無法加載自定義ADO.NET提供了NHibernate的

Question

我使用Devart Postgres的驅動程序與NHibernate的Ado.net提供商。由於NHibernate不支持Devart Postgres驅動程序，我寫了一個基於ReflectionBasedDriver的自定義驅動程序類。下面是代碼：

namespace PostgresDriver.DbDriver 
{ 
    class DevartPgDriver : ReflectionBasedDriver 
    { 
     public DevartPgDriver() 
      : base(
      "Devart.Data.PostgreSql", 
      "Devart.Data.PostgreSql.PgSqlConnection", 
      "Devart.Data.PostgreSql.PgSqlCommand") 
     { 
     } 

     public override string NamedPrefix 
     { 
      get { return ":"; } 
     } 

     public override bool UseNamedPrefixInParameter 
     { 
      get { return true; } 
     } 

     public override bool UseNamedPrefixInSql 
     { 
      get { return true; } 
     } 

     public override bool SupportsMultipleOpenReaders 
     { 
      get { return false; } 
     } 

     protected override bool SupportsPreparingCommands 
     { 
      get { return true; } 
     } 

     public override IResultSetsCommand GetResultSetsCommand(NHibernate.Engine.ISessionImplementor session) 
     { 
      return new BasicResultSetsCommand(session); 
     } 

     public override bool SupportsMultipleQueries 
     { 
      get { return true; } 
     } 

     protected override void InitializeParameter(IDbDataParameter dbParam, string name, NHibernate.SqlTypes.SqlType sqlType) 
     { 
      base.InitializeParameter(dbParam, name, sqlType); 

      // Since the .NET currency type has 4 decimal places, we use a decimal type in PostgreSQL instead of its native 2 decimal currency type. 
      if (sqlType.DbType == DbType.Currency) 
       dbParam.DbType = DbType.Decimal; 
     } 
    } 
} 

我已經加入Devart.Data和Devart.Data.PostgreSql DLL文件在我的解決方案，並設置「複製本地」屬性設置爲True引用。我還添加了App.Config中的以下部分：

<runtime> 
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> 
     <qualifyAssembly partialName="Devart.Data.PostgreSql" 
      fullName="Devart.Data.PostgreSql, Version=7.2.80.0, Culture=neutral, PublicKeyToken=09af7300eec23701"> 
     </qualifyAssembly> 
    </assemblyBinding> 
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> 
     <qualifyAssembly partialName="Devart.Data" 
      fullName="Devart.Data, Version=5.0.872.0, Culture=neutral, PublicKeyToken=09af7300eec23701"> 
     </qualifyAssembly> 
    </assemblyBinding> 
    </runtime> 

這裏是我的hibernate.cfg.xml：

<session-factory name="NHSessionFactory"> 
    <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property> 
    <property name="connection.driver_class">PostgresDriver.DbDriver.DevartPgDriver, Devart.Data.PostgreSql</property> 
    <property name="dialect">NHibernate.Dialect.PostgreSQL82Dialect</property> 
    <property name="connection.connection_string">User Id=***;Password=***;Host=localhost;Port=5433;Database=***;</property> 
    <property name="show_sql">true</property>  
    <property name="format_sql">true</property 
    </session-factory> 

當我打電話sessionFactory = cfg.BuildSessionFactory();我得到以下錯誤："Could not load type 'PostgresDriver.DbDriver.DevartPgDriver' from assembly 'Devart.Data.PostgreSql, Version=7.2.80.0, Culture=neutral, PublicKeyToken=09af7300eec23701'."

當我嘗試實例化驅動程序類DevartPgDriver dr = new DevartPgDriver();時，我得到靜態成員下的錯誤：

NHibernate.Driver.ReflectionBasedDriver.ReflectionTypedProviderExceptionMessageTemplate 
"The IDbCommand and IDbConnection implementation in the assembly {0} could not be found. Ensure that the assembly {0} is located in the application directory or in the Global Assembly Cache. If the assembly is in the GAC, use <qualifyAssembly/> element in the application configuration file to specify the full name of the assembly." 

我錯過了什麼？我已經解決了這個問題幾個小時沒有太多成功。請幫忙！

Answer 1

幾個小時的反覆試驗後，我能解決問題：

相反的：

public DevartPgDriver() 
     : base(
     "Devart.Data.PostgreSql", 
     "Devart.Data.PostgreSql.PgSqlConnection", 
     "Devart.Data.PostgreSql.PgSqlCommand") 
    { 
    } 

它應該是：

public DevartPgDriver() 
     : base(
     "Devart.Data.PostgreSql", 
     "Devart.Data.PostgreSql", 
     "PgSqlConnection", 
     "PgSqlCommand") 
    { 
    } 

我還添加了nhProperties.Add(NHibernate.Cfg.Environment.Hbm2ddlKeyWords, "none");到nHibernate配置。感謝Rippo的指導。

Answer 2

我們已經回答了你的Devart論壇：http://forums.devart.com/viewtopic.php?f=3&t=28844。