[英]How to use ConnectionString with DbContext using Entity Framework code first?
[英]Entity Framework DBContext and dynamic ConnectionString
我想在Windows應用程序中使用EF 4動態建立連接。 嘗試Busar記錄時,出現錯誤: 不支持的關鍵字:'provider'。
代碼錯誤: var nota = db.NotasFiscais.Find(28406);
代碼如下
主要用途
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
NF.DataBase.Global.Conexao = new System.Data.EntityClient.EntityConnectionStringBuilder();
NF.DataBase.Global.Conexao.Provider = "System.Data.SqlClient";
NF.DataBase.Global.Conexao.ProviderConnectionString = "Data Source=source;Initial Catalog=base;User ID=sa; Password=pass;";
Application.Run(new Form1());
}
數據庫上下文
public class ERPContext : DbContext
{
public DbSet<NotasFiscais> NotasFiscais { get; set; }
public DbSet<NFEmissores> NFEmissores { get; set; }
public DbSet<Cidades> Cidades { get; set; }
public ERPContext()
: base(NF.DataBase.Global.Conexao.ToString())
{
Database.SetInitializer<ERPContext>(null);
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<NotasFiscais>().ToTable("NotasFiscais");
modelBuilder.Entity<NFEmissores>().ToTable("NFEmissores");
modelBuilder.Entity<Cidades>().ToTable("Cidades");
}
}
字型:
private void button1_Click(object sender, EventArgs e)
{
var db = new ERPContext();
var nota = db.NotasFiscais.Find(28406);
...
}
更改此:
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
NF.DataBase.Global.Conexao = new System.Data.EntityClient.EntityConnectionStringBuilder();
NF.DataBase.Global.Conexao.Provider = "System.Data.SqlClient";
NF.DataBase.Global.Conexao.ProviderConnectionString = "Data Source=source;Initial Catalog=base;User ID=user; Password=pass;";
對於:
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
NF.DataBase.Global.Conexao = new System.Data.EntityClient.EntityConnectionStringBuilder();
// not provider
NF.DataBase.Global.Conexao.ProviderConnectionString = "Data Source=source;Initial Catalog=base;User ID=user; Password=pass;";
資料來源:
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