rallez Posts - Answer Overflow

rallez

•Created by rallez on 2/26/2024 in #help

Avalonia UI Unable to find suitable setter or adder for property Styles

Hey im starting with Avlonia UI. (BTW give your thought sif should I go for it or something else?). My really simple program doesn't comiple for reason:

Error AVLN:0004 Avalonia: Unable to find suitable setter or adder for property Styles of type Avalonia.Base:Avalonia.StyledElement for argument System.Runtime:System.Object, available setter parameter lists are:
Avalonia.Styling.IStyle
Avalonia.Styling.IStyle Line 23, position 57.

Error AVLN:0004 Avalonia: Unable to find suitable setter or adder for property Styles of type Avalonia.Base:Avalonia.StyledElement for argument System.Runtime:System.Object, available setter parameter lists are:
Avalonia.Styling.IStyle
Avalonia.Styling.IStyle Line 23, position 57.

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        Width="400"
        Height="600"
        CanResize="False"
        WindowStartupLocation="CenterScreen"
        WindowState="Normal"
        Background="#0D1B2A"
        x:Class="Calculator.MainWindow"
        Title="Calculator"
        ExtendClientAreaToDecorationsHint="True"
        ExtendClientAreaTitleBarHeightHint="-1"
        ExtendClientAreaChromeHints="NoChrome"
        PointerPressed="DragMove">
    
    <Grid ShowGridLines="True" RowDefinitions="1.5*,3*,15*">

        <Grid Grid.Row="0" ColumnDefinitions="*, Auto, 50">
            <TextBlock Grid.Column="0" Text="Calculator" />
            <Button Grid.Column="2" Click="CloseWindow" Styles="{StaticResource CloseButtonStyle}"/>


        </Grid>

        <Grid Grid.Row="1" />

        <Grid Grid.Row="2" />

    </Grid>

</Window>

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        Width="400"
        Height="600"
        CanResize="False"
        WindowStartupLocation="CenterScreen"
        WindowState="Normal"
        Background="#0D1B2A"
        x:Class="Calculator.MainWindow"
        Title="Calculator"
        ExtendClientAreaToDecorationsHint="True"
        ExtendClientAreaTitleBarHeightHint="-1"
        ExtendClientAreaChromeHints="NoChrome"
        PointerPressed="DragMove">
    
    <Grid ShowGridLines="True" RowDefinitions="1.5*,3*,15*">

        <Grid Grid.Row="0" ColumnDefinitions="*, Auto, 50">
            <TextBlock Grid.Column="0" Text="Calculator" />
            <Button Grid.Column="2" Click="CloseWindow" Styles="{StaticResource CloseButtonStyle}"/>


        </Grid>

        <Grid Grid.Row="1" />

        <Grid Grid.Row="2" />

    </Grid>

</Window>

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Design.PreviewWith>
        <Border Padding="20">
        </Border>
    </Design.PreviewWith>

    <Style x:Key="CloseButtonStyle" Selector="Button">
        <Setter Property="Background" Value="#E6E8E6"/>
    </Style>

</Styles>

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Design.PreviewWith>
        <Border Padding="20">
        </Border>
    </Design.PreviewWith>

    <Style x:Key="CloseButtonStyle" Selector="Button">
        <Setter Property="Background" Value="#E6E8E6"/>
    </Style>

</Styles>

5 replies

CC#

•Created by rallez on 7/1/2023 in #help

✅ Basic http client get request

Hi why my code won't return any value

static async Task<int> GetServerTime()
{
    using (HttpClient client = new HttpClient())
    {
        try
        {
            HttpResponseMessage response = await client.GetAsync("http://XXX/");
            response.EnsureSuccessStatusCode();

            string result = await response.Content.ReadAsStringAsync();
            int serverTime = int.Parse(result);
            return serverTime;
        }
        catch (HttpRequestException ex)
        {
            Console.WriteLine("Błąd: " + ex.Message);
            throw;
        }
    }
}

async void Test()
{
    Console.WriteLine(await GetServerTime());
}

Test();

static async Task<int> GetServerTime()
{
    using (HttpClient client = new HttpClient())
    {
        try
        {
            HttpResponseMessage response = await client.GetAsync("http://XXX/");
            response.EnsureSuccessStatusCode();

            string result = await response.Content.ReadAsStringAsync();
            int serverTime = int.Parse(result);
            return serverTime;
        }
        catch (HttpRequestException ex)
        {
            Console.WriteLine("Błąd: " + ex.Message);
            throw;
        }
    }
}

async void Test()
{
    Console.WriteLine(await GetServerTime());
}

Test();

