C#通用类型转换 Convert.ChangeType

//转换对象的成任何类型
//通用型
//效率不见得有多高
//当做特殊情况处理或者练习的话可以

public static object ChangeType(object value, Type type)
{
if (value == null && type.IsGenericType) return Activator.CreateInstance(type);
if (value == null) return null;
if (type == value.GetType()) return value;
if (type.IsEnum)
{
if (value is string)
return Enum.Parse(type, value as string);
else
return Enum.ToObject(type, value);
}
if (!type.IsInterface && type.IsGenericType)
{
Type innerType = type.GetGenericArguments()[0];
object innerValue = ChangeType(value, innerType);
return Activator.CreateInstance(type, new object[] { innerValue });
}
if (value is string && type == typeof(Guid)) return new Guid(value as string);
if (value is string && type == typeof(Version)) return new Version(value as string);
if (!(value is IConvertible)) return value;
return Convert.ChangeType(value, type);
}

//转载自 http://www.cnblogs.com/youring2/archive/2012/07/26/2610035.html