我有下一个代码:
struct T
{
public T(int u)
{
this.U = 10; //Errors are here
}
public int U { get; private set; }
}
C# 编译器在声明的行中给我一对错误: 1) 自动实现的属性“TestConsoleApp.Program.T.U”的支持字段必须在控制返回给调用者之前完全分配。考虑从构造函数初始值设定项调用默认构造函数。 2) 'this' 对象在其所有字段都分配给之前不能使用
我做错了什么?帮助我理解。
最佳答案
来自 C# 规范:
10.7.3 Automatically implemented properties
When a property is specified as an automatically implemented property, a hidden backing field is automatically available for the property, and the accessors are implemented to read from and write to that backing field.
[Deleted]
Because the backing field is inaccessible, it can be read and written only through the property accessors, even within the containing type.
[Deleted]
This restriction also means that definite assignment of struct types with auto-implemented properties can only be achieved using the standard constructor of the struct, since assigning to the property itself requires the struct to be definitely assigned. This means that user-defined constructors must call the default constructor.
所以你需要这个:
struct T
{
public T(int u)
: this()
{
this.U = u;
}
public int U { get; private set; }
}
关于c# - 无法分配结构中自动实现的属性,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7670780/