I'm writing a bit of code, and I'd like to play with doing it using the anonymous features of C#.
I'm writing a summary based on a DataTable returned from the SQL Server.
There are many ways I could write it already knowing Classical C# (???), but I'm interested in having a little fun.
So, here are the type of anonymous classes I want to have:
// Employee
var emp = new {
Badge = "000000",
Name = "No Name",
Parts = new List<Part>(),
Days = new List<DateTime>(),
};
// Part
var part = new {
SerialNumber = "N/A",
Date = DateTime.MinValue,
Badge = "000000",
};
Now, as I iterate over my DataTable entries, I want to sort my Parts by SerialNumber.
The first thing I have to do is break the data down into days.
private void TestMethod(DateTime minDate, DateTime maxDate, DataTable table) {
int days = 1;
var nextDay = minDate.AddHours(24);
foreach (DataRow row in table.Rows) {
var dateTime = (DateTime)row["Date_Time"];
var emp = new {
Badge = row["Badge"].ToString(),
Parts = new List<Part>(),
Days = new List<DateTime>(),
};
var part = new {
SerialNumber = row["Serial_Number"].ToString(),
Date = dateTime,
Badge = row["Badge"].ToString(),
};
if (nextDay < dateTime) {
days++;
nextDay = nextDay.AddHours(24);
}
}
Now, it is getting a little interesting.
I need a way to store Part information for the different days and the different employees found for the period.
How would I create and use an anonymous collection of my anonymous class items?
var parts = new List<typeof(part)>();
var emps = new List<typeof(emp)>();
Using typeof (above) does not work!
What does?
You need to use type inference:
new[] { part }.ToList()
(you probably want to clear the list afterwards)
You can also make a helper method:
public static List<T> ListOf<T>(T sample) {
return new List<T>();
}
var parts = ListOf(part);
Related
IEnumerable<WebsiteWebPage> data = GetWebPages();
foreach (var value in data)
{
if (value.WebPage.Contains(".htm"))
{
WebsiteWebPage pagesinfo = new WebsiteWebPage();
pagesinfo.WebPage = value.WebPage;
pagesinfo.WebsiteId = websiteid;
db.WebsiteWebPages.Add(pagesinfo);
}
}
db.SaveChanges();
I want to add only distinct values to database in above code. Kindly help me how to do it as I am not able to find any solution.
IEnumerable<WebsiteWebPage> data = GetWebPages();
foreach (var value in data)
{
if (value.WebPage.Contains(".htm"))
{
var a = db.WebsiteWebPages.Where(i => i.WebPage == value.WebPage.ToString()).ToList();
if (a.Count == 0)
{
WebsiteWebPage pagesinfo = new WebsiteWebPage();
pagesinfo.WebPage = value.WebPage;
pagesinfo.WebsiteId = websiteid;
db.WebsiteWebPages.Add(pagesinfo);
db.SaveChanges();
}
}
}
This is the code that I used to add distinct data.I hope it helps
In addition to the code sample Furkan Öztürk supplied, Make sure your DB has a constraint so that you cannot enter duplicate values in the column. Belt and braces approach.
I assume that by "distinct values" you mean "distinct value.WebPage values":
// get existing values (if you ever need this)
var existingWebPages = db.WebsiteWebPages.Select(v => v.WebPage);
// get your pages
var webPages = GetWebPages().Where(v => v.WebPage.Contains(".htm"));
// get distinct WebPage values except existing ones
var distinctWebPages = webPages.Select(v => v.WebPage).Distinct().Except(existingWebPages);
// create WebsiteWebPage objects
var websiteWebPages = distinctWebPages.Select(v =>
new WebsiteWebPage { WebPage = v, WebsiteId = websiteid});
// save all at once
db.WebsiteWebPages.AddRange(websiteWebPages);
db.SaveChanges();
Assuming that you need them to be unique by WebPage and WebSiteId
IEnumerable<WebsiteWebPage> data = GetWebPages();
foreach (var value in data)
{
if (value.WebPage.Contains(".htm"))
{
WebsiteWebPage pagesinfo = new WebsiteWebPage();
if (db.WebsiteWebPages.All(c=>c.WebPage != value.WebPage|| c.WebsiteId != websiteid))
{
pagesinfo.WebPage = value.WebPage;
pagesinfo.WebsiteId = websiteid;
db.WebsiteWebPages.Add(pagesinfo);
}
}
}
db.SaveChanges();
UPDATE
To optimize this (given that your table contains much more data than your current list), override your equals in WebsiteWebPage class to define your uniqueness criteria then:
var myWebsiteWebPages = data.select(x=> new WebsiteWebPage { WebPage = x.WebPage, WebsiteId = websiteid}).Distinct();
var duplicates = db.WebsiteWebPages.Where(x=> myWebsiteWebPage.Contains(x));
db.WebsiteWebPages.AddRange(myWebsiteWebPages.Where(x=> !duplicates.Contains(x)));
this is a one database query to retrieve ONLY duplicates and then removing them from the list
You can use the following code,
IEnumerable<WebsiteWebPage> data = GetWebPages();
var templist = new List<WebsiteWebPage>();
foreach (var value in data)
{
if (value.WebPage.Contains(".htm"))
{
WebsiteWebPage pagesinfo = new WebsiteWebPage();
pagesinfo.WebPage = value.WebPage;
pagesinfo.WebsiteId = websiteid;
templist.Add(pagesinfo);
}
}
var distinctList = templist.GroupBy(x => x.WebsiteId).Select(group => group.First()).ToList();
db.WebsiteWebPages.AddRange(distinctList);
db.SaveChanges();
Or you can use MoreLINQ here to filter distinct the list by parameter like,
var res = tempList.Distinct(x=>x.WebsiteId).ToList();
db.WebsiteWebPages.AddRange(res);
db.SaveChanges();
When I am Trying to save current list of data into database, I need to get already existing data from database, and need to compare with current list of data.
