学习笔记

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EF添加视图主键问题解决方法：不要用全连连

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linqToSql基类：

  public class DataBaseContext : DataContext

    {

        private static string GetConnectionString

        {

            get

            {

                return Properties.Settings.Default.Maji_AnjianConnectionString;

            }

        }

        public DataBaseContext():base(GetConnectionString)

        {

        }

public class BaseDal:DataBaseContext where T : class,new()    {        #region 增加        public string Add(T info)        {            try            {                              // DataModelDataContext dc = new DataModelDataContext(ConnHelper.GetConnStr);                              this.GetTable().InsertOnSubmit(info);

                this.SubmitChanges(); //执行插入操作

                return "ok";

            }

            catch (Exception e)

            {

                return e.ToString();

            }

        }

}

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//与12个月相关联

var dataResult = from month in periodMonth

join itm in data1 on month equals itm.Month

into allMonth

from m in allMonth.DefaultIfEmpty() //左连接如果itm没有数据，必须用data=m==null?0:m.filed

select new

{

// CarCode = m == null ? "" : m.CarCode,

Month = month,

LastKilo = m == null ? 0 : m.LastKilo,

Kilometers = m == null ? 0 : m.Kilometers,

Quantity = m == null ? 0 : m.Quantity,

Amount = m == null ? 0 : m.Amount,

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查看iis里的进程

iisapp -a

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vs2013 支持.net4.6  需要安装，Microsoft .NET Framework 4.6 Targeting Pack，网址：  https://www.microsoft.com/en-us/download/details.aspx?id=48136