c# net qr code generator Or to take arms against a sea of troubles, And by opposing end them. in C#.NET

Printer QR Code in C#.NET Or to take arms against a sea of troubles, And by opposing end them.

Or to take arms against a sea of troubles, And by opposing end them.
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The debug output indicates that the code found and removed eight blank lines. (If you can t see the Output panel in Visual Studio, you can show it with the View Output menu item. Ensure that the Show output from drop down has Debug selected.) But apparently it missed some, judging by the output. So which are the eight blank lines that is, the lines that are the equivalent of String.Empty If you single-step through the debugger, you ll see that they are the ones that look like "" and String.Empty. The ones that contain just whitespace account for some of the remaining blanks in the output. While visibly blank, these are clearly not empty they contain whitespace characters. We ll deal with that in a minute. The other line that looks empty but isn t is the null string. As we said earlier, strings are reference types. There is, therefore, a considerable difference between a null reference to a string, and an empty string, as far as the .NET runtime is concerned. However, a lot of applications don t care about this distinction, so it can sometimes be useful to treat a null string in much the same way as an empty string. The String class offers a static method that lets us test for nullness-or-emptiness with a single call, which Example 10-76 uses.
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foreach (string line in strings) { if (!String.IsNullOrEmpty(line)) { output.AppendLine(line); } else { System.Diagnostics.Debug.WriteLine("Found a blank line"); } }
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Notice we have to use the ! operator, as the static method returns true if the string is null or empty. Our output is now stripped of blank lines except the one that contains just whitespace. If you check the debug output panel, you ll see that nine lines have been ignored:
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To be, or not to be--that is the question: Whether 'tis nobelr in the mind to suffer, The slings and arrows of outrageous fortune , Or to take arms against a sea of troubles, And by opposing end them.
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So, what can we do about that remaining blank line at the start We can deal with this by stripping out spurious whitespace, and then looking to see whether anything is left.
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Not only will this fix our blank-line problem, but it will also remove any whitespace that the user has left at the start and end of the line.
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Trimming Whitespace
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You often (but not always) want to trim whitespace from the beginning and/or end of a piece of text; especially user-provided text. When storing data in a SQL database, for example, it is frequently desirable to trim this whitespace. With that in mind, the framework provides us with the Trim, TrimStart, and TrimEnd methods. Example 10-77 uses Trim to remove the whitespace at the start and end of every line.
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foreach (string line in strings) { if (line != null) { string trimmedLine = line.Trim(); if (trimmedLine.Length != 0) { output.AppendLine(trimmedLine); } else { System.Diagnostics.Debug.WriteLine( "Found a blank line (after trimming)"); } } else { System.Diagnostics.Debug.WriteLine("Found a null line"); } }
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Notice how we re trimming the line once, and storing a reference to the result in a variable, then using that trimmed string in our subsequent tests. Because we re calling a method on our string instance, we need to test it for nullness before we do that, or we ll get a null reference exception. This means that we don t need to call IsNullOr Empty in our later test. We know that it cannot be null. Instead, we do a quick test for emptiness. It turns out that the most efficient way to do this is not to compare against String.Empty but to check the Length of our string. If we build and run this, we see the following output:
To be, or not to be--that is the question: Whether 'tis nobler in the mind to suffer, The slings and arrows of outrageous fortune , Or to take arms against a sea of troubles, And by opposing end them.
And in the output window:
Found Found Found Found Found Found Found Found Found a a a a a a a a a blank line null line blank line blank line blank line blank line blank line blank line blank line (after trimming) (after (after (after (after (after (after (after trimming) trimming) trimming) trimming) trimming) trimming) trimming)
You ll notice that Trim has successfully removed all the whitespace at the beginning and end of each line, both spaces and tab characters, but left the whitespace in the middle of the line alone.
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