声明一个 var 而不初始化它......只是还没有 [英] Declare a var without initializing it... just yet

问题描述

有没有办法或技巧来做这样的事情:

Is there a way or a trick to do something like:

var existingUsers; // This is not possible, but i need it to be global :)
try
{
    existingUsers = Repo.GetAll(); // This may crash, and needs to be in a try
}
catch (Exception)
{
    throw new Exception("some error, don't bother");
}

if (existingUsers.Count > 0)
    {
        //some code
    }

或者也许可以替代我正在尝试做的事情?

Or maybe an alternative for what I'm trying to do?

推荐答案

这里的正确答案是放弃使用 var 并正确指定 existingUsers 的类型try...catch 块之外:

The correct answer here is to drop the use of var and to correctly specify the type of existingUsers outside the try...catch block:

List<User> existingUsers = null; // or whatever is the right type!
try
{
    existingUsers = Repo.GetAll(); // This may crash, and needs to be in a try
}
catch (Exception)
{
    throw new Exception("some error, don't bother");
}
if (existingUsers.Count > 0)
{
    //some code
}

这篇关于声明一个 var 而不初始化它......只是还没有的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！