Dapper: Execute a command multiple times and linq and ToArray

问题

According to the dapper docs one can write

connection.Execute(@"insert into MyTable(colA, colB) values (@a, @b)",
    new[] { new { a=1, b=1 }, new { a=2, b=2 }, new { a=3, b=3 } }
    )

I tried using

conn.Execute(
    @"
    insert into RelRoleUser ( RoleID, UserID )
    values( @roleID, @userID )",
    userroleList.Select(r => new { roleID = r.roleID, userID = r.userID }).ToArray(),
    null, null, null);

But get an exception "Invalid type owner for DynamicMethod" in Dapper code

private static Action<IDbCommand, object> CreateParamInfoGenerator(Type type)
    {
    var dm = new DynamicMethod(string.Format("ParamInfo{0}", Guid.NewGuid()), null,     new[] { typeof(IDbCommand), typeof(object) }, type, true);
    ...

Am I trying to write too clever code or have I misunderstood something else? Stumbled upon a bug?

I am running Dotnet3.5 on Win7.

来源：https://stackoverflow.com/questions/8705325/dapper-execute-a-command-multiple-times-and-linq-and-toarray