# System.InvalidOperationException: The value converter for property 'PropertyName' threw an exception. See inner exception for details.

- **ID:** `dotnet/ef-core-value-conversion-failure`
- **Domain:** dotnet
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 88%

## Root Cause

Entity Framework Core's value converter fails during query or save because the conversion logic between CLR type and database type is incorrect or throws an unhandled exception.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Entity Framework Core 6.0.x | active | — | — |
| Entity Framework Core 7.0.x | active | — | — |
| Entity Framework Core 8.0.x | active | — | — |

## Workarounds

1. **Inspect the inner exception to identify the exact conversion failure (e.g., FormatException, NullReferenceException).** (90% success)
   ```
   Inspect the inner exception to identify the exact conversion failure (e.g., FormatException, NullReferenceException).
   ```
2. **Implement a robust value converter with null checks and error handling, then register it via HasConversion.** (88% success)
   ```
   Implement a robust value converter with null checks and error handling, then register it via HasConversion.
   ```
3. **Use a custom ValueConverter class that logs or handles exceptions gracefully during conversion.** (80% success)
   ```
   Use a custom ValueConverter class that logs or handles exceptions gracefully during conversion.
   ```

## Dead Ends

- **** — Removing the value conversion entirely changes data type semantics and may break existing data. (95% fail)
- **** — Using a generic ValueConverter without proper null handling causes NullReferenceException. (90% fail)
- **** — Changing the database column type without migration leads to data truncation or errors. (85% fail)