设置反射属性具有字符串值 [英] Setting a property by reflection with a string value
问题描述
我想通过反射来设置对象的属性,类型字符串
的值。
所以,举例来说,假设我有一个船舶
类,以纬度
的一个属性,它是一个双击
。
I'd like to set a property of an object through Reflection, with a value of type string
.
So, for instance, suppose I have a Ship
class, with a property of Latitude
, which is a double
.
下面是我想做什么:
Ship ship = new Ship();
string value = "5.5";
PropertyInfo propertyInfo = ship.GetType().GetProperty("Latitude");
propertyInfo.SetValue(ship, value, null);
由于是,这将引发一个的ArgumentException
:
类型'System.String'的对象不能转换为类型'System.Double。
Object of type 'System.String' cannot be converted to type 'System.Double'.
我怎么可以转换价值为适当的类型,根据的PropertyInfo
?
How can I convert value to the proper type, based on propertyInfo
?
推荐答案
您可以使用 Convert.ChangeType()
- 它允许你使用任何 IConvertible
键入改再presentation运行时信息格式。并非所有的转换是可能的,虽然,你可能需要编写特殊情况的逻辑,如果你想从不在 IConvertible
。
You can use Convert.ChangeType()
- It allows you to use runtime information on any IConvertible
type to change representation formats. Not all conversions are possible, though, and you may need to write special case logic if you want to support conversions from types that are not IConvertible
.
相应的code(不带异常处理或特殊情况下,逻辑)将是:
The corresponding code (without exception handling or special case logic) would be:
Ship ship = new Ship();
string value = "5.5";
PropertyInfo propertyInfo = ship.GetType().GetProperty("Latitude");
propertyInfo.SetValue(ship, Convert.ChangeType(value, propertyInfo.PropertyType), null);
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