Disable PaginateViaPrimaryKey without Take (#375)

Author: AlekseyMartynov

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

@@ -93,12 +93,25 @@ public void ActiveForFirstPage() {
             Assert.Contains(".Select(obj => new AnonType`1", loadOptions.ExpressionLog[0]);
         }
 
+        [Fact]
+        public void DisabledWithoutTake() {
+            var loadOptions = new SampleLoadOptions {
+                SuppressGuardNulls = true,
+                PaginateViaPrimaryKey = true
+            };
+
+            DataSourceLoader.Load(new object[0], loadOptions);
+
+            Assert.NotEmpty(loadOptions.ExpressionLog);
+            Assert.DoesNotContain(loadOptions.ExpressionLog, line => line.Contains(".Select"));
+        }
+
         [Fact]
         public void RequiresPrimaryKey() {
             var error = Record.Exception(delegate {
                 DataSourceLoader.Load(new string[0], new SampleLoadOptions {
                     PaginateViaPrimaryKey = true,
-                    Skip = 1
+                    Take = 1
                 });
             });
             Assert.True(error is InvalidOperationException);

net/DevExtreme.AspNet.Data/DataSourceLoaderImpl.cs

@@ -66,7 +66,7 @@ public LoadResult Load() {
 
                 Expression loadExpr;
 
-                if(!deferPaging && Context.PaginateViaPrimaryKey) {
+                if(!deferPaging && Context.PaginateViaPrimaryKey && Context.Take > 0) {
                     if(!Context.HasPrimaryKey) {
                         throw new InvalidOperationException(nameof(DataSourceLoadOptionsBase.PaginateViaPrimaryKey)
                             + " requires a primary key."