In such cases, you should consider breaking the single long statement into several lines. The underscore must be immediately preceded by a space and immediately followed by a line terminator carriage return. In some cases, if you omit the line-continuation character, the Visual Basic compiler will implicitly continue the statement on the next line of code.
For a list of syntax elements for which you can omit the line-continuation character, see "Implicit Line Continuation" in Statements. In the following example, the statement is broken into four lines with line-continuation characters terminating all but the last line. The line-continuation character must be the last character on a line.
You can't follow it with anything else on the same line.
Some limitations exist as to where you can use the line-continuation character; for example, you can't use it in the middle of an argument name. You can break an argument list with the line-continuation character, but the individual names of the arguments must remain intact. Per gli utenti con problemi di ipovisione o carenze di colore, possiamo aumentare il contrasto fino a 7: Puoi utilizzare l' estensione Accessibility DevTools per Chrome per identificare i rapporti di contrasto.
Ci sono circa milioni di utenti con deficit di visione dei colori. Quando ci affidiamo al colore per trasmettere informazioni, facciamo aumentare quella cifra fino a raggiungere livelli inaccettabili.
La checklist WebAIM afferma nella sezione 1. Quando crei un'app, tieni a mente questo tipo di cose e fai attenzione alle aree in cui potresti affidarti troppo al colore per trasmettere informazioni importanti.
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Ci sono alcuni modi per ottenere una configurazione ad alto contrasto sul tuo computer. Oppure gli utenti possono installare un'estensione, come l'estensione Chrome ad alto contrasto per abilitare il contrasto elevato solo in quella specifica app. Allo stesso modo, considerando l'esempio della lezione precedente, la sottolineatura rossa nel campo del numero di telefono non valido potrebbe essere visualizzata in un colore blu-verde difficile da distinguere.
For details, see our Site Policies. Ultimo aggiornamento: Gennaio 29, Missed the action at the Chrome Dev Summit? Watch now. Starting with C 7. Discards are equivalent to unassigned variables; they do not have a value. Because there is only a single discard variable, and that variable may not even be allocated storage, discards can reduce memory allocations. Because they make the intent of your code clear, they enhance its readability and maintainability.
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For example, the following method call returns a 3-tuple in which the first and second values are discards and area is a previously declared variable to be set to the corresponding third component returned by GetCityInformation:. If it were an actual variable, you could not discard more than one value, as the previous example did. Discards are particularly useful in working with tuples when your application code uses some tuple elements but ignores others.
For example, the following QueryCityDataForYears method returns a 6-tuple with the name of a city, its area, a year, the city's population for that year, a second year, and the city's population for that second year. The example shows the change in population between those two years.
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Of the data available from the tuple, we're unconcerned with the city area, and we know the city name and the two dates at design-time. As a result, we're only interested in the two population values stored in the tuple, and can handle its remaining values as discards. For more information on deconstructing tuples with discards, see Deconstructing tuples and other types. The Deconstruct method of a class, structure, or interface also allows you to retrieve and deconstruct a specific set of data from an object.
You can use discards when you are interested in working with only a subset of the deconstructed values. The following example deconstructs a Person object into four strings the first and last names, the city, and the state , but discards the last name and the state.
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For more information on deconstructing user-defined types with discards, see Deconstructing tuples and other types. The discard pattern can be used in pattern matching with the is and switch keywords. Every expression always matches the discard pattern.
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