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DataSet / BindingSource / DataGridView / BindingNavigator 的关系与绑定、修改数据库
一、说明 1.数据源DataSet是保存数据，以及发布数据更新通知的核心。2.BindingSource，是控件（DataGridView / BindingNavigator）与数据源交互的桥梁。BindingSource的DataSource指向数据源DataSet之后，数据源或控件的数据更改，则会被BindingSource传递到另一头。3.DataGridView / Binding用BindingSource将Windows窗体控件绑定到DBNull数据库值
https://docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/how-to-bind-windows-forms-controls-to-dbnull-database-values?view=netframeworkdesktop-4.8 当您将Windows Forms控件绑定到数据源并且数据源返回DBNull值时，您可以替换适当的值而无需处理，格式化或解析事件如何：使用 Windows 窗体 BindingSource 组件对 ADO.NET 数据进行排序和筛选
You can expose the sorting and filtering capability of BindingSource control through the Sort and Filter properties. You can apply simple sorting when the underlying data source is an IBindingList, and you can apply filtering and advanced sorting when