class

问题 I have two classes, which are passed to Serialization method and I would like to access two properties of these classes in Serialization method. The problem is that Serialization method parameter are passed as generic type and I do not know how to access properties of passed class in this case. The example below. public class MyClass1 { public string MyProperty1 { get; set; } //These properties are shared in both classes public bool Result { get; set; } public string EngineErrorMessage { get;

问题 I know this question has already been ask, but I couldn't figure it out. I have two classes Point and Line, and 2 Points are members of Line. However in the Line constructor I get "no default constructor exists for the class" error. How can I fix this problem? #include <cstdlib> #include <cmath> #include "PointClass.h" using namespace std; class Line { public: Line(const Point& p1, const Point& p2) { this->point1 = p1; this->point2 = p2; } Point point1; Point point2; static double Distance

问题 I need my sprite to appear in the pygame window. How do I do this? Important code: #This will be a list that will contain all the sprites we intend to use in our game. all_sprites_list = pygame.sprite.Group() #creating the player player = player(BLUE, 60, 80, 70) player.rect.x = 200 player.rect.y = 300 At the end of the code I have pygame.display.update() . My sprite class (correctly imported): class player(pygame.sprite.Sprite): def __init__(self, color, width, height, speed): # Call the

问题 I am trying to create a PowerShell [DataTable] class derived from the standard [Data.DataTable] class to ease the creation of data tables: (see also: #11987 Accelerated [DataTable] with easy constructor and AddRow method) class DataTable : Data.DataTable { [ValidateNotNullOrEmpty()][Data.DataTable]$DataTable DataTable([Array]$ColumnNames) { $This.DataTable = New-Object Data.DataTable ForEach ($ColumnName in $ColumnNames) { If ($ColumnName -is [System.Collections.IDictionary]) { ForEach($Key

问题 I am trying to create a PowerShell [DataTable] class derived from the standard [Data.DataTable] class to ease the creation of data tables: (see also: #11987 Accelerated [DataTable] with easy constructor and AddRow method) class DataTable : Data.DataTable { [ValidateNotNullOrEmpty()][Data.DataTable]$DataTable DataTable([Array]$ColumnNames) { $This.DataTable = New-Object Data.DataTable ForEach ($ColumnName in $ColumnNames) { If ($ColumnName -is [System.Collections.IDictionary]) { ForEach($Key

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 8 years ago . I have two classes that need to extend one class. I am getting a compiler error since this cannot happen in Java. I know that you can implement as many interfaces you want to in Java but can only extend one other

问题 I'm new to HTML / CSS coding and since I first bumped into the ID and class selector, one question has been running through my mind. I searched the web thoroughly over and over again, but I coudln't find the answer I was looking for. The question is : Why use ID when you can do the same task with class ? I mean, ok I know that ID's are just for one time use and classes are for many, but what forbids me from using the class selector for just once ? So, according to this, what is the purpose of

问题 I'm new to HTML / CSS coding and since I first bumped into the ID and class selector, one question has been running through my mind. I searched the web thoroughly over and over again, but I coudln't find the answer I was looking for. The question is : Why use ID when you can do the same task with class ? I mean, ok I know that ID's are just for one time use and classes are for many, but what forbids me from using the class selector for just once ? So, according to this, what is the purpose of

问题 i have a problem to use delphi class from C++ code. delphi dll demo that export a function that return an object. my delphi Dll code is as follow: library DelphiTest; // uses part.... type IMyObject = interface procedure DoThis( n: Integer ); function DoThat : PWideChar; end; TMyObject = class(TInterfacedObject,IMyObject) procedure DoThis( n: Integer ); function DoThat: PChar; end; // TMyObject implementation go here ... procedure TMyObject.DoThis( n: Integer ); begin showmessage('you are

问题 If I disassemble my class file, I get LineNumberTables of the form LineNumberTable: line 204: 0 line 205: 9 line 208: 57 line 209: 63 line 210: 72 line 211: 75 line 212: 78 line 213: 87 line 216: 90 line 218: 118 line 221: 126 line 222: 131 line 223: 138 line 224: 143 line 227: 150 line 230: 157 line 231: 160 line 232: 170 line 235: 194 line 237: 228 line 240: 249 line 241: 259 line 243: 266 line 245: 269 line 246: 292 line 248: 295 line 249: 301 line 250: 308 line 251: 315 line 252: 322 line