i like chatgpt Posts - Answer Overflow

i like chatgpt

•Created by i like chatgpt on 2/15/2024 in #help

✅ Where does BenchmarkDotNet save my files?

I can run the following successfully but I cannot find where the files A.txt and B.txt are saved. Where are they saved?

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

BenchmarkRunner.Run<MyBenchmark>();


[MemoryDiagnoser]
public class MyBenchmark
{
    Guid Id = Guid.NewGuid();

    StreamWriter writerA = null!;
    StreamWriter writerB = null!;

    [GlobalSetup]
    public void GlobalSetup()
    {
        writerA = new("A.txt");
        writerB = new("B.txt");
    }

    [GlobalCleanup]
    public void GlobalCleanup()
    {
        writerA?.Dispose();
        writerB?.Dispose();
    }

    [Benchmark]
    public async Task A() => await writerA.WriteLineAsync(Id.ToString());

    [Benchmark]
    public async Task B() => await writerB.WriteLineAsync(Id.ToString());
}

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

BenchmarkRunner.Run<MyBenchmark>();


[MemoryDiagnoser]
public class MyBenchmark
{
    Guid Id = Guid.NewGuid();

    StreamWriter writerA = null!;
    StreamWriter writerB = null!;

    [GlobalSetup]
    public void GlobalSetup()
    {
        writerA = new("A.txt");
        writerB = new("B.txt");
    }

    [GlobalCleanup]
    public void GlobalCleanup()
    {
        writerA?.Dispose();
        writerB?.Dispose();
    }

    [Benchmark]
    public async Task A() => await writerA.WriteLineAsync(Id.ToString());

    [Benchmark]
    public async Task B() => await writerB.WriteLineAsync(Id.ToString());
}

8 replies

CC#

•Created by i like chatgpt on 2/15/2024 in #help

✅ Why does Console.WindowWidth produce Invalid Handle when the app is invoked from Process?

I have two console application projects: HelloWorld and Invoker. HelloWorld

try
{
    Console.Out.WriteLine(new string('=', Console.WindowWidth));
}
catch (Exception e)
{
    Console.Error.WriteLine($"HelloWorld's error: {e.Message}");
}

try
{
    Console.Out.WriteLine(new string('=', Console.WindowWidth));
}
catch (Exception e)
{
    Console.Error.WriteLine($"HelloWorld's error: {e.Message}");
}

It works fine when executed directly. Invoker

ProcessStartInfo info = new()
{
    FileName = "helloworld.exe",
    RedirectStandardOutput = true,
    RedirectStandardError = true,
};

using var process = new Process { StartInfo = info };
process.Start();

Task? outputTask = null;

if (!info.UseShellExecute && info.RedirectStandardError)
{
    var errorWriter = process.StandardError;
    Console.WriteLine($"Error: {errorWriter.ReadToEnd()}");
}

if(outputTask is not null) await outputTask;
await process.WaitForExitAsync();

ProcessStartInfo info = new()
{
    FileName = "helloworld.exe",
    RedirectStandardOutput = true,
    RedirectStandardError = true,
};

using var process = new Process { StartInfo = info };
process.Start();

Task? outputTask = null;

if (!info.UseShellExecute && info.RedirectStandardError)
{
    var errorWriter = process.StandardError;
    Console.WriteLine($"Error: {errorWriter.ReadToEnd()}");
}

if(outputTask is not null) await outputTask;
await process.WaitForExitAsync();

It produces

Error: HelloWord's error: The handle is invalid.

What is wrong?

3 replies

CC#

•Created by i like chatgpt on 2/14/2024 in #help

✅ Does the value of CreateNoWindow matter when UseShellExectute=true?

