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Architect_Programmer_Code Agriculture Network»Architect › Programming › .Net/C # › C# 7.3 upgrades to 8.0 use the Using declaration
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[Source] C# 7.3 upgrades to 8.0 use the Using declaration

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Posted on 3/28/2020 6:30:09 PM | | | |
Functional Using states "Not available in C# 7.3. Please use 8.0 or higher language,


.NET 4.0 project, I want to use the latest 8.0 syntax, find VS2019 error, the solution is as follows.

Solution 1:

Uninstall the project and edit the project file. You can set the language version in the project file. For example, if you explicitly want to access the preview feature, add elements like this:

Solution 2:

Clearly declare the version, or uninstall the project and edit the .csproj file

or






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