Case-insensitive string comparison in DataSourceLoadContext.FullSelect (#401)

Author: AlekseyMartynov

net/DevExtreme.AspNet.Data.Tests/DataSourceLoaderTests.cs

@@ -445,6 +445,21 @@ IDictionary<string, object> Load(string[] preSelect, string[] select) {
             Assert.True(item.ContainsKey("b"));
         }
 
+        [Fact]
+        public void Load_PreSelect_CI() {
+            // https://github.com/DevExpress/DevExtreme.AspNet.Data/pull/400
+
+            var loadOptions = new SampleLoadOptions {
+                Select = new[] { "prop" },
+                PreSelect = new[] { "Prop" }
+            };
+
+            var loadResult = DataSourceLoader.Load(new[] { new { Prop = 123 } }, loadOptions);
+            var items = loadResult.data.Cast<IDictionary<string, object>>().ToArray();
+
+            Assert.Equal(123, items.First()["Prop"]);
+        }
+
         [Theory]
         [InlineData(false)]
         [InlineData(null)]

net/DevExtreme.AspNet.Data/DataSourceLoadContext.cs

@@ -261,7 +261,7 @@ string[] Init() {
                     var hasPreSelect = !IsEmpty(_options.PreSelect);
 
                     if(hasPreSelect && hasSelect)
-                        return Enumerable.Intersect(_options.PreSelect, _options.Select).ToArray();
+                        return Enumerable.Intersect(_options.PreSelect, _options.Select, StringComparer.OrdinalIgnoreCase).ToArray();
 
                     if(hasPreSelect)
                         return _options.PreSelect;