I have used entity framework with code first approach.
when I am trying to pass record one by one Fromdate to Todate, 1st time its work, after it gives error like: "The property 'ID' is part of the object's key information and cannot be modified."
var fd = todaycooked.CookDate; // 2016-07-01
var td = todaycooked.ToCookDate; //2016-11-01
for (var date = fd; date <= td; date = date.AddDays(1))
{
var product = db.Products.Find(todaycooked.ProductID);
product.Qty = product.Qty + todaycooked.QTY;
todaycooked.Product = product;
todaycooked.CookDate = date;
db.TodayCookeds.Add(todaycooked);
db.SaveChanges();
}
Thanks in Advance.
You are setting the Product and CookDate once per day, so I assume you want one record per day - which means you mean one object per day. I suspect you actually want something like:
var fd = todaycooked.CookDate; // 2016-07-01
var td = todaycooked.ToCookDate; //2016-11-01
// this doesn't change per day, so only fetch it once
var product = db.Products.Find(todaycooked.ProductID);
for (var date = fd; date <= td; date = date.AddDays(1))
{
var toAdd = todaycooked.Clone(); // TODO: add a suitable clone method
toAdd.Product = product;
toAdd.CookDate = date;
db.TodayCookeds.Add(toAdd);
product.Qty = product.Qty + todaycooked.QTY;
db.SaveChanges();
}
However, you can probably also get away with moving the db.SaveChanges() to outside of the loop, which would make the whole thing atomic (rather than risking getting the first 4 of 8 days saved, then an error):
...
for (var date = fd; date <= td; date = date.AddDays(1))
{
...
}
db.SaveChanges();
I'm working with the Office365 Outlook Calendar API. I need to get events of a specific time range. I tried to compare the DateTimeTimeZone values inside of the foreach command, but it seems like it only supports a == operator:
if ( calendarEvent.Start >= new DateTimeTimeZone()
{
TimeZone = TimeZoneInfo.Local.Id,
DateTime = DateTime.Now.ToString("s")
})
This code snippet fails with the error: Cannot apply operator '>=' to operands of type 'Microsoft.Office365.OutlookServices.DateTimeTimeZone' and 'Microsoft.Office365.OutlookServices.DateTimeTimeZone'
Are there any other ways get events of a specific time range, e.g. future events?
This is my GetEvents()-method so far:
[Route("GetEvents")]
public async Task GetEvents()
{
//Get client
OutlookServicesClient client = await this.GetClient();
//Get events
var events = await client.Me.Events
.Take(10)
.ExecuteAsync();
foreach (var calendarEvent in events.CurrentPage)
{
//
if ( calendarEvent.Subject == "Test 1" )
{
System.Diagnostics.Debug.WriteLine("Event '{0}'.", calendarEvent.Subject) ;
}
}
}
You should use the CalendarView to get events within a time range.
DateTimeOffset startDateTime, endDateTime;
var events = client.Me.GetCalendarView(startDateTime, endDateTime);
Trying to read the last succesful Windows Update time from a remote machine, but getting an error on the key
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\
sample code:
var hive = RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, machineName);
var soft = hive.OpenSubKey("SOFTWARE");
var micro = soft.OpenSubKey("Microsoft");
var wind = micro.OpenSubKey("Windows");
var currver = wind.OpenSubKey("CurrentVersion");
var wu = currver.OpenSubKey("WindowsUpdate"); // returns NULL
var au = wu.OpenSubKey("Auto Update"); // throws exception "Object referece not set to an instance of an object"
var res = au.OpenSubKey("Results");
var inst = res.OpenSubKey("Install");
var lastUpdate = inst.GetValue("LastSuccessTime").ToString();
Console.WriteLine(lastUpdate);
I have verified the key is correct, and I'm not sure what the problem is.
EDIT
The error I receive is
Object reference not set to an instance of an object.
because the subkey "WindowsUpdate" is returning NULL.
