dotnet data_error ai_generated true

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

ID: dotnet/ef-core-value-conversion-failure

Also available as: JSON · Markdown · 中文
88%Fix Rate
84%Confidence
1Evidence
2023-11-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Entity Framework Core 6.0.x active — — —
Entity Framework Core 7.0.x active — — —
Entity Framework Core 8.0.x active — — —

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.

generic

中文

Entity Framework Core 的值转换器在查询或保存期间失败，因为 CLR 类型和数据库类型之间的转换逻辑不正确或引发了未处理的异常。

Official Documentation

https://learn.microsoft.com/en-us/ef/core/modeling/value-conversions?view=efcore-8.0

Workarounds

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

中文步骤

  1. 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.
  3. Use a custom ValueConverter class that logs or handles exceptions gracefully during conversion.

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Removing the value conversion entirely changes data type semantics and may break existing data.

  2. 90% fail

    Using a generic ValueConverter without proper null handling causes NullReferenceException.

  3. 85% fail

    Changing the database column type without migration leads to data truncation or errors.