Unity \"Feature 'out variable declaration' cannot be used because it is not part of the C# 4.0\"

Unity2017升级到2019后，脚本全都不可用，报错后半段部分内容为“Feature `out variable declaration' cannot be used because it is not part of the C# 4.0 language specification”。

在Unity选择【Edit】――【Project Settings】――【Player】――【Other Settings】――【Configuration】大项下的【Scripting Runtime Version】选项选择【.NET 4.x Equivalent】即可解决问题。

来源：博客园

作者：xiaofei01gm

链接：https://www.cnblogs.com/yxfcnbg/p/11433530.html