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  • /langversion 的选项“4”无效;必须是 ISO-1、ISO-2、3 或 Default SystemFrameWorkV3

    https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version

    Edit the csproj file

    You can set the language version in your .csproj file. Add an element like the following:

    XML
    <PropertyGroup>
       <LangVersion>latest</LangVersion>
    </PropertyGroup>
    

    The value latest uses the latest minor version of the C# language. Valid values are:

    ValueMeaning
    default The compiler accepts all valid language syntax from the latest major version that it can support.
    ISO-1 The compiler accepts only syntax that is included in ISO/IEC 23270:2003 C# (1.0/1.2)
    ISO-2 The compiler accepts only syntax that is included in ISO/IEC 23270:2006 C# (2.0)
    3 The compiler accepts only syntax that is included in C# 3.0 or lower.
    4 The compiler accepts only syntax that is included in C# 4.0 or lower.
    5 The compiler accepts only syntax that is included in C# 5.0 or lower.
    6 The compiler accepts only syntax that is included in C# 6.0 or lower.
    7 The compiler accepts only syntax that is included in C# 7.0 or lower.
    7.1 The compiler accepts only syntax that is included in C# 7.1 or lower.
    7.2 The compiler accepts only syntax that is included in C# 7.2 or lower.
    7.3 The compiler accepts only syntax that is included in C# 7.3 or lower.
    latest The compiler accepts all valid language syntax that it can support.

    The special strings default and latest resolve to the latest major (C# 7.0) and minor (C# 7.3) language versions installed on the build machine, respectively.

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  • 原文地址:https://www.cnblogs.com/rgqancy/p/9557387.html
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