fix nullable

Unosquare.RaspberryIO/Camera/CameraColor.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Linq;
-
 using Swan;
 
 namespace Unosquare.RaspberryIO.Camera {

Unosquare.RaspberryIO/Camera/CameraController.cs

@@ -1,7 +1,9 @@
+#nullable enable
+
 using System;
 using System.IO;
 using System.Threading;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 
 using Swan;
 

Unosquare.RaspberryIO/Camera/CameraRect.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Globalization;
 
-using Swan;
+using Swan;
 
 namespace Unosquare.RaspberryIO.Camera {
   /// <summary>

Unosquare.RaspberryIO/Camera/CameraSettingsBase.cs

@@ -1,3 +1,5 @@
+#nullable enable
+
 using System;
 using System.Globalization;
 using System.Text;
@@ -298,8 +300,7 @@ namespace Unosquare.RaspberryIO.Camera {
       }
 
       if(this.ImageColorEffectU >= 0 && this.ImageColorEffectV >= 0) {
-        _ = sb.Append(
-            $" -cfx {this.ImageColorEffectU.Clamp(0, 255).ToString(Ci)}:{this.ImageColorEffectV.Clamp(0, 255).ToString(Ci)}");
+        _ = sb.Append($" -cfx {this.ImageColorEffectU.Clamp(0, 255).ToString(Ci)}:{this.ImageColorEffectV.Clamp(0, 255).ToString(Ci)}");
       }
 
       if(this.CaptureMeteringMode != CameraMeteringMode.Average) {
@@ -330,8 +331,7 @@ namespace Unosquare.RaspberryIO.Camera {
         _ = sb.Append($" -drc {this.CaptureDynamicRangeCompensation.ToString().ToLowerInvariant()}");
       }
 
-      if(this.CaptureWhiteBalanceControl == CameraWhiteBalanceMode.Off &&
-          (this.CaptureWhiteBalanceGainBlue != 0M || this.CaptureWhiteBalanceGainRed != 0M)) {
+      if(this.CaptureWhiteBalanceControl == CameraWhiteBalanceMode.Off && (this.CaptureWhiteBalanceGainBlue != 0M || this.CaptureWhiteBalanceGainRed != 0M)) {
         _ = sb.Append($" -awbg {this.CaptureWhiteBalanceGainBlue.ToString(Ci)},{this.CaptureWhiteBalanceGainRed.ToString(Ci)}");
       }
 

Unosquare.RaspberryIO/Camera/CameraVideoSettings.cs

@@ -63,7 +63,7 @@ namespace Unosquare.RaspberryIO.Camera {
     /// <summary>
     /// Specifies the path to save video files.
     /// </summary>
-    public String? VideoFileName {
+    public String VideoFileName {
       get; set;
     }
 

Unosquare.RaspberryIO/Camera/Enums.cs

@@ -1,6 +1,6 @@
-namespace Unosquare.RaspberryIO.Camera {
-  using System;
+using System;
 
+namespace Unosquare.RaspberryIO.Camera {
   /// <summary>
   /// Defines the available encoding formats for the Raspberry Pi camera module.
   /// </summary>

Unosquare.RaspberryIO/Computer/AudioState.cs

@@ -62,7 +62,8 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <returns>
     /// A <see cref="String" /> that represents the audio state.
     /// </returns>
-    public override String ToString() => "Device information: \n" +
+    public override String ToString() =>
+      "Device information: \n" +
       $">> Name: {this.ControlName}\n" +
       $">> Card number: {this.CardNumber}\n" +
       $">> Volume (%): {this.Level}%\n" +

Unosquare.RaspberryIO/Computer/DsiDisplay.cs

@@ -36,7 +36,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// The brightness.
     /// </value>
     public Byte Brightness {
-      get => this.IsPresent ? System.Byte.TryParse(File.ReadAllText(BrightnessFilename).Trim(), out Byte brightness) ? brightness : (Byte)0 : (Byte)0;
+      get => this.IsPresent ? Byte.TryParse(File.ReadAllText(BrightnessFilename).Trim(), out Byte brightness) ? brightness : (Byte)0 : (Byte)0;
       set {
         if(this.IsPresent) {
           File.WriteAllText(BrightnessFilename, value.ToString(CultureInfo.InvariantCulture));

Unosquare.RaspberryIO/Computer/NetworkAdapterInfo.cs

@@ -1,5 +1,5 @@
 using System;
-using System.Net;
+using System.Net;
 
 namespace Unosquare.RaspberryIO.Computer {
   /// <summary>
@@ -9,35 +9,35 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// Gets the name.
     /// </summary>
-    public String? Name {
+    public String Name {
       get; internal set;
     }
 
