Question

在下面的示例中，有没有一种方法可以将空值引用类型转换为非空值引用类型？

这是针对启用编译器的可空引用标志的情况。

当可为空的引用类型为null时，我希望它引发异常。

    Assembly? EntryAssemblyNullable = Assembly.GetEntryAssembly();

    if (EntryAssemblyNullable is null)
    {
        throw new Exception("The CLR method of Assembly.GetEntryAssembly() returned null");
    }

    Assembly EntryAssembly = EntryAssemblyNullable;
    var LocationNullable = Path.GetDirectoryName(EntryAssembly.Location);
    if (LocationNullable is null)
    {
        throw new Exception("The CLR method of Assembly.GetEntryAssembly().Location returned null");
    }

    string ExecutableLocationPath = LocationNullable;

Answer 1

您可以将throw expressions与null coalescing operator一起使用。

Assembly EntryAssembly = Assembly.GetEntryAssembly() ?? throw new Exception("The CLR method of Assembly.GetEntryAssembly() returned null");

将空值引用类型转换为非空值引用类型

1 个答案: