基礎知識

容易忘記的知識

1.region…endregion區域

摺疊程式碼的功能

#region 測試
string[] languages = { "Java", "C#", "C++", "Delphi", "VB.net", "VC.net", "C++Builder", "Kylix", "Perl", "Python" };
var query = from item in languages
            group item by item.Length into lengthGroups
            orderby lengthGroups.Key
            select lengthGroups;
foreach (var item in query)
{
    Console.WriteLine("strings of length{0}", item.Key);
    foreach (var val in item)
    {
        Console.WriteLine(val);
    }
}
Console.ReadKey();
#endregion

2.佔位符

int a = 10;
double n2 = 3.0;
Console.WriteLine("佔位符{0}", a);  
Console.WriteLine("{0:0.00}", a / n2); //3.33
Console.ReadKey();