ProcessStartInfo info = new()
{
    FileName = @"cmd",
    Arguments = @"actions.bat",
    CreateNoWindow = true, // either true or false it still creates a window
    UseShellExecute = true
};
using var process = new Process { StartInfo = info };
process.Start();

ProcessStartInfo info = new()
{
    FileName = @"cmd",
    Arguments = @"actions.bat",
    CreateNoWindow = true, // either true or false it still creates a window
    UseShellExecute = true
};
using var process = new Process { StartInfo = info };
process.Start();

3 replies

CC#

•Created by i like chatgpt on 2/6/2024 in #help

✅ Regex pattern to match unique words each with 3 unique characters

Given a multiline input text:

abc
aaaa
bcde
acd
abc
abc
xyz

abc
aaaa
bcde
acd
abc
abc
xyz

I am looking for a regex pattern that matches unique words each consists of exactly 3 unique characters. The expected output:

acd
xyz

acd
xyz

Edit: For new visitors, this question can actually be solved with negative lookbehind and negative lookahead. If you are in hurry, you can jump to https://discord.com/channels/143867839282020352/1204500978741673994/1204519081663926304 and return again to this message https://discord.com/channels/143867839282020352/1204500978741673994/1204500978741673994 in the future. I may update with the solution. 🙂

53 replies

CC#

•Created by i like chatgpt on 2/5/2024 in #help

✅ Why is an explicit cast needed even though the implicit cast operator is available?

No explicit cast is needed.

var (x, y) = GetPoint();
static (float re, float im) GetPoint() => (1, 0);

var (x, y) = GetPoint();
static (float re, float im) GetPoint() => (1, 0);

But why does the following need explicit cast even though an implicit conversion operator has been implemented?

//var (x, y) = new Complex(1, 0); <== Error!

var (x, y) = ((float, float))new Complex(1, 0);

class Complex(float re, float im)
{
    public float Re { get; set; } = re;
    public float Im { get; set; } = im;
    public static implicit operator (float re, float im)(Complex c) => (c.Re, c.Im);
}

//var (x, y) = new Complex(1, 0); <== Error!

var (x, y) = ((float, float))new Complex(1, 0);

class Complex(float re, float im)
{
    public float Re { get; set; } = re;
    public float Im { get; set; } = im;
    public static implicit operator (float re, float im)(Complex c) => (c.Re, c.Im);
}

7 replies

CC#

•Created by i like chatgpt on 2/5/2024 in #help

✅ Can my Equals(IEnumerable<T>? x, IEnumerable<T>? y) be made much simpler?

You may have any tricks to simplify the following.

public bool Equals(IEnumerable<T>? x, IEnumerable<T>? y)
{
    if (x is null) return y is null;
    if (y is null) return false;
    return x.SequenceEqual(y);
}

public bool Equals(IEnumerable<T>? x, IEnumerable<T>? y)
{
    if (x is null) return y is null;
    if (y is null) return false;
    return x.SequenceEqual(y);
}

6 replies

CC#

•Created by i like chatgpt on 2/4/2024 in #help

✅ How to group by tautology with LINQ?

IEnumerable<Row> rows =
[
    new Row(null, "_or_", null, null),
    new Row(null, "_or_", true, true),
    new Row(null, "_or_", false, null),
    new Row(true, "_or_", true, true),
    new Row(true, "_or_", false, true),
    new Row(false, "_or_", false, false),

    new Row(null, "or", null, null),
    new Row(null, "or", true, true),
    new Row(null, "or", false, null),
    new Row(true, "or", true, true),
    new Row(true, "or", false, true),
    new Row(false, "or", false, false),

    new Row(null, "xor", null, null),
    new Row(null, "xor", true, null),
    new Row(null, "xor", false, null),
    new Row(true, "xor", true, false),
    new Row(true, "xor", false, true),
    new Row(false, "xor", false, false),
    new Row(null, "xor_", null, null),
    new Row(null, "xor_", true, null),
    new Row(null, "xor_", false, null),
    new Row(true, "xor_", true, false),
    new Row(true, "xor_", false, true),
    new Row(false, "xor_", false, false)
];

