int[] ArrayItems = { 1, 5, 8, 13, 35, 67 };
Random rand = new Random();
int choiceIdx = 0;


while(ArrayItems.Length > 0)
{
    choiceIdx = rand.Next(0, ArrayItems.Length);

    Console.WriteLine($"Output: {ArrayItems[choiceIdx]}");

    List<int> ArrayItemsList = new List<int>();
    ArrayItemsList.AddRange(ArrayItems);
    ArrayItemsList.Remove(ArrayItems[choiceIdx]);
    ArrayItems = ArrayItemsList.ToArray();
}

int[] ArrayItems = { 1, 5, 8, 13, 35, 67 };

Random rand = new Random();

while(ArrayItems.Length > 0)
{

    ...

}

choiceIdx = rand.Next(0, ArrayItems.Length);
Console.WriteLine($"Output: {ArrayItems[choiceIdx]}");

List<int> ArrayItemsList = new List<int>();
ArrayItemsList.AddRange(ArrayItems);
ArrayItemsList.Remove(ArrayItems[choiceIdx]);
ArrayItems = ArrayItemsList.ToArray();

GetAttribute("href")

using System;

using AngleSharp;
using AngleSharp.Html.Parser;
using System.Net;
using System.Threading.Tasks;


static void Main(string[] args)
{
    Console.WriteLine("Hello World!");
    Task t =  WebscrapingSample();
}


static async Task WebscrapingSample()
{

    var urlstring = "https://usefuledge.com";

    WebClient wc = new WebClient();
    try
    {
        string htmldocs = wc.DownloadString(urlstring);
        

        var config = Configuration.Default;
        var context = BrowsingContext.New(config);
        var document = await context.OpenAsync(req => req.Content(htmldocs));

        foreach ( var item in document.QuerySelectorAll("a"))
        {
            Console.WriteLine(item.TextContent.Trim() + " " + item.GetAttribute("href"));
        }


    }
    catch (System.Exception)
    {
        throw;
    }
}

foreach ( var item in document.QuerySelectorAll("a"))
{
    Console.WriteLine(item.TextContent.Trim() + " " + item.GetAttribute("href"));
}

foreach ( var item in document.QuerySelectorAll("a"))
{
    ...
}

Console.WriteLine(item.TextContent.Trim() + " " + item.GetAttribute("href"));

//using System.Net.NetworkInformation;
//using System.Net;

    int portNo = 8080;

    IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
    IPEndPoint[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpListeners();

    foreach (IPEndPoint endpoint in tcpConnInfoArray)
    {
        if (endpoint.Port == portNo)
        {
            //ポート使用中
        }
    }

//using System.Net.NetworkInformation;
//using System.Net;

    IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
    IPEndPoint[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpListeners();

    foreach (IPEndPoint endpoint in tcpConnInfoArray)
    {
        Console.WriteLine($"{endpoint.Address}:{endpoint.Port}");
    }

//using System.Net.NetworkInformation;
//using System.Net;

    IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
    IPEndPoint[] tcpConnInfoArray = ipGlobalProperties.GetActiveUdpListeners();

    foreach (IPEndPoint endpoint in tcpConnInfoArray)
    {
        Console.WriteLine($"{endpoint.Address}:{endpoint.Port}");
    }

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>();
        });

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>()
            .UseUrls("http://localhost:10111");
        });

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>()
            .UseUrls(new string[] {"http://localhost:10111", "https://localhost:10112"});
        });

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>()
            .UseUrls(new string[] {"http://192.168.2.112:10111", "https://192.168.2.112:10112"});
        });

class Data {
    public int id {get; set;}
    public string name {get; set;}
    public string dept { get; set;}
}

static void JsonSer()
{
    Data data = new Data();

    data.id = 1;
    data.name = "john";
    data.dept = "Purchase";

    string jsonStr = JsonSerializer.Serialize(data);
    Console.WriteLine(jsonStr);

}

Data data = new Data();

data.id = 1;
data.name = "john";
data.dept = "Purchase";

string jsonStr = JsonSerializer.Serialize(data);

static void JsonSerArray()
{
    Data[] data = new Data[3];

    data[0] = new Data();
    data[0].id = 1;
    data[0].name = "john";
    data[0].dept = "Purchase";

    data[1] = new Data();
    data[1].id = 2;
    data[1].name = "Mickey";
    data[1].dept = "Sales";

    data[2] = new Data();
    data[2].id = 3;
    data[2].name = "Donald";
    data[2].dept = "Planning";

    string jsonStr = JsonSerializer.Serialize(data);
    Console.WriteLine(jsonStr);

}

static void readJson()
{

    string jsonStr = ReadAllLine("jsonStr.json", "utf-8");

    Data jsonData = new Data();
    jsonData = JsonSerializer.Deserialize<Data>(jsonStr);

    Console.WriteLine($"jsonData.id = {jsonData.id}");
    Console.WriteLine($"jsonData.name = {jsonData.name}");
    Console.WriteLine($"jsonData.dept = {jsonData.dept}");

