Reference Type in visual C#.net

Generating Data Matrix in visual C#.net Reference Type

There must be some way to short-circuit the process, and the best way to do this is to introduce another object into the mix. In the object model thus far, what s missing is a class that actually represents the assignment of a resource to a project. At this point, there s no object responsible for assigning a resource to a project, so there s an entire behavior from the use cases that s missing in the object model. Additionally, there s data described in the use cases that isn t yet reflected in the object model, such as the role of a resource on a particular project, or the date that the resource was assigned to a project. These data fields can t be kept in the Project object, because a project will have many resources filling many different roles at different times. Similarly, they can t be kept in the Resource object, because a resource may be assigned to many projects at different times and in different roles.
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Figure 14-7. Explicit initialization of a one-dimensional array
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CHAPTER 10 ANIMATION
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The subsequent graphical operations are then performed on this pane object. To draw a line curve, you should use the PointPairList collection that the ZedGraph library provides. This allows you to create a single collection of data items that correspond to the X and Y values of a chart. The PointPairList supports many data types, including dates, so it s perfect for the example s needs. After the input parameters (ticker and days) have been read in and sanitized, the DataTier service is called to return a DataTable containing the results of the query for that stock and the number of days of price history you want for it. You then iterate through the DataTable and pull this information out like this:
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For reference type arrays, you still cannot change the iteration variable, but the iteration variable only holds the reference to the data, not the data itself. You can, therefore, change the data through the iteration variable. The following code creates an array of four MyClass objects and initializes them. In the first foreach statement, the data in each of the objects is changed. In the second foreach statement, the changed data is read from the objects. class MyClass { public int MyField = 0; } class Program { static void Main() { MyClass[] mcArray = new MyClass[4]; for (int i = 0; i < 4; i++) { mcArray[i] = new MyClass(); mcArray[i].MyField = i; } foreach (MyClass item in mcArray) item.MyField += 10; foreach (MyClass item in mcArray) Console.WriteLine("{0}", item.MyField); } } This code produces the following output: 10 11 12 13
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Cross-Silverlight Application Communication
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Figure 15-7. Result of removing a method from a delegate As with adding a method to a delegate, the resulting delegate is actually a new delegate. The new delegate is a copy of the old delegate but without the reference to the method that was removed. The following are some things to remember when removing methods: If there are multiple entries for a method in the invocation list, the -= operator starts searching at the end of the list and removes the first instance it finds of the matching method. Attempting to delete a method that is not in the delegate has no effect. Attempting to invoke an empty delegate throws an exception. You can check whether a delegate s invocation list is empty by comparing the delegate to null. If the invocation list is empty, the delegate is null.
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In this chapter you learned about some very common events and even some very new events that were included in the Silverlight 4. You even learned how to use them in a practical manner by making an application that allows you to add images to it by simply dragging then and dropping them right onto the application. There are more events that are now part of Silverlight that we will talk about when we discuss Out Of the Browser (OOB) applications in 14, such as the DragMove, DragResize, Maximize, Minimize, and Close events. In the next chapter I discuss Classes and Interfaces in depth, as mastery of these will ensure you will become a well-rounded Silverlight developer.
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CHAPTER 11 PARA METERIZE D FUNC TIONS AND TYPES
If we had attempted to use dir1 instead of DIR1 in the preceding example, we would have encountered the following error: ops$tkyte@ORA11GR2> declare 6 returning theclob into l_clob; 7 8 l_bfile := bfilename( "dir1", "test.txt" ); 9 dbms_lob.fileopen( l_bfile ); 15 end; 16 / declare * ERROR at line 1: ORA-22285: non-existent directory or file for FILEOPEN operation ORA-06512: at "SYS.DBMS_LOB", line 523 ORA-06512: at line 9 This is because the directory dir1 does not exist DIR1 does. If you prefer to use directory names in mixed case, you should use quoted identifiers when creating them as we did for dir2. This will allow you to write code as shown here: ops$tkyte@ORA11GR2> declare 2 l_clob clob; 3 l_bfile bfile; 4 begin 5 insert into demo values ( 1, empty_clob() ) 6 returning theclob into l_clob; 7 8 l_bfile := bfilename( "dir2", "test.txt" ); 9 dbms_lob.fileopen( l_bfile ); 10 11 dbms_lob.loadfromfile( l_clob, l_bfile, 12 dbms_lob.getlength( l_bfile ) ); 13 14 dbms_lob.fileclose( l_bfile ); 15 end; 16 / PL/SQL procedure successfully completed. There are methods other than the load from file routines by which you can populate a LOB using PL/SQL. Using DBMS_LOB and its supplied routines is by far the easiest if you are going to load the entire file. If you need to process the contents of the file while loading it, you may also use DBMS_LOB.READ on the BFILE to read the data. The use of UTL_RAW.CAST_TO_VARCHAR2 is handy here if the data you are reading is text, not RAW. You may then use DBMS_LOB.WRITE or WRITEAPPEND to place the data into a CLOB or BLOB.
realize that even though the type DispatcherImpl has knowledge about the IResolver implementations, external clients of DispatcherImpl use the Dispatcher type, meaning they will use the IResolver type. This has the end result that only one type has domain-specific knowledge. This finishes the discussion on the architecture of Client-Dispatcher-Server. Next you ll see how to implement this pattern.
CHAPTER 4 WORKING WITH MODELS
2. If the user allows access to the device, we first set the source of MyVideoBrush to CapSrc:
Using Service Contracts
Figure 14-11. Shortcut first-level instantiation You cannot instantiate more than the first-level array in the declaration statement. Allowed int[][] jagArr = new int[3][4]; Not allowed
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