我该如何修复以下 nullreference？ 以及如何关闭 nullrefernce（来自<propertygroup> )?</propertygroup>

Question

public class BlockChain
{   
   public IList<Block>Chain{ get; set; }
}

Non-nullable property 'Chain' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Answer 1

Not sure what project you are writing but you could do:

1. add <Nullable>disable</Nullable> in.csproj file
2. add #nullable disable in class
3. set Chain as public IList<Block> Chain{ get; set; } = new NameOfClassThatImplementsInterface(); public IList<Block> Chain{ get; set; } = new NameOfClassThatImplementsInterface(); (recommended)
4. set Chain as public IList<Block>? Chain{ get; set; } public IList<Block>? Chain{ get; set; }