Fixes arrays missing Item indexer resulting in NullReferenceException

Blazored · Sep 18, 2020 · b50b0ff · b50b0ff
1 parent 2fc8e1b
commit b50b0ff
Showing 1 changed file with 23 additions and 3 deletions.
diff --git a/src/Blazored.FluentValidation/EditContextFluentValidationExtensions.cs b/src/Blazored.FluentValidation/EditContextFluentValidationExtensions.cs
@@ -145,9 +145,29 @@ private static FieldIdentifier ToFieldIdentifier(EditContext editContext, string
                     // This code assumes C# conventions (one indexer named Item with one param)
                     nextToken = nextToken.Substring(0, nextToken.Length - 1);
                     var prop = obj.GetType().GetProperty("Item");
-                    var indexerType = prop.GetIndexParameters()[0].ParameterType;
-                    var indexerValue = Convert.ChangeType(nextToken, indexerType);
-                    newObj = prop.GetValue(obj, new object[] { indexerValue });
+
+                    if(null != prop)
+                    {
+                        // we've got an Item property
+                        var indexerType = prop.GetIndexParameters()[0].ParameterType;
+                        var indexerValue = Convert.ChangeType(nextToken, indexerType);
+                        newObj = prop.GetValue(obj, new object[] { indexerValue });                        
+                    }
+                    else
+                    {
+                        // If there is no Item property
+                        // Try to cast the object to array
+                        object[] array = obj as object[];
+                        if (array != null)
+                        {
+                            int indexerValue = Convert.ToInt32(nextToken);
+                            newObj = array[indexerValue];
+                        }
+                        else
+                        {
+                            throw new InvalidOperationException($"Could not find indexer on object of type {obj.GetType().FullName}.");
+                        }
+                    }
                 }
                 else
                 {