IEnumerable<Row> rows =
[
    new Row(null, "_or_", null, null),
    new Row(null, "_or_", true, true),
    new Row(null, "_or_", false, null),
    new Row(true, "_or_", true, true),
    new Row(true, "_or_", false, true),
    new Row(false, "_or_", false, false),

    new Row(null, "or", null, null),
    new Row(null, "or", true, true),
    new Row(null, "or", false, null),
    new Row(true, "or", true, true),
    new Row(true, "or", false, true),
    new Row(false, "or", false, false),

    new Row(null, "xor", null, null),
    new Row(null, "xor", true, null),
    new Row(null, "xor", false, null),
    new Row(true, "xor", true, false),
    new Row(true, "xor", false, true),
    new Row(false, "xor", false, false),
    new Row(null, "xor_", null, null),
    new Row(null, "xor_", true, null),
    new Row(null, "xor_", false, null),
    new Row(true, "xor_", true, false),
    new Row(true, "xor_", false, true),
    new Row(false, "xor_", false, false)
];

22 replies

CC#

•Created by i like chatgpt on 2/4/2024 in #help

Can these ternary expression with expensive method calls be simplified without outline variables ...

I do NOT want to - call expensive methods more than once. - make "outline" temporary variables. Outline variables are ones declared outside ternary expressions. - leak variables with letters.

var out1 = ExpensiveMethod1(x, y) is bool __ ? __.ToString() : "null";
var out2 = ExpensiveMethod2(x, y) is bool ___ ? ___.ToString() : "null";
var out3 = ExpensiveMethod3(x, y) is bool ____ ? ____.ToString() : "null";

var out1 = ExpensiveMethod1(x, y) is bool __ ? __.ToString() : "null";
var out2 = ExpensiveMethod2(x, y) is bool ___ ? ___.ToString() : "null";
var out3 = ExpensiveMethod3(x, y) is bool ____ ? ____.ToString() : "null";

where bool? ExpensiveMethod*<T,U>(T t, U u){}. Can these expression be simplified even further?

10 replies

CC#

•Created by i like chatgpt on 1/30/2024 in #help

When do we need to use static test method?

Consider the following test class.

public class MyTest
{
    [Fact]
    public static void Test_1() => Assert.True(true);
    [Fact]
    public void Test_2() => Assert.True(true);
}

public class MyTest
{
    [Fact]
    public static void Test_1() => Assert.True(true);
    [Fact]
    public void Test_2() => Assert.True(true);
}

Results:

Test Run Successful.
Total tests: 2
     Passed: 2
 Total time: 1.2190 Seconds

Test Run Successful.
Total tests: 2
     Passed: 2
 Total time: 1.2190 Seconds

Thus both static and instance test methods are invoked. From this results, I am wondering when we really need static test methods. I am not 100% sure with my opinion. Please correct me if I am wrong. Use static test methods to explicitly express our intent that the test methods don't want to use injected stuffs such as ITestOutputHelper because injected stuffs cannot be static. The chained constraints that prevent static methods from participating in DI: - Static methods can only access static members (other static methods, static fields, static properties, etc). - Static constructor must be parameterless so it cannot be injected. - Instance constructor cannot initialize static members.

2 replies

CC#

•Created by i like chatgpt on 1/27/2024 in #help

What is the proper names for the following mutating methods?

What is the most proper names to replace the name of Mutator_A and Mutator_B? The names - must be descriptive so we know what they do only by reading their names - must not be too long

static void Mutator_A(ref File file)
{
    file = new File { Id = Random.Shared.Next(), Name = Path.GetRandomFileName() };
}
static void Mutator_B(File file)
{
    file.Id = Random.Shared.Next();
    file.Name = Path.GetRandomFileName();
}
class File
{
    public int Id;
    public string Name = null!;
}

static void Mutator_A(ref File file)
{
    file = new File { Id = Random.Shared.Next(), Name = Path.GetRandomFileName() };
}
static void Mutator_B(File file)
{
    file.Id = Random.Shared.Next();
    file.Name = Path.GetRandomFileName();
}
class File
{
    public int Id;
    public string Name = null!;
}

30 replies

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