我有以下代码:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
object o;
Person p = new Person { FirstName = "John", Surname = "Henry" };
Citizen c = new Citizen { Country = "Canada", ResidentName = p };
SportsFan sf = new SportsFan { Sport = "Hockey", Fan = c };
Discoverer<SportsFan>.SimpleExample("Sport", "Hockey",out o);
Discoverer<SportsFan>.NestedProperyExample("Fan.Citizen.FirstName", "John",out o);
}
private class Person
{
public string FirstName
{
get; set;
}
public string Surname
{
get; set;
}
}
private class Citizen
{
public Person ResidentName
{
get; set;
}
public string Country
{
get; set;
}
}
private class SportsFan
{
public string Sport
{
get; set;
}
public Citizen Fan
{
get; set;
}
}
private class Discoverer<T>
{
public static void SimpleExample(string propName, string objResultToString,out Object obj)
{
PropertyDescriptor propDesc;
propDesc = TypeDescriptor.GetProperties(typeof(T))[propName];
TypeConverter converter = TypeDescriptor.GetConverter(propDesc.PropertyType);
obj = converter.ConvertFromString(objResultToString);
}
public static void NestedProperyExample(string propName, string objResultToString, out Object obj)
{
PropertyDescriptor propDesc = null;
obj = null;
string[] nestedProperties = propName.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
propDesc = TypeDescriptor.GetProperties("Form1." + nestedProperties[0])[nestedProperties[1]];
for (int i = 1; i < nestedProperties.Length - 1; i++)
{
if (propDesc != null)
propDesc = TypeDescriptor.GetProperties(propDesc.GetType())[nestedProperties[i + 1]];
}
if (propDesc != null)
{
TypeConverter converter = TypeDescriptor.GetConverter(propDesc.PropertyType);
obj = converter.ConvertFromString(objResultToString);
}
}
}
}
该代码适用于simpleExample
. 上NestedPropertyExample
,第一个赋值PropDesc
返回null
。当我检查TypeDescriptor.GetProperties("Form1." + nestedProperties[0])
时,它返回PropertyDescriptorCollection
一个项目,即长度。
为什么我不退回更多PropertyDesriptor
商品?我会以正确的方式解决这个问题吗?
谢谢,比尔 N