استفاده از متد async در foreach

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class Example1
{
    public static async Task Main()
    {
        var data = new List<MyClass>
        {
            new()
            {
                Id = 1,
                Title = "ali"
            },
            new()
            {
                Id = 2,
                Title = "mohammad"
            }
        };

        try
        {
            data.ForEach(a => SendData(a, 1, 5));
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        try
        {
            data.ForEach(async a => await SendData(a, 2, 5));
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        foreach (var item in data)
        {
            try
            {
                await SendData(item, 3, 5);
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        try
        {
            data.ForEach(a => SendData(a, 4, 5));
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
    }

    private static async Task SendData(MyClass input, int witchInput, int delay)
    {
        Console.WriteLine($"SendData start, Id = {input.Id}, Witch = {witchInput}");

        await Task.Delay(delay);

        Console.WriteLine($"SendData finish, Id = {input.Id}, Witch = {witchInput}");

        throw new Exception($"ex throw Id = {input.Id}, Witch = {witchInput}");
    }
}

public class MyClass
{
    public int Id { get; set; }
    public string Title { get; set; }
}

SendData start, Id = 1, Witch = 1
SendData start, Id = 2, Witch = 1
SendData start, Id = 1, Witch = 2
SendData start, Id = 2, Witch = 2
SendData start, Id = 1, Witch = 3
SendData finish, Id = 1, Witch = 2
SendData finish, Id = 2, Witch = 2
SendData finish, Id = 1, Witch = 3
SendData finish, Id = 1, Witch = 1
SendData finish, Id = 2, Witch = 1
Unhandled exception. Unhandled exception. System.Exception: ex throw Id = 1, Witch = 3
   at Example1.SendData(MyClass input, Int32 witchInput, Int32 delay) in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 85
   at Example1.Main() in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 59
SendData start, Id = 2, Witch = 3
System.Exception: ex throw Id = 1, Witch = 2
   at Example1.SendData(MyClass input, Int32 witchInput, Int32 delay) in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 85
   at Example1.<>c.<<Main>b__0_1>d.MoveNext() in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 48
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__127_1(Object state)
   at System.Threading.QueueUserWorkItemCallbackDefaultContext.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()
System.Exception: ex throw Id = 2, Witch = 2
   at Example1.SendData(MyClass input, Int32 witchInput, Int32 delay) in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 85
   at Example1.<>c.<<Main>b__0_1>d.MoveNext() in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 48
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__127_1(Object state)
   at System.Threading.QueueUserWorkItemCallbackDefaultContext.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()
SendData finish, Id = 2, Witch = 3
System.Exception: ex throw Id = 2, Witch = 3
   at Example1.SendData(MyClass input, Int32 witchInput, Int32 delay) in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 85
   at Example1.Main() in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 59
SendData start, Id = 1, Witch = 4
SendData start, Id = 2, Witch = 4

Process finished with exit code 0.

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class Example1
{
    public static async Task Main()
    {
        var data = new List<MyClass>
        {
            new()
            {
                Id = 1,
                Title = "ali"
            },
            new()
            {
                Id = 2,
                Title = "mohammad"
            }
        };

        try
        {
            data.ForEach(a => SendData(a, 1, 5));
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        foreach (var item in data)
        {
            try
            {
                await SendData(item, 3, 5);
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }
        
        try
        {
            data.ForEach(async a => await SendData(a, 2, 5));
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        try
        {
            data.ForEach(a => SendData(a, 4, 5));
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
    }

    private static async Task SendData(MyClass input, int witchInput, int delay)
    {
        Console.WriteLine($"SendData start, Id = {input.Id}, Witch = {witchInput}");

        await Task.Delay(delay);

        Console.WriteLine($"SendData finish, Id = {input.Id}, Witch = {witchInput}");

        throw new Exception($"ex throw Id = {input.Id}, Witch = {witchInput}");
    }
}

public class MyClass
{
    public int Id { get; set; }
    public string Title { get; set; }
}

SendData start, Id = 1, Witch = 1
SendData start, Id = 2, Witch = 1
SendData start, Id = 1, Witch = 3
SendData finish, Id = 2, Witch = 1
SendData finish, Id = 1, Witch = 3
System.Exception: ex throw Id = 1, Witch = 3
   at Example1.SendData(MyClass input, Int32 witchInput, Int32 delay) in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 85
   at Example1.Main() in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 50
SendData start, Id = 2, Witch = 3
SendData finish, Id = 1, Witch = 1
SendData finish, Id = 2, Witch = 3
System.Exception: ex throw Id = 2, Witch = 3
   at Example1.SendData(MyClass input, Int32 witchInput, Int32 delay) in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 85
   at Example1.Main() in D:\Local\ConsoleApp2\ConsoleApp2\Program1.cs:line 50
SendData start, Id = 1, Witch = 2
SendData start, Id = 2, Witch = 2
SendData start, Id = 1, Witch = 4
SendData start, Id = 2, Witch = 4

Process finished with exit code 0.

data.ForEach(async a => await SendData(a, 2, 5));