public struct Items
{
public string Id;
public string Name;
}
public Items[] _items = null;
if (_items.Contains("Table"))
{
// i need to check the structure and need to return correponding id
}
and am having a list of variables in my structure variable...
i need to search a Name in the structure(_items) and i want to return the Corresponding Id.
how to do this,
foreach (Items item in _items)
{
if (item.Name.Contains("search string"))
{
return item.Id;
}
}
Related
I am writing my first web API controller so I am a bit of a noob in this area. I am trying to retrieve a list of data through a static class called CustomerDataSource:
public static class CustomerDataSource
{
public static List<Customer> customerData
{
get
{
Customer customer1 = new Customer() { name = "Bert", address = "London" };
Customer customer2 = new Customer() { name = "Jon", address = "New York" };
List<Customer> listCustomers = new List<Customer>();
listCustomers.Add(customer1);
listCustomers.Add(customer2);
return listCustomers;
}
}
}
public class Customer
{
public string name { get; set; }
public string address { get; set; }
}
I am a bit stuck with my ApiController because I am trying to sort the list either on 'name' or 'address' but using a string called 'field' does not compile. What would be a good implementation for a WebAPI controller GETmethod which provides for sorting on one of the Customer properties ?
public class ValuesController : ApiController
{
// GET api/values
public List<Customer> Get(string field)
{
var list = CustomerDataSource.customerData.OrderBy(field);
}
}
Create an extension method like below, then you can use it anywhere within the same namespace in your project.
public static class extensionmethods
{
public static IQueryable<T> OrderByPropertyName<T>(this IQueryable<T> q, string SortField, bool Ascending)
{
var param = Expression.Parameter(typeof(T), "p");
var prop = Expression.Property(param, SortField);
var exp = Expression.Lambda(prop, param);
string method = Ascending ? "OrderBy" : "OrderByDescending";
Type[] types = new Type[] { q.ElementType, exp.Body.Type };
var rs = Expression.Call(typeof(Queryable), method, types, q.Expression, exp);
return q.Provider.CreateQuery<T>(rs);
}
}
Then you can use it like:
public List<Customer> Get(string PropertyName)
{
var list = CustomerDataSource.customerData.AsQueryable().OrderByPropertyName("PropertyName",true).ToList();
}
Note:
Because the extension method uses IQueryable and returns IQuerybale, so you need to convert your List to IQueryable. Also you can order the list by ascending and descending order, just pass the boolean type value to the second parameter. The default is ascending.
You need to use a lambda expression.
if (field == "name")
var list = CustomerDataSource.customerData.OrderBy(d => d.name);
else if (field == "address")
var list = CustomerDataSource.customerData.OrderBy(d => d.address);
I am trying to use Neo4jClient (and am new to C#) to build and retrieve data from Neo4j. First, I build the items and relations to a search:
NodeReference<Search> searchNode = client.Create(searches[i]);
itmNode = client.Create(items[j], new IRelationshipAllowingParticipantNode<Item>[0],
new[]
{
new IndexEntry("Item")
{
{"Type", items[j].Type },
{"ItemDescription", items[j].ItemDescription },
{"ItemNumber", items[j].ItemNumber }
}
});
client.CreateRelationship(itmNode, new SearchedFor(searchNode, 1));
Then, I am testing the retrieval of the node back from Neo4j:
var results = client.Cypher.Start("n", itemDict[firstitem])
.Match("n-[r]->()<-[r2]-other")
.Return<Node<Item>>("other")
.Results;
var node6 = ((IRawGraphClient)client).ExecuteGetCypherResults<Node<Item>>(new Neo4jClient.Cypher.CypherQuery("start n=node(6) return n;", null,Neo4jClient.Cypher.CypherResultMode.Set)).Select(un => un.Data);
"results" returns the 2 nodes that are related to node(6). "node6" is other code I found that I thought would return node 6. Both of these return the nodes, but the properties returned are all blank. I can see the properties in the Neo4j Monitoring Tool, but not when they are returned using Neo4jClient. Am I missing something in how I am setting up the nodes, or on how I am retrieving the data?
My object return shows Data.ItemDescription="", Data.ItemNumber=0, Reference=Node 5
Adding the "Select(un => un.Data)" after .Results did not work like I saw in other examples like this
Please let me know if you need more information.
