如何将参数传递给 static class 构造函数？

Question

我有一个带有静态构造函数的静态 class。我需要以某种方式将参数传递给此静态 class 但我不确定最好的方法是什么。你会推荐什么？

public static class MyClass {

    static MyClass() {
        DoStuff("HardCodedParameter")
    }
}

Answer 1

不要使用静态构造函数，而是使用静态初始化方法：

public class A
{
    private static string ParamA { get; set; }

    public static void Init(string paramA)
    {
        ParamA = paramA;
    }
}

在 C# 中，静态构造函数是无参数的，并且很少有方法可以克服此限制。一个是我上面给你的建议。

Answer 2

根据 MSDN，A static constructor is called automatically to initialize the class before the first instance is created。因此您不能发送任何参数。

CLR 必须调用静态构造函数，它如何知道要传递哪些参数？

所以不要使用静态构造函数。

这是满足您要求的解决方法。

public class StaticClass 
{ 
  private int bar; 
  private static StaticClass _foo;

  private StaticClass() {}

  static StaticClass Create(int initialBar) 
  { 
    _foo = new StaticClass();
    _foo.bar = initialBar; 
    return _foo;
  } 
}

Static constructors have the following properties:

A static constructor does not take access modifiers or have parameters. A static constructor is called automatically to initialize the class before the first instance is created or any static members are referenced.

A static constructor cannot be called directly.

The user has no control on when the static constructor is executed in the program.

A typical use of static constructors is when the class is using a log file and the constructor is used to write entries to this file.

Static constructors are also useful when creating wrapper classes for unmanaged code, when the constructor can call the LoadLibrary method.

If a static constructor throws an exception, the runtime will not invoke it a second time, and the type will remain uninitialized for the lifetime of the application domain in which your program is running.

Answer 3

如果 "HardCodedParameter" 你的意思是硬编码，你可以使用常量。

public static class YoursClass
{ 
    public const string AnotherHardCodedParam = "Foo";
}

public static class MyClass
{
    private const string HardCodedParam = "FooBar";

    static MyClass()
    {
        DoStuff(MyClass.HardCodedParam);
        DoStuff(YoursClass.AnotherHardCodedParam);
    }
}

此外，您可以使用静态只读属性。

Answer 4

非静态 class 上的构造函数有利于确保在实际使用之前正确初始化它们。

因为静态 classes 没有这个好处，你必须确保自己。

使用名称明显的静态构造函数，然后在静态过程的相关部分检查以确保已执行初始化。下面的示例假设您想要使用 Form 对象“初始化”静态 class。

    public static class MyClass
    {
        private static Form FormMain { get; set; }

        public static void Init(Form initForm)
        {
            FormMain = initForm;
        }

        private static bool InitCheck()
        {
            return FormMain != null ? true: false;
        }

        public static void DoStuff()
        {
            if (InitCheck())
            {
                // Do your things
            }
            else
            {
                throw new Exception("Object reference not set to an instance of an object");
            }
        }
    }

如何将参数传递给 static class 构造函数？

How to pass parameter to static class constructor?

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