}

public static string ReadAllLine(string filePath, string encodingName)
{
    StreamReader sr = new StreamReader(filePath, Encoding.GetEncoding(encodingName));
    string allLine = sr.ReadToEnd();
    sr.Close();

    return allLine;
}

jsonData = JsonSerializer.Deserialize<Data>(jsonStr);

static void readJsonArray()
{

    string jsonStr = ReadAllLine("jsonStrArray.json", "utf-8");
    Console.WriteLine(jsonStr);

    Data[] jsonData = new Data[3];
    jsonData = JsonSerializer.Deserialize<Data[]>(jsonStr);

    foreach(Data item in jsonData)
    {
        Console.WriteLine($"jsonData.id = {item.id}");
        Console.WriteLine($"jsonData.name = {item.name}");
        Console.WriteLine($"jsonData.dept = {item.dept}");
    }

}

Data[] jsonData = new Data[3];

jsonData = JsonSerializer.Deserialize<Data[]>(jsonStr);

using System;
using System.Text.Json;
using System.IO;
using System.Text;


namespace csjson
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            readJsonArray();
        }

        class Data {
            public int id {get; set;}
            public string name {get; set;}
            public string dept { get; set;}
        }

        static void JsonSer()
        {
            Data data = new Data();

            data.id = 1;
            data.name = "john";
            data.dept = "Purchase";

            string jsonStr = JsonSerializer.Serialize(data);
            Console.WriteLine(jsonStr);
            writeFile("utf-8", "jsonStr.json", jsonStr);

        }

        static void JsonSerArray()
        {
            Data[] data = new Data[3];

            data[0] = new Data();
            data[0].id = 1;
            data[0].name = "john";
            data[0].dept = "Purchase";

            data[1] = new Data();
            data[1].id = 2;
            data[1].name = "Mickey";
            data[1].dept = "Sales";

            data[2] = new Data();
            data[2].id = 3;
            data[2].name = "Donald";
            data[2].dept = "Planning";

            string jsonStr = JsonSerializer.Serialize(data);
            Console.WriteLine(jsonStr);
            writeFile("utf-8", "jsonStrArray.json", jsonStr);

        }

        static void readJson()
        {

            string jsonStr = ReadAllLine("jsonStr.json", "utf-8");
            Console.WriteLine(jsonStr);

            Data jsonData = new Data();
            jsonData = JsonSerializer.Deserialize<Data>(jsonStr);

            Console.WriteLine($"jsonData.id = {jsonData.id}");
            Console.WriteLine($"jsonData.name = {jsonData.name}");
            Console.WriteLine($"jsonData.dept = {jsonData.dept}");

        }



        static void readJsonArray()
        {

            string jsonStr = ReadAllLine("jsonStrArray.json", "utf-8");
            Console.WriteLine(jsonStr);

            Data[] jsonData = new Data[3];
            jsonData = JsonSerializer.Deserialize<Data[]>(jsonStr);

            foreach(Data item in jsonData)
            {
                Console.WriteLine($"jsonData.id = {item.id}");
                Console.WriteLine($"jsonData.name = {item.name}");
                Console.WriteLine($"jsonData.dept = {item.dept}");
            }

        }





        public static void writeFile(string encodingName, string filePath, string writeText)
        {

            Encoding encoding = Encoding.GetEncoding(encodingName);
            StreamWriter writer = new StreamWriter(filePath, false, encoding);
            writer.WriteLine(writeText);

            writer.Close();

        }

        public static string ReadAllLine(string filePath, string encodingName)
        {
            StreamReader sr = new StreamReader(filePath, Encoding.GetEncoding(encodingName));
            string allLine = sr.ReadToEnd();
            sr.Close();

            return allLine;
        }


    }
}

[JSInvokable]
public static void JSInvokableFunc1()
{
    Console.WriteLine("JSInvokableFunc1 called");
}

[JSInvokable]
public static void CallBlazorFuncWithParam(string param1)
{
    Console.WriteLine($"CallBlazorFuncWithParam called : {param1}");
}

[JSInvokable]
public static string CallBlazorFuncRetValue()
{
    Console.WriteLine("CallBlazorFuncRetValue");
    return "CallBlazorFuncRetValue";
}

@page "/fromJS"

<h1>From JavaScript Function</h1>

<button onclick="CallBlazorFunc()">CallBlazorFunc</button>

<hr>

<input type="text" placeholder="param1" id="param1"/>
<button onclick="CallBlazorFuncWithParam()">CallBlazorFuncWithParam</button>

<hr>

<button onclick="CallBlazorFuncRetValue()">CallBlazorFuncRetValue</button>



@code {

    [JSInvokable]
    public static void JSInvokableFunc1()
    {
        Console.WriteLine("JSInvokableFunc1 called");
    }

    [JSInvokable]
    public static void CallBlazorFuncWithParam(string param1)
    {
        Console.WriteLine($"CallBlazorFuncWithParam called : {param1}");
    }

    [JSInvokable]
    public static string CallBlazorFuncRetValue()
    {
        Console.WriteLine("CallBlazorFuncRetValue");
        return "CallBlazorFuncRetValue";

    }
}