與Lambda和EF

Question

全部選擇我的這個選擇所有城市：

ExecuteStoreCommand<MCT_DBEntities>("select * from cities", ConnectionResolver.DB_Connection); 

現在我試圖將轉換爲LAMBDA，但我怎麼告訴它SELECT *？

GetWithExpression<city, MCT_DBEntities>(u => u.SelectMany, ConnectionResolver.DB_Connection); 

編輯：

private static TValue RetryGetWithExpression<U,T, TValue>(Func<ObjectSet<T>, TValue> func, String connection, Int32 retryInfiniteLoopGuard = 0) 
     where T : class 
     where U : ObjectContext 
    { 
     Microsoft.Practices.TransientFaultHandling.RetryPolicy policy = RetryPolicyProvider.GetSqlAzureRetryPolicy(); 

     using (U entitiesContext = (U)Activator.CreateInstance(typeof(U), new[] { connection })) 
     {...} 

Answer 1

如果你的第一個參數是Expression<Func<T, bool>>你可能想：

RetryGetWithExpression<city, MCT_DBEntities>(_ => true, ConnectionResolver.DB_Connection); 

編輯。 這應該工作：

RetryGetWithExpression<MCT_DBEntities, city, IQueryable<city>>(x => x.Select(y => y), 
             ConnectionResolver.DB_Connection); 

Answer 2

你試過

GetWithExpression<city, MCT_DBEntities>(u => u.Select(), ConnectionResolver.DB_Connection);