Many of the table options, including the primary column, are fixed and can't be changed. Activity tables appear in the timeline on model-driven app forms. Virtual: Virtual tables connect to data from an external data source such as Microsoft Azure SQL Database. Virtual tables appear in your...
在解决方案资源管理器中,右键单击“WinFormswithEFSample”项目 选择“管理 NuGet 包…” 在“管理 NuGet 包”对话框中,选择“联机”选项卡,然后选择 EntityFramework 包 单击“安装” 备注 除了EntityFramework 程序集,还添加了对 System.ComponentModel.DataAnnotations 的引用。 如果项目引用了 System.Data.Entity...
此分步演练演示如何将 POCO 类型绑定到“主-详细信息”窗体中的 Windows 窗体 (WinForms) 控件。 应用程序使用实体框架,用数据库中的数据填充对象、跟踪更改并将数据保存到数据库。该模型定义了两种参与一对多关系的类型:Category (principal\master) 和 Product (dependent\detail)。 然后,使用 Visual Studio 工具将...
Create a datasheet form In the Navigation Pane, click the table or query that contains the data that you want to see on the form. On theCreatetab, in theFormsgroup, clickMore Forms, and then clickDatasheet. Access creates the form and displays it in Datasheet view. You can ...
To create a new split form by using the Split Form tool, in the Navigation Pane, click the table or query that contains the data, and then on theCreatetab, clickMore Forms, and then clickSplit Form. Access creates the form and you can make design changes to the form. For example, yo...
逐步解說:使用兩個 Windows Forms DataGridView 控制項建立主從式表單 在Windows Forms DataGridView 控制項中顯示資料 保護連接資訊 其他資源 訓練 模組 在.NET MAUI 中建立使用資料繫結的 UI。 - Training 建立具有資料繫結的UI。 您的 UI 會根據最新的資料自動更新,而資料會更新以回應 UI 中的變更。
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SQL 语法包含许多用于创建和修改各种数据库对象的语句。 例如, CREATE TABLE 语句在执行时,会创建具有指定列和约束的新表。 ALTER TABLE 语句修改现有表,添加、删除或修改其列或约束。 还有用于创建、修改和删除索引、视图、用户定义的函数、存储过程、触发器和其他数据库对象的...
using System; using System.Data; using System.Data.SqlClient; using System.Windows.Forms; public class Form1 : System.Windows.Forms.Form { private DataGridView masterDataGridView = new DataGridView(); private BindingSource masterBindingSource = new BindingSource(); private DataGridView detailsDataGrid...
Creating the forms The best way to show you how to create subforms is by demonstrating the process with an example. Before you begin, you need two tables. The tables must include a common field that you can use to link them. The table's fields must be the same field type and length...