只读字段语法快捷方式
正如我们所知，代码：
using(myDisposable)
{
}
等价于
try
{
//do something with myDisposable
}
finally
{
IDisposable disposable = myDisposable as IDisposable;
if(disposable != null)
{
disposable.Dispose();
}
}
和
lock(_locker)
{
}
等价于
Monitor.Enter(_locker);
try
{
}
finally
{
Monitor.Exit(_locker);
}
readonly 字段等价于什么？
readonly object _data = new object();
As we know the code:
using(myDisposable)
{
}
is equivalent of
try
{
//do something with myDisposable
}
finally
{
IDisposable disposable = myDisposable as IDisposable;
if(disposable != null)
{
disposable.Dispose();
}
}
and
lock(_locker)
{
}
is equivalent of
Monitor.Enter(_locker);
try
{
}
finally
{
Monitor.Exit(_locker);
}
What is the equivalent of readonly field?
readonly object _data = new object();
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评论（2）
只读对象相当于没有
readonly的初始化。主要区别在于 IL 元数据将在该字段上设置 initonly 位。挑剔：您对
using和lock的扩展在一些微妙的方面都是不正确的。lock版本不正确，因为它的扩展取决于您使用的 CLR 和 C# 编译器的版本。 C# 4.0 编译器与 4.0 运行时相结合，使用Enter(object, ref bool)模式，而不是普通的Enter(object)using版本有点不正确，因为它在finally块中看起来更接近于此A readonly object is equivalent to the intialization without
readonly. The main difference is that the IL metadat will have the initonly bit set on the field.Nitpick: Both your expansion of
usingandlockare incorrect in subtle ways.The
lockversion is incorrect because it's expansion depends on the version of the CLR and C# compiler you are using. The C# 4.0 compiler combined with the 4.0 runtime uses theEnter(object, ref bool)pattern instead of plainEnter(object)The
usingversion is subtly incorrect because it looks a bit closer to this in the finally block没有一个；也就是说，除非使用
readonly关键字，否则您无法表达readonly字段。readonly 关键字向编译器发出信号，表明该字段只能在类的构造函数内修改。
There isn't one; that is, you can't express a
readonlyfield except with thereadonlykeyword.The
readonlykeyword is a signal to the compiler that the field may only be modified inside the class's constructor.