///DataContextDataContext ctx=newDataContext(ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);Table<Customer>Customers=ctx.GetTable<Customer>();varCus=from cinCustomers where c.CustomerID.
publicNorthwindDataContext(stringconnection) :base(connection) { } } 强类型数据上下文使代码更简洁: NorthwindDataContextctx =newNorthwindDataContext("server=xxx;database=Northwind;uid=xxx;pwd=xxx"); GridView1.DataSource =fromcinctx.Customerswherec.CustomerID.StartsWith("A")selectnew{顾客ID = c.Custom...
1publicclassCountryDataContext : DataContext2{3public CountryDataContext(stringconnectionString)4 :base(connectionString)5{6}78public Table<Country>Countries9{10get11{12returnthis.GetTable<Country>();13}14}1516public Table<City>Cities17{18get19{20returnthis.GetTable<City>();21}22}23 } 3、怎么使...
DataContext ctx = new DataContext(ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString); Table<Customer> Customers = ctx.GetTable<Customer>(); var Cus=from c in Customers where c.CustomerID.StartsWith("A") select new {顾客ID=c.CustomerID, 顾客名=c.Name, 城市=c.City}; foreach...
stringconnString =@"Data Source=.\SQLEXPRESS;AttachDbFilename=c:\northwind.mdf; Integrated Security=True; Connect Timeout=30; User Instance=True"; SqlConnection nwindConn =newSqlConnection(connString); nwindConn.Open(); Northwnd interop_db =newNorthwnd(nwindCon...
(2)DataContext构造函数必须调用base(connectionString) 构造函数(基类构造函数) (3)DataContext通过类型Table<TEntity>(例:Table<City>)的属性来显示数据库上的表。这个表类实现IQueriable<TEntity>,并且让你能够编写LINQ查询来查询数据库。 2、怎么创建DataContext ...
public NorthwindDataContext(string connection) : base(connection) { } } 强类型数据上下文使代码更简洁 NorthwindDataContext ctx = new NorthwindDataContext("server=xxx;database=Northwind;uid=xxx;pwd=xxx"); GridView1.DataSource = from c in ctx.Customers where c.CustomerID.StartsWith("A") select new...
public NewCreateDB(System.Data.IDbConnection connection) : base(connection) { } } [Table(Name = "Person")] public partial class Person : System.ComponentModel.INotifyPropertyChanged { private int _PersonID; private string _PersonName; private System.Nullable<int> _Age; ...
DimconString ="Data Source=.\SQLEXPRESS;AttachDbFilename=c:\northwind.mdf; Integrated Security=True;Connect Timeout=30;User Instance=True"DimnorthwindCon =NewSqlConnection(conString) northwindCon.Open()Dimdb =NewNorthwnd("...")DimnorthwindTransaction = northwindCon.BeginTransaction()TryDimcmd =New...
publicNorthwindDataContext(stringconnection) :base(connection) { } } 强类型数据上下文使代码更简洁: NorthwindDataContext ctx =newNorthwindDataContext("server=xxx;database=Northwind;uid=xxx;pwd=xxx"); GridView1.DataSource = from cinctx.Customers where c.CustomerID.StartsWith("A") selectnew{顾客ID =...