[英]Entity Framework changing connection string with c#
我有一個應用程序,連接字符串根據每個用戶和計算機而變化。 那就是說我做了一個測試連接字符串只是為了進行測試。 然后,一旦工作,我將添加動態連接字符串。
經過一些研究,我發現連接字符串有問題。
如果有人可以告訴我我錯了,我將不勝感激。
var s = @"metadata=res://*/ProcurementModel.csdl|res://*/ProcurementModel.ssdl|
res://*/ProcurementModel.msl;provider=System.Data.SqlClient;
provider connection string=&';data source=JAMES-DESKTOP\SQLEXPRESS;initial catalog=MyDatabase;persist security info=True;user id=User;password=*****;MultipleActiveResultSets=True;App=EntityFramework&';";
更新:
public ProcurementContext()
{
var s =
@"metadata=res://*/ProcurementModel.csdl|res://*/ProcurementModel.ssdl|
res://*/ProcurementModel.msl;provider=System.Data.SqlClient;
provider connection string=&';data source=JAMES-DESKTOP\SQLEXPRESS;initial catalog=MyDatabase;persist security info=True;user id=jd;password=P@ssw0rd;MultipleActiveResultSets=True;App=EntityFramework&';";
_connectionString = s;
}
獲取數據:
public List<Procurement> ParcelListByUser(string userName)
{
using (var context = new ProcurementEntities(_connectionString))
{
return context.Procurements.Where(p => p.UserName == userName).ToList();
}
}
構造函數:
public ProcurementEntities(string connectionString)
: base(connectionString)
{
}
錯誤信息:
初始化字符串的格式不符合從索引165開始的規范。
組態:
采購的配置
public class ProcurementConfiguration:DbConfiguration
{
public ProcurementConfiguration()
{
SetExecutionStrategy("System.Data.SqlClient", () => new SqlAzureExecutionStrategy());
SetDefaultConnectionFactory(new SqlConnectionFactory(ConnectionStrings.LocalConnectionString));
}
}
我認為問題出在您的連接字符串中。 我做了同樣的事情,並且有一個函數可以自動創建連接字符串。
編碼:
public static string GetConnectionString()
{
// Build the provider connection string with configurable settings
string cn = "server=" + mdlImpostazioni.p.dbServer;
cn += ";database=" + mdlImpostazioni.p.dbName;
cn += ";uid=" + mdlImpostazioni.p.dbUser;
cn += ";pwd=" + mdlImpostazioni.p.dbPassword + ";";
var providerSB = new SqlConnectionStringBuilder(cn);
var efConnection = new EntityConnectionStringBuilder();
// or the config file based connection without provider connection string
efConnection.Provider = "System.Data.SqlClient";
efConnection.ProviderConnectionString = providerSB.ConnectionString;
// based on whether you choose to supply the app.config connection string to the constructor
efConnection.Metadata = @"res://*"; //-----> very important
return efConnection.ToString();
}
這樣,就像您的代碼一樣,我將返回值傳遞給我的db上下文構造函數。 我的構造函數是:
public partial class Entities : DbContext
{
public Entities(string nameOrConnectionString)
: base(nameOrConnectionString)
{
}
public void Close()
{
this.Dispose();
}
}
嘗試一下,問是否有問題。
動態更改您的連接字符串的一種方法是僅更改實體框架基礎連接的連接字符串。 像這樣:
myDbContext.Database.Connection.ConnectionString = "Data source=JAMES-DESKTOP\SQLEXPRESS;initial catalog=MyDatabase;persist security info=True;user id=DynamicUser;password=DynamicPassword;MultipleActiveResultSets=True;App=EntityFrameworkForUser";
這樣,您的應用程序不必對與實體框架(即元數據)相關的令牌進行硬編碼。
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