Update to v3.0.0 of the SDK

samples/Directory.Build.targets

@@ -1,5 +1,5 @@
 <Project>
     <ItemGroup>
-        <PackageReference Include="DocumentFormat.OpenXml" Version="2.20.0" />
+        <PackageReference Include="DocumentFormat.OpenXml" Version="3.0.0" />
     </ItemGroup>
 </Project>

samples/presentation/get_all_the_text_all_slides/cs/Program.cs

@@ -58,9 +58,9 @@ static void GetSlideIdAndText(out string sldText, string docName, int index)
     {
         // Get the relationship ID of the first slide.
         PresentationPart? part = ppt.PresentationPart;
-        OpenXmlElementList? slideIds = part?.Presentation?.SlideIdList?.ChildElements;
+        OpenXmlElementList slideIds = part?.Presentation?.SlideIdList?.ChildElements ?? default;
 
-        if (part is null || slideIds is null || slideIds.Count == 0)
+        if (part is null || slideIds.Count == 0)
         {
             sldText = "";
             return;

samples/presentation/get_the_titles_of_all_the_slides/cs/Program.cs

@@ -115,18 +115,7 @@ static bool IsTitleShape(Shape shape)
 
     if (placeholderShape is not null && placeholderShape.Type is not null && placeholderShape.Type.HasValue)
     {
-        switch ((PlaceholderValues)placeholderShape.Type)
-        {
-            // Any title shape.
-            case PlaceholderValues.Title:
-
-            // A centered title.
-            case PlaceholderValues.CenteredTitle:
-                return true;
-
-            default:
-                return false;
-        }
+        return placeholderShape.Type == PlaceholderValues.Title || placeholderShape.Type == PlaceholderValues.CenteredTitle;
     }
 
     return false;

samples/presentation/insert_a_new_slideto/cs/Program.cs

@@ -91,12 +91,7 @@ static void InsertNewSlideFromPresentation(PresentationDocument presentationDocu
     uint maxSlideId = 1;
     SlideId? prevSlideId = null;
 
-    OpenXmlElementList? slideIds = slideIdList?.ChildElements;
-
-    if (slideIds is null)
-    {
-        throw new ArgumentNullException(nameof(slideIds));
-    }
+    OpenXmlElementList slideIds = slideIdList?.ChildElements ?? default;
 
     foreach (SlideId slideId in slideIds)
     {

samples/presentation/open_for_read_only_access/cs/Program.cs

@@ -16,10 +16,10 @@ static void GetSlideIdAndText(out string sldText, string docName, int index)
     {
         // Get the relationship ID of the first slide.
         PresentationPart? part = ppt.PresentationPart;
-        OpenXmlElementList? slideIds = part?.Presentation?.SlideIdList?.ChildElements;
+        OpenXmlElementList slideIds = part?.Presentation?.SlideIdList?.ChildElements ?? default;
 
         // If there are no slide IDs then there are no slides.
-        if (slideIds is null || slideIds.Count() < 1)
+        if (slideIds.Count == 0)
         {
             sldText = "";
             return;

samples/spreadsheet/retrieve_the_values_of_cells/cs/Program.cs

@@ -51,38 +51,35 @@ static string GetCellValue(string fileName, string sheetName, string addressName
         // the words TRUE or FALSE.
         if (theCell.DataType is not null)
         {
-            switch (theCell.DataType.Value)
+            if (theCell.DataType.Value == CellValues.SharedString)
             {
-                case CellValues.SharedString:
 
-                    // For shared strings, look up the value in the
-                    // shared strings table.
-                    var stringTable =
-                        wbPart.GetPartsOfType<SharedStringTablePart>().FirstOrDefault();
+                // For shared strings, look up the value in the
+                // shared strings table.
+                var stringTable =
+                    wbPart.GetPartsOfType<SharedStringTablePart>().FirstOrDefault();
 
-                    // If the shared string table is missing, something 
-                    // is wrong. Return the index that is in
-                    // the cell. Otherwise, look up the correct text in 
-                    // the table.
-                    if (stringTable is not null)
-                    {
-                        value =
-                            stringTable.SharedStringTable.ElementAt(int.Parse(value)).InnerText;
-                    }
-
-                    break;
-
-                case CellValues.Boolean:
-                    switch (value)
-                    {
-                        case "0":
-                            value = "FALSE";
-                            break;
-                        default:
-                            value = "TRUE";
-                            break;
-                    }
-                    break;
+                // If the shared string table is missing, something 
+                // is wrong. Return the index that is in
+                // the cell. Otherwise, look up the correct text in 
+                // the table.
+                if (stringTable is not null)
+                {
+                    value =
+                        stringTable.SharedStringTable.ElementAt(int.Parse(value)).InnerText;
+                }
+            }
+            else if (theCell.DataType.Value == CellValues.Boolean)
+            {
+                switch (value)
+                {
+                    case "0":
+                        value = "FALSE";
+                        break;
+                    default:
+                        value = "TRUE";
+                        break;
+                }
             }
         }
     }