C# 如何从值的类型和名称创建枚举对象?
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How to create enum object from its type and name of the value?
提问by
I have a type (System.Type) of an enum and a string containing enumeration value to set.
我有一个枚举类型 (System.Type) 和一个包含要设置的枚举值的字符串。
E.g. given:
例如给出:
enum MyEnum { A, B, C };
I have typeof(MyEnum) and "B".
我有 typeof(MyEnum) 和“B”。
How do I create MyEnum object set to MyEnum.B?
如何创建设置为 MyEnum.B 的 MyEnum 对象?
回答by Yuval
MyEnum enumValue = (MyEnum)Enum.Parse(typeof(MyEnum), "B");
You also have a case-insensitive overload.
您还有一个不区分大小写的重载。
回答by Pavel Chuchuva
I assume you don't have access to MyEnum, only to typeof(MyEnum):
我假设您无权访问 MyEnum,只能访问 typeof(MyEnum):
void foo(Type t)
{
Object o = Enum.Parse(t, "B");
}
回答by Brad Patton
You can do this with generics. I created a Utility class to wrap this:
你可以用泛型来做到这一点。我创建了一个 Utility 类来包装它:
public static class Utils {
public static T ParseEnum<T>(string value) {
return (T)Enum.Parse(typeof(T), value, true);
}
Then invoked like:
然后像这样调用:
string s = "B";
MyEnum enumValue = Utils.ParseEnum<MyEnum>(s);