Ready to beta test

classlib/ExcelReader.cs

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+using System.Data;
+using System.Data.OleDb;
+using System.Text;
+using System.Text.Json;
+
+namespace Mesa_Backlog.Library;
+
+public class ExcelReader
+{
+
+    /// <summary>
+    /// https://social.msdn.microsoft.com/Forums/en-US/2e030743-5d66-4e53-bbff-bb2eee0cbc9b/readingwriting-excel-without-excel?forum=Vsexpressvcs
+    /// </summary>
+    private static DataTable GetSheet(string fileName, string selectSql)
+    {
+        DataTable results = new();
+#if Linux
+            ()("Built on Linux!");
+#elif OSX
+            ()("Built on macOS!");
+#elif Windows || !NETCORE
+#pragma warning disable CA1416
+        for (int i = 0; i < int.MaxValue; i++)
+        {
+            try
+            {
+                OleDbConnectionStringBuilder connectionStringBuilder = new()
+                {
+                    Provider = "Microsoft.ACE.OLEDB.12.0",
+                    DataSource = fileName
+                };
+                connectionStringBuilder.Add("Extended Properties", "Excel 12.0 Xml;HDR=YES;IMEX=1;ReadOnly=1;");
+                using OleDbConnection connection = new(connectionStringBuilder.ConnectionString);
+                connection.Open();
+                using (OleDbDataAdapter adapter = new(selectSql, connection))
+                    adapter.Fill(results);
+                connection.Close();
+                break;
+            }
+            catch (Exception)
+            {
+                if (i > 3) //2019-12-28 - 001
+                    throw;
+                Thread.Sleep(1000);
+            }
+#pragma warning restore CA1416
+        }
+#else
+            ()("Built in unknown!");
+#endif
+        return results;
+    }
+
+    private static string DataTableToJSON(DataTable table)
+    {
+        string name;
+        string value;
+        object @object;
+        StringBuilder jsonString = new();
+        if (table.Rows.Count > 0)
+        {
+            _ = jsonString.Append('[');
+            for (int i = 0; i < table.Rows.Count; i++)
+            {
+                _ = jsonString.Append('{');
+                for (int j = 0; j < table.Columns.Count; j++)
+                {
+                    @object = table.Rows[i][j];
+                    if (@object is null)
+                        value = string.Empty;
+                    else
+                        value = string.Concat(@object);
+                    if (value.Contains('"'))
+                        value = value.Replace("\"", "\\\"");
+                    if (value.Contains('\n'))
+                        value = value.Replace("\t", " ").Replace("\n", "<br />");
+                    name = table.Columns[j].ColumnName.ToString();
+                    if (name == ",")
+                        name = "Title";
+                    if (name.Contains('"'))
+                        name = name.Replace("\"", "\\\"");
+                    if (name.Contains('\n'))
+                        name = name.Replace("\t", " ").Replace("\n", "<br />");
+                    _ = jsonString.Append('"').Append(name).Append("\":").Append('"').Append(value).Append('"');
+                    if (j < table.Columns.Count - 1)
+                        _ = jsonString.Append(',');
+                }
+                _ = jsonString.Append('}');
+                if (i != table.Rows.Count - 1)
+                    _ = jsonString.Append(',');
+            }
+            _ = jsonString.Append(']');
+        }
+        return jsonString.ToString();
+    }
+
+    public static string GetJson(string reportFullPath, string sheet)
+    {
+        string result;
+        string selectSql = string.Concat("SELECT * FROM [", sheet, "$]");
+        using (DataTable dataTable = GetSheet(reportFullPath, selectSql))
+        {
+            if (dataTable.Rows.Count == 0)
+                throw new Exception("No rows");
+            result = DataTableToJSON(dataTable);
+        }
+        return result;
+    }
+
+    public static FIBacklogMesa[] GetFIBacklogMesaCollection(string json)
+    {
+        FIBacklogMesa[]? results;
+        results = JsonSerializer.Deserialize<FIBacklogMesa[]>(json, new JsonSerializerOptions() { PropertyNameCaseInsensitive = true });
+        if (results is null || !results.Any())
+            throw new NullReferenceException();
+        return results;
+    }
+
+    public static string GetJson(FIBacklogMesa[]? fIBacklogMesaCollection) => JsonSerializer.Serialize(fIBacklogMesaCollection, new JsonSerializerOptions() { WriteIndented = true });
+
+}