本文整理匯總了C#中System.Double.TryParse方法的典型用法代碼示例。如果您正苦於以下問題：C# Double.TryParse方法的具體用法？C# Double.TryParse怎麽用？C# Double.TryParse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.Double的用法示例。
在下文中一共展示了Double.TryParse方法的3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;
public class Example
{
public static void Main()
{
string[] values = { "1,643.57", "$1,643.57", "-1.643e6",
"-168934617882109132", "123AE6",
null, String.Empty, "ABCDEF" };
double number;
foreach (var value in values) {
if (Double.TryParse(value, out number))
Console.WriteLine("'{0}' --> {1}", value, number);
else
Console.WriteLine("Unable to parse '{0}'.", value);
}
}
}輸出：
'1,643.57' --> 1643.57 Unable to parse '$1,643.57'. '-1.643e6' --> -1643000 '-168934617882109132' --> -1.68934617882109E+17 Unable to parse '123AE6'. Unable to parse ''. Unable to parse ''. Unable to parse 'ABCDEF'.
示例2: Main
//引入命名空間
using System;
public class Example
{
public static void Main()
{
string value;
double number;
value = Double.MinValue.ToString();
if (Double.TryParse(value, out number))
Console.WriteLine(number);
else
Console.WriteLine("{0} is outside the range of a Double.",
value);
value = Double.MaxValue.ToString();
if (Double.TryParse(value, out number))
Console.WriteLine(number);
else
Console.WriteLine("{0} is outside the range of a Double.",
value);
}
}輸出：
-1.79769313486232E+308 is outside the range of the Double type. 1.79769313486232E+308 is outside the range of the Double type.
示例3: if
string value;
NumberStyles style;
CultureInfo culture;
double number;
// Parse currency value using en-GB culture.
value = "£1,097.63";
style = NumberStyles.Number | NumberStyles.AllowCurrencySymbol;
culture = CultureInfo.CreateSpecificCulture("en-GB");
if (Double.TryParse(value, style, culture, out number))
Console.WriteLine("Converted '{0}' to {1}.", value, number);
else
Console.WriteLine("Unable to convert '{0}'.", value);
// Displays:
// Converted '£1,097.63' to 1097.63.
value = "1345,978";
style = NumberStyles.AllowDecimalPoint;
culture = CultureInfo.CreateSpecificCulture("fr-FR");
if (Double.TryParse(value, style, culture, out number))
Console.WriteLine("Converted '{0}' to {1}.", value, number);
else
Console.WriteLine("Unable to convert '{0}'.", value);
// Displays:
// Converted '1345,978' to 1345.978.
value = "1.345,978";
style = NumberStyles.AllowDecimalPoint | NumberStyles.AllowThousands;
culture = CultureInfo.CreateSpecificCulture("es-ES");
if (Double.TryParse(value, style, culture, out number))
Console.WriteLine("Converted '{0}' to {1}.", value, number);
else
Console.WriteLine("Unable to convert '{0}'.", value);
// Displays:
// Converted '1.345,978' to 1345.978.
value = "1 345,978";
if (Double.TryParse(value, style, culture, out number))
Console.WriteLine("Converted '{0}' to {1}.", value, number);
else
Console.WriteLine("Unable to convert '{0}'.", value);
// Displays:
// Unable to convert '1 345,978'.