surface will open a basic HTML editor that you can use to customize your error template (see Figure 6-11).

object readOnly = true; Microsoft.Office.Interop.Word._Document doc = wordApp.Documents.Open(ref fileName, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing); object docProperties = doc.BuiltInDocumentProperties; Type docPropType = docProperties.GetType(); object authorProp = docPropType.InvokeMember("Item", BindingFlags.Default | BindingFlags.GetProperty, null, docProperties, new object[] { "Author" }); Type propType = authorProp.GetType(); string authorName = propType.InvokeMember("Value", BindingFlags.Default |BindingFlags.GetProperty, null, authorProp, new object[] { }).ToString(); object saveChanges = false; doc.Close(ref saveChanges, ref missing, ref missing); Console.WriteLine(authorName);

}

Figure 7-14. A path has been filled. The next step is to add the quarter circle originating from the center of the full circle and stretching to the top and left. It is started at (100, 100), and you move to that point using a moveTo call. Then you draw a line straight up using lineTo before drawing an arc using addArc. The arc is drawn in a rectangle starting at (40, 40); that is, 160 pixels high and wide. It starts at 90 degrees and spans another 90 degrees counterclockwise. The region is then closed with a line that returns to the starting point. This forms another closed region.

That s some pretty horrible code it s hard to see what the example does because the goal is lost in the details. The reason it is so unpleasant is that Office s programming model is designed for dynamic languages that can fill in a lot of the details at runtime. C# 3.0 wasn t able to do this, so developers were forced to do all the work by hand. Example 1-4 shows how to do exactly the same job in C# 4.0. This is a lot easier to follow, because the code contains only the relevant details. It s easy to see the sequence of operations open the document, get its properties, retrieve the Author property s value, and close the document. C# 4.0 is now able to fill in all the details for us, thanks to its new dynamic language features.

static void Main(string[] args) { var wordApp = new Microsoft.Office.Interop.Word.Application(); Microsoft.Office.Interop.Word._Document doc = wordApp.Documents.Open("WordFile.docx", ReadOnly: true); dynamic docProperties = doc.BuiltInDocumentProperties; string authorName = docProperties["Author"].Value; doc.Close(SaveChanges: false); } Console.WriteLine(authorName);