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SqlDataReader DB_reader = Comm_String.ExecuteReader(); DataTable DT = new DataTable(); DataRow relation; while (await DB_reader.ReadAsync()) { relation = DT.NewRow(); if (i == 1) { for (int k = 0; k

// 1. 연결된 ttyUSB Path 확인 usb 1-1.2 // usb 1-1.4 pi@Teon:~ $ dmesg | grep ttyUSB // 2. usb-serial rules 수정 pi@Teon:~ $ sudo nano /etc/udev/rules.d/10-usb-serial.rules SUBSYSTEM=="tty", ATTRS{idProduct}=="6001", ATTRS{idVendor}=="0403", ATTRS{devpath}=="1.2", SYMLINK+="ttyUSBa" SUBSYSTEM=="tty", ATTRS{idProduct}=="6001", ATTRS{idVendor}=="0403", ATTRS{devpath}=="1.4", SYMLINK+="ttyUSBb" // 3. 저장내용..

udevadm info /dev/ttyUSB0

sudo nano /etc/sdg/lxsession/LXDE-pi/autostart

해결방안: build 디렉토리로 이동하라. >> cd MyMauiApp >> dotnet build -t:Run -f net6.0-maccatalyst https://docs.microsoft.com/ko-kr/dotnet/maui/macos/cli

Visual studio for mac 2022 에서 Maui 프로젝트 만든후 빌드할 때 오류가 있어 아래와 같이 해결하였다. Visual studio for mac 2022 terminal : ~% dotnet workload install android Error: Inadequate permissions. Run the command with elevated privileges 해결>> sudo -i ~% dotnet workload install android Error: Workload ID privileges is not recognized. 해결>> dotnet workload install maui-android maui-ios Successfully installed workload(s)..

MSSQL HashBytes Sqlparameter Type Error Parameter Type Varchar != Nvarchar HashBytes different binary value -->> Sovled 1. var _pWDs = new SqlParameter("@PWDs", SqlDbType.VarChar,500); _pWDs.Value = Ubody.PWD2; // Query String comm.CommandText += " select * from UidTable where password = Hashbyte('SHA2_256',@PWDs); comm.Parameters.Add(_pWDs); Solved 2. comm.CommandText += " select * from UidTabl..

.Net 5 Api return value list all same value Error public class Rca { public string A{ get; set; } public string B{ get; set; } } public List rList() { List RTN = new List(); Rca _RTN = new Rca(); for(int i = 0; i < 10; i++) { _RTN.A = "a" +i.ToString(); _RTN.B = "b" +i.ToString(); RTN.Add(_RTN); } return RTN; } _________________________________ PostMan result: { "A": "a9", "B": "b9", }, { "A": "..

serial.DataReceived 이벤트는 주 스레드가 아닌 보조 스레드에서 발생 UI요소인 Binding 된 TextBox의 Text를 변경하려 하면 Thread Exception 오류가 발생한다. UI ViewModel private string? _rF_IDS; public string? RF_IDS { get { return _rF_IDS; } set { _rF_IDS = value; OnPropertyChanged(nameof(RF_IDS)); } } public HomeViewModel() { RFConnectCommand = new RFConnectCommand(this); } Command private readonly HomeViewModel _viewModel; public RFCon..

public MainWindow() { InitializeComponent(); txtUsername.Text = Properties.Settings.Default._TextBox; radio_1.IsChecked = (Nullable)Properties.Settings.Default._RadioButton1 is null ? false: Properties.Settings.Default._RadioButton1; radio_2.IsChecked = (Nullable)Properties.Settings.Default._RadioButton2 is null ? false : Properties.Settings.Default._RadioButton2; } 속성> 설정> 일반