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An open class or an open struct can use a type parameter in any member declaration, either directly or via a type constructed from one of the type parameters. For example, class Sample<T> { private Stack<T> Pending = new Stack<T>(); // Stack<T> is constructed from T public void Process(T Datum) {} // a parameter of type T private void Method() {T Local = default(T);} // a local variable of type T } The preceding code uses the new default keyword, which solves a potential problem with generics. As you know, an uninitialized field declaration like T Field; declares a field that will be filled with 0x00 bytes. However, an uninitialized local variable declaration like T Local; declares ... an uninitialized variable, which is an error to read. In C# 1.0, while we can set a reference to null, a number to 0, a boolean to false, or a struct to new StructName(), there is no way that we can write code that will fill any local variable with 0x00 bytes, nor is there a way to write code that can test if any variable has its default value. The default keyword allows you to do this. For any type T, default(T) will return the default value, whether that s null, 0, false, or new T(). Thus, in the preceding Sample<T>.Method method, T Local = default(T); creates an initialized local variable, no matter what type T may be.

a property for specifying a URL for an image file. Listing 10-1 shows the foundational code for the Web Part built in C#, and Listing 10-2 shows the code in VB .NET. Listing 10-1. Starting a Web Part in C# using System; using System.Web.UI; using System.Web.UI.WebControls.WebParts; namespace CViewer { public class Frame:WebPart { } } Listing 10-2. Starting a Web Part in VB .NET mports System Imports System.Web Imports System.Web.UI.WebControls.WebParts Public Class Frame Inherits WebPart End Class ASP .NET 2.0 Web Parts are still based on the concept of a server control, just like SharePoint 2003 Web Parts. Therefore, they have essentially the same life cycle as I outlined in 5. There are differences, however, in the names of the methods and attributes used within the class module. For example, ASP.NET 2.0 Web Parts have a RenderContents method instead of a RenderWebPart method. Aside from the name, everything else about these methods is the same. You still use an HtmlTextWriter to generate the output that will be displayed to the user. Although the names of some of the methods are different, some are still the same. For example, you can still override the CreateChildControls method to add your own controls to the Web Part. Creating properties for Web Parts in ASP .NET 2.0 is also nearly identical to SharePoint 2003. Again, the only real difference is in the naming; ASP .NET 2.0 attributes have different names than their SharePoint 2003 counterparts. For example, declaring that a property is WebBrowsable will allow its properties to be edited in the PropertyGridEditorPart, which I ll cover later in the chapter. Listing 10-3 shows the viewer Web Part in C#, and Listing 10-4 shows the code in VB .NET. Listing 10-3. The Completed Web Part in C# using System; using System.Web.UI; using System.Web.UI.WebControls.WebParts;

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Note You must precede the site URL with either http:// or https://, depending on whether your SharePoint site uses a secure connection or not. If you do not know which to use, you can try both, or you can ask your system administrator.

No type aliases C# does not have anything like Delphi s type statement: you can t declare an alias for a complex constructed type like type DataArray = Dictionary<DateTime, SampleData> and then pass parameters of type DataArray, or declare variables of type DataArray and populate them with a new DataArray(). Rather, somewhat as with array types, you have to include the whole type definition every time you refer to it. For example, you declare a parameter with a closed constructed type as, say, public void Function(Dictionary<DateTime, SampleData> Data) {} and you declare and initialize a field as, say, private Dictionary<DateTime, SampleData> Data = new Dictionary<DateTime, SampleData>(); This can get bulky and hard to read, and one might be tempted to characterize it unkindly as the typical C tradeoff: fewer lines ... of harder to read code. However, my experience so far has been that the angle brackets tend to cluster around relatively low-level code, and that generics make for smaller, faster application code that more than justifies a bit of ugliness at the bottom. Also, though looking ahead a little bit, C# 3.03 is slated to do a bit more type inference than 2.0 does. If you declare the type of an initialized local variable as var, the compiler will infer the

Do not change the contents of the File of type field. Word fills in this field, as will most applications, based on the types of files the application recognizes. If you change this field to display other file types, any attempt to open those files may fail. When you click Open with the URL of a library specified as shown in Figure 4-5, Word displays the Word documents stored in that library, as shown in Figure 4-6.

3. In alpha before 2.0 RTM-ed!

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