     /// <summary>
     /// Gets the IP V4 address.
     /// </summary>
-    public IPAddress? IPv4 {
+    public IPAddress IPv4 {
       get; internal set;
     }
 
     /// <summary>
     /// Gets the IP V6 address.
     /// </summary>
-    public IPAddress? IPv6 {
+    public IPAddress IPv6 {
       get; internal set;
     }
 
     /// <summary>
     /// Gets the name of the access point.
     /// </summary>
-    public String? AccessPointName {
+    public String AccessPointName {
       get; internal set;
     }
 
     /// <summary>
     /// Gets the MAC (Physical) address.
     /// </summary>
-    public String? MacAddress {
+    public String MacAddress {
       get; internal set;
     }
 

Unosquare.RaspberryIO/Computer/NetworkSettings.cs

@@ -34,10 +34,10 @@ namespace Unosquare.RaspberryIO.Computer {
     /// </summary>
     /// <param name="adapters">The adapters.</param>
     /// <returns>A list of WiFi networks.</returns>
-    public async Task<List<WirelessNetworkInfo>> RetrieveWirelessNetworks(String[]? adapters = null) {
+    public async Task<List<WirelessNetworkInfo>> RetrieveWirelessNetworks(String[] adapters = null) {
       List<WirelessNetworkInfo> result = new List<WirelessNetworkInfo>();
 
-      foreach(String? networkAdapter in adapters ?? (await this.RetrieveAdapters()).Where(x => x.IsWireless).Select(x => x.Name)) {
+      foreach(String networkAdapter in adapters ?? (await this.RetrieveAdapters()).Where(x => x.IsWireless).Select(x => x.Name)) {
         String wirelessOutput = await ProcessRunner.GetProcessOutputAsync("iwlist", $"{networkAdapter} scanning").ConfigureAwait(false);
         String[] outputLines = wirelessOutput.Split('\n').Select(x => x.Trim()).Where(x => String.IsNullOrWhiteSpace(x) == false).ToArray();
 
@@ -90,9 +90,7 @@ namespace Unosquare.RaspberryIO.Computer {
         }
       }
 
-      return result
-          .OrderBy(x => x.Name)
-          .ToList();
+      return result.OrderBy(x => x.Name).ToList();
     }
 
     /// <summary>
@@ -103,7 +101,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <param name="password">The password (8 characters as minimum length).</param>
     /// <param name="countryCode">The 2-letter country code in uppercase. Default is US.</param>
     /// <returns>True if successful. Otherwise, false.</returns>
-    public async Task<Boolean> SetupWirelessNetwork(String adapterName, String networkSsid, String? password = null, String countryCode = "US") {
+    public async Task<Boolean> SetupWirelessNetwork(String adapterName, String networkSsid, String password = null, String countryCode = "US") {
       // TODO: Get the country where the device is located to set 'country' param in payload var
       String payload = $"country={countryCode}\nctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev\nupdate_config=1\n";
 
@@ -111,9 +109,7 @@ namespace Unosquare.RaspberryIO.Computer {
         throw new InvalidOperationException("The password must be at least 8 characters length.");
       }
 
-      payload += String.IsNullOrEmpty(password)
-          ? $"network={{\n\tssid=\"{networkSsid}\"\n\tkey_mgmt=NONE\n\t}}\n"
-          : $"network={{\n\tssid=\"{networkSsid}\"\n\tpsk=\"{password}\"\n\t}}\n";
+      payload += String.IsNullOrEmpty(password) ? $"network={{\n\tssid=\"{networkSsid}\"\n\tkey_mgmt=NONE\n\t}}\n" : $"network={{\n\tssid=\"{networkSsid}\"\n\tpsk=\"{password}\"\n\t}}\n";
       try {
         File.WriteAllText("/etc/wpa_supplicant/wpa_supplicant.conf", payload);
         _ = await ProcessRunner.GetProcessOutputAsync("pkill", "-f wpa_supplicant");
@@ -212,7 +208,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// Retrieves the current network adapter.
     /// </summary>
     /// <returns>The name of the current network adapter.</returns>
-    public static async Task<String?> GetCurrentAdapterName() {
+    public static async Task<String> GetCurrentAdapterName() {
       String result = await ProcessRunner.GetProcessOutputAsync("route").ConfigureAwait(false);
       String defaultLine = result.Split(new[] { '\n' }, StringSplitOptions.RemoveEmptyEntries).FirstOrDefault(l => l.StartsWith("default", StringComparison.OrdinalIgnoreCase));
 
