Improve exceptions

Author: Planktomas

SpreadsheetUtility/Spreadsheet.cs

@@ -250,8 +250,17 @@ void WriteData<T>(List<PropertyInfo> properties, IEnumerable<T> source)
                 for (int x = 0; x < properties.Count(); x++)
                 {
                     var row = y + 1;
-                    var value = (string?)Convert.ChangeType(properties[x].GetValue(source.ElementAt(y)),
-                        typeof(string), CultureInfo.InvariantCulture);
+                    string? value;
+
+                    try
+                    {
+                        value = (string?)Convert.ChangeType(properties[x].GetValue(source.ElementAt(y)),
+                            typeof(string), CultureInfo.InvariantCulture);
+                    }
+                    catch (Exception innerException)
+                    {
+                        throw new Exception($"Could convert value of property '{properties[x].Name}' to string. The value would have been written to cell '{Cell(row, y)}'", innerException);
+                    }
 
                     if (properties[x].PropertyType == typeof(string))
                     {
@@ -285,8 +294,15 @@ IEnumerable<T> ReadData<T>(Dictionary<PropertyInfo, int> properties)
                     if (!property.Key.CanWrite)
                         continue;
 
-                    property.Key.SetValue(entry, Convert.ChangeType(value,
-                        property.Key.PropertyType, CultureInfo.InvariantCulture));
+                    try
+                    {
+                        property.Key.SetValue(entry, Convert.ChangeType(value,
+                            property.Key.PropertyType, CultureInfo.InvariantCulture));
+                    }
+                    catch (Exception innerException)
+                    {
+                        throw new Exception($"Could not set value '{value}' to property '{property.Key.Name}'. The value was read in cell '{Cell(property.Value, y)}'", innerException);
+                    }
                 }
 
                 data.Add(entry);

SpreadsheetUtility/SpreadsheetUtility.csproj

@@ -11,7 +11,7 @@
     <RepositoryUrl>https://github.com/Planktomas/SpreadsheetUtility</RepositoryUrl>
     <PackageTags>excel;spreadsheet;utility;sheet;lightweight;report;xlsx;xls;review;analysis;data</PackageTags>
     <Authors>Tomas Kucinskas</Authors>
-    <Version>1.3.0</Version>
+    <Version>1.3.1</Version>
     <Description>Ultra lightweight spreadsheet utility to display processed collections of data and occasionally reading it.</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageReadmeFile>README.md</PackageReadmeFile>