generate qr code in c#.net Figure 5-6 Getting help from IntelliSense by typing in a period (.) after a valid object in Visual C#.NET

Generator QR Code JIS X 0510 in Visual C#.NET Figure 5-6 Getting help from IntelliSense by typing in a period (.) after a valid object

Figure 5-6 Getting help from IntelliSense by typing in a period (.) after a valid object
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TO USE INTELLISENSE 1 form.
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From the toolbox, drag a button control to the
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4 word, IntelliSense should bring up textBox1.
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Press the Tab key to insert the component. Type a period ( . ) again, type text, then press
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Start typing textbox. Before you finish the
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2 click event handler in the code editor. Then,
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Double-click the button to bring up the button
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where the cursor is blinking, press CTRL+Spacebar. The IntelliSense window will open. Type the letter t, h and normally you should
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5 the Tab key or the Spacebar. The code line
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should look like this one:
this.textBox1.Text
3 be on this in IntelliSense. Press Tab and then
period (.).
6 literal Hello World ; in the end, the line
should look like this:
this.textBox1.Text = Hello World ;
Now add the equal sign (=) and the string
You can now build and execute the application by pressing F5 and verify that it works. When you click the button you created, you should get the string Hello World in TextBox1, which normally should be the first one of the three text boxes. You can also get additional help from IntelliSense if there s more than one available choice for your situation. Typing a left parenthesis ("(") displays a list of all possible choices. For instance, when we did the console application, we wrote to the console using the Console.WriteLine method. We used this method with a string argument, but you can do more with Console.WriteLine than just use a string as an argument. IntelliSense will indicate if there is more than one option. For Console.WriteLine, IntelliSense indicates there are 19 possible variations, as you can see in Figure 5-7. I was looking for the second variation, which is a Boolean argument. Now it s your turn to try it.
5: Creating Your First Full Windows Application
Know that at any time while you re using IntelliSense, you can press the Tab key to move quickly through the selections Intellisense presents if the item you re looking for is already selected.
Figure 5-7 IntelliSense gives you the list of all possible variations of using the WriteLine method
TO SELECT FROM A LIST OF OPTIONS IN INTELLISENSE 1 Form1.cs. Add a new line in the Button1_Click event and type MessageBox.Show and then type a left
parenthesis ( ( ). The IntelliSense Window opens and shows there are 21 possible variations for MessageBox. Show. Scroll through the list of options using the up or down arrows on your keyboard. Select the option If the source code is not visible, just click on the tab over the code editor where you see the filename
2 identified by the 1 of 21 in the yellow rectangle, which is called a tooltip. 3 Complete the following line of code so that it looks like:
MessageBox.Show("Hello Again");
4 and then a dialog box should show up with the message Hello Again..
Build and execute the application. When you click the button you should see the Hello World string
IntelliSense Filtering: Pre-Selecting the "Most Recently Used"
You might have noticed that when the IntelliSense window appears, except for the first time you invoke it, you immediately jump to an element in the list. This element has been preselected by IntelliSense because it s the most recently used construct. Therefore, to be more productive, IntelliSense picks it up automatically to save you some typing. Another type of filtering is selection based purely on the context you re in at the moment of the invocation. If you re in the code for handling an exception, say in a catch statement in a try-catch block, then IntelliSense will present you the exception types. That s IntelliSense filtering at its best.
Microsoft Visual C# 2005 Express Edition: Build a Program Now!
IntelliSense Code Snippets: The Time Saver
The next IntelliSense feature is IntelliSense code snippets. Code snippets were invented for only one reason developer productivity. They are a big part of the new IntelliSense features. The code snippets in C# are related to language constructs but can be extended. In Visual C# you can add code snippets in two ways: you can insert them or, using an existing block of code, you can surround that block of code with a code snippet. Let s look at the first way. At any point in your source code you can right-click and select Insert Snippet and then select the code snippet that best fits the context. The second way needs a bit more explanation. Let s say you have an existing block of code that reads a line of text in a file and then parses some data. In the process of developing your application you realize that you need the code to read the whole file and not only one line. This means you need to add a looping construct. With Surround With it s quite easy to add the block of code to do the looping. You just have to select the block of code you want to loop, right-click, and select Surround With Then you need to select the instruction you want to surround your block of code with. In our example, you would surround the code with a while statement. Then you just have to double-click on the while statement and your code will be automatically embedded in the while block. Figure 5-8 shows a glimpse of the code snippets first-level menu choices. All code snippets are made with customizable fields, which means that they contain fields that are replaceable with code elements from your own applications. Going forward, you will be able to download additional code snippets from various sources such as Microsoft MSDN Web site, online communities, and other .NET vendors. You will also be able to add your own code snippets to the code snippets library to fulfill your needs in other projects.
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