readonly field can be initialized either at the declaration or in a constructor.‘ data-guid="257637d5ffda9953f70ee09ecc32366c">readonly 字段可以在声明或构造函数中初始化。

class Age

{
readonly int age;
public Age()
{
age = 10;
}
public void ChangeAge()
{
//age = 100;//尝试修改age的值，错误
}
}

以下是可以进行的[集合类型不同于普通变量]

class ChuckReadOnly<TKey,TValue>
{
private readonly Dictionary<TKey, TValue> dictinonary = new Dictionary<TKey, TValue>();
public void DoTask(TKey key,TValue value)
{
dictinonary.Add(key,value);
}

}

readony主要是监控"="赋值运算的