本文整理匯總了C#中System.Nullable<T>結構體的典型用法代碼示例。如果您正苦於以下問題：C# Nullable<T>結構體的具體用法？C# Nullable<T>怎麽用？C# Nullable<T>使用的例子？那麽, 這裏精選的結構體代碼示例或許可以為您提供幫助。
Nullable<T>結構體屬於System命名空間，在下文中一共展示了Nullable<T>結構體的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C#代碼示例。
示例1: Main
//引入命名空間
using System;
class Sample
{
// Define the "titleAuthor" table of the Microsoft "pubs" database.
public struct titleAuthor
{
// Author ID; format ###-##-####
public string au_id;
// Title ID; format AA####
public string title_id;
// Author ORD is nullable.
public short? au_ord;
// Royalty Percent is nullable.
public int? royaltyper;
}
public static void Main()
{
// Declare and initialize the titleAuthor array.
titleAuthor[] ta = new titleAuthor[3];
ta[0].au_id = "712-32-1176";
ta[0].title_id = "PS3333";
ta[0].au_ord = 1;
ta[0].royaltyper = 100;
ta[1].au_id = "213-46-8915";
ta[1].title_id = "BU1032";
ta[1].au_ord = null;
ta[1].royaltyper = null;
ta[2].au_id = "672-71-3249";
ta[2].title_id = "TC7777";
ta[2].au_ord = null;
ta[2].royaltyper = 40;
// Display the values of the titleAuthor array elements, and
// display a legend.
Display("Title Authors Table", ta);
Console.WriteLine("Legend:");
Console.WriteLine("An Author ORD of -1 means no value is defined.");
Console.WriteLine("A Royalty % of 0 means no value is defined.");
}
// Display the values of the titleAuthor array elements.
public static void Display(string dspTitle,
titleAuthor[] dspAllTitleAuthors)
{
Console.WriteLine("*** {0} ***", dspTitle);
foreach (titleAuthor dspTA in dspAllTitleAuthors) {
Console.WriteLine("Author ID ... {0}", dspTA.au_id);
Console.WriteLine("Title ID .... {0}", dspTA.title_id);
Console.WriteLine("Author ORD .. {0}", dspTA.au_ord ?? -1);
Console.WriteLine("Royalty % ... {0}", dspTA.royaltyper ?? 0);
Console.WriteLine();
}
}
}輸出：
*** Title Authors Table *** Author ID ... 712-32-1176 Title ID .... PS3333 Author ORD .. 1 Royalty % ... 100 Author ID ... 213-46-8915 Title ID .... BU1032 Author ORD .. -1 Royalty % ... 0 Author ID ... 672-71-3249 Title ID .... TC7777 Author ORD .. -1 Royalty % ... 40 Legend: An Author ORD of -1 means no value is defined. A Royalty % of 0 means no value is defined.