如何设置定义文件以在 Azure 函数中使用 LINQ？

Question

我创建了一个连接到 Azure SQL 数据库并执行直接 SQL 命令的 Azure 函数。现在我想改用 LINQ。我使用 Visual Studios 创建了定义文件，但我不确定如何在上传到函数后引用定义文件。下面的代码出现错误：

error CS1061: 'SqlConnection' does not contain a definition for 'Customers' and no extension method 'Customers' accepting a first argument of type 'SqlConnection' could be found (are you missing a using directive or an assembly reference?)

这是我的 Azure 函数代码：

using System.Net;
using Dapper;
using System.Data.SqlClient;
using System.Configuration;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
    log.Info($"C# HTTP trigger function processed a request. RequestUri={req.RequestUri}");

    var cnnString  = ConfigurationManager.ConnectionStrings["SqlConnection"].ConnectionString;
    var connection = new SqlConnection(cnnString);

    var result = from r in connection.Customers select r;

    foreach (var r in result)
    {
        log.Info(r.squid);
    }

    log.Info("Log added to database successfully!");

    return req.CreateResponse(HttpStatusCode.OK);
}

Answer 1

您可以使用#load 加载另一个class。您可以使用代码底部的 view files Link 创建新文件 window

Run.csx 文件

#r "System.Data.Linq"
#load "TodoItem.csx"

using System.Net;
using System.Data.Linq;
using System.Data.Linq.Mapping;
using System.Configuration;

public static void Run(string input, TraceWriter log)
{        
    var cnnString  = ConfigurationManager.ConnectionStrings["MS_TableConnectionString"].ConnectionString;
    DataContext db = new DataContext(cnnString);     
    Table<todoItem> todoItems = db.GetTable<todoItem>();        
    IQueryable<todoItem> itemQuery = from todoItem in todoItems select todoItem;

    foreach (todoItem item in itemQuery)
    {
        log.Info($"ID={item.id}, Text={item.text}");
    }

    return;
}

TodoItem.csx 文件

#r "System.Data.Linq"
#r "System.Data"

using System.Data.Linq.Mapping;
using System.Data;

[Table(Name = "TodoItem")]
public class todoItem
{
    private string _id;
    [Column(IsPrimaryKey=true, Storage="_id")]
    public string id
    {
        get
        {
            return this._id;
        }
        set
        {
            this._id = value;
        }

    }

    private string _text;
    [Column(Storage="_text")]
    public string text
    {
        get
        {
            return this._text;
        }
        set
        {
            this._text=value;
        }
    }
}

如何设置定义文件以在 Azure 函数中使用 LINQ？

How to setup the definition file to use LINQ in an Azure Function?

c#

linq

azure-sql-database

azure-functions