[轉]Lost parameter value during SQL trace in EF Core DbParameter 為 問號 ?

本文轉自：https://stackoverflow.com/questions/44202478/lost-parameter-value-during-sql-trace-in-ef-core

問：

I have implemented an approach for tracing SQL queries from EF Core according to this article: https://docs.microsoft.com/en-us/ef/core/miscellaneous/logging.

And have problems with tracing query parameteres.

When I recive Log event in all values of DbParameterLogData

I see only the question mark instead of the actual values wich I passed to the query. Example image VS 2015. Thank you!

答：

This is the default behavior of EF Core (filling up the DbParameterLogData.Value property with "?").

In order to get the real parameter values, you need to enable sensitive data logging by using DbContextOptionsBuilder.EnableSensitiveDataLogging method:

Enables application data to be included in exception messages, logging, etc. This can include the values assigned to properties of your entity instances, parameter values for commands being sent to the database, and other such data. You should only enable this flag if you have the appropriate security measures in place based on the sensitivity of this data.

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    optionsBuilder.EnableSensitiveDataLogging();
    // ...
}

Sometimes this results in a MissingMethodException.

In which case, you should call it in ConfigureServices():

services.AddDbContext<MyDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("Defa‌​ultConnection")).Ena‌​bleSensitiveDataLogg‌​ing()) – yfisaqt Jul 6 at 21:10