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Loop Through LINQ Results


Loop Through LINQ Results

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Loop Through LINQ Results
Tag : vb.net , By : GunnarHafdal
Date : November 25 2020, 07:06 PM

I wish did fix the issue. This has nothing to do with LINQ. It would happen looping through a simple array or any other list too.
In the project that works, either Option Infer is turned on, or Option Explicit is turned off. In the project that does not work, Option Infer is off and Option Explicit is on.

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How to Loop through LINQ results (VB.NET)


Tag : vb.net , By : Cesar Sanz
Date : March 29 2020, 07:55 AM
should help you out The error message is saying that the objects stored in the bt_Regions property are of type String and so they don't have the member Region which you're trying to access.
I would double-check what is the type of DAL.bt_Regions - it looks like you're assuming that it returns some class, but it seems to be returning a collection of strings (perhaps just region names?). To see what it contains, you can modify the code like this:
HttpContext.Current.Response.Write(item & vbCrLf) // to print the string 

Error trying to loop through Linq query results


Tag : linq , By : rixtertech
Date : March 29 2020, 07:55 AM
help you fix your problem The loop is re-adding the same agentProdTraining object even though property values are changed. Create a new instance for each loop execution.
foreach (var pt in prodCodes.ToList())
{
  var agentProdTraining = new AgentProductTraining();

  agentProdTraining.SymNumber = symNumber;
  agentProdTraining.CourseCode = course.CourseCode;
  agentProdTraining.ProductCode = pt.ProductCode;
  agentProdTraining.DateTaken = course.DateTaken;
  agentProdTraining.Method = course.Method;
  agentProdTraining.LastChangeOperator = requestor;
  agentProdTraining.LastChangeDate = DateTime.Now;
  agentProdTraining.DateExpired = course.ExpirationDate;
  agentProdTraining.ProductCode = pt.ProductCode;
  agentProdTraining.NoteId = pt.NoteId;

  _db.AgentProductTraining.AddObject(agentProdTraining);
  _db.SaveChanges();

  PtAdded++;

  EventLog.WriteEntry(sSource, "Product Training added", EventLogEntryType.Warning);
}

LINQ results change at end of for loop


Tag : chash , By : user152319
Date : March 29 2020, 07:55 AM
wish of those help You are getting bitten by LINQ's lazy execution and closure.
When you create an enumerable like you are doing here...
result =  
    from value in values  
    where value.StartsWith(  
        string.Join(".", splitFqdn.Take(i)))  
    select value;  
void MyMethod()  
{  
    string fqdn = "host-6.domain.local";  
    string[] splitFqdn = fqdn.Split('.');  
    List<string> values = new List<string>();  
    values.add("host-1");  
    values.add("host-2.domain.local");  
    values.add("host-3.domain.local");  
    values.add("host-4");  
    values.add("host-5.other.local");  
    IEnumerable<string> queryResult = null;
    List<string> correctResult = null;
    for (int i = splitFqdn.Length; i > 0; i--)  
    {  
        queryResult =  
            from value in values  
            where value.StartsWith(  
                string.Join(".", splitFqdn.Take(i)))  
            select value;
        correctResult = queryResult.ToList();
        Console.WriteLine(  
            "Inside for loop, take " + i + ": "  + queryResult.Count());  
    }  
    Console.WriteLine();  
    Console.WriteLine(  
        "Outside for loop queryResult: " + queryResult.Count());  
    Console.WriteLine(  
        "Outside for loop correctResult: " + correctResult.Count());  
}
void MyMethod()  
{
    string fqdn = "host-6.domain.local";
    string[] splitFqdn = fqdn.Split('.');
    List<string> values = new List<string>();
    values.Add("host-1");
    values.Add("host-2.domain.local");
    values.Add("host-3.domain.local");
    values.Add("host-4");
    values.Add("host-5.other.local");
    values.Add("host-5.other.local");
    IEnumerable<string> queryResult = null;
    List<string> correctResult = new List<string>();
    for (int i = splitFqdn.Length; i > 0; i--)
    {
        correctResult = correctResult
            .Union(values.Where(
                value => value.StartsWith(string.Join(".", splitFqdn.Take(i)))))
            .ToList();
    }
}

ASP.NET Deserialize JSON with LINQ and loop through results


Tag : asp.net , By : user118656
Date : March 29 2020, 07:55 AM
should help you out I'm trying to deserialize a JSON string and then loop through it's results. I started here: http://www.newtonsoft.com/json/help/html/QueryJsonLinq.htm ,
Dim data As JObject = JObject.Parse(json)

Dim postTitles = From doc In data("response")("docs")
                 Select doc("title").Tostring()

For Each item In postTitles
    Log("title", item)
Next

c# loop through linq results and update field


Tag : chash , By : demize95
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You are getting the error because rss is a list of an anonymous type and not of the type of the items in your result collection. These anonymous types are immutable and that is why you can't assign the values.
Instead try this:
var rss = result.Select(x => new { SampleDate = x.SampleDate?.AddMilliseconds(1), x.DataValue })
                .OrderBy(a => a.SampleDate).ToList();
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