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C#

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namespace DS.Module.Nuget
{
public class Class1
{
public void test()
{
int? x = null;
//// 使用传统的 if 语句来检查值是否为 null
//if (x == null) {
// // ...
//}
//// 使用模式匹配来检查值是否为 null
//private match(x)
// {
// null =>1 // ...
// value => // ...
// }
// 使用传统的 if 语句来检查值是否为 null
//int? x = null;
//if (x != null)
//{
// // ...
//}
//// 使用 null 传播来检查值是否为 null
//int y = x ?? 0; // 如果 x 为 null则 y 将为 0
}
}
}