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copied!<p>To use the "default convention based mapping" the following 2 approaches will work:</p> <p>1) The collision is caused by the connection string using a wild card:</p> <pre><code> metadata=res://*/Repositories.EntityFramework.Model.csdl|res://*/Repositories.EntityFramework.Model.ssdl|res://*/Repositories.EntityFramework.Model.msl; </code></pre> <p>Since * does not work your project you can define multiple connection strings to hard code the assembly containing the edmx.</p> <p>2) create a helper</p> <pre><code> public static EntityConnection GetEfConnectionString(this string sqlConnectionString) { var cs = string.Format(@"metadata=res://{0}/Repositories.EntityFramework.Model.csdl|res://{0}/Repositories.EntityFramework.Model.ssdl|res://{0}/Repositories.EntityFramework.Model.msl;provider=System.Data.SqlClient;provider connection string=""" + sqlConnectionString + @"""", Assembly.GetCallingAssembly().FullName ); return new EntityConnection(cs); } </code></pre> <p>Update 2017:</p> <pre><code> public static string GetEfConnectionString(this string sqlConnectionString, Type type) { string cs = string.Format( @"metadata=res://{0}/Models.Model.csdl|res://{0}/Models.Model.ssdl|res://{0}/Models.Model.msl;provider=System.Data.SqlClient;provider connection string=""" + sqlConnectionString + @"""", type.Assembly.FullName ); return cs; } // usage: don't "new" EntityConnection. See 2012 comment. string connString = ConfigurationManager.ConnectionStrings["sqlConnection"].ConnectionString.GetEfConnectionString(); using(var entities = new XyzEntities(connString)) </code></pre>

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