简化项目，修复不支持 NLA 的 BUG

.gitignore

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+**/.vs
+*.user
+**/bin
+**/obj
+**/packages

RdpTest.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27004.2008
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RdpTest", "RdpTest\RdpTest.csproj", "{1A282828-C161-4293-BD0F-3DAA8183A32C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1A282828-C161-4293-BD0F-3DAA8183A32C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1A282828-C161-4293-BD0F-3DAA8183A32C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1A282828-C161-4293-BD0F-3DAA8183A32C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1A282828-C161-4293-BD0F-3DAA8183A32C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8CC8E13C-B621-4B9B-ACD2-4143B3A9B670}
+	EndGlobalSection
+EndGlobal

RdpTest/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <configSections>
+
+    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
+  </configSections>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
+  </startup>
+  <entityFramework>
+    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
+      <parameters>
+        <parameter value="v13.0" />
+      </parameters>
+    </defaultConnectionFactory>
+    <providers>
+      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
+      <provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
+    </providers>
+  </entityFramework>
+
+</configuration>

RdpTest/Control/HostGroupBox.cs

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+using System.ComponentModel;
+using System.Windows.Forms;
+
+namespace RdpTest.Control
+{
+    public partial class HostGroupBox : UserControl
+    {
+        public HostGroupBox()
+        {
+            InitializeComponent();
+        }
+
+        private string _text = "";
+        [Description("标题信息")]
+        public new string Text
+        {
+            get => _text;
+            set
+            {
+                _text = value;
+                lbText.Text = $"<b><font face=\"微软雅黑\" size=\"18\">{_text}</font></b>";
+            }
+        }
+
+        public void AddControl(System.Windows.Forms.Control control)
+        {
+            Body.Controls.Add(control);
+        }
+    }
+}

RdpTest/DbHelper.cs

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+using System;
+using System.Data;
+using System.Data.SQLite;
+using System.IO;
+using RdpTest.Properties;
+
+namespace RdpTest
+{
+    public class Db
+    {
+        static Db()
+        {
+            var path = AppDomain.CurrentDomain.BaseDirectory + "config.wdb";
+
+            //检查数据库是否存在，不在则新建
+            if (!File.Exists(path))
+                File.WriteAllBytes(path, Resources.Db);
+
+            //初始化数据库连接串
+            Connection = new SQLiteConnection($"Data Source={path};Pooling=true;FailIfMissing=false");
+            Connection.Open();
+        }
+
+        public static readonly IDbConnection Connection;
+
+    }
+}