I have two lists one is PreviousList(existing data from DB) and other is CurrentList(Modified data)
public class SoftClose
{
public int ID = -1;
public int AID = -1;
public int WFID = -1;
public string PREFIX;
public DateTime SCDATE;
public string STATUS;
}
In CurrentList I modified Prefix to D2 where ID=1 and added new row(Id=4)...
My req is
When I am trying to save CurrentList to Db,
If there is any new Prefix in CurrentList that is not there in PreviousList I need to insert that new row and need to change Status to ADD for that row.
I changed Prefix to D2 where Id = 1 in CurrentList. D1 is there is DB and but not in CurrentList so i need to delete it. So i need to change the status to DELETE for that record. I should not insert D2 record where id=1 becuase D2 is already there. If I changed to D5 where Id = 1 then I need to insert it because D5 is not there in DB So i need to change the status to UPDATE.
How to do this? What is the best approach to compare lists
here is a solution you could try:
List<SoftClose> previousList = new List<SoftClose>(){
new SoftClose(){ID=1, Status = "NO_CHANGE",AID="19", Prefix = "D1"},
new SoftClose(){ID=2, Status = "NO_CHANGE",AID="20", Prefix = "D2"},
new SoftClose(){ID=3, Status = "NO_CHANGE",AID="21", Prefix = "D3"}
};
List<SoftClose> currentList = new List<SoftClose>(){
new SoftClose(){ID=1, Status = "NO_CHANGE",AID="19", Prefix = "D2"},
new SoftClose(){ID=2, Status = "NO_CHANGE",AID="20", Prefix = "D2"},
new SoftClose(){ID=3, Status = "NO_CHANGE",AID="21", Prefix = "D6"},
new SoftClose(){ID=4, Status = "NO_CHANGE",AID="22", Prefix = "D4"},
new SoftClose(){ID=5, Status = "NO_CHANGE",AID="22", Prefix = "D5"}
};
var addlist = currentList.Where(c => previousList.All(p => !p.ID.Equals(c.ID) && !p.Prefix.Equals(c.Prefix)));
foreach(var n in addlist)
{
var index = currentList.FindIndex(p => p.Prefix.Equals(n.Prefix));
currentList[index].Status = "ADD";
}
var updateORdeletelist = currentList.Where(c => c.Status.Equals("NO_CHANGE") && previousList.Exists(p => p.ID.Equals(c.ID) && !p.Prefix.Equals(c.Prefix)));
foreach (var n in updateORdeletelist)
{
var index = currentList.FindIndex(p => p.Prefix.Equals(n.Prefix));
if (previousList.FindIndex(p => p.Prefix.Equals(n.Prefix)) < 0)
currentList[index].Status = "UPDATE";
else
currentList[index].Status = "DELETE";
}
foreach (var item in currentList)
{
Console.WriteLine($"Id:{item.ID}, Desc1:{item.Prefix}, Status:{item.Status}");
}
output
Id:1, Desc1:D2, Status:DELETE
Id:2, Desc1:D2, Status:NO_CHANGE
Id:3, Desc1:D6, Status:UPDATE
Id:4, Desc1:D4, Status:ADD
Id:5, Desc1:D5, Status:ADD
There is a tool called Side by Side SQL Comparer in C# at https://www.codeproject.com/Articles/27122/Side-by-Side-SQL-Comparer-in-C.
basic use of the component:
using (TextReader tr = new StreamReader(#"c:\1.sql"))
{
sideBySideRichTextBox1.LeftText = tr.ReadToEnd();
}
using (TextReader tr = new StreamReader(#"c:\2.sql"))
{
sideBySideRichTextBox1.RightText = tr.ReadToEnd();
}
sideBySideRichTextBox1.CompareText();
You load the left and right sides to their respective variables sideBySideRichTextBox1.LeftText and sideBySideRichTextBox1.RightText and compare them with sideBySideRichTextBox1.CompareText();
In your case the 1.sql and 2.sql would be your PreviousList and CurrentList -database files.
