實體框架4.1 - EFTracingProvider

Question

有沒有辦法使EFTracing provider與EF 4.1一起工作？

EFTracing似乎需要一個objectcontext，我使用dbcontext。

在此先感謝！

Answer 1

是的，你可以。我將community version與數據庫優先DbContexts和代碼優先DbContexts結合使用。此答案基於項目網站上的discussion thread。

對於數據庫一/設計師DbContexts（通過ADO.NET DbContext Generator templates），你可以簡單地添加下面的構造：

public abstract class MyDbContext : DbContext 
{ 
    protected MyDbContext(string nameOrConnectionString) 
     : base(EFTracingProviderUtils.CreateTracedEntityConnection(nameOrConnectionString), true) 
    { 
     // enable sql tracing 
     ((IObjectContextAdapter) this).ObjectContext.EnableTracing(); 
    } 
} 

對於代碼，因爲EFTracingProvider想要一個完整的實體連接字符串第一DbContexts它有點複雜。您必須手動創建EFTracingConnection實例。以下示例將適用於數據庫優先和代碼優先上下文。

public abstract class MyDbContext : DbContext 
{ 
    protected MyDbContext(string nameOrConnectionString) 
     : base(CreateTracingConnection(nameOrConnectionString), true) 
    { 
     // enable sql tracing 
     ((IObjectContextAdapter) this).ObjectContext.EnableTracing(); 
    } 

    private static DbConnection CreateTracingConnection(string nameOrConnectionString) 
    { 
     try 
     { 
      // this only supports entity connection strings http://msdn.microsoft.com/en-us/library/cc716756.aspx 
      return EFTracingProviderUtils.CreateTracedEntityConnection(nameOrConnectionString); 
     } 
     catch (ArgumentException) 
     { 
      // an invalid entity connection string is assumed to be a normal connection string name or connection string (Code First) 

      ConnectionStringSettings connectionStringSetting = 
       ConfigurationManager.ConnectionStrings[nameOrConnectionString]; 
      string connectionString; 
      string providerName; 

      if (connectionStringSetting != null) 
      { 
       connectionString = connectionStringSetting.ConnectionString; 
       providerName = connectionStringSetting.ProviderName; 
      } 
      else 
      { 
       providerName = "System.Data.SqlClient"; 
       connectionString = nameOrConnectionString; 
      } 

      return CreateTracingConnection(connectionString, providerName); 
     } 
    } 

    private static EFTracingConnection CreateTracingConnection(string connectionString, string providerInvariantName) 
    { 
     // based on the example at http://jkowalski.com/2010/04/23/logging-sql-statements-in-entity-frameworkcode-first/ 
     string wrapperConnectionString = 
      String.Format(@"wrappedProvider={0};{1}", providerInvariantName, connectionString); 

     EFTracingConnection connection = 
      new EFTracingConnection 
       { 
        ConnectionString = wrapperConnectionString 
       }; 

     return connection; 
    } 
} 

Answer 2

如果您正在使用的DbContext和MVC模型首先，使用EntityConnections然後將下面的示例代碼應該是意味着你需要：

public partial class BrickHouseFitnessContext : DbContext 
{ 

    public BrickHouseFitnessContext(): base(EntityConnectionWrapperUtils.CreateEntityConnectionWithWrappers(ConfigurationManager.ConnectionStrings["BrickHouseFitnessContext"].ConnectionString, "EFTracingProvider"), true) 
    { 
    } 

另外：

在web.config文件添加以下部分：

<system.data> 
<DbProviderFactories> 
    <add name="EF Tracing Data Provider" invariant="EFTracingProvider" description="Tracing Provider Wrapper" type="EFTracingProvider.EFTracingProviderFactory, EFTracingProvider, Version=1.0.0.0, Culture=neutral, PublicKeyToken=def642f226e0e59b" /> 
    <add name="EF Generic Provider Wrapper" invariant="EFProviderWrapper" description="Generic Provider Wrapper" type="EFProviderWrapperToolkit.EFProviderWrapperFactory, EFProviderWrapperToolkit, Version=1.0.0.0, Culture=neutral, PublicKeyToken=def642f226e0e59b" /> 
</DbProviderFactories> 

和：

<add key="EFTracingProvider.logToConsole" value="true" /> 
<add key="EFTracingProvider.logToFile" value="C:\BrickHouseFitnessSqlLog.txt" /> 

有沒有必要列入ExtendedEntities還是原來的文章中提到的其他的ObjectContext派生類。運行該代碼，您應該看到指定的日誌文件，其中包含所有SQL命令。當啓用跟蹤時，我繞過數據庫初始化，

Answer 3

雖然以前的答案有效，但我發現它們存在問題，更簡單的解決方案是使用NuGet中的Clutch.Diagnostics.EntityFramework軟件包，該軟件包在後臺使用MiniProfiler。與EFTracingProvider相比，獲得工作要簡單得多，而且更靈活的解決方案。

該項目在GitHub上的https://github.com/Kukkimonsuta/Clutch

對於EFTracingProvider一樣的功能安裝的NuGet包，然後實現IDbTracingListener這樣的：

using System; 
using System.Data.Common; 
using System.Diagnostics; 
using Clutch.Diagnostics.EntityFramework; 

/// <summary> 
/// 
/// </summary> 
public class DbTracingListener : IDbTracingListener 
{ 
    /// <summary> 
    /// 
    /// </summary> 
    /// <param name="connection"></param> 
    /// <param name="command"></param> 
    /// <param name="result"></param> 
    /// <param name="duration"></param> 
    public void CommandExecuted(DbConnection connection, DbCommand command, object result, TimeSpan duration) 
    { 
     Debug.WriteLine(command.CommandText); 
     Debug.WriteLine(string.Format("Executed in: {0}", duration)); 
    } 

    /// <summary> 
    /// 
    /// </summary> 
    /// <param name="connection"></param> 
    /// <param name="command"></param> 
    public void CommandExecuting(DbConnection connection, DbCommand command) 
    { 

    } 

    /// <summary> 
    /// 
    /// </summary> 
    /// <param name="connection"></param> 
    /// <param name="command"></param> 
    /// <param name="exception"></param> 
    /// <param name="duration"></param> 
    public void CommandFailed(DbConnection connection, DbCommand command, Exception exception, TimeSpan duration) 
    { 

    } 

    /// <summary> 
    /// 
    /// </summary> 
    /// <param name="connection"></param> 
    /// <param name="command"></param> 
    /// <param name="result"></param> 
    /// <param name="duration"></param> 
    public void CommandFinished(DbConnection connection, DbCommand command, object result, TimeSpan duration) 
    { 

    } 
}