C#:来自 System.Type 的动态解析

C#: Dynamic parse from System.Type(C#:来自 System.Type 的动态解析)

问题描述

我有一个类型、一个字符串和一个对象.

I have a Type, a String and an Object.

有什么方法可以调用解析方法或动态转换字符串上的那种类型吗?

Is there some way I can call the parse method or convert for that type on the string dynamically?

基本上如何删除此逻辑中的 if 语句

Basically how do I remove the if statements in this logic

object value = new object();    
String myString = "something";
Type propType = p.PropertyType;

if(propType == Type.GetType("DateTime"))
{
    value = DateTime.Parse(myString);
}

if (propType == Type.GetType("int"))
{
    value = int.Parse(myString);
}

做一些类似这样的事情.

And do someting more like this.

object value = new object();
String myString = "something";
Type propType = p.PropertyType;


//this doesn't actually work
value = propType .Parse(myString);  

推荐答案

TypeDescriptor 来救援！:

var converter = TypeDescriptor.GetConverter(propType);
var result = converter.ConvertFrom(myString);

所有原始类型(加上 Nullable 和许多其他内置类型)已经集成到 TypeConverter 基础结构中，因此支持开箱即用".

All primitive types (plus Nullable<TPrimitive>, and numerous other built-in types) are integrated into the TypeConverter infrastructure already, and are thus supported 'out-of-the-box'.

要将自定义类型集成到 TypeConverter 基础架构中，请实现您自己的 TypeConverter 并使用 TypeConverterAttribute 来装饰要转换的类，用你的新 TypeConverter

To integrate a custom type into the TypeConverter infrastructure, implement your own TypeConverter and use TypeConverterAttribute to decorate the class to be converted, with your new TypeConverter

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