@@ -226,7 +222,7 @@ namespace Unosquare.RaspberryIO.Computer {
     public Task<String> GetWirelessNetworkName() => ProcessRunner.GetProcessOutputAsync("iwgetid", "-r");
 
     private static void GetIPv4(String indentedLine, NetworkAdapterInfo adapter) {
-      String? addressText = ParseOutputTagFromLine(indentedLine, "inet addr:") ?? ParseOutputTagFromLine(indentedLine, "inet ");
+      String addressText = ParseOutputTagFromLine(indentedLine, "inet addr:") ?? ParseOutputTagFromLine(indentedLine, "inet ");
 
       if(addressText == null) {
         return;
@@ -238,7 +234,7 @@ namespace Unosquare.RaspberryIO.Computer {
     }
 
     private static void GetIPv6(String indentedLine, NetworkAdapterInfo adapter) {
-      String? addressText = ParseOutputTagFromLine(indentedLine, "inet6 addr:") ?? ParseOutputTagFromLine(indentedLine, "inet6 ");
+      String addressText = ParseOutputTagFromLine(indentedLine, "inet6 addr:") ?? ParseOutputTagFromLine(indentedLine, "inet6 ");
 
       if(addressText == null) {
         return;
@@ -249,7 +245,7 @@ namespace Unosquare.RaspberryIO.Computer {
       }
     }
 
-    private static String? ParseOutputTagFromLine(String indentedLine, String tagName) {
+    private static String ParseOutputTagFromLine(String indentedLine, String tagName) {
       if(indentedLine.IndexOf(tagName, StringComparison.Ordinal) < 0) {
         return null;
       }

Unosquare.RaspberryIO/Computer/OsInfo.cs

@@ -8,42 +8,42 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// System name.
     /// </summary>
-    public String? SysName {
+    public String SysName {
       get; set;
     }
 
     /// <summary>
     /// Node name.
     /// </summary>
-    public String? NodeName {
+    public String NodeName {
       get; set;
     }
 
     /// <summary>
     /// Release level.
     /// </summary>
-    public String? Release {
+    public String Release {
       get; set;
     }
 
     /// <summary>
     /// Version level.
     /// </summary>
-    public String? Version {
+    public String Version {
       get; set;
     }
 
     /// <summary>
     /// Hardware level.
     /// </summary>
-    public String? Machine {
+    public String Machine {
       get; set;
     }
 
     /// <summary>
     /// Domain name.
     /// </summary>
-    public String? DomainName {
+    public String DomainName {
       get; set;
     }
 

Unosquare.RaspberryIO/Computer/SystemInfo.cs

@@ -6,7 +6,7 @@ using System.Linq;
 using System.Reflection;
 
 using Swan;
-using Swan.DependencyInjection;
+using Swan.DependencyInjection;
 
 using Unosquare.RaspberryIO.Abstractions;
 using Unosquare.RaspberryIO.Native;
@@ -84,7 +84,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// Gets the library version.
     /// </summary>
-    public Version? LibraryVersion {
+    public Version LibraryVersion {
       get; private set;
     }
 
@@ -94,7 +94,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <value>
     /// The os information.
     /// </value>
-    public OsInfo? OperatingSystem {
+    public OsInfo OperatingSystem {
       get; set;
     }
 
@@ -135,63 +135,63 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// Gets the CPU model name.
     /// </summary>
-    public String? ModelName {
+    public String ModelName {
       get; private set;
     }
 
     /// <summary>
     /// Gets a list of supported CPU features.
     /// </summary>
-    public String[]? Features {
+    public String[] Features {
       get; private set;
     }
 
     /// <summary>
     /// Gets the CPU implementer hex code.
     /// </summary>
-    public String? CpuImplementer {
+    public String CpuImplementer {
       get; private set;
     }
 
     /// <summary>
     /// Gets the CPU architecture code.
     /// </summary>
-    public String? CpuArchitecture {
+    public String CpuArchitecture {
       get; private set;
     }
 
     /// <summary>
     /// Gets the CPU variant code.
     /// </summary>
-    public String? CpuVariant {
+    public String CpuVariant {
       get; private set;
     }
 
     /// <summary>
     /// Gets the CPU part code.
     /// </summary>
-    public String? CpuPart {
+    public String CpuPart {
       get; private set;
     }
 
     /// <summary>
     /// Gets the CPU revision code.
     /// </summary>
-    public String? CpuRevision {
+    public String CpuRevision {
       get; private set;
     }
 
     /// <summary>
     /// Gets the hardware model number.
     /// </summary>
-    public String? Hardware {
+    public String Hardware {
       get; private set;
     }
 
     /// <summary>
     /// Gets the hardware revision number.
     /// </summary>
-    public String? Revision {
+    public String Revision {
       get; private set;
     }
 