Neo4jClient version 1.0.0.579
Neo4j version 1.8.2
Here is the item class:
public class Item
{
private string _name;
private string _desc;
private long _id;
public Item(string name, string desc, long id)
{
_name = name;
_desc = desc;
_id = id;
}
public Item()
{
_name = "";
_desc = "";
_id = 0;
}
public long ItemNumber
{
get
{
return _id;
}
}
public string ItemDescription
{
get
{
return _desc;
}
}
public string Type
{
get
{
return "Item";
}
}
}
Making it work
The issue is that your Item class has no setters exposed. There's no way for us to set those properties , so we ignore them.
You can delete half your code, and it'll work. :)
public class Item
{
public long ItemNumber { get; set; }
public string ItemDescription { get; set; }
public string Type { get ; set; }
}
Making it better
Replace this:
NodeReference<Search> searchNode = client.Create(searches[i]);
itmNode = client.Create(items[j], new IRelationshipAllowingParticipantNode<Item>[0],
new[]
{
new IndexEntry("Item")
{
{"Type", items[j].Type },
{"ItemDescription", items[j].ItemDescription },
{"ItemNumber", items[j].ItemNumber }
}
});
client.CreateRelationship(itmNode, new SearchedFor(searchNode, 1));
with this:
var searchNode = client.Create(searches[i]);
var itemNode = client.Create(
items[j],
new[] { new SearchedFor(searchNode, 1) }
new[]
{
new IndexEntry("Item")
{
{"Type", items[j].Type },
{"ItemDescription", items[j].ItemDescription },
{"ItemNumber", items[j].ItemNumber }
}
});
That will create that second node, and the relationship, in a single call.
I have this class as parent class:
public partial class GetStuffResult
{
private int _Id;
private string _Name;
public GetStuffResult()
{
}
[Column(Storage="_Id", DbType="INT NOT NULL")]
public int Id
{
get
{
return this._Id;
}
set
{
if ((this._Id != value))
{
this._Id = value;
}
}
}
[Column(Storage="_Name", DbType="NVarChar(100)")]
public string Name
{
get
{
return this._Name;
}
set
{
if ((this._Name != value))
{
this._Name = value;
}
}
}
}
This is base class which has same methods with exception of an extra method:
public partial class GetStuffResult1
{
private int _Score;
private int _Id;
private string _Name;
public GetStuffResult1()
{
}
[Column(Storage="_Score", DbType="INT NOT NULL")]
public int Id
{
get
{
return this._Score;
}
set
{
if ((this._Score != value))
{
this._Score = value;
}
}
}
[Column(Storage="_Id", DbType="INT NOT NULL")]
public int Id
{
get
{
return this._Id;
}
set
{
if ((this._Id != value))
{
this._Id = value;
}
}
}
[Column(Storage="_Name", DbType="NVarChar(100)")]
public string Name
{
get
{
return this._Name;
}
set
{
if ((this._Name != value))
{
this._Name = value;
}
}
}
}
I have done inheritance before but i am totally confused how it will work in this scenario? How can i inherit GetStuffResult so that i can use its 2 methods and dont have to copy paste same code twice in GetStuffResult1.
Will appreciate if someone can give example with code as i am new to .net 3.5 and still trying to learn it.
I am not sure if I correctly understood your question. (Your current code for GetStuffResult1 shouldn't compile as you have define Id property twice.) If you are looking to inherit from GetStuffResult then this would do (See Inheritance):
public partial class GetStuffResult1 : GetStuffResult
{
private int _Score;
public GetStuffResult1()
{
}
[Column(Storage = "_Score", DbType = "INT NOT NULL")]
public int Id
{
get
{
return this._Score;
}
set
{
if ((this._Score != value))
{
this._Score = value;
}
}
}
}
Notice that I have removed _Id and _Name from the child class. This however will give you warning that:
GetStuffResult1.Id' hides inherited member
'ThreadConsoleApp.GetStuffResult.Id'. Use the new keyword if hiding
was intended.
The second thing I am thinking about your question if you are confused about using partial classes and you may need a single class in multiple source file. In that case you may use partial keyword. If that is the case and you don't need inheritance then you need to use a single name for the class. e.g. GetStuffResult. In that particular case your GetStuffResult1 will become:
public partial class GetStuffResult
{
private int _Score;
public GetStuffResult1()
{
}
[Column(Storage = "_Score", DbType = "INT NOT NULL")]
public int Id
{
get
{
return this._Score;
}
set
{
if ((this._Score != value))
{
this._Score = value;
}
}
}
}
This will be similar to having a single class with all the combined properties.
Edit:
To access the base class properties in the child class, you may use base keyword.
base.Id = 0;
base.Name = "SomeName";
To access the base class properties from the object of GetStuffResult1, see the following example.