The reason I was getting NULL from the OpenSubKey() method was because I needed to add a RegistryView parameter to OpenRemoteBaseKey(RegistryHive.LocalMachine, machineName, RegistryView.Default|64|32);
Thanks to comments from Alex K and this StackOverflow Answer, I was able to resolve my issue by replacing my code with the following static methods. Just add a reference to WUApiLib.dll, then
using WUApiLib;
public static IEnumerable<IUpdateHistoryEntry> GetAllUpdates(string machineName)
{
Type t = Type.GetTypeFromProgID("Microsoft.Update.Session", machineName);
UpdateSession session = (UpdateSession)Activator.CreateInstance(t);
IUpdateSearcher updateSearcher = session.CreateUpdateSearcher();
int count = updateSearcher.GetTotalHistoryCount();
IUpdateHistoryEntryCollection history = updateSearcher.QueryHistory(0, count);
return history.Cast<IUpdateHistoryEntry>();
}
public static DateTime GetLastSuccessfulUpdateTime(string machineName)
{
DateTime lastUpdate = DateTime.Parse("0001-01-01 00:00:01");
var updates = GetAllUpdates(machineName);
if (updates.Where(u => u.HResult == 0).Count() > 0)
{
lastUpdate = updates.Where(u => u.HResult == 0).OrderBy(x => x.Date).Last().Date;
}
return lastUpdate;
}
To use,
DateTime lastSuccessfulUpdate = GetLastSuccessfulUpdateTime("PC-01");
NOTE: For reference, this only returns the single most recent, successful update package's timestamp. It does not mean that all other Windows Updates have been successful. In order to get a list of failed updates, use the following:
IList<IUpdateHistoryEntry> failedUpdates = GetAllUpdates("PC-01")
.Where(upd => upd.HResult != 0).ToList();
To get all timestamps of failed updates,
IList<DateTime> failedUpdates = GetAllUpdates("PC01")
.Where(upd => upd.HResult != 0)
.Select(upd => upd.Date).ToList();
I am trying to compare a list AAA that contain Date with a range of dates. I want to see if any of the range of date is present in the list or not. If the date is present I copy the list items to another list BBB else I add empty values to the list BBB.
The problem I am having is that with my actual code, is I don`t know how not pass through the false statement of the while loop, till it reaches the end of the comparison.
With the code below, it is passing both the true and false in the while loop, which is falsifying the required result. The result I am obtaining is for every time that is present, I am having the same time as false. In short, lets say the list contains the date 6/5/2010, and the range of date is 4/5/2010 to 7/5/2010. so I will have an item created in the true part and AN ITEM CREATED INTHE FALSE PART, which is wrong. The date present can either be in true or false part. Not both, such that I have two items bing created!
How can I achieve the right result? Any other method or suggetsion please.
My code is as follows:
DateTime StartDate;
DateTime EndDate;
Datetime tempDate = StartDate;
List<DateTime> dateToEvaluate;
bool TimeIsPresent = false;
foreach (var tempItem in TaskList)
{
while (EndDate.AddDays(1) != tempDate)
{
if (tempItem.Date[0] == tempDate)
{
TimeIsPresent = True;
break;
}
else
{
if (TimeIsPresent == False)
{
if (!(tempDate.DayOfWeek == DayOfWeek.Sunday)
{
dateToEvaluate = new List<DateTime>();
dateToEvaluate.Add(tempDate);
tempTask.Add(new GroupedTask { ID = null,
TaskID = null,
Date = dateToEvaluate });
}
}
}
tempDate = tempDate.AddDays(1);
}
if (TimeIsPresent == True)
{
tempTask.Add(new GroupedTask { ID = tempItem.ID,
TaskID = tempItem.TaskID,
Date = tempItem.Date });
TimeIsPresent = false;
}
}
let me give you an example. My range of date is as follows: Mon 8 Aug - Sunday 14 Aug.
Now my tasklist is as follows: item1: Date 9Aug, item2: Date 11Aug.
So my tempTask must be as follows:
item1: Date 8 Aug, taskID: null, ID: null,
item2: Date 9 Aug, taskID: 678, ID: 7,
item3: Date 10Aug, taskID: null, ID: null,
item4: Date11 Aug, taskID:890, ID: 34,
item5: Date 12 Aug, taskID: null, ID: null,
item6: Date 13 Aug, taskID: null, ID: null
Second example:
My range of date is as follows: Mon 8 Aug - Sunday 14 Aug.
Now my tasklist is as follows: item1: Date 9Aug, item2: Date 11Aug, item3: Date 14Aug
So my tempTask must be as follows:
item1: Date 8 Aug, taskID: null, ID: null,
item2: Date 9 Aug, taskID: 678, ID: 7,
item3: Date 10Aug, taskID: null, ID: null,
item4: Date11 Aug, taskID:890, ID: 34,
item5: Date 12 Aug, taskID: null, ID: null,
item6: Date 13 Aug, taskID: null, ID: null,
item4: Date14 Aug, taskID:894, ID: 74,
I think you're making things more difficult than they really are. As I understand it, you're taking each item in TaskList and seeing if the date falls in a certain range. If it does, you add it to another List and go to the next item, otherwise you add a blank entry to the other list and keep checking.
If my understanding is correct, try this:
EDITED based on OP's comment
The code now goes through the entire range for each item in TaskList, and adds either an empty object with the date or the corresponding task for the date.
No need to use a bool to determine if the date is present in this scenario.
