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RSS订阅原创 Nullable Operators (C#)
Null-Coalescing Operator (??) It is a shorthand to check if the variable is null before accessing its value.int? i = null;string? temp="I'm not null!";int index = i ?? 0;string result = temp ?? "Null";Console.WriteLine(index);Console.WriteLin..
2022-05-03 18:07:55
107
原创 Nullable Types (?) (C#)
Nullable Value Type The ? suffix is a shorthand for creating an instance of the generic System.Nullable<T> structure.static void NullableItems(){ int? item1 = 0; // Nullable<int> item1 = 0; bool? item2 = null; // Nullabl..
2022-05-03 17:49:41
272
原创 Value Types and Reference Types (C#)
C# structs are derived from System.ValueType which overrides the virtual methods in System.Object to use value-based semanitcs instead of reference-based ones.System.ValueType is allocated on stack rather than on garbage-collected heap. Its lifetime is i
2022-05-03 16:33:42
104
原创 enum (C#)
Default storage type of enum is System.Int32.The storage type could be changed to byte, short, int and long,var vehicle1 = VehiclesTypeEnum.MiniVan;Console.WriteLine($"The result is " + $"{Enum.GetUnderlyingType(vehicle1.GetType())}");Console.W
2022-05-03 14:59:35
214
原创 Method Parameter Modifiers (C#)
Modifier Remarks (None) value type: passed by value (a copy of data) reference type: passed by reference out out parameters are passed by reference. Must be assigned in the method. in to indicates that the ref parameters are r
2022-05-03 10:03:16
154
原创 switch (C#)
switch on an enumeration data type; static void SwitchOnEnum() { Console.WriteLine("Enter your favorite day of the week: "); DayOfWeek day; try { day=(DayOfWeek) Enum.Parse(t.
2022-05-02 17:36:17
775
原创 Conditional Operator (?:) (C#)
condition ? expression1 : expression2;When condition is true, expression1 is executed.Experssion2 is executed when false.It is used only in assignment statement.Expression1 and experssion2 must have implicit conversions from one to another.It can .
2022-05-02 16:06:48
424
原创 Pattern Matching (C#)
if/else Pattern Matching (C# 7.0)Use "is" keyword to check the type of an objectExample： static void FindPattern() { object item1 = 10; object item2 = "Hello!"; if(item1 is int value1) {
2022-05-02 15:37:34
291
原创 3DEXPERIENCE：如何获取Service Object （C#）
1）用Application.GetSessionService获取Service ObjectUse the GetSessionService method of the Application object to return a session-level Service object.VisuServices oVisuService= CATIA.GetSessionService("VisuServices")The table below lists the service i
2022-03-24 17:13:53
239
2
原创 WPF and XAML
1. Definitions of WPF and XAML2. Defference between WPF and Windows Form
2021-06-26 09:26:59
87
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