本文介绍了确定泛型参数是否为 Nullable 类型的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有以下VB.NET函数，例如:
I have the following VB.NET function, for example:
Public Function MyFunction (Of TData) (ByVal InParam As Integer) As TData
End Sub
如何在函数中确定 TData 是否为 NULLable 类型?
How do I, in a function, determine if TData is a NULLable Type?
推荐答案
一种方法是:
If Nullable.GetUnderlyingType(GetType(TData)) <> Nothing
...至少，C# 是:
... at least, the C# is:
if (Nullable.GetUnderlyingType(typeof(TData)) != null)
假设您在询问它是否为可空值类型.如果您问它是可空值类型还是类，那么 C# 版本将是:
That's assuming you're asking whether it's a nullable value type. If you're asking whether it's a nullable value type or a class then the C# version would be:
if (default(TData) == null)
但我不确定简单的 VB 翻译是否适用于那里，因为Nothing"在 VB 中略有不同.
but I'm not sure whether a simple VB translation would work there, as "Nothing" is slightly different in VB.
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