[英]Cast a property to its actual type dynamically using reflection (where actual type is generic) v2
[英]Cast a property to its actual type dynamically using reflection (where actual type is generic) v3
这是代表代码片段:
using Oracle.ManagedDataAccess.Client;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace cns01
{
class Program
{
public interface IDataFieldInfo
{
bool IsSearchValue { get; set; }
}
public class DataFieldInfo2<T> : IDataFieldInfo
{
public T theValue { get; set; }
public bool IsSearchValue { get; set; } = false;
}
public class SmartRowVertrag
{
public DataFieldInfo2<int> ID { get; set; }
public DataFieldInfo2<string> VSNR { get; set; }
}
static void Main(string[] args)
{
SmartRowVertrag tester = new SmartRowVertrag();
tester.ID = new DataFieldInfo2<int>() { theValue = 777, IsSearchValue = false };
tester.VSNR = new DataFieldInfo2<string>() { theValue = "234234234", IsSearchValue = true };
var g = RetData3(tester);
}
public static object RetData3(object fsr)
{
List<OracleParameter> oParColl = new List<OracleParameter>();
var fieldProperties = fsr.GetType().GetProperties()
.Where(prop => typeof(IDataFieldInfo).IsAssignableFrom(prop.PropertyType));
foreach (var fieldProperty in fieldProperties)
{
var field = (IDataFieldInfo)fieldProperty.GetValue(fsr);
if (field.IsSearchValue)
{
OracleParameter tmpPar = new OracleParameter()
{
ParameterName = fieldProperty.Name,
Value = fieldProperty.theValue // <-- Designer error: CS1061 'PropertyInfo' does not contain a definition for 'theValue' and no accessible extension method 'theValue' accepting a first argument of type 'PropertyInfo' could be found (are you missing a using directive or an assembly reference?)
};
}
}
return null;
}
}
}
有什么方法可以独立于类型从fieldProperty
获取theValue
? 由于OracleParameter
的Value
属性是对象,因此我认为使用theValue
设置它不会有任何困难。
任何帮助将不胜感激。
事先谢谢。
我注意到你在这个问题上有 3 次尝试,这让我对回答持谨慎态度
但是,您是否有任何理由可以执行以下操作
var propertyValue = fieldProperty.GetValue(fsr);
OracleParameter tmpPar = new OracleParameter()
{
ParameterName = fieldProperty.Name,
Value = propertyValue
.GetType()
.GetProperty("theValue")
.GetValue(propertyValue)
};
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