C＃动态类型转换 [英] C# dynamic type conversions

问题描述

我们有2个对象A& B：A是system.string，B是.net基本类型（string，int等）。我们要编写通用代码，以将B的转换（解析）值分配给A。有什么建议吗？谢谢，Adi Barda

We have 2 objects A & B: A is system.string and B is some .net primitive type (string,int etc). we want to write generic code to assign the converted (parsed) value of B into A. Any suggestions? Thanks, Adi Barda

推荐答案

进行字符串转换的最实用，最灵活的方法是使用 TypeConverter ：

The most pragmatic and versatile way to do string conversions is with TypeConverter:

public static T Parse<T>(string value)
{
    // or ConvertFromInvariantString if you are doing serialization
    return (T)TypeDescriptor.GetConverter(typeof(T)).ConvertFromString(value);
}

更多类型具有类型转换器，而不是实现 IConvertible 等，您还可以在转换时将转换器添加到新类型；

More types have type-converters than implement IConvertible etc, and you can also add converters to new types - both at compile-time;

[TypeConverter(typeof(MyCustomConverter))]
class Foo {...}

class MyCustomConverter : TypeConverter {
     // override ConvertFrom/ConvertTo 
}

以及在运行时，如果需要（对于您不拥有的类型）：

and also at runtime if you need (for types you don't own):

TypeDescriptor.AddAttributes(typeof(Bar),
    new TypeConverterAttribute(typeof(MyCustomConverter)));

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