There is something fishy in Sandard/Core versions of MySQL.Data.dll
Posted by: Tuomas Hietanen
Date: October 06, 2017 11:30AM

.NET versions of 6.9.9 and 6.10.3-rc seems to work well. But there is something fishy in .NET CORE / STANDARD versions of 6.10.3-rc and 8.0.9 dmr.

I got constantly errors:

 Derived types must either match the security accessibility of the base type or be less accessible.

Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlCommand'. 
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlConnection'. 
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlDataReader'.
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlException'. 
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlParameter'. 
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlParameterCollection'. 
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlClientFactory'.
Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlConnectionStringBuilder'.


To reproduce, here is a little sample program:

using System;

namespace ConsoleApp4
{
	class Program
	{
		//Add first a reference to System.Data.Common.dll

		static void Main(string[] args)
		{
			var pathToDll = @"C:\source\lib\netstandard1.3\MySql.Data.dll";
			var assembly = System.Reflection.Assembly.LoadFrom(pathToDll);
			try
			{
				//Crash:
				var types = assembly.GetTypes();
			}
			catch (System.Reflection.ReflectionTypeLoadException e)
			{
				foreach(var ex in e.LoaderExceptions)
				{
					Console.WriteLine(ex.Message);
				}
			}
			Console.ReadLine();
		}

	}
}

As said earlier, the previous versions don't have this error. But I would like to use .NET Standard / .NET Core.
I expect this is related to [assembly: AllowPartiallyTrustedCallers] and changed assembly.SecurityRuleSet.

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There is something fishy in Sandard/Core versions of MySQL.Data.dll
October 06, 2017 11:30AM


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