在Test Client（WCF）中测试时出现WCF ConfigurationErrorsException [英] WCF ConfigurationErrorsException when testing in Test Client (WCF)

问题描述

当我测试我的服务时（第一次），我得到以下例外：

 System.Configuration.ConfigurationErrorsException未被用户代码处理
 HResult = -2146232062 
消息=无法找到或加载已注册的.Net Framework数据提供程序。 
 Source = System.Data 
 BareMessage =无法找到或加载已注册的.Net Framework数据提供程序。 
 Line =  0  
 StackTrace：
 at System.Data.Common.DbProviderFactories.GetFactory（DataRow providerRow）
 at System.Data.EntityClient.EntityConnection.GetFactory（ String  providerString）
 at System.Data.EntityClient.EntityConnection.ChangeConnectionString（ String  newConnectionString）
 at System.Data.Objects.ObjectContext..ctor（ String  connectionString， String  defaultContainerName）
在ExamGeneratorDataModel.ExamEntities..ctor（）在 d：\ my documents \visual studio 2010 \ Projects\examgenerator\ExamGeneratorDataModel\ExamGeneratorModel.Designer.cs：line  46  
 at examgenerator.UserService.GetUser（ String  userName）在 d：\ my documents \visual studio 2010 \Projects\examgenerator\examgenerator\UserService.cs：line  31  
在examgenerator.UserService.Login（ String  userName， String  password）中的class =code-keyword> d：\ my documents \visual studio 2010 \Projects\examgenerator\examgenerator\UserService.cs：line  19  
在SyncInvokeLogin（对象，对象 []， Object  []）
（ Object 实例，对象 []输入，对象 []&输出）
在System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin（MessageRpc& rpc）
 InnerException：

在我的app文件中，我从我的数据模式中添加了一个连接字符串属性：

 <？  xml     version   =  1.0   编码  =  utf-8 < span class =code-summarycomment>  ？ >  
 <  配置 >  
 < b> <   connectionStrings  >  
 <   add    名称  =  ExamEntities    connectionString   =  metadata = res：/ /*/ExamGeneratorModel.csdl|res://*/ExamGeneratorModel.ssdl|res://*/ExamGeneratorModel.msl;provider=MySql.Data.MySqlClient;provider connection string =& quot; server = localhost; User Id = root;密码= 0000; Persist Security Info = True; database = exam& quot;    providerName   =  System.Data.EntityClient    /  >  
 <   / connectionStrings  >   
 <   system.web  >  
 <  编译    debug   =  true    /  >  
 <   / system.web  >  
 .. 
 .. 
 .. 

错误抛出我转移到此代码：

public ExamEntities（）： base （ name = ExamEntities， ExamEntities）
{
this .ContextOptions.LazyLoadingEnabled = true ;
OnContextCreated（）;
}

我尝试用Google搜索，甚至重新阅读John Sharp的Windows Communication Foundation 4 Step by Step我还没有发现这里可能有什么问题:-(。我甚至关闭了我的反病毒（什么？我非常绝望）： - ）

解决方案

发现解决方案。我没有添加：

使用MySql.Data.MySqlClient; 

< br $> b $ b不要怪我。我们都做到了。所有！ ; - ）

Hi,

When i test my service (for the first time), i get the following exception:

System.Configuration.ConfigurationErrorsException was unhandled by user code
  HResult=-2146232062
  Message=Failed to find or load the registered .Net Framework Data Provider.
  Source=System.Data
  BareMessage=Failed to find or load the registered .Net Framework Data Provider.
  Line=0
  StackTrace:
       at System.Data.Common.DbProviderFactories.GetFactory(DataRow providerRow)
       at System.Data.EntityClient.EntityConnection.GetFactory(String providerString)
       at System.Data.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString)
       at System.Data.Objects.ObjectContext..ctor(String connectionString, String defaultContainerName)
       at ExamGeneratorDataModel.ExamEntities..ctor() in d:\my documents\visual studio 2010\Projects\examgenerator\ExamGeneratorDataModel\ExamGeneratorModel.Designer.cs:line 46
       at examgenerator.UserService.GetUser(String userName) in d:\my documents\visual studio 2010\Projects\examgenerator\examgenerator\UserService.cs:line 31
       at examgenerator.UserService.Login(String userName, String password) in d:\my documents\visual studio 2010\Projects\examgenerator\examgenerator\UserService.cs:line 19
       at SyncInvokeLogin(Object , Object[] , Object[] )
       at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
       at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
  InnerException: 

In my app file, i have added a connection strings attribute as such from my data mode:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="ExamEntities" connectionString="metadata=res://*/ExamGeneratorModel.csdl|res://*/ExamGeneratorModel.ssdl|res://*/ExamGeneratorModel.msl;provider=MySql.Data.MySqlClient;provider connection string=&quot;server=localhost;User Id=root;password=0000;Persist Security Info=True;database=exam&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <system.web>
    <compilation debug="true" />
  </system.web>
..
..
..

The error is thrown an i am transfered to this code:

public ExamEntities() : base("name=ExamEntities", "ExamEntities")
       {
           this.ContextOptions.LazyLoadingEnabled = true;
           OnContextCreated();
       }

I have tried googling and even re-reading John Sharp's Windows Communication Foundation 4 Step by Step and i have not found what could be wrong with here :-( . I even turned off my anti-virus (what?.. I was very desperate) :-)

解决方案

Found the solution. I had not added:

using MySql.Data.MySqlClient;

Do not blame me. We have all done that. ALL! ;-)

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