logo
Tags down

shadow

yield return method optimized away when it shouldn't be


By : gafa
Date : October 14 2020, 02:21 PM
wish help you to fix your issue IEnumerable objects have deferred execution which means they are executed when they are accessed for iterating. When we start iterating or materialize an object of it to a List or Array then it's actually invoked.
If you add ToList() call to your ForEach method, you will see the expected output:
code :
After(ForEach(Sample(10), v => item = v).ToList(), () => Console.WriteLine(item));
static IEnumerable<int> Sample(int count)
{
    Console.WriteLine("Sample Invoked");
    for (int i = 0; i < count; i++)
        yield return i;
}

static IEnumerable<int> ForEach(IEnumerable<int> items, Action<int> action)
{
    Console.WriteLine("ForEach Invoked:");
    foreach (int item in items)
    {
        action(item);
        yield return item;
    }
}
int item = -1;
After(ForEach(Sample(10), v => item = v), () => Console.WriteLine(item));
Console.WriteLine(item);

After(ForEach(Sample(10), v => item = v).ToList(), () => 
Console.WriteLine(item));
Console.WriteLine(item);


Share : facebook icon twitter icon

Yield return and method state


By : shakib
Date : March 29 2020, 07:55 AM
I hope this helps you . My solution to this is to not lazily load from the database. I have a feeling it's not a good idea to load from a database lazily anyway. Instead I have added to the ExecuteReader method a transform function Func parameter. The data records that are read are then immediately converted into objects, rather than expecting the caller to take an IEnumerable and do something with it.
I liked the concision of the yield return version, but I think ultimately it is better not to lazily load from the DB.

Will the call to the last awaited method be optimized to never return INTO the method if there is nothing after it?


By : Yash Gautam
Date : March 29 2020, 07:55 AM
I wish did fix the issue. One of the scenarios where it is needed is when the last method throws an exception. Await will throw in the context of the calling method.
You may set a breakpoint on the closing brace in the method - thus, the last call returns.

Unity c# Cannot return a value from iterators. Use the yield return statement to return a value, or yield break to end t


By : Dennis Cho
Date : March 29 2020, 07:55 AM
will be helpful for those in need My suspicion is that you are simply trying to exit the co-routine when the ActionCancelled is set to true, A slight modification and you end up with this.
You cannot return a value in a co-routine but what you can do is call an external method and BREAK the (stops the forloop in it's tracks)
code :
    IEnumerator PayAdditionalCostAndPlay()
    {
        if (DiscardCost > 0 && ValidSpell())
        {
            Player.ActionCancelled = false;
            Player.targets.Clear();
            Debug.Log("this card has an additional discard cost");
            for (int i = 0; i < DiscardCost; i++)
            {
                Player.NeedTarget = 21; // a card in hand to discard

                while (Player.NeedTarget > 0) yield return new WaitForSeconds(0.1f);
                if (Player.ActionCancelled)
                {
                    Debug.Log("action cancelled");
                    OnPlayerActionCancelled(); // optional, obviously
                    break; // stop processing the for-loop
                }
            }
            if (!Player.ActionCancelled)
            {
                foreach (GameObject target in Player.targets) //discard
                    target.GetComponent<card>().Discard();
            }
        }
    }

    private void OnPlayerActionCancelled()
    {
        // Do something when a player action is cancelled
    }

Async method does not recognize yield return method?


By : user2863228
Date : March 29 2020, 07:55 AM
hop of those help? PROBLEM , yield doesn't yield unless its enumerated. In this case
code :
model.Pages = content.GetPages();
model.Pages = content.GetPages().ToList();

If you want to wrap a method that yields, does the wrapper method need to yield also, or will a return suffice?


By : Markus Wettstein
Date : March 29 2020, 07:55 AM
I hope this helps . In general, you don't need to wrap it with yield, unless you are intending to do some extra work. For instance. if you want to multiply the each value by 2:
Related Posts Related Posts :
  • Return type as IEnumerable instead of just List?
  • How to get transient DbContext in ASP.NET MVC Core?
  • Grouping data in ViewModel ASP.NET MVC & C#
  • Using a parameter's property in an ArgumentException
  • EF Unable to determine the relationship represented by navigation property
  • Moq: running flows with FluentValidation
  • "Reset" switch statement after value is equal
  • What does the question mark followed by a period mean if it is next to a variable?
  • How to P/Invoke os_log?
  • Deep copy object properties (including those with private setter) to another object of the same type
  • How to generate new back colour if two object's back colour match?
  • How to calculate percentage of value inside arbitrary range?
  • typeof(T) when T is dynamically created is null?
  • Run the application faster with Run Query at Start
  • c# code returns System.Data.DataSet instead of Data itself?
  • Compile binaries to multiple versions of .NET Framework using Bazel
  • How to hide table rows in a DataList if column data returns null from SQL Server
  • Exception handling with lambda/linq statements
  • Creating a meal Cost calculator C#
  • Plugin Failing on D365 v9 Online when I just have tracers to test execution
  • ASP.NET MVC Deleting row from one table after copying it to another table
  • Error VSSDK1001: Unable to find Microsoft.VisualStudio.CommandTable.VSCTCompiler type
  • Trying to fetch a string from another form but i get string value null
  • Entity Framework equivalent of the following query?
  • How do I get projection of one list to another with Linq?
  • I am using Alpha Vantage API to try and pull daily stock info. I am really new to using APIs and don't know what I am do
  • Get column names and types out of XMLSchema
  • Unable to read large log file with MemoryMappedViewStream
  • looping through file to add to datagridview
  • C# How do I ask for Admin, without "forcing" him
  • System.ComponentModel.Win32Exception: "The system cannot find the file specified"
  • How to add list to SQL query?
  • Visitor pattern: Number arithmetics based on input
  • How to remove a single DataLabel from a Chart made with EPPlus and C#
  • GameObjects will not load after game Restarts
  • Getting all dates between two dates using datepickers and Entity Framework 6
  • What should TResult be when using public async Task to return json response from API HTTP Post
  • Automapper Sub Property Mapping
  • reading a json file exception "Unhandled Exception: System.TypeInitializationException: The type initializer for &q
  • How to get MacOS username in .NET Core console app?
  • How can I extract the first word of every line of a text file in C#
  • HttpClient isn't using Client Certificate for Mutual TLS Auth
  • How do I make a generic dictionary for multiple types implementing the same interface?
  • C# Form add controls on runtime
  • C# - program about while loop
  • Accessing variables in other Windows Form class C#
  • How to display tooltip / context menu from Run object in (wpf) RichTextBox
  • How to get a 0 before a datetime day when the day is below 10 in C#
  • Nothing shows when I tried to fill Combobox with .csv filenames
  • RSA Crypto: Is it require to store keypair after geneating first time
  • potential problems with c# with windows 7 due to .net versions
  • ASP.NET Core 2.1 RedirectToAction appends TempData to url
  • Random Number Generator using C#
  • Mixing MockVerify and FluentAssertions.Should() in C#
  • IdentityServer4 and Web Api in one project fails to authenticate
  • WebApi Core project debug is hanging on await client.GetAsync
  • Why can't I load System.Security.Cryptography.ProtectedData when it's on the same directory as the executable
  • Regular expression repeated sequence of characters
  • How to check all checkbox by pressing one?
  • Is it possible to use Plotly.js in a C# Winforms WebBrowser component?
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org