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Since the value of the iteration variable is read-only, clearly it cannot be changed. But this has different effects on value type arrays and reference type arrays. For value type arrays, this means you cannot change the data of the array. For example, in the following code, the attempt to change the data in the iteration variable produces a compile-time error message: int[] arr1 = {10, 11, 12, 13}; foreach( int item in arr1 ) item++; // Compilation error. Changing variable value is not allowed. 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. So although you cannot change the reference, you can 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

4. 5. 6.

In a multidimensional array, the elements are processed in the order in which the rightmost index is incremented fastest. When the index has gone from 0 to length 1, the next index to the left is incremented, and the indexes to the right are reset to 0.

Layout in WPF Conventions The Layout Process Setting the Requested Size of Elements Alignment Padding and Margins Panels The StackPanel The WrapPanel The DockPanel The Grid The Canvas The UniformGrid The Sizes of an Object Summary

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The following example shows the foreach statement used with a rectangular array: class Program { static void Main() { int total = 0; int[,] arr1 = { {10, 11}, {12, 13} }; foreach( var element in arr1 ) { total += element; Console.WriteLine ("Element: {0}, Current Total: {1}", element, total); } } } This code produces the following output: Element: Element: Element: Element: 10, 11, 12, 13, Current Current Current Current Total: Total: Total: Total: 10 21 33 46

Click F5 to run the application. Click the Example 5 Edit JSON Link. This will open the film with ID 1. (If you have already deleted this film, update the Index view.) Modify some details and then click Update.

Before WPF, user interfaces generally consisted of windows with statically placed controls. The programmer set the height and width of a control and placed it at a certain coordinate position on the window or panel, where it stayed. (To be fair, you could also dock controls to edges.) In WPF, the layout of visual elements is much more dynamic. One of the goals of the WPF layout system is that visual elements should resize and rearrange intelligently when the size of the available window real estate changes. When a window grows or shrinks, the visual elements it contains should automatically change size and position appropriately. For example, Figure 5-1 shows a window where the buttons in the panel on the left rearrange depending on the amount of space available, and where the image in the right pane also changes size depending on the amount of space available. Generally, your UI will consist of one or more panels that contain visual elements. In this chapter, I ll describe the options WPF provides for setting the size and layout of your UI.

Since jagged arrays are arrays of arrays, you must use separate foreach statements for each dimension in the jagged array. The foreach statements must be nested properly to make sure that each nested array is processed properly. For example, in the following code, the first foreach statement cycles through the top-level array arr1 selecting the next subarray to process. The inner foreach statement processes the elements of that subarray. class Program { static void Main( ) { int total = 0; int[][] arr1 = new int[2][]; arr1[0] = new int[] { 10, 11 }; arr1[1] = new int[] { 12, 13, 14 }; foreach (int[] array in arr1) // Process the top level. { Console.WriteLine("Starting new array"); foreach (int item in array) // Process the second level. { total += item; Console.WriteLine(" Item: {0}, Current Total: {1}", item, total); } } } } This code produces the following output: Starting new array Item: 10, Current Item: 11, Current Starting new array Item: 12, Current Item: 13, Current Item: 14, Current

The film should now have been updated (if it hasn t, ensure that you have referenced the jQuery libraries in your master page as described in the section Changing the layout of ASP.NET MVC pages ). Note that you passed back the film property in the JSON object returned. That is how easy it is to update the model using client script.

Total: 10 Total: 21 Total: 33 Total: 46 Total: 60

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