[ExporterGeneva]Remove ConvertToJson option

src/OpenTelemetry.Exporter.Geneva/GenevaExporterOptions.cs

@@ -88,12 +88,30 @@ public IReadOnlyDictionary<string, object> PrepopulatedFields
             var copy = new Dictionary<string, object>(value.Count + 1) { [Schema.V40.PartA.Ver] = schemaVersion };
             foreach (var entry in value)
             {
-                copy[entry.Key] = entry.Value; // shallow copy
+                var val = entry.Value;
+                switch (val)
+                {
+                    case bool vb:
+                    case byte vui8:
+                    case sbyte vi8:
+                    case short vi16:
+                    case ushort vui16:
+                    case int vi32:
+                    case uint vui32:
+                    case long vi64:
+                    case ulong vui64:
+                    case float vf:
+                    case double vd:
+                    case string vs:
+                        break;
+                    default:
+                        throw new ArgumentException($"Type: {entry.Value.GetType()} is not supported. Only bool, byte, sbyte, short, ushort, int, uint, long, ulong, float, double, and string are the supported types for PrepopulatedFields values.");
+                }
+
+                copy[entry.Key] = val; // shallow copy
             }
 
             this._fields = copy;
         }
     }
-
-    internal Func<object, string> ConvertToJson = obj => "ERROR: GenevaExporterOptions.ConvertToJson not configured.";
 }

src/OpenTelemetry.Exporter.Geneva/GenevaLogExporter.cs

@@ -46,7 +46,6 @@ public class GenevaLogExporter : GenevaBaseExporter<LogRecord>
     private readonly IDataTransport m_dataTransport;
     private readonly bool shouldPassThruTableMappings;
     private bool isDisposed;
-    private Func<object, string> convertToJson;
 
     public GenevaLogExporter(GenevaExporterOptions options)
     {
@@ -108,8 +107,6 @@ public GenevaLogExporter(GenevaExporterOptions options)
                 throw new ArgumentOutOfRangeException(nameof(connectionStringBuilder.Protocol));
         }
 
-        this.convertToJson = options.ConvertToJson;
-
         if (options.PrepopulatedFields != null)
         {
             this.m_prepopulatedFieldKeys = new List<string>();
@@ -288,26 +285,6 @@ internal int SerializeLogRecord(LogRecord logRecord)
             {
                 var key = this.m_prepopulatedFieldKeys[i];
                 var value = this.m_prepopulatedFields[key];
-                switch (value)
-                {
-                    case bool vb:
-                    case byte vui8:
-                    case sbyte vi8:
-                    case short vi16:
-                    case ushort vui16:
-                    case int vi32:
-                    case uint vui32:
-                    case long vi64:
-                    case ulong vui64:
-                    case float vf:
-                    case double vd:
-                    case string vs:
-                        break;
-                    default:
-                        value = this.convertToJson(value);
-                        break;
-                }
-
                 cursor = AddPartAField(buffer, cursor, key, value);
                 cntFields += 1;
             }

src/OpenTelemetry.Exporter.Geneva/GenevaTraceExporter.cs

@@ -142,26 +142,6 @@ public GenevaTraceExporter(GenevaExporterOptions options)
         foreach (var entry in options.PrepopulatedFields)
         {
             var value = entry.Value;
-            switch (value)
-            {
-                case bool vb:
-                case byte vui8:
-                case sbyte vi8:
-                case short vi16:
-                case ushort vui16:
-                case int vi32:
-                case uint vui32:
-                case long vi64:
-                case ulong vui64:
-                case float vf:
-                case double vd:
-                case string vs:
-                    break;
-                default:
-                    value = options.ConvertToJson(value);
-                    break;
-            }
-
             cursor = AddPartAField(buffer, cursor, entry.Key, value);
             this.m_cntPrepopulatedFields += 1;
         }

test/OpenTelemetry.Exporter.Geneva.Tests/GenevaTraceExporterTests.cs

@@ -53,6 +53,21 @@ public void GenevaTraceExporter_constructor_Invalid_Input()
                     ConnectionString = null,
                 });
             });
+
+            // unsupported types(char) for PrepopulatedFields
+            Assert.Throws<ArgumentException>(() =>
+            {
+                using var exporter = new GenevaTraceExporter(new GenevaExporterOptions
+                {
+                    ConnectionString = "EtwSession=OpenTelemetry",
+                    PrepopulatedFields = new Dictionary<string, object>
+                    {
+                        ["cloud.role"] = "BusyWorker",
+                        ["cloud.roleInstance"] = "CY1SCH030021417",
+                        ["cloud.roleVer"] = (char)106,
+                    },
+                });
+            });
         }
 
         [Fact]