本文整理匯總了C#中System.Nullable<T>.GetValueOrDefault方法的典型用法代碼示例。如果您正苦於以下問題：C# Nullable<T>.GetValueOrDefault方法的具體用法？C# Nullable<T>.GetValueOrDefault怎麽用？C# Nullable<T>.GetValueOrDefault使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Nullable<T>的用法示例。
在下文中一共展示了Nullable<T>.GetValueOrDefault方法的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
// This code example demonstrates the
// Nullable<T>.GetValueOrDefault methods.
using System;
class Sample
{
public static void Main()
{
float? mySingle = 12.34f;
float? yourSingle = -1.0f;
Console.WriteLine("*** Display a value or the default value ***\n");
// Display the values of mySingle and yourSingle.
Display("A1", mySingle, yourSingle);
// Assign the value of mySingle to yourSingle, then display the values
// of mySingle and yourSingle. The yourSingle variable is assigned the
// value 12.34 because mySingle has a value.
yourSingle = mySingle.GetValueOrDefault();
Display("A2", mySingle, yourSingle);
// Assign null (Nothing in Visual Basic) to mySingle, which means no value is
// defined for mySingle. Then assign the value of mySingle to yourSingle and
// display the values of both variables. The default value of all binary zeroes
// is assigned to yourSingle because mySingle has no value.
mySingle = null;
yourSingle = mySingle.GetValueOrDefault();
Display("A3", mySingle, yourSingle);
// Reassign the original values of mySingle and yourSingle.
mySingle = 12.34f;
yourSingle = -1.0f;
Console.Write("\n*** Display a value or the ");
Console.WriteLine("specified default value ***\n");
// Display the values of mySingle and yourSingle.
Display("B1", mySingle, yourSingle);
// Assign the value of mySingle to yourSingle, then display the values
// of mySingle and yourSingle. The yourSingle variable is assigned the
// value 12.34 because mySingle has a value.
yourSingle = mySingle.GetValueOrDefault(-222.22f);
Display("B2", mySingle, yourSingle);
// Assign null (Nothing in Visual Basic) to mySingle, which means no value is
// defined for mySingle. Then assign the value of mySingle to yourSingle and
// display the values of both variables. The specified default value of -333.33
// is assigned to yourSingle because mySingle has no value.
mySingle = null;
yourSingle = mySingle.GetValueOrDefault(-333.33f);
Display("B3", mySingle, yourSingle);
}
// Display the values of two nullable of System.Single structures.
// The Console.WriteLine method automatically calls the ToString methods of
// each input argument to display its values. If no value is defined for a
// nullable type, the ToString method for that argument returns the empty
// string ("").
public static void Display(string title, float? dspMySingle, float? dspYourSingle)
{
Console.WriteLine("{0}) mySingle = [{1}], yourSingle = [{2}]",
title, dspMySingle, dspYourSingle);
}
}輸出：
A1) mySingle = [12.34], yourSingle = [-1] A2) mySingle = [12.34], yourSingle = [12.34] A3) mySingle = [], yourSingle = [0] *** Display a value or the specified default value *** B1) mySingle = [12.34], yourSingle = [-1] B2) mySingle = [12.34], yourSingle = [12.34] B3) mySingle = [], yourSingle = [-333.33]