add columnorder attribute for ordering properties on tabledata

appveyor.yml

@@ -1,4 +1,4 @@
-version: 2.0.3
+version: 2.1.0
 
 environment:
   nuget_token:

samples/NooBIT.DataTables.Sample/Model/SampleData.cs

@@ -1,8 +1,13 @@
-namespace NooBIT.DataTables.Sample.Model
+using NooBIT.DataTables.Attributes;
+
+namespace NooBIT.DataTables.Sample.Model
 {
     public class SampleData
     {
+        [ColumnOrder(0)]
         public int Id { get; set; }
+
+        [ColumnOrder(1)]
         public string Name { get; set; }
     }
 }

src/NooBIT.DataTables/Attributes/ColumnOrderAttribute.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace NooBIT.DataTables.Attributes
+{
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
+    public class ColumnOrderAttribute : Attribute
+    {
+        public ColumnOrderAttribute(int order)
+        {
+            Order = order;
+        }
+
+        public int Order { get; }
+    }
+}

src/NooBIT.DataTables/DataTable.cs

@@ -5,6 +5,7 @@
 using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
+using NooBIT.DataTables.Attributes;
 using NooBIT.DataTables.Helpers;
 using NooBIT.DataTables.Models;
 using NooBIT.DataTables.Queries;
@@ -159,8 +160,9 @@ private IEnumerable<SortInstruction> GenerateSortInstructions(DataTableRequest r
 
         public Column[] Columns => _columns ?? (_columns = GetColumnsInternal());
 
-        protected virtual Column[] GetColumnsInternal() => typeof(T)
-                .GetProperties(BindingFlags.Instance | BindingFlags.Public)
+        protected virtual Column[] GetColumnsInternal() =>
+            typeof(T).GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                .OrderBy(x => x.GetCustomAttribute<ColumnOrderAttribute>()?.Order ?? int.MaxValue)
                 .Select(GetColumnTemplate)
                 .ToArray();