在C＃泛型类成员？ [英] Generic Class Members in C#?

问题描述

嘿，我想我有错误的想法在这里，但我不知道什么是最好的。我想用构件变量，可以是任何类型的，这取决于所需要的，此时的类。到目前为止，我有这样的事情：

Hey, I think I have the wrong idea here, but I'm not sure what is best. I want a class with a member variable that can be of any type, depending on what is needed at the time. So far, I have something like this:

    public class ConfigSetting<T> {
    private T value;

    public T GetValue() {
        return value;
    }
    public void ChangeValue() {

    }

    public ConfigSetting(string heading, string key) {
        this.value = DerivedMethods.configsettings.SettingGroups[heading].Settings[key].RawValue;
    }
}

通过的这个右侧的返回类型.value的'行是一个字符串，目前。我知道这里好像我有没有必要使用比字符串类型以外的任何其他，但最终我将扩大的构造，使得THIS.VALUE可能是一个字符串，整数，浮点，或布尔。

The type returned by the right side of the 'this.value' line is a string, currently. I know here it seems like I have no need to use anything other than the string type, but eventually I will expand the constructor, such that 'this.value' could be a string, int, float, or bool.

不管怎样，我的编译器说：无法将'字符串'到'T'，所以我认为我做的事情很落后。

Anyway, my compiler says "Cannot convert 'string' to 'T'", so I assume I'm doing something very backwards.

感谢您。

推荐答案

那么，转换你期望它适用？如果您所期望的价值已经是正确的类型，你可以这样做：

Well, what conversion did you expect it to apply? If you expect the value to already be of the right type, you could do:

object tmp = DerivedMethods.configsettings.SettingGroups[heading].Settings[key].RawValue;
this.value = (T) tmp;

请注意，你必须去通过对象隐式（如下）或有明确的转换：

Note that you have to go through object either implicitly (as here) or with an explicit cast:

this.value = (T)(object) DerivedMethods.configsettings... (etc);

这组提供通用类型的转换是比较有限的。但是，如果原始值是真正正确的它应该工作。

The set of conversions provided for generic types is somewhat limited. But it should work if the original value is genuinely correct.

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