// Note that you'll have to assign values to StartDate and EndDate, otherwise you'll get
// a Null Reference Exception
DateTime StartDate;
DateTime EndDate;
Datetime tempDate = StartDate;
List<DateTime> dateToEvaluate;
foreach (var tempItem in TaskList)
{
// Reset tempDate to the starting date before each loop
tempDate = StartDate;
while (EndDate.AddDays(1) != tempDate)
{
if (tempDate.DayOfWeek != DayOfWeek.Sunday)
{
if (tempItem.Date[0] == tempDate)
{
tempTask.Add(new GroupedTask { ID = tempItem.ID,
TaskID = tempItem.TaskID,
Date = tempItem.Date });
}
else
{
dateToEvaluate = new List<DateTime>();
dateToEvaluate.Add(tempDate);
tempTask.Add(new GroupedTask { ID = null,
TaskID = null,
Date = dateToEvaluate });
}
}
tempDate = tempDate.AddDays(1);
}
}
EDITED to add
Assume a 2 week range, with 7/1 starting on a Monday going through 7/14. Assume two tasks - task 1 with a date of 7/3 and task 2 with a date of 7/12. I would expect the following in tempTask:
26 elements (13 dates for each of the two task items), with all elements having a null ID except for one each for the two tasks.
Are you actually wanting a consolidated list with no repeats? I.e., with my example, there would be 13 elements, and 2 would have non-null IDs? What happens if two or more tasks have the same date?
I did find one error, in that I wasn't resetting the tempDate to the start before each loop.
EDIT Based on new understanding
Ok, so you're attempting to get a second list that has all the dates in a given range, and the GroupedTask object will either be an existing GroupedTask for that date, or a null GroupedTask for that date, if there is no match.
I suggest you take a look at Enigmativity's answer, as that may be a more elegant solution (I haven't looked at it in detail), but here's another approach. The biggest change is that I flipped the while loop and foreach loops.
// Note that you'll have to assign values to StartDate and EndDate, otherwise you'll get
// a Null Reference Exception
DateTime StartDate;
DateTime EndDate;
// Declare an instance of GroupedTask for use in the while loop
GroupedTask newTask;
Datetime tempDate = StartDate;
// Loop through the entire range of dates
while (EndDate.AddDays(1) != tempDate)
{
// You included Sundays in your example, but had earlier indicated they
// weren't needed. If you do want Sundays, you can remove this outer if
// block
if (tempDate.DayOfWeek != DayOfWeek.Sunday)
{
// Create a "null" GroupedTask object
// The Date property in GroupedTask appears to be a List<DateTime>,
// so I chose to initialize it along with the other properties.
newTask = new GroupedTask() { ID = null,
TaskID = null,
Date = new List<DateTime>() { tempDate }};
// For each date in the range, check to see if there are any tasks in the TaskList
foreach (var tempItem in TaskList)
{
// If the current item's date matches the current date in the range,
// update the newTask object with the current item's values.
// NOTE: If more than one item has the current date, the last one in
// will win as this code is written.
if (tempItem.Date[0] == tempDate)
{
newTask.ID = tempItem.ID;
newTask.TaskID = tempItem.TaskID;
newTask.Date = tempItem.Date;
}
}
// Add the newTask object to the second list
tempTask.Add(newTask);
}
}
I'm not sure what is EndDate, tempDate and some other things in your example. But if you are trying to loop through a DateRange and checking the existence of a particular date, then you could consider the following example:
static void yourFunction()
{
//
//Some Stuffs
//
foreach (var tempItem in TaskList)
{
if (DateRange.Contains(tempItem.Date[0]))
{
//Do Task
}
else
{
//Do Task
}
}
//
//Some Stuffs
//
}
public static IEnumerable<DateTime> DateRange
{
get
{
for (DateTime day = startDate; day < EndDate; day = day.AddDays(1))
{
yield return day;
}
}
}
Encapsulating a range of dates on a property is the idea of Jon Skeet, I learned it from his book C# in Depth
I found your code a little confusing, but if I understand your intent then I have a solution for you using LINQ. My approach might be a bit confusing to start with, but I'm happy to help you work through it.
My understanding is that you have a range of dates that you want to create a matching list of GroupedTask objects where you will take the object(s) from an existing TaskList for each matching date in the range or create a "dummy" instance if there isn't a match.
I assume that you have defined a StartDate variable along with the EndDate variable you used in your question.
My solution (which I have tested) looks like this:
var query =
from d in dates
from t in getTasksForDate(d)
where (t.ID != null) || (d.DayOfWeek != DayOfWeek.Sunday)
select t;
tempTask.AddRange(query);
Ignoring for the moment the two parts that need to be defined (dates & getTasksForDate) the query works by running through each date from the start to the end and selecting the tasks for that date (either from the TaskList or a "dummy" task if none exist for the date) and then filtering out any "dummy" tasks that fall on a Sunday. The tasks are then added to the tempTask list.
Now for the missing parts.
