cleared null exception

Author: Harsha-SF4223

maui/samples/Gallery/SampleList/CartesianChartSamplesList.xml

@@ -57,8 +57,6 @@
 			  </CardLayout>
 		  </SubCategory>
 
-      <Sample Title="Fast Scatter" StatusTag="New" SampleName="FastScatterChart" SearchTags="scatter, scatter chart, scatter plot, fast scatter, fast scatter chart, fast scatter plot, high performance chart"/>
-
 		  <SubCategory Title="Spline">
 			  <CardLayout>
 				  <Sample Title="Default spline chart" SampleName="SplineChart" Description="This sample demonstrates the default spline chart. The marker, tooltip, and legend are enabled in the model. Tap the data point to view information about that data point in a tooltip." SearchTags="spline"/>

maui/src/Charts/Series/BoxAndWhiskerSeries.cs

@@ -743,7 +743,7 @@ internal override void GeneratePropertyPoints(string[] yPaths, IList<double>[] y
 			}
 		}
 
-		internal override void SetIndividualPoint(int index, object obj, bool replace)
+		internal override void SetIndividualPoint(object obj, int index, bool replace)
 		{
 			if (YDataCollection != null && YPaths != null && ItemsSource != null)
 			{

maui/src/Charts/Series/CartesianSeries.cs

@@ -1065,12 +1065,9 @@ internal override void OnDataSourceChanged(object oldValue, object newValue)
             InvalidateSideBySideSeries();
 			foreach (var item in EmptyPointIndexes)
 			{
-				if (item != null)
-
-				{
-					item.Clear();
-				}
+				item?.Clear();
 			}
+
 			base.OnDataSourceChanged(oldValue, newValue);
         }
 
@@ -1080,31 +1077,25 @@ internal override void OnDataSource_CollectionChanged(object? sender, NotifyColl
             base.OnDataSource_CollectionChanged(sender, e);
         }
 
-        internal override void AddDataPoint(int index, object data,  NotifyCollectionChangedEventArgs e)
+        internal override void AddDataPoint(object data, int index, NotifyCollectionChangedEventArgs e)
         {
 			ResetEmptyPointIndexes();
 			foreach (var item in EmptyPointIndexes)
 			{
-				if (item != null)
-
-				{
-					item.Clear();
-				}
+				item?.Clear();
 			}
-			base.AddDataPoint(index, data,  e);
+
+			base.AddDataPoint(data, index,  e);
         }
 
         internal override void RemoveData(int index, NotifyCollectionChangedEventArgs e)
         {
 			ResetEmptyPointIndexes();
 			foreach (var item in EmptyPointIndexes)
 			{
-				if (item != null)
-
-				{
-					item.Clear();
-				}
+				item?.Clear();
 			}
+
 			base.RemoveData(index, e);
         }
 

maui/src/Charts/Series/ChartSeriesPartial.cs

@@ -82,10 +82,10 @@ internal ChartValueType XValueType
 		#region Internal Methods
 
 #pragma warning disable IDE0060 // Remove unused parameter
-		internal virtual void AddDataPoint(int index, object data, NotifyCollectionChangedEventArgs e)
+		internal virtual void AddDataPoint(object data, int index, NotifyCollectionChangedEventArgs e)
 #pragma warning restore IDE0060 // Remove unused parameter
 		{
-			SetIndividualPoint(index, data, false);
+			SetIndividualPoint(data, index, false);
 		}
 
 		internal virtual void LegendItemToggled(LegendItem chartLegendItem)
@@ -116,7 +116,7 @@ internal virtual void GenerateDataPoints()
 		internal virtual void OnDataSource_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
 		{
 			IsDataPointAddedDynamically = false;
-			e.ApplyCollectionChanges((obj, index, canInsert) => AddDataPoint(index, obj, e), (obj, index) => RemoveData(index, e), ResetDataPoint);
+			e.ApplyCollectionChanges((obj, index, canInsert) => AddDataPoint(obj, index, e), (obj, index) => RemoveData(index, e), ResetDataPoint);
 
 			if (e.Action == NotifyCollectionChangedAction.Add && EnableAnimation && AnimationDuration > 0)
 			{
@@ -219,7 +219,7 @@ internal void InvalidateGroupValues()
 		//TODO:Need to remove the replace parameter from this method,
 		//because new notify collectionChanged event first remove
 		//the data and then insert the data. So no need replace parameter here after.
-		internal virtual void SetIndividualPoint(int index, object obj, bool replace)
+		internal virtual void SetIndividualPoint(object obj, int index, bool replace)
 		{
 			if (SeriesYValues != null && YPaths != null && ItemsSource != null)
 			{

maui/src/Charts/Series/PieSeries.cs

@@ -599,9 +599,9 @@ internal override void RemoveData(int index, NotifyCollectionChangedEventArgs e)
 			CalculateGroupToYValues();
 		}
 
-		internal override void SetIndividualPoint(int index, object obj, bool replace)
+		internal override void SetIndividualPoint(object obj, int index, bool replace)
 		{
-			base.SetIndividualPoint(index, obj, replace);
+			base.SetIndividualPoint(obj, index, replace);
 
 			CalculateGroupToYValues();
 		}

maui/src/Charts/Series/RangeColumnSeries.cs

@@ -417,6 +417,10 @@ internal override void GenerateTrackballPointInfo(List<object> nearestDataPoints
                     double yValue = yValues[index];
                     double yValue1 = yValues1[index];
                     string label = string.Format("{0} : {1:#.##}\n{2} : {3:#.##}", SfCartesianChartResources.High, yValue, SfCartesianChartResources.Low, yValue1);
+					if (yValue == 0 || yValue1 == 0)
+					{
+						label = string.Format("{0} : {1:0.##}\n{2} : {3:0.##}", SfCartesianChartResources.High, yValue, SfCartesianChartResources.Low, yValue1);
+					}
 
                     if (IsSideBySide)
                     {

maui/src/Charts/Series/SplineRangeAreaSeries.cs

@@ -491,6 +491,11 @@ internal override void GenerateTrackballPointInfo(List<object> nearestDataPoints
                     double highValue = highValues[index];
                     double lowValue = lowValues[index];
                     string label = string.Format("{0} : {1:#.##}\n{2} : {3:#.##}", SfCartesianChartResources.High, highValue, SfCartesianChartResources.Low, lowValue);
+					if (highValue == 0 || lowValue == 0)
+					{
+						label = string.Format("{0} : {1:0.##}\n{2} : {3:0.##}", SfCartesianChartResources.High, highValue, SfCartesianChartResources.Low, lowValue);
+					}
+
                     var xPoint = TransformToVisibleX(xValue, topValue);
                     var yPoint = TransformToVisibleY(xValue, topValue);