无法在实体框架DB中的dbcontext中首先创建动态连接

Question

我只想将SqlConnectionStringBuilder传入我的dbcontext base（）中，但代码不起作用。

public MirrorBranchesEntities(string db) 
     : base(ConnectToSqlServer(db)) 
    { 
    } 

    public static string ConnectToSqlServer(string catalog) 
    { 
     var sqlBuilder = new SqlConnectionStringBuilder(); 
     sqlBuilder.DataSource = "(local)"; 
     sqlBuilder.InitialCatalog = catalog; 
     sqlBuilder.PersistSecurityInfo = true; 
     sqlBuilder.IntegratedSecurity = false; 
     sqlBuilder.MultipleActiveResultSets = true;    
     sqlBuilder.UserID = "sa"; 
     sqlBuilder.Password = "Qwer0987"; 

     var entityConnectionStringBuilder = new EntityConnectionStringBuilder(); 
     entityConnectionStringBuilder.Provider = "System.Data.EntityClient"; 
     entityConnectionStringBuilder.ProviderConnectionString = sqlBuilder.ConnectionString; 
     entityConnectionStringBuilder.Metadata = "res://*/MirrorBranches.csdl|res://*/MirrorBranches.ssdl|res://*/MirrorBranches.msl"; 

     return sqlBuilder.ToString(); 
    } 

换句话说，我希望把这个

"name=" + connectionStringName + "connectionString=metadata=res://*/MirrorBranches.csdl|res://*/MirrorBranches.ssdl|res://*/MirrorBranches.msl;provider=System.Data.SqlClient;provider connection string="data source=(local);initial catalog=" + db + ";user id=sa;password=Qwer0987;MultipleActiveResultSets=True;App=EntityFramework" providerName=System.Data.EntityClient" 

到SQL连接字符串生成器来把我的DbContext。

Answer 1

为什么要返回

return sqlBuilder.ToString(); 

可能

return entityConnectionStringBuilder.ToString() 

而更换

entityConnectionStringBuilder.Provider = "System.Data.EntityClient"; 

通过

entityConnectionStringBuilder.Provider = "System.Data.SqlClient"; 

Answer 2

我认为这是你在找什么：

https://msdn.microsoft.com/en-us/library/bb302786%28v=vs.110%29.aspx

您的代码应返回：

entityConnectionStringBuilder.ToString（）;