public static string GetObjectDescription(PropertyInfoEx prop)
{
if (prop == null)
{
return(string.Empty);
}
if (!string.IsNullOrWhiteSpace(prop.GetDesc()))
{
return(prop.GetDesc());
}
var descs = prop.PropertyInfo.GetCustomAttributes(typeof(PropertyDescriptionAttribute), true);
if (descs == null || descs.Length == 0)
{
return(string.Empty);
}
string tname = string.Empty;
try
{
if (prop.PropertyInfo.ReflectedType.IsGenericType)
{
//tname = prop.ReflectedType.GetGenericArguments().First().ReflectedType.Name;
tname = ((Type[])prop.PropertyInfo.ReflectedType.Eval("GenericTypeArguments")).First().Name;
}
return((descs[0] as PropertyDescriptionAttribute).Desc.Replace("<T>", tname));
}
catch
{
return((descs[0] as PropertyDescriptionAttribute).Desc.Replace("<T>", "对象"));
}
}
public static object Eval(this object o, PropertyInfoEx propertyInfo)
{
if (o == null)
{
return(null);
}
if (propertyInfo == null)
{
return(null);
}
if (propertyInfo.IsSetGetValueMethed)
{
return(propertyInfo.GetValueMethed(o));
}
ParameterExpression instance = Expression.Parameter(
typeof(object), "instance");
Expression instanceCast = Expression.Convert(
instance, propertyInfo.PropertyInfo.ReflectedType);
Expression propertyAccess = Expression.Property(
instanceCast, propertyInfo.PropertyInfo);
UnaryExpression castPropertyValue = Expression.Convert(
propertyAccess, typeof(object));
Expression <Func <object, object> > lamexpress =
Expression.Lambda <Func <object, object> >(
castPropertyValue, instance);
propertyInfo.GetValueMethed = lamexpress.Compile();
return(propertyInfo.GetValueMethed(o));
}
public static void SetValue(this object o, PropertyInfoEx property, object val)
{
if (property.IsSetSetValueMethed)
{
try
{
property.SetValueMethed(o, val);
}
catch
{
try
{
property.SetValueMethed(o, Convert.ChangeType(val, property.PropertyInfo.PropertyType));
}
catch
{
throw new Exception(string.Format("字符串转换失败，无法从{0}转到{1}:{2}", val.GetType().Name, property.PropertyInfo.PropertyType.Name, val));
}
}
return;
}
var tp = o.GetType();
ParameterExpression instance = Expression.Parameter(typeof(object), "instance");
ParameterExpression valParameter = Expression.Parameter(typeof(object), "val");
//转换为真实类型
var instanceCast = Expression.Convert(instance, tp);
var valParameterCast = Expression.Convert(valParameter, property.PropertyInfo.PropertyType);
var body = Expression.Call(instanceCast, property.PropertyInfo.GetSetMethod(), valParameterCast);
var lamexpress = Expression.Lambda <Action <object, object> >(body, instance, valParameter).Compile();
property.SetValueMethed = lamexpress;
try
{
lamexpress(o, val);
}
catch
{
try
{
lamexpress(o, Convert.ChangeType(val, property.PropertyInfo.PropertyType));
}
catch
{
throw new Exception(string.Format("字符串转换失败，无法从{0}转到{1}:{2}", val.GetType().Name, property.PropertyInfo.PropertyType.Name, val));
}
}
}
//public static object EvalDrect(this object o, PropertyInfo prop)
//{
// if (o == null)
// return null;
// if (prop == null)
// return null;
// return prop.GetValue(o, null);
//}
public static Func <object, object> GetGetValueFunc(Type type, PropertyInfoEx propertyInfo)
{
ParameterExpression instance = Expression.Parameter(
typeof(object), "instance");
Expression instanceCast = Expression.Convert(
instance, propertyInfo.PropertyInfo.ReflectedType);
Expression propertyAccess = Expression.Property(
instanceCast, propertyInfo.PropertyInfo);
UnaryExpression castPropertyValue = Expression.Convert(
propertyAccess, typeof(object));
Expression <Func <object, object> > lamexpress =
Expression.Lambda <Func <object, object> >(
castPropertyValue, instance);
return(lamexpress.Compile());
}
public static Action <object, object> GetSetValueFunc(Type type, PropertyInfoEx property)
{
ParameterExpression instance = Expression.Parameter(typeof(object), "instance");
ParameterExpression valParameter = Expression.Parameter(typeof(object), "val");
//转换为真实类型
var instanceCast = Expression.Convert(instance, type);
var valParameterCast = Expression.Convert(valParameter, property.PropertyInfo.PropertyType);
var body = Expression.Call(instanceCast, property.PropertyInfo.GetSetMethod(), valParameterCast);
var lamexpress = Expression.Lambda <Action <object, object> >(body, instance, valParameter).Compile();
//property.SetValueMethed = lamexpress;
return(lamexpress);
}
