在 C# 中的实例化期间将参数传递到大括号中的 object

Question

When you pass an variable into an object during instantiation, such as in

SomeObject newObject = new SomeObject() { SomeString = "String goes here" };

Will the variable SomeString be accessible in the constructor or will it be assigned afterwards? If I needed to use it in the constructor, would it work or would I need to pass it through as a parameter using

new SomeObject("String goes here");

Answer 1

will the variable SomeString be accessible in the constructor, or will it be assigned afterwards?

It will be assigned afterwards.

SomeObject newObject = new SomeObject() { SomeString = "String goes here" };

is roughly equivalent/syntactic sugar to:

SomeObject temp = new SomeObject();
temp.SomeString = "String goes here";
SomeObject newObject = temp;

Answer 2

It will be assigned afterwards in the first case. NOTE: This requires there to be a parameterless constructor , which will exist by default, unless you define a parameterized constructor. In that case you must define both constructors explicitly.

For more detail you can look at details on Object Initializers .