asp.net – Linq to Sql – 根据环境变量动态设置连接字符串

MyDataClassesDataContext db = new MyDataClassesDataContext(dynamicConnString);

对于LinqDataSource,截取ContextCreating事件并如上所述手动创建DataContext：

protected void LinqDataSource_ContextCreating(object sender,LinqDataSourceContextEventArgs e)
{
    e.ObjectInstance = new MyDataClassesDataContext (dynamicConnString);
}

从MSDN：

By default,the LinqDataSource control creates an instance of the type that is specified in the ContextTypeName property. The LinqDataSource control calls the default constructor of the data context object to create an instance of the object. It is possible that you have to use a non-default constructor or you have to create an object that differs from the one specified in the ContextTypeName property. In that case,you must handle the ContextCreating event and manually create the data context object.