Support types without object equal operator ( extend test for DateTim…

…e, TimeSpan ) (#3152)

* Add test for DateTime and TimeSpan

~ set CultureInfo on test start
+ add test for DateTime
+ add test for TimeSpan

* Value type comparison

+ implement value type handling for expression compare
~ fix timespan test to use correct expecting values

* add more test & simplify

+ add more corner test
~ replace activator with expression default
~ replace member.reflectedtype with item.type

Source/Extensions/Blazorise.DataGrid/Utils/FunctionCompiler.cs

@@ -41,7 +41,7 @@ private static Expression GetSafePropertyOrField( Expression item, string proper
             if ( field == null )
                 throw new ArgumentException( $"Cannot detect the member of {item.Type}", propertyOrFieldName );
 
-            field = Expression.Condition( Expression.Equal( item, Expression.Constant( null ) ),
+            field = Expression.Condition( Expression.Equal( item, Expression.Default( item.Type ) ),
                         IsNullable( field.Type ) ? Expression.Constant( null, field.Type ) : Expression.Default( field.Type ), 
                         field );
 

Tests/Blazorise.Tests/DataGrid/Utils/FunctionCompilerTests.cs

@@ -1,6 +1,5 @@
-using System.Collections;
-using System.Collections.Generic;
-using Blazorise.DataGrid;
+using System;
+using System.Globalization;
 using Blazorise.DataGrid.Utils;
 using Xunit;
 
@@ -9,10 +8,15 @@ namespace Blazorise.Tests.DataGrid.Utils
     public class FunctionCompilerTests
     {
         [Theory]
-        [InlineData("Id", "0")]
+        [InlineData( "Id", "0" )]
         [InlineData( "Name", null )]
         [InlineData( "Value", null )]
         [InlineData( "Boolean", "False" )]
+        [InlineData( "DateTime", "1/1/0001 12:00:00 AM" )]
+        [InlineData( "DateTime.TimeOfDay", "00:00:00" )]
+        [InlineData( "DateTimeNull", null )]
+        [InlineData( "TimeSpan", "00:00:00" )]
+        [InlineData( "TimeSpanNull", null )]
         [InlineData( "Information.Id", "0" )]
         [InlineData( "Information.Message", null )]
         [InlineData( "Information.Detail.Id", "0" )]
@@ -30,6 +34,11 @@ public void ValueGetter_ReturnsCorrectPropertyOrField_DefaultValue(string field,
         [InlineData( "Name", "John" )]
         [InlineData( "Value", "200" )]
         [InlineData( "Boolean", "True" )]
+        [InlineData( "DateTime", "12/31/9999 11:59:59 PM" )]
+        [InlineData( "DateTime.TimeOfDay", "23:59:59.9999999" )]
+        [InlineData( "DateTimeNull", "8/18/2018 12:00:00 AM" )]
+        [InlineData( "TimeSpan", "10675199.02:48:05.4775807" )]
+        [InlineData( "TimeSpanNull", "20:00:00" )]
         [InlineData( "Information.Id", "1000" )]
         [InlineData( "Information.Message", "This is a message!" )]
         [InlineData( "Information.Detail.Id", "2000" )]
@@ -42,6 +51,12 @@ public void ValueGetter_ReturnsCorrectPropertyOrField_ActualValue( string field,
             Assert.Equal( expected, valueGetter( test )?.ToString() );
         }
 
+        public FunctionCompilerTests()
+        {
+            // force to use us culture info
+            CultureInfo.CurrentCulture = new CultureInfo( "en-US" );
+        }
+
         private Test GetTest()
         {
             return new()
@@ -50,6 +65,10 @@ private Test GetTest()
                 Name = "John",
                 Value = 200,
                 Boolean = true,
+                DateTime = DateTime.MaxValue,
+                DateTimeNull = DateTime.Parse( "08/18/2018" ),
+                TimeSpan = TimeSpan.MaxValue,
+                TimeSpanNull = TimeSpan.FromHours( 20.0 ),
                 Information = new()
                 {
                     Id = 1000,
@@ -71,6 +90,10 @@ private class Test
             public string Name { get; set; }
             public int? Value { get; set; }
             public bool Boolean { get; set; }
+            public DateTime DateTime { get; set; }
+            public DateTime? DateTimeNull { get; set; }
+            public TimeSpan TimeSpan { get; set; }
+            public TimeSpan? TimeSpanNull { get; set; }
             public Information Information { get; set; }
         }