There is more detailed documentation at the project-site.
I currently work on a Windows Forms application and I have 3 lists of data and I want to add every list to a column of a datagrid. Is there a way how I can do this.
XDocument doc = XDocument.Load(Globals.pathNotifFile);
var dates = doc.Descendants("Date");
var hours = doc.Descendants("Time");
var message = doc.Descendants("Message");
var hoursCollection = new List<String>();
var dateCollection = new List<String>();
var messageCollection = new List<String>();
foreach (var date in dates)
{
dateCollection.Add(date.Value);
}
foreach (var hour in hours)
{
hoursCollection.Add(hour.Value);
}
foreach (var messages in message)
{
messageCollection.Add(messages.Value);
}
return Tuple.Create(hoursCollection,dateCollection, messageCollection);
}
The easiest way to accomplish this task is to build one object which contains your three datapoints. For example:
public class MyGridDateTime
{
public string Hour{get;set;}
public string Date{get;set;}
public string Message{get;set;}
}
public void InitalizeGrid()
{
List<MyGridDateTime> list = new List<MyGridDateTime>();
int i = 0;
foreach (string hour in hoursCollection)
{
list.Add(new MyGridDateTime {Hour = hour, Date = dateCollection[i], Message = messageCollection[i]};
i++;
}
grid.DataSource = list;
}
Note this only works if all of your Lists contain similiar amount of data. Else you need to update this a bit to become string.empty instead of Exception if your Lists are not of the same size.
I'm trying to return documents from the collection where id = 1 and date created is less than the current time.
I tried this, but it isn't working:
var collection = database.GetCollection("test");
var time = DateTime.Now;
var query2 = new QueryDocument
{
{ "id", 1},
{{"created_on", {"$lt",time}}
};
What's wrong with this query?
You need an embedded document for the $lt sub-object, but you forgot to create it:
var query = new QueryDocument {
{ "id", 1 },
{ "created_on", new BsonDocument { { "$lt", time } } }
}
Also consider using the Query builder, which might make things simpler:
var query = Query.And(
Query.EQ("id", 1),
Query.LT("created_on", time)
);
I am working on below code, and what I want to do is query by object itself.
For example: I have a search form, that populates objects fields such as below. Then what I want to do is to search Elastic search based on whatever user filled the form with.
ie: below, I want to query the index by searchItem object. How can I do it easily?
class Program
{
static void Main(string[] args)
{
var p = new Program();
var item1 = new Announcement() {Id=1, Title = "john", ContentText = "lorem", Bar = false, Num = 99, Foo = "hellow"};
//p.Index(item1, "add");
var searchItem = new Announcement() {Title="john",Num=99};
ElasticClient.Search<Announcement>();
Console.Read();
}
public void Index(Announcement announcement, String operation)
{
var uriString = "http://localhost:9200";
var searchBoxUri = new Uri(uriString);
var settings = new ConnectionSettings(searchBoxUri);
settings.SetDefaultIndex("test");
var client = new ElasticClient(settings);
if (operation.Equals("delete"))
{
client.DeleteById("test", "announcement", announcement.Id);
}
else
{
client.Index(announcement, "test", "announcement", announcement.Id);
}
}
private static ElasticClient ElasticClient
{
get
{
try
{
var uriString = "http://localhost:9200";
var searchBoxUri = new Uri(uriString);
var settings = new ConnectionSettings(searchBoxUri);
settings.SetDefaultIndex("test");
return new ElasticClient(settings);
}
catch (Exception)
{
throw;
}
}
}
}
You can't :)
NEST cannot infer how to best query only based on a partially filled POCO. Should it OR or AND should it do a nested term query or a term query wrapped in a has_child? You catch my drift.
Nest does have a slick feature called conditionless queries that allow you the write out to entire query like so:
ElasticClient.Search<Announcement>(s=>s
.Query(q=>
q.Term(p=>p.Title, searchItem.Title)
&& q.Term(p=>p.Num, searchItem.Num)
//Many more queries use () to group all you want
)
)
When NEST sees that the argument passed to Term is null or empty it simply wont render that part of the query.
Read more here on how this feature works http://nest.azurewebsites.net/concepts/writing-queries.html