IQueryable query = from x in appEntities
                   where x.id = 32
                   select x;
var queryString = query.ToString();

将返回sql查询。使用EntityFramework的数据上下文进行工作

在EF 4.1中可以执行以下操作:

var result = from x in appEntities
             where x.id = 32
             select x;

System.Diagnostics.Trace.WriteLine(result .ToString());

这将为您提供生成的SQL。

如果您还想拥有参数值(不仅是@p_linq_0，而且还有它们的值)，您可以使用IDbCommandInterceptor并向ReaderExecuted方法添加一些日志记录。

我正在做集成测试，需要在实体框架核心2.1中调试生成的SQL语句，所以我使用DebugLoggerProvider或ConsoleLoggerProvider，如下所示:

[Fact]
public async Task MyAwesomeTest
    {
        //setup log to debug sql queries
        var loggerFactory = new LoggerFactory();
        loggerFactory.AddProvider(new DebugLoggerProvider());
        loggerFactory.AddProvider(new ConsoleLoggerProvider(new ConsoleLoggerSettings()));

        var builder = new DbContextOptionsBuilder<DbContext>();
        builder
            .UseSqlServer("my connection string") //"Server=.;Initial Catalog=TestDb;Integrated Security=True"
            .UseLoggerFactory(loggerFactory);

        var dbContext = new DbContext(builder.Options);

        ........

下面是Visual Studio控制台的输出示例:

EF Core 5.0+

这个期待已久的功能在EF Core 5.0中可用!这是每周的状态更新:

var query = context.Set<Customer>().Where(c => c.City == city); Console.WriteLine(query.ToQueryString()) results in this output when using the SQL Server database provider: DECLARE p0 nvarchar(4000) = N'London'; SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region] FROM [Customers] AS [c] WHERE [c].[City] = @__city_0 Notice that declarations for parameters of the correct type are also included in the output. This allows copy/pasting to SQL Server Management Studio, or similar tools, such that the query can be executed for debugging/analysis.

哦吼! !

(注意:你需要使用Microsoft.EntityFrameworkCore;)

如果您正在使用DbContext，您可以执行以下操作来获取SQL:

var result = from i in myContext.appEntities
             select new Model
             {
                 field = i.stuff,
             };
var sql = result.ToString();