将C#6.0默认属性值转换为C#5.0

Question

public List<string> MembershipIds
{
    get;
    set;
} = new List<string>();

我得到了无效令牌

类,结构或接口成员声明中的"=".

这是C#6功能.如何将其转换为C#5？

Answer 1

在保留自动财产的同时,没有简单的方法可以做到这一点.

如果您不需要自动属性,请将代码转换为使用私有变量和非自动属性:

private List<string> membershipIds = new List<string>();
public List<string> MembershipIds {
    get { return membershipIds; }
    set { membershipIds = value; }
}

如果确实需要auto-property,则需要在构造函数中进行赋值:

public List<string> MembershipIds { get;set; }
...
// This constructor will do the assignment.
// If you do not plan to publish no-argument constructor,
// it's OK to make it private.
public MyClass() {
    MembershipIds = new List<string>();
}
// All other constructors will call the no-arg constructor
public MyClass(int arg) : this() {// Call the no-arg constructor
    .. // do other things
}
public MyClass(string arg) : this() {// Call the no-arg constructor
    .. // do other things
}