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小編給大家分享一下c#類成員初始化順序是什么,希望大家閱讀完這篇文章后大所收獲,下面讓我們一起去探討方法吧!
這里直接給出C#類成員一般初始化順序:
為什么說是“一般”初始化順序呢?因?yàn)楦鶕?jù)類結(jié)構(gòu)的不同,類成員的初始化順序并不是一成不變的。但是這個(gè)順序是基礎(chǔ),可以推導(dǎo)出其他特殊的初始化順序。下面我們就來看兩種特殊的情況:
static void Main(string[] args)
{
  Console.WriteLine("---------------一般初始化順序---------------");
  var child1 = new Child1();
  Console.WriteLine("\n---------------子類靜態(tài)字段初始化需要使用父類靜態(tài)字段時(shí)初始化順序---------------");
  var child2 = new Child2();
  Console.WriteLine("\n---------------子類靜態(tài)構(gòu)造函數(shù)中使用父類靜態(tài)字段時(shí)初始化順序---------------");
  var child3 = new Child3();
  Console.ReadKey();
}
public class Child1 : Base1
{
  public static Display ChildStatic = new Display("Child static filed");
  private Display _childFiled = new Display("Child filed");
  static Child1() => Console.WriteLine("Child static ctor");
  public Child1() => Console.WriteLine("Child ctor");
}
public class Child2 : Base2
{
  /// <summary>
  /// 子類靜態(tài)字段初始化需要使用父類靜態(tài)字段
  /// </summary>
  public static Display ChildStatic = new Display("Child static filed", () => BaseStatic);
  private Display _childFiled = new Display("Child filed");
  static Child2() => Console.WriteLine("Child static ctor");
  public Child2() => Console.WriteLine("Child ctor");
}
public class Child3 : Base3
{
  public static Display ChildStatic = new Display("Child static filed");
  private Display _childFiled = new Display("Child filed");
  /// <summary>
  /// 子類靜態(tài)構(gòu)造函數(shù)中使用父類靜態(tài)字段
  /// </summary>
  static Child3()
  {
    Console.WriteLine("Child static ctor");
    var baseStatic = BaseStatic;
  }
  public Child3() => Console.WriteLine("Child ctor");
}
/// <summary>
/// 3個(gè)Base類相同,這里是為了演示靜態(tài)成員的初始化
/// </summary>
public class Base1
{
  public static Display BaseStatic = new Display("Base static filed");
  private Display _baseFiled = new Display("Base filed");
  static Base1() => Console.WriteLine("Base static ctor");
  public Base1() => Console.WriteLine("Base ctor");
}
public class Base2
{
  public static Display BaseStatic = new Display("Base static filed");
  private Display _baseFiled = new Display("Base filed");
  static Base2() => Console.WriteLine("Base static ctor");
  public Base2() => Console.WriteLine("Base ctor");
}
public class Base3
{
  public static Display BaseStatic = new Display("Base static filed");
  private Display _baseFiled = new Display("Base filed");
  static Base3() => Console.WriteLine("Base static ctor");
  public Base3() => Console.WriteLine("Base ctor");
}
public class Display
{
  public Display(string msg, Func<Display> displayFunc = null)
  {
    Console.WriteLine(msg);
    var display = displayFunc?.Invoke();
  }
}            
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