类型静态构造函数调用
可能的重复：
为什么 CLR 不总是调用值类型构造函数
在 Richter 的书中找到下一个代码（我对其进行了一些简化）：
internal struct SomeValType
{
static SomeValType()
{
Console.WriteLine("This never gets displayed");
}
public Int32 X;
}
public sealed class Program
{
public static void Main()
{
SomeValType a = new SomeValType { X = 123 };
Console.WriteLine(a.X);
}
}
输出：
123
无法理解为什么静态构造函数 nevel 调用中的 WriteLine。查看 ILDasm - 存在构造函数代码和方法调用。如果我向 SomeValType 添加任何静态变量并在构造函数中初始化它，则 WriteLine 可以正确调用。
有人可以解释一下这种情况下的行为吗？谢谢。
Possible Duplicate:
Why doesn't the CLR always call value type constructors
Found next code in Richter's book (I have simplified it a little bit):
internal struct SomeValType
{
static SomeValType()
{
Console.WriteLine("This never gets displayed");
}
public Int32 X;
}
public sealed class Program
{
public static void Main()
{
SomeValType a = new SomeValType { X = 123 };
Console.WriteLine(a.X);
}
}
Output:
123
Can't understand why WriteLine in static constructor nevel calls. Looked at ILDasm - constructor code and calling of method are present. If I add any static variable to SomeValType and init it in constructor then WriteLine calling correctly.
Can someone explain, please, behavior in such situation? Thanks.
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可能是因为您从未访问真实构造函数或静态字段。
值类型的默认构造函数很特殊。这只是对所有字段的默认值进行二进制初始化（即整个结构的二进制零）
Probably because you're never accessing a real constructor nor a static field.
The default constructor of value types is special. It's just an initialization to binary the default value of all fields(i.e. binary zero the whole struct)
来自MSDN：
自动初始化类 [强调我的]
在创建第一个实例之前
或引用任何静态成员。
看来“类”这个词是这里的关键。将 SomeValType 设为类会导致在创建该类型的第一个实例时调用静态构造函数，如上所述。然而，当它是一个结构时，似乎您需要访问静态字段或调用静态方法才能触发此行为。这是一个错误还是有意为之？
From MSDN:
automatically to initialize the class [emphasis mine]
before the first instance is created
or any static members are referenced.
It seems that the word class is the key here. Making SomeValType a class results in a static constructor invocation upon creating the first instance of the type as stated above. When it is a struct, however, it seems you need to access a static field or call a static method for this behavior to be triggered. Is this a bug or is it intended?