When i dont use Test method instead just using

Console.WriteLine(await GetServerTime());

Console.WriteLine(await GetServerTime());

it works normally

33 replies

CC#

•Created by rallez on 6/10/2023 in #help

print out all pairs of natural numbers whose sum isequal to the entered number n

Write an algorithm that prints out all pairs of natural numbers whose sum is equal to the entered number n. Example: n = 7 Paris: 0 + 7 1 + 6 2 + 5 3 + 4 I have no clue how to introduce it into c# lang

34 replies

CC#

•Created by rallez on 2/13/2023 in #help

✅ Give object default values (destroy?)

Hi I have a program which after sign in assignes object user some values. While sign out i need to delete/destroy or set as default those vaules.

public class User
{
    public int UserId { get; set; }
    public string Username { get; set; }
    public List<Character> Characters { get; set; }

    public User(string username, int userid)
    {
        Username = username;
        UserId = userid;
        Characters = new List<Character>();
    }

    ~User()
    {
        Username = "";
        UserId = default;
        Characters = new List<Character>();;
    }
}

public class User
{
    public int UserId { get; set; }
    public string Username { get; set; }
    public List<Character> Characters { get; set; }

    public User(string username, int userid)
    {
        Username = username;
        UserId = userid;
        Characters = new List<Character>();
    }

    ~User()
    {
        Username = "";
        UserId = default;
        Characters = new List<Character>();;
    }
}

I've heard about deconstructor but i dont know how to use them to be honest. Please help me

22 replies

CC#

•Created by rallez on 2/9/2023 in #help

Unable to connect to SQL

using System.Data.SqlClient;
Console.WriteLine("Database connector");
string connectionString = "Data Source=localhost,3306;Initial Catalog=testcon;User id=root;Password=~'!(J+P1W%YYM-0q9y~H;";
SqlConnection cnn;
cnn = new SqlConnection(connectionString);

try
{
    Console.WriteLine("Connecting...");
    cnn.Open();
    Console.WriteLine("Connected!");

}
catch(SqlException)
{
    Console.WriteLine("Unable to connect to database!");
}
finally
{
    cnn.Close();
}


Console.ReadLine();

using System.Data.SqlClient;
Console.WriteLine("Database connector");
string connectionString = "Data Source=localhost,3306;Initial Catalog=testcon;User id=root;Password=~'!(J+P1W%YYM-0q9y~H;";
SqlConnection cnn;
cnn = new SqlConnection(connectionString);

try
{
    Console.WriteLine("Connecting...");
    cnn.Open();
    Console.WriteLine("Connected!");

}
catch(SqlException)
{
    Console.WriteLine("Unable to connect to database!");
}
finally
{
    cnn.Close();
}


Console.ReadLine();

13 replies

CC#

•Created by rallez on 2/8/2023 in #help

Generate random array and quicksort algorithm

Want to make a program that contains functions that generates random array, prints it and sorts it.

void GenArray(int[] myArray, int size, int minSize, int maxSize)
{
    Random random = new Random((int)DateTime.Now.Ticks);
    for (int i = 0; i < size; i++)
    {
        myArray[i] = random.Next(minSize, maxSize + 1);
    }
}

void PrintArray(int[] myArray, int size)
{
    for (int i = 0; i < size; i++)
    {
        Console.WriteLine("[" + i + "] " + myArray[i]);
    }
}

int Partition(int[] myArray, int l, int r)
{
    int pivot = myArray[l];
    int count = 0;

    for(int i = l + 1; i <= r; i++)
    {
        if(myArray[i] <= pivot)
        {
            count++;
        }
    }

    int pivotIndex = l + count;
    (myArray[pivotIndex], myArray[l]) = (myArray[l], myArray[pivotIndex]);

    int i2 = l, j = r;
    while(i2 < pivotIndex && j > pivotIndex)
    {
        while(myArray[i2] <= pivot)
        {
            i2++;
        }

