在选择之外使用声明的变量（IF） [英] Using Declared Variable Outside A Selection (IF)

问题描述

嗨


基本上我有一个if循环选择，并且我已经在其中定义了一个变量，但是在其他地方我也希望使用它，但我不能有人有请给我任何建议。

Hi
Basically i have a if loop selection, and i have defined a variable in it, however in the else i wish to use it aswell, but i cant does anyone have any suggestions how i can do this please.

if (Selection)
{
String Name = "Hello";
}
Else
{
Name;
}

以上就是我想要发生的事情，不要让我使用变量Name建议请。

Above is what i wish to happen something like that bu it wont let me use the variable "Name" any suggestions please.

推荐答案

String Name = string.Empty;

if (Selection)
{
Name = "Hello";
}
Else
{
Name = "Another value";
}

只需在if块之外声明你的varable。

Just declare your varable outside of if block.

String Name;
if (Selection)
{
Name = "Hello";
}
else
{
Name="Something else";
}

唯一的问题是定义的位置：你的名称的声明是只能在其区块范围内访问。如果您不使用大括号，即使声明也会导致编译错误。分辨率看起来像

The only problem is the locality of definition: your declaration of Name is accessible only in its block's scope. If you didn't use curly brackets, even the declaration would cause compilation error. The resolution would look like

string name = null; // or something else, but some initialization is absolutely required
if (Selection)
   name = "Hello";
else
   name = "something else";

在进一步移动之前，您需要阅读地点和范围主题。几乎任何C＃手册都包括这个主题。



祝你好运，

-SA

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