@@ -206,7 +206,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// Gets the board model (accordingly to new-style revision codes).
     /// </summary>
     /// /// <exception cref="InvalidOperationException">This board does not support new-style revision codes. Use {nameof(RaspberryPiVersion)}.</exception>
-    public BoardModel BoardModel => this.NewStyleRevisionCodes ?  this._boardModel : throw new InvalidOperationException($"This board does not support new-style revision codes. Use {nameof(this.RaspberryPiVersion)} property instead.");
+    public BoardModel BoardModel => this.NewStyleRevisionCodes ? this._boardModel : throw new InvalidOperationException($"This board does not support new-style revision codes. Use {nameof(this.RaspberryPiVersion)} property instead.");
 
     /// <summary>
     /// Gets processor model (accordingly to new-style revision codes).
@@ -229,7 +229,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// Gets the serial number.
     /// </summary>
-    public String? Serial {
+    public String Serial {
       get; private set;
     }
 
@@ -271,7 +271,7 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// Placeholder for processor index.
     /// </summary>
-    private String? Processor {
+    private String Processor {
       get; set;
     }
 
@@ -288,7 +288,7 @@ namespace Unosquare.RaspberryIO.Computer {
       List<String> propertyValues2 = new List<String> {
         "System Information",
         $"\t{nameof(this.LibraryVersion),-22}: {this.LibraryVersion}",
-        $"\t{nameof(this.RaspberryPiVersion),-22}: {this.RaspberryPiVersion}"
+        $"\t{nameof(this.RaspberryPiVersion),-22}: {this.RaspberryPiVersion}",
       };
 
       foreach(PropertyInfo property in properties) {
@@ -324,7 +324,7 @@ namespace Unosquare.RaspberryIO.Computer {
       Boolean hasSysInfo = DependencyContainer.Current.CanResolve<ISystemInfo>();
 
       try {
-        if(String.IsNullOrWhiteSpace(this.Revision) == false && Int32.TryParse(this.Revision != null ? this.Revision.ToUpperInvariant() : "", NumberStyles.HexNumber, CultureInfo.InvariantCulture, out Int32 boardVersion)) {
+        if(String.IsNullOrWhiteSpace(this.Revision) == false && Int32.TryParse(this.Revision.ToUpperInvariant(), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out Int32 boardVersion)) {
           this.RaspberryPiVersion = PiVersion.Unknown;
           if(Enum.IsDefined(typeof(PiVersion), boardVersion)) {
             this.RaspberryPiVersion = (PiVersion)boardVersion;

Unosquare.RaspberryIO/Computer/WirelessNetworkInfo.cs

@@ -8,14 +8,14 @@ namespace Unosquare.RaspberryIO.Computer {
     /// <summary>
     /// Gets the ESSID of the Wireless network.
     /// </summary>
-    public String? Name {
+    public String Name {
       get; internal set;
     }
 
     /// <summary>
     /// Gets the network quality.
     /// </summary>
-    public String? Quality {
+    public String Quality {
       get; internal set;
     }
 

Unosquare.RaspberryIO/Native/Standard.cs

@@ -1,5 +1,5 @@
-using System;
-using System.Runtime.InteropServices;
+using System;
+using System.Runtime.InteropServices;
 
 namespace Unosquare.RaspberryIO.Native {
   internal static class Standard {

Unosquare.RaspberryIO/Native/SystemName.cs

@@ -1,5 +1,5 @@
-using System;
-using System.Runtime.InteropServices;
+using System;
+using System.Runtime.InteropServices;
 
 namespace Unosquare.RaspberryIO.Native {
   /// <summary>

Unosquare.RaspberryIO/Pi.cs

@@ -1,5 +1,5 @@
 using System;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 
 using Swan;
 using Swan.DependencyInjection;
@@ -16,7 +16,7 @@ namespace Unosquare.RaspberryIO {
     private const String MissingDependenciesMessage = "You need to load a valid assembly (WiringPi or PiGPIO).";
     private static readonly Object SyncLock = new Object();
     private static Boolean _isInit;
-    private static SystemInfo? _info;
+    private static SystemInfo _info;
 
     /// <summary>
     /// Initializes static members of the <see cref="Pi" /> class.

Unosquare.RaspberryIO/Unosquare.RaspberryIO.csproj

@@ -16,7 +16,6 @@ This library enables developers to use the various Raspberry Pi's hardware modul
     <PackageLicenseUrl>https://raw.githubusercontent.com/unosquare/raspberryio/master/LICENSE</PackageLicenseUrl>
     <PackageTags>Raspberry Pi GPIO Camera SPI I2C Embedded IoT Mono C# .NET</PackageTags>
     <LangVersion>8.0</LangVersion>
-	<Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>