c# – .NET中用户创建的结构和框架结构之间的差异

栏目: ASP.NET · 发布时间: 7年前

内容简介:翻译自:https://stackoverflow.com/questions/4268452/differences-between-user-created-structs-and-framework-structs-in-net

为什么C#编译器不允许你编译它:

int a;
Console.WriteLine(a);

但是允许你编译:

MyStruct a;
Console.WriteLine(a);

其中MyStruct定义为:

struct MyStruct
{

}

更新:在第一个案例中错误是:

Error 1 Use of unassigned local  variable ‘a’
C#不允许从未初始化的本地人那里阅读.以下是适用于此背景的 language specification

摘录:

5.3 Definite assignment

…

A struct-type variable is considered

definitely assigned

if each of its

instance variables is considered

definitely assigned.

显然,由于你的结构没有字段,这不是问题;它被认为是明确分配的.向其添加字段应该会破坏构建.

在一个有点相关的说明:

11.3.8 Constructors
No instance member function can be called until all fields  of the struct being constructed have  been definitely assigned.

翻译自:https://stackoverflow.com/questions/4268452/differences-between-user-created-structs-and-framework-structs-in-net


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