I have a class similar to:
public class MyClass : MyBaseClass
{
public string Field1 { get; set; }
public string Field2 { get; set; }
public string Field3 { get; set; }
public string Field4 { get; set; }
}
public class MyBaseClass
{
public string BaseField1 { get; set; }
public string BaseField2 { get; set; }
public string BaseField3 { get; set; }
public string BaseField4 { get; set; }
}
I then created a method to pull the names from the class.
private void MyMethod<T>(List<T> listData) where T : class
{
String[] fieldNames = Array.ConvertAll<PropertyInfo, String>(typeof(T).GetProperties(), delegate(PropertyInfo fo) { return fo.Name; });
// Do something with the fieldNames array....
}
So when I get my array it would be in the following order:
Field1
Field2
Field3
Field4
BaseField1
BaseField2
BaseField3
BaseField4
I was wondering if it was possible to change the order so that the base class fields were first followed by the derived class fields?
Let's implement a simple method to get how deep is the class in the class hierarchy
null <- object <- ... <- MyBaseClass <- MyClass <- ...
Implementation
// 0 - null
// 1 - object
// ...
// n - MyBaseClass
// n + 1 - MyClass
// ...
private static int TypeLevel(Type type) {
if (null == type)
return 0;
return TypeLevel(type.BaseType) + 1;
}
And then with a help of Linq sort by this criterium, the only little trick is to use DeclaringType
- where (in which class) the property has been declared:
// fieldNames are actually properties' names
string[] fieldNames = typeof(MyClass)
.GetProperties()
.OrderBy(p => TypeLevel(p.DeclaringType)) // <- base first, derived last
.ThenBy(p => p.Name) // <- let's organize properties within each class
.Select(p => p.Name)
.ToArray();
Console.Write(string.Join(Environment.NewLine, fieldNames));
Outcome:
BaseField1
BaseField2
BaseField3
BaseField4
Field1
Field2
Field3
Field4
Finally, your method can be something like this:
// we don't want any restictions like "where T : class"
private void MyMethod<T>(List<T> listData) {
...
string[] fieldNames = typeof(T)
.GetProperties()
.OrderBy(p => TypeLevel(p.DeclaringType)) // <- base first, derived last
.ThenBy(p => p.Name) // <- let's organize properties within each class
.Select(p => p.Name)
.ToArray();
...
}
You will have to write some code like below to traverse the class hierarchy and then obtain the properties
static void GetProperties(Type type, List<string> returnValue) {
var props = type.GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
returnValue.AddRange(props.Select(p => p.Name).OrderBy(p => p));
}
private void MyMethod<T>(List<T> listData) where T : class {
var type = typeof(T);
List<string> properties = new List<string>();
while (type != null) {
GetProperties(type, properties);
type = type.BaseType;
}
}
Select all properties of base class and union with all properties of derived class. The Distinct() will remove all duplicates. If more complexity is needed you will have to try @Vikhram solution.
var properties = typeof(MyBaseClass).GetProperties().Select(x => x.Name)
.Union(typeof(MyClass).GetProperties().Select(x => x.Name)).Distinct();
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