C# 如何检查 object 类型的变量是否可以转换为结构类型？

Question

In C#, if I have a variable of type object , how can I check if I can cast it to a type T which is a value type? The as operator doesn't work, since T is a value type, and o.GetType().Equals(typeof(T)) just checks if object is a boxed variable of type T, but not if it is something that can be cast to T.

Answer 1

Try this

object obj = "wer";
var isCompatible = typeof(T).IsAssignableFrom(obj.GetType());

Answer 2

You can try these:

object obj = "wer";
typeof(T).IsInstanceOfType(obj)

Read more: https://docs.microsoft.com/en-us/dotnet/api/system.type.isinstanceoftype?view=netcore-3.1

Or

object obj = "wer";
obj is T;

Read more: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/is

Or

object obj = "wer";
typeof(T).IsAssignableFrom(obj.GetType())

Read more: https://docs.microsoft.com/en-us/dotnet/api/system.type.isassignablefrom?view=netcore-3.1

However you need to note about the differences between IsAssignableFrom and IsInstanceOfType and is . Read more here:

https://stackoverflow.com/a/497001/1666800

https://stackoverflow.com/a/15853224/1666800