Question

实体框架（6+）是否具有活动回调机制，因为我想绑定一些函数以了解实体框架在做什么。例如“发出查询”或“从SQL Server下载”等。这类似于“日志”功能，您可以在日志记录调试信息时将其绑定到该功能。如果确实存在，则不能完全确定该功能是什么，或者我需要如何在我的应用程序中实现它。

Answer 1

您可以使用IDbCommandInterceptor记录由您的实体框架上下文执行的所有活动。您可以这样实现：

EFCommandInterceptor.cs

class EFCommandInterceptor: IDbCommandInterceptor
{
    public void NonQueryExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
    {
        LogInfo("NonQueryExecuted", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText));
    }

    public void NonQueryExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
    {
        LogInfo("NonQueryExecuting", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync,  command.CommandText));
    }

    public void ReaderExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext)
    {
        LogInfo("ReaderExecuted", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText));
    }

    public void ReaderExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext)
    {
        LogInfo("ReaderExecuting", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText));
    }

    public void ScalarExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
    {
        LogInfo("ScalarExecuted", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText));
    }

    public void ScalarExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
    {
        LogInfo("ScalarExecuting", String.Format(" IsAsync: {0}, Command Text: {1}", interceptionContext.IsAsync, command.CommandText));
    }

    private void LogInfo(string command, string commandText)
    {
        Console.WriteLine("Intercepted on: {0} :- {1} ", command, commandText);
    }
}

然后在您的配置文件中进行配置

<entityFramework>
    <interceptors>
        <interceptor type="EF6DBFirstTutorials.EFCommandInterceptor, EF6DBFirstTutorials">
        </interceptor>
    </interceptors>
</entityFramework>

请检查this page以获得更多详细信息。

实体框架活动回调

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