GetStuffResult1 gsr1 = new GetStuffResult1();
gsr1.Id = 0;
gsr1.Name = "SomeName";
Here gsr1.Name is from the base class, you may use different name for Id in either base or child class so that it can be more clearer.
I like to know how to initialise the array without the loops like for, foreach or any LINQ.
From the following code, need to find under 2m length cars within .Netframework using console application.
{
ArrayList = CarType new ArrayList();
CarType.Add(new CarList("Ford"));
((CarList)CarType[0]).Cars.Add(new Car("Focus", 2));
((CarList)CarType[0]).Cars.Add(new Car("Fiesta", 1));
CarType.Add(new CarList("Peugeout"));
((CarList)CarType[1]).Cars.Add(new Car("206", 1));
((CarList)CarType[1]).Cars.Add(new Car("407", 2));
RemoveLargeCars(CarType);
}
public static ArrayList RemoveLargeCars (ArrayList CarType)
{
//Array List should be here
return CarType;
}
It has got two classes as follows.
class Car
{
public string name;
public float length;
public Car(string newName, float newLength)
{
this.name = newName;
this.length = newLength;
}
}
Class CarList
{
public string CarType;
public ArrayList Pipes;
public CarList(string newCarType)
{
carType = newCarType;
Cars = new ArrayList();
}
}
Can you please let me know how to solve this.
Thanks in advance.
Use the static Adapter method on ArrayList
CarType = ArrayList.Adapter(CarList);
But that probably uses a loop internally, you can't get away from them, but at least this hides them.
Well, first of all you should use the generic list type List<T> instead of ArrayList, that will make the code simpler. (And best practive recommends properties rather than public fields):
class Car {
public string Name { get; set; }
public float Length { get; set; }
public Car(string newName, float newLength) {
Name = newName;
Length = newLength;
}
}
class CarList {
public string CarType { get; set; }
public List<Car> Cars { get; set; }
public CarList(string newCarType, List<Car> newCars) {
CarType = newCarType;
Cars = newCars;
}
public CarList(string newCarType) : this(newCarType, new List<Car>()) {}
}
Now use a List<CarList>:
List<CarList> CarType = new List<CarList>();
CarList ford = new CarList("Ford");
CarType.Add(ford);
ford.Cars.Add(new Car("Focus", 2));
ford.Cars.Add(new Car("Fiesta", 1));
CarList peugeot = new CarList("Peugeout");
CarType.Add(peugeot);
peugeot.Cars.Add(new Car("206", 1));
peugeot.Cars.Add(new Car("407", 2));
List<CarList> smallCars = RemoveLargeCars(CarType);
You can use extension methods to easily filter out cars based on a condition:
public static List<CarList> RemoveLargeCars(List<CarList> CarType) {
return CarType.Select(
t => new CarList(t.CarType, t.Cars.Where(c => c.Length < 2f).ToList()
) .ToList();
}
Note that the method doesn't change the original list, but creates a new list.
I'm working on creating a text-based adventure game that involves several rooms, items within rooms, and moving back and forth throughout these rooms. The room neighbors are stored within a HashMap, which I have no experience with at all. I have a method called getNeighbor that's meant to return the room's neighbor in the requested direction but I can't figure out how to do that. Here's the code:
public class Room
{
private String roomDescript;
private Item item;
private HashMap <String, Room> myNeighbors;
public Room (String pDescription){
roomDescript = pDescription;
item = null;
}
public Room (String pDescription, Item pItem){
roomDescript = pDescription;
item = pItem;
}
public String setRoomDescript(){
return this.roomDescript;
}
public String getRoomDescript(){
return this.roomDescript;
}
public Item setItem(){
return this.item;
}
public Item getItem(){
return this.item;
}
public void addItem (Item i){
i = item;
}
public boolean hasItem(){
if(item != null){
return true;
}else{
return false;
}
}
public void addNeighbor (String pDirection, Room r){
myNeighbors.put(pDirection, r);
}
public Room getNeighbor (String pDirection){
if(myNeighbors.containsKey(pDirection)){
return ;
}else{
return null;
}
}
}
It sounds like you can just change your method to:
public Room getNeighbor (String pDirection) {
return myNeighbours.get(pDirection);
}
After all, Map.get() will return null if the key isn't found anyway.
Use HashMap.get(pDirection):
public Room getNeighbor (String pDirection){
return myNeighbors.get(pDirection);
}
Note that you don't need the if-statement since get() returns null already if there is no much.