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我正在编写一个需要向内置 T-SQL 编辑器发送命令的 Visual Studio 2012 加载项。有问题的命令 sqlEditorSqlDatabaseCommand 可用于设置或获取编辑器中当前数据库的名称。这是一些设置数据库名称的（工作）代码：

const string guidSqlEditorCommandSet = "b371c497-6d81-4b13-9db8-8e3e6abad0c3";
const int sqlEditorSqlDatabaseCommand = 0x312;

object customIn = "myDatabaseName";
object customOut = null;
m_applicationObject.Commands.Raise(guidSqlEditorCommandSet, sqlEditorSqlDatabaseCommand, ref customIn, ref customOut);

问题是，我需要获取当前数据库名称，这需要使用 customOut 参数，而且我不知道如何使 customOut 工作。

sqlEditorSqlDatabaseCommand 的实现如下（通过 Reflector）：

protected override int HandleExec(uint nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
{
    AuxiliaryDocData auxiliaryDocDataForEditor = base.GetAuxiliaryDocDataForEditor();
    if (auxiliaryDocDataForEditor != null)
    {
        QueryExecutor queryExecutor = auxiliaryDocDataForEditor.QueryExecutor;
        if (queryExecutor != null)
        {
            if (pvaIn != IntPtr.Zero)
            {
                string objectForNativeVariant = (string) Marshal.GetObjectForNativeVariant(pvaIn);
                this.SetDatabase(auxiliaryDocDataForEditor, objectForNativeVariant);
            }
            else if (pvaOut != IntPtr.Zero)
            {
                object database = string.Empty;
                IDbConnection connection = queryExecutor.ConnectionStrategy.Connection;
                if (((connection != null) && (connection.State == ConnectionState.Open)) && !string.IsNullOrEmpty(connection.Database))
                {
                    database = connection.Database;
                }
                else
                {
                    database = string.Empty;
                }
                Marshal.GetNativeVariantForObject(database, pvaOut);
            }
        }
    }
    return 0;
}

根据我见过的每个编组示例，我应该能够为 customIn 和 customOut 传递 null，并且数据库名称应该放在 customOut 中。当我这样做时，我从 Commands.Raise 中得到一个 E_INVALIDARG 异常：

System.ArgumentException: The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))
    at EnvDTE.Commands.Raise(String Guid, Int32 ID, Object& CustomIn, Object& CustomOut)
    at RDSVisualStudioAddIn.Exec(String commandName, vsCommandExecOption executeOption, Object& varIn, Object& varOut, Boolean& handled) in c:\RDS\RDSVisualStudioAddIn\Connect.cs:line 193

有没有人使用 Commands.Raise 和 customOut 参数？

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