C# — How to suppress “Set parameter LicenseID to value …” despite LogToConsole=0 and OutputFlag=0

Answered

Yuan Jiawei Yuan Jiawei

October 22, 2025 07:00

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Hello Gurobi Support Team,

I am trying to run Gurobi from C# with a fully silent console. Even after disabling all logging, I still see a single line printed:

Set parameter LicenseID to value 2705893 

Minimal reproducible snippet (C#/.NET):

 

using Gurobi; class Repro {    static void Main()    {        using var env = new GRBEnv();        // Disable all logging to console and log file        env.Set(GRB.IntParam.LogToConsole, 0);        env.Set(GRB.IntParam.OutputFlag, 0);        env.Set(GRB.StringParam.LogFile, "");        // Set license ID        env.Set(GRB.IntParam.LicenseID, 2705893);        // Create a model        using var m = new GRBModel(env);    } }

Observed behavior:
Despite the parameters above, the console prints:

 

Set parameter LicenseID to value 2705893 

No other output appears (which is desired).

Expected behavior:
No console output at all.

Related to

• .NET
• Log Files

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  Simranjit Kaur

  • Gurobi Staff

  October 24, 2025 03:00

  Hi Yuan,

  To suppress all Gurobi logging, including LicenseID information, you need to set the parameter OutputFlag or LogToConsole to 0 on an empty environment before it is started. 

  GRBEnv env = new GRBEnv(true);
  env.Set(GRB.IntParam.LogToConsole, 0);
  env.Set(GRB.IntParam.OutputFlag, 0);
  env.Start();

  I hope this helps!

  Best regards,
  Simran

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