How to get a method signature about dd-trace-dotnet

[lucaspimentel]

Hello, @wang9563. The method signature in method_replacements.target.signature is optional and only needed to distinguish between multiple method overloads. The only integration that currently uses this is the SQL Server integration, because we instrument two overloads of System.Data.SqlClient.SqlCommand.ExecuteReader():

• ExecuteReader(CommandBehavior, string)
• ExecuteReader(CommandBehavior)

For now, we only compare the calling convention (first byte) and the number of method parameters (second byte) in the signature to determine if a method call is a match (see this code). The rest of the signature is ignored because metadata tokens are not consistent between library versions.

In the future, we plan to replace the signature bytes with something more human-readable that includes the type names instead. For example:

"target": {
    "returnType": ["System.Data.SqlClient.SqlDataReader"],
    "parameterTypes": ["System.Data.CommandBehavior", "System.String"]
}

[xunki]

Thanks. This is great.
Also, This feature will be better. I will mind this.