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<%@ Page Language="C#" AutoEventWireup="true" Inherits="ForEach" %> CodeFile="ForEachaspxcs"
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>Foreach</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="Output" height="100" runat="server" TextMode="MultiLine" /> </div> </form> </body> </html>
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using System; public partial class ForEach : SystemWebUIPage { private string[] myArray;
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protected void Page_Load(object sender, EventArgs e) { myArray = new string[5]; myArray[0] = "More memory"; myArray[1] = "Sound card"; myArray[2] = "Monitor"; myArray[3] = "Terabytes drive"; myArray[4] = "Faster processor"; foreach (string s in myArray) { OutputText += s + "\n"; } } }
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As you can see in the output, the foreach loop marched right through the array and plucked out all of the strings and placed them in a TextBox field Also note the ASPNET portion of the application where the TextMode property is set to "MultiLine" This setting allows the output to be placed on separate lines as shown in Figure 3-5 Keep the foreach loop in mind for digging through a set of data that has been sent to an array Generally, the different controls in ASPNET can do a good job of dealing with data displays from a database, but for certain types of data analysis, you ll be glad you know how to work with the foreach loop
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Figure 3-5
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3: C# and ASPNET 35
While Loop
The while loop has two different implementations The first is as a loop that checks the condition at the top of the loop
ASPNET While LoopWhileaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="LoopWhileaspxcs" Inherits="WhileLoop" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>While Loop</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="Output" runat="server" Width="450" Height="30" /> </div> </form> </body> </html>
C# LoopWhileaspxcs
using System; public partial class WhileLoop : SystemWebUIPage { private int loopcount; protected void Page_Load(object sender, EventArgs e) { loopcount = 25; while (loopcount > 0) { OutputText += loopcount + "-"; loopcount--; } OutputText += "End of Loop"; } }
This loop has the condition right at the beginning If the loopcount variable is 0 or less, it will not iterate through the loop a single time, but will go immediately to the End Of Loop message However, because the counter variable is set to 25, it takes 25 iterations before the variable is 0 Figure 3-6 shows what you will see counting backwards
ASPNET 35: A Beginner s Guide
Figure 3-6
Output of while loop counting backwards
The important feature to keep in mind when using a while loop is that it will not iterate at all if the condition resolves to false on the first attempt to go through the loop The next section shows a similar loop but with one important difference
Do Loop
On some occasions, you need a loop that will iterate at least once, and this is where the do while (or just do) loop comes in handy The condition for checking termination is at the bottom of the loop, while the actions for the loop are at the top of the loop It has the structure
do { //Loop actions } while (condition);
As you can see, the actions occur before the while condition that evaluates a Boolean value So where you want some kind of action taken, even if the Boolean value resolves as false the first time through the loop, use the do loop The following example illustrates how this works
3: C# and ASPNET 35
ASPNET DoWhileaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DoWhileaspxcs" Inherits="DoWhile" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>Do Loop</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="Output" runat="server" Width="450" Height="30" /> </div> </form> </body> </html>
C# Do DoWhileaspxcs
using System; public partial class DoWhile : SystemWebUIPage { private int loopcount; protected void Page_Load(object sender, EventArgs e) { do { OutputText += loopcount + "-"; loopcount++; } while (loopcount < 25); OutputText += "Loop Ends"; } }
When you test the program, you will see the output in Figure 3-7 It looks like the others, but it has a significant difference The value in the first iteration is 0, the default value of an initialized integer type That occurred because the loopcount variable did not increment until after its value is placed in the text box that outputs the value to the screen Further, no matter what, in the first iteration it will put a value of the counter variable, even if it exceeds the conditional value That is, if the loopcount variable were
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