在实体框架中将SQL数据绑定到模型属性

Question

Good day to you. I am returning a result as preceding from SQL stored procedure.

Now I am binding the data as follows.

 List<EventPhotos> resList = null;
 resList = pe.Database.SqlQuery<EventPhotos>(sqlQuery, param).ToList();

Following is my model.

public partial class EventPhotos
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public EventPhotos()
        {

        }        

        public EventInfo EventInformation { get; set; }
        public ImageInfo ImageInformation { get; set; }

    }

    public class EventInfo
    {
        public string EventID { get; set; }

        public string EventName { get; set; }

        public bool IsJoint { get; set; }
    }
    public class ImageInfo
    {
        public string ImageID { get; set; }

        public string EventMediaFolder { get; set; }

        public string Image { get; set; }

        public string DateTime { get; set; }

        public string ImageDescription { get; set; }

        public string Action { get; set; }
    }

But when I run this, nothing gets mapped to my properties EventInformation and ImageInformation. Is there anyway to achieve this. I know this can be done if we use dataAdapter and assign names to the each table retrieved. But I want to use the Entity framework. Any help is appreciated. Thanks in advance.

Answer 1

Try and add the table and column attributes

public class EventInfo
{

    [Column(Name = "EventID")]
    public string EventID { get; set; }


    [Column(Name = "EventName")]
    public string EventName { get; set; }


    [Column(Name = "IsJoint")]
    public bool IsJoint { get; set; }
}
public class ImageInfo
{

    [Column(Name = "ImageID" )]
    public string ImageID { get; set; }


    [Column(Name = "EventMediaFolder")]
    public string EventMediaFolder { get; set; }


    [Column(Name = "Image")]
    public string Image { get; set; }


    [Column(Name = "DateTime")]
    public string DateTime { get; set; }


    [Column(Name = "ImageDescription")]
    public string ImageDescription { get; set; }


    [Column(Name = "Action")] 
    public string Action { get; set; }
}

I use the below code to do the mapping

 returnItems = context.ExecuteQuery<EventPhotos>(sql).ToList();

Answer 2

Database.SqlQuery :

Creates a raw SQL query that will return elements of the given type. The type can be any type that has properties that match the names of the columns returned from the query , or can be a simple primitive type. The type does not have to be an entity type. The results of this query are never tracked by the context even if the type of object returned is an entity type.

It means, that the column names of the resultset of your stored procedure must match with the names of properties defined in your POCO class EventPhotos . So you must create the class EventPhotos with exact names of the returned columns instead of adding two properties - the nested properties names cannot be found by the Database.SqlQuery method.

SqlQuery does not support complex types.

See a similar question here .