918 (DataColumnOrdinalIgnoreCaseComparer)

Author: StefH

src-console/ConsoleApp_net6.0/ConsoleApp_net6.0.csproj

@@ -1,15 +1,16 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
         <TargetFramework>net6.0</TargetFramework>
         <RootNamespace>ConsoleApp_net6._0</RootNamespace>
         <Nullable>enable</Nullable>
+        <LangVersion>12</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>
-      <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core.NewtonsoftJson\System.Linq.Dynamic.Core.NewtonsoftJson.csproj" />
-      <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core.SystemTextJson\System.Linq.Dynamic.Core.SystemTextJson.csproj" />
+        <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core.NewtonsoftJson\System.Linq.Dynamic.Core.NewtonsoftJson.csproj" />
+        <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core.SystemTextJson\System.Linq.Dynamic.Core.SystemTextJson.csproj" />
     </ItemGroup>
 
-</Project>
+</Project>

src-console/ConsoleApp_net6.0/DataColumnOrdinalIgnoreCaseComparer.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections;
+
+namespace ConsoleApp_net6._0;
+
+public class DataColumnOrdinalIgnoreCaseComparer : IComparer
+{
+    public int Compare(object? x, object? y)
+    {
+        if (x == null && y == null)
+        {
+            return 0;
+        }
+
+        if (x == null)
+        {
+            return -1;
+        }
+
+        if (y == null)
+        {
+            return 1;
+        }
+
+        if (x is string xAsString && y is string yAsString)
+        {
+            return StringComparer.OrdinalIgnoreCase.Compare(xAsString, yAsString);
+        }
+
+        return Comparer.Default.Compare(x, y);
+    }
+}

src-console/ConsoleApp_net6.0/Program.cs

@@ -41,8 +41,11 @@ class Program
 {
     static void Main(string[] args)
     {
-        Q912a();
-        Q912b();
+        Issue918();
+        return;
+
+        Issue912a();
+        Issue912b();
         return;
 
         Json();
@@ -68,7 +71,33 @@ static void Main(string[] args)
         Dynamic();
     }
 
-    private static void Q912a()
+    private static void Issue918()
+    {
+        var persons = new DataTable();
+        persons.Columns.Add("FirstName", typeof(string));
+        persons.Columns.Add("Nickname", typeof(string));
+        persons.Columns.Add("Income", typeof(decimal)).AllowDBNull = true;
+
+        // Adding sample data to the first DataTable
+        persons.Rows.Add("alex", DBNull.Value, 5000.50m);
+        persons.Rows.Add("MAGNUS", "Mag", 5000.50m);
+        persons.Rows.Add("Terry", "Ter", 4000.20m);
+        persons.Rows.Add("Charlotte", "Charl", DBNull.Value);
+
+        var linqQuery =
+            from personsRow in persons.AsEnumerable()
+            select personsRow;
+
+        var queryableRows = linqQuery.AsQueryable();
+
+        // Sorted at the top of the list
+        var comparer = new DataColumnOrdinalIgnoreCaseComparer();
+        var sortedRows = queryableRows.OrderBy("FirstName", comparer).ToList();
+
+        int xxx = 0;
+    }
+
+    private static void Issue912a()
     {
         var extractedRows = new List<SalesData>
         {
@@ -97,7 +126,7 @@ private static void Q912a()
         int x = 9;
     }
 
-    private static void Q912b()
+    private static void Issue912b()
     {
         var eInfoJoinTable = new DataTable();
         eInfoJoinTable.Columns.Add("Region", typeof(string));