C#: Unhandled exception. System.TypeLoadException: Could not load type 'System.Drawing.Color'

Question

ANSWER for this question thanks to Jeremy C.:

There is no KeePass nuget package for the Net5.0 yet. Thats why there is that error message. Thanks Jeremy C. for the help and answers.

QUESTION:

Im getting this error after starting my solution.

Unhandled exception. System.TypeLoadException: Could not load type 'System.Drawing.Color' from assembly 'Splat, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null'.

Already used google and tried to find a fix for it and also red all articles about similiar errors like "System.Drawing.Font" or "System.Drawing.Image". But theres nothing really helpful and nothing really informative about 'System.Drawing.Color'.

Ive got the code example and package from here: github.com/wismna/ModernKeePassLib

This is my code:

.csproj

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="ModernKeePassLib" Version="2.45.1" />
    <PackageReference Include="System.Drawing.Common" Version="5.0.2" />
  </ItemGroup>

</Project>

And:

using ModernKeePassLib;
using ModernKeePassLib.Interfaces;
using ModernKeePassLib.Keys;
using ModernKeePassLib.Serialization;
using System;
using System.Linq;
using System.Text;

namespace KeePasso
{
    class Program
    {
        static void Main()
        {

            var dbpath = @"C:\Users\prusinma\Desktop\KeePassDatabase\Database.kdbx";
            var keypath = @"C:\Users\prusinma\Desktop\KeePassDatabase\Database.key";
            var masterpw = "1234abcd";

            Console.WriteLine("init done");

            byte[] DBPathBytes = Encoding.ASCII.GetBytes(dbpath);
            byte[] KeyPathBytes = Encoding.ASCII.GetBytes(keypath);

            var ioConnection = IOConnectionInfo.FromByteArray(DBPathBytes);

            var compositeKey = new CompositeKey();
            compositeKey.AddUserKey(new KcpPassword(masterpw)); // Password
            compositeKey.AddUserKey(new KcpKeyFile(IOConnectionInfo.FromByteArray(KeyPathBytes))); // Keyfile

            var db = new PwDatabase();
            db.Open(ioConnection, compositeKey, new NullStatusLogger());

            var kpdata = from entry in db.RootGroup.GetEntries(true)
                         select new
                         {
                             Group = entry.ParentGroup.Name,
                             Title = entry.Strings.ReadSafe("Title"),
                             Username = entry.Strings.ReadSafe("UserName"),
                             Password = entry.Strings.ReadSafe("Password"),
                             URL = entry.Strings.ReadSafe("URL"),
                             Notes = entry.Strings.ReadSafe("Notes")
                         };

            db.Save(new NullStatusLogger());
            var contents = db.IOConnectionInfo.Bytes;

            string bitString = BitConverter.ToString(contents);
            Console.WriteLine(bitString);

            Console.WriteLine(kpdata.ToString());
        }
    }
}

Answer 1

Those classes were moved into their own nuget package. Add it to your project and you should be good to go: https://www.nuget.org/packages/System.Drawing.Common/

From the project directory at the command line:

dotnet add package System.Drawing.Common

---

Closer inspection reveals ModernKeepPass targets.netstandard1.2 and will not work with 5's System.Drawing nuget package without being upgraded to target the new framework.

https://github.com/wismna/ModernKeePassLib/blob/master/ModernKeePassLib/ModernKeePassLib.csproj

<PropertyGroup>
  <TargetFramework>netstandard1.2</TargetFramework>