        while(myArray[j] > pivot)
        {
            j--;
        }

        if(i2 < pivotIndex && j > pivotIndex)
        {
            (myArray[i2++], myArray[j--]) = (myArray[j--], myArray[i2++]);
        }
    }

    return pivotIndex;
}

void QuickSort(int[] myArray, int l, int r)
{
    if (l >= r)
    {
        return;
    }
    int p = Partition(myArray, l, r);
    QuickSort(myArray, l, p - 1);
    QuickSort(myArray, p + 1, r);
}
Console.Write("Provide size of array: ");
int size = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Provide range of array: ");
Console.Write("From: ");
int minSize = Convert.ToInt32(Console.ReadLine());

Console.Write("To: ");
int maxSize = Convert.ToInt32(Console.ReadLine());

int[] tab1 = new int[size];

Console.WriteLine("");
Console.WriteLine("Unsorted array: ");
GenArray(tab1, size, minSize, maxSize);
PrintArray(tab1, size);

Console.WriteLine("");
Console.WriteLine("Sorted array: ");
QuickSort(tab1, 0, size - 1);
PrintArray(tab1, size);

Console.ReadLine();

void GenArray(int[] myArray, int size, int minSize, int maxSize)
{
    Random random = new Random((int)DateTime.Now.Ticks);
    for (int i = 0; i < size; i++)
    {
        myArray[i] = random.Next(minSize, maxSize + 1);
    }
}

void PrintArray(int[] myArray, int size)
{
    for (int i = 0; i < size; i++)
    {
        Console.WriteLine("[" + i + "] " + myArray[i]);
    }
}

int Partition(int[] myArray, int l, int r)
{
    int pivot = myArray[l];
    int count = 0;

    for(int i = l + 1; i <= r; i++)
    {
        if(myArray[i] <= pivot)
        {
            count++;
        }
    }

    int pivotIndex = l + count;
    (myArray[pivotIndex], myArray[l]) = (myArray[l], myArray[pivotIndex]);

    int i2 = l, j = r;
    while(i2 < pivotIndex && j > pivotIndex)
    {
        while(myArray[i2] <= pivot)
        {
            i2++;
        }

        while(myArray[j] > pivot)
        {
            j--;
        }

        if(i2 < pivotIndex && j > pivotIndex)
        {
            (myArray[i2++], myArray[j--]) = (myArray[j--], myArray[i2++]);
        }
    }

    return pivotIndex;
}

void QuickSort(int[] myArray, int l, int r)
{
    if (l >= r)
    {
        return;
    }
    int p = Partition(myArray, l, r);
    QuickSort(myArray, l, p - 1);
    QuickSort(myArray, p + 1, r);
}
Console.Write("Provide size of array: ");
int size = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Provide range of array: ");
Console.Write("From: ");
int minSize = Convert.ToInt32(Console.ReadLine());

Console.Write("To: ");
int maxSize = Convert.ToInt32(Console.ReadLine());

int[] tab1 = new int[size];

Console.WriteLine("");
Console.WriteLine("Unsorted array: ");
GenArray(tab1, size, minSize, maxSize);
PrintArray(tab1, size);

Console.WriteLine("");
Console.WriteLine("Sorted array: ");
QuickSort(tab1, 0, size - 1);
PrintArray(tab1, size);

Console.ReadLine();

7 replies

CC#

•Created by rallez on 2/8/2023 in #help

Function that swap two numbers

Hi i need a function that swap 2 numbers I have written code below but it seems to doesn't work. Where am I wrong?

(int, int) Swap(int first, int second)
{
    int temp = first;
    first = second;
    second = temp;
    return (first, second);
}

int a = 5;
int b = 10;

Console.WriteLine(a);
Console.WriteLine(b);
Swap(a, b);
Console.WriteLine(a);
Console.WriteLine(b);

(int, int) Swap(int first, int second)
{
    int temp = first;
    first = second;
    second = temp;
    return (first, second);
}

int a = 5;
int b = 10;

Console.WriteLine(a);
Console.WriteLine(b);
Swap(a, b);
Console.WriteLine(a);
Console.WriteLine(b);

18 replies

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