Added demo "ProgressReport3.aspx" - using web socket to real time update the frontend

Author: adriancs2

source code/TestDebugASPNET/TestDebugASPNET.csproj

@@ -138,6 +138,7 @@
     <Content Include="pages\About.aspx" />
     <Content Include="pages\apiMain.aspx" />
     <Content Include="pages\apiProgressReport2.aspx" />
+    <Content Include="pages\apiProgressReport3.aspx" />
     <Content Include="pages\DatabaseDumpViewer.aspx" />
     <Content Include="pages\Default.aspx" />
     <Content Include="Global.asax" />
@@ -153,6 +154,7 @@
     <Content Include="pages\ProgressReport2-2.aspx" />
     <Content Include="pages\ProgressReport2-3.aspx" />
     <Content Include="pages\ProgressReport2.aspx" />
+    <Content Include="pages\ProgressReport3.aspx" />
     <Content Include="pages\ProgressReportMenu.aspx" />
     <Content Include="pages\ProgressReportSimple.aspx" />
     <Content Include="pages\QuickTestAdjustColumnValue.aspx" />
@@ -199,6 +201,13 @@
     <Compile Include="pages\apiProgressReport2.aspx.designer.cs">
       <DependentUpon>apiProgressReport2.aspx</DependentUpon>
     </Compile>
+    <Compile Include="pages\apiProgressReport3.aspx.cs">
+      <DependentUpon>apiProgressReport3.aspx</DependentUpon>
+      <SubType>ASPXCodeBehind</SubType>
+    </Compile>
+    <Compile Include="pages\apiProgressReport3.aspx.designer.cs">
+      <DependentUpon>apiProgressReport3.aspx</DependentUpon>
+    </Compile>
     <Compile Include="pages\DatabaseDumpViewer.aspx.cs">
       <DependentUpon>DatabaseDumpViewer.aspx</DependentUpon>
       <SubType>ASPXCodeBehind</SubType>
@@ -356,6 +365,13 @@
     <Compile Include="pages\ProgressReport2.aspx.designer.cs">
       <DependentUpon>ProgressReport2.aspx</DependentUpon>
     </Compile>
+    <Compile Include="pages\ProgressReport3.aspx.cs">
+      <DependentUpon>ProgressReport3.aspx</DependentUpon>
+      <SubType>ASPXCodeBehind</SubType>
+    </Compile>
+    <Compile Include="pages\ProgressReport3.aspx.designer.cs">
+      <DependentUpon>ProgressReport3.aspx</DependentUpon>
+    </Compile>
     <Compile Include="pages\ProgressReportMenu.aspx.cs">
       <DependentUpon>ProgressReportMenu.aspx</DependentUpon>
       <SubType>ASPXCodeBehind</SubType>

source code/TestDebugASPNET/engine/SQLiteHelper.NET/SQLiteHelper.cs

@@ -184,7 +184,19 @@ public dataType ExecuteScalar<dataType>(string sql, IEnumerable<SQLiteParameter>
         public dataType ExecuteScalar<dataType>(string sql)
         {
             cmd.CommandText = sql;
-            return (dataType)Convert.ChangeType(cmd.ExecuteScalar(), typeof(dataType));
+            object result = cmd.ExecuteScalar();
+
+            if (result == null || result == DBNull.Value)
+            {
+                // Handle null case
+                if (typeof(dataType).IsValueType)
+                {
+                    return default;
+                }
+                return (dataType)(object)null; // For reference types
+            }
+
+            return (dataType)Convert.ChangeType(result, typeof(dataType));
         }
 
         private List<SQLiteParameter> GetParametersList(Dictionary<string, object> dicParameters)