To get the dates list, just do this:
var days = EndDate.Date.Subtract(StartDate.Date).Days + 1;
var dates =
Enumerable
.Range(1 - days, days)
.Select(d => EndDate.AddDays(d));
As long as StartDate is on or before EndDate you will now have a list of dates that starts on StartDate and ends on EndDate.
The getTasksForDate is the trickier part.
You need to first turn the TaskList list into a lookup function that turns any date into a list of GroupedTask objects for that date. With LINQ it's easy:
var lookup = TaskList.ToLookup(x => x.Date[0].Date, x => new GroupedTask()
{
ID = x.ID,
TaskID = x.TaskID,
Date = x.Date,
});
Next you need to create the getTasksForDate function that will take a date and return either the list of GroupedTask from the lookup for the date or a single "dummy" GroupedTask object if there were no tasks for the date.
Func<DateTime, IEnumerable<GroupedTask>> getTasksForDate = d =>
{
return lookup[d].DefaultIfEmpty(new GroupedTask()
{
ID = null,
TaskID = null,
Date = new List<DateTime>() { d, },
});
};
That's it.
If you want to define StartDate and/or EndDate based on actual values from TaskList you can use this code:
var StartDate = TaskList.Select(t => t.Date[0].Date).Min();
var EndDate = TaskList.Select(t => t.Date[0].Date).Max();
I've used .Date after most of the DateTime references to ensure that there is no time component to the date.
Yell out if you'd like any further explanation.
If I understand what you are trying to do, I would change the way you are doing it in this way. First I would find all the dates in your range that have one or mor associated tasks (and put themn in a Dictionary in order to be able to get them knowing the date), then I would create tempTask. Something like this:
DateTime StartDate;
DateTime EndDate;
DateTime tempDate = StartDate;
List<DateTime> dateToEvaluate;
Dictionary<DateTime, List<Task>> dateTaskDict = new Dictionary<DateTime, List<Task>>();
bool TimeIsPresent = false;
foreach (Task tempItem in TaskList)
{
while (EndDate.AddDays(1) != tempDate)
{
if (tempItem.Date[0] == tempDate)
{
List<Task> tasksForDate;
if (!dateTaskDict.TryGetValue(tempDate, out tasksForDate))
{
tasksForDate = new List<Task>();
dateTaskDict[tempDate] = tasksForDate;
}
tasksForDate.Add(tempItem);
break;
}
tempDate = tempDate.AddDays(1);
}
}
tempDate = StartDate;
while (EndDate.AddDays(1) != tempDate)
{
List<Task> tasks;
if (dateTaskDict.TryGetValue(tempDate, out tasks))
{
foreach (Task aTask in tasks)
tempTask.Add(new GroupedTask { ID = aTask.ID,
TaskID = aTask.TaskID,
Date = tempDate });
}
else
{
if (tempDate.DayOfWeek != DayOfWeek.Sunday)
{
tempTask.Add(new GroupedTask { ID = null
TaskID = null,
Date = tempDate });
}
}
}
I've the following problem:
I retrieve a DateTime object from SQL Server and pass it via JSON (using $.ajax) to Javascript. I have experienced difficulty trying to convert the retrieved object to a Date object in javascript.
The retrieved object is a string of value "/Date(615592800000)/". I think the value is an epoch time.
My question is, is there another way of retrieving the date object than to use regex to select the epoch value and then create a new Date object?
I'm fairly new to JS, so any help would be appreciated.
not that I know... this is the function i'm using, just in case ...
function toDateFromJson(src) {
return new Date(parseInt(src.substr(6)));
}
Try this. Pass the date string which you get to the below function. It will give you the JavaScript date object.
function (val) {
var reISO = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/;
var reMsAjax = /^\/Date\((d|-|.*)\)[\/|\\]$/;
if (val)) {
var a = reISO.exec(val);
if (a) {
val = new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6]));
return val;
}
a = reMsAjax.exec(val);
if (a) {
var b = a[1].split(/[-+,.]/);
val = new Date(b[0] ? +b[0] : 0 - +b[1]);
return val;
}
}
return val;
}
This is because JSON as standard does not have a DateTime format - vendors are free to mark it down as they want. WCF has this weird format of /Date()/
I faced this just a couple of months ago.
Using Jquery and Jquery UI it will look like that. controlId is the identifier of an element with
var converted = eval(original.replace(/\/Date\((\d+)\)\//gi, 'new Date($1)'));
The regex way is the perfectly correct way to go.
var msDateRegex = /"\\\/Date\((-?\d+)\)\\\/"/g;
var msDateJsonConverter = function(data) {
return JSON.parse($.trim(data.replace(msDateRegex, '{"__date":$1}')), function(key, value) {
return value && typeof value.__date == "number" ? new Date(value.__date) : value;
});
};
$.ajaxSetup({ converters: { "text json": msDateJsonConverter } });
See: http://weblogs.asp.net/bleroy/archive/2008/01/18/dates-and-json.aspx