如何初始化变种？ [英] How to initialize var?

问题描述

我可以初始化VAR与null或一些空值？

Can I initialize var with null or some empty value?

推荐答案

C＃是一个严格/强类型语言即可。 VAR介绍了编译时类型结合的匿名类型但你可以使用VAR为原始和自定义这是在设计时已经知道的类型。在运行时，没有什么比变种，它是由一个实际的类型要么是引用类型或值类型替换。

C# is a strictly/strongly typed language. var was introduced for compile-time type-binding for anonymous types yet you can use var for primitive and custom types that are already known at design time. At runtime there's nothing like var, it is replaced by an actual type that is either a reference type or value type.

当你说：

var x = null; 

编译器无法解决此监守没有绑定类型为null。你可以把它像这样。

the compiler cannot resolve this becuase there's no type bound to null. You can make it like this.

string y = null;
var x = y;

这会工作，因为现在x可以知道它在编译时是串在这种情​​况下类型。

This will work because now x can know its type at compile time that is string in this case.

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