C#中DataSet 可视化设计使用方法
对数据库对象的操作可以编码实现，当然.NET提供了更加方便的可视化机制可以帮助我们省却很多麻烦。
首先，在项目中增加新项，选择Dataset数据集，如图所示：
比如新建一个CustomersXSD.xsd的数据集，下面将NorthWind数据库中的Customers表拖到当前设计面板,如下如所示：
如图所示，自动生成名为CustomersTableAdapter的Adapter对象，手动设置增加图上三个方法，
其中GetByPrimaryKey方法如图所示配置：
下面代码演示如何使用CustomerXSD, CustomersTableAdapter来实现对数据表Customers增加一条记录：
首先假设代码中已经生成了表Customer对象类CustomersModel，代码如下：注意加红的部分
using Model;//数据库实体类Model
using CustomersXSDTableAdapters;//引入Adapter命名空间
public class CustomersDAL
{
private CustomersTableAdapter _CustomersTableAdapter = null;
protected CustomersTableAdapter Adapter
{
get
{
if (_CustomersTableAdapter == null)
_CustomersTableAdapter = new CustomersTableAdapter();
return _CustomersTableAdapter;
}
}
//Get方法，得到表中所有的数据
public DataTable Get()
{
return Adapter.GetData();
}
// 根据主键得到数据表
public DataTable GetByPrimaryKey(String CustomerID)
{
return Adapter.GetByPrimaryKey(CustomerID);
}
//增加一条记录
public bool Add(CustomersModel model)
{
CustomersXSD.CustomersDataTable TargetTable = new CustomersXSD.CustomersDataTable();
CustomersXSD.CustomersRow TargetRow = TargetTable.NewCustomersRow();
TargetRow.CustomerID = model.CustomerID;
TargetRow.CompanyName = model.CompanyName;
TargetRow.ContactName = model.ContactName;
TargetRow.ContactTitle = model.ContactTitle;
TargetRow.Address = model.Address;
TargetRow.City = model.City;
TargetRow.Region = model.Region;
TargetRow.PostalCode = model.PostalCode;
TargetRow.Country = model.Country;
TargetRow.Phone = model.Phone;
TargetRow.Fax = model.Fax;
TargetTable.AddCustomersRow(TargetRow);
int rowaffected = Adapter.Update(TargetTable);
return rowaffected == 1;
}
//更新一条记录
public bool Update(CustomersModel model)
{
CustomersXSD.CustomersDataTable TargetTable = Adapter.GetByPrimaryKey(model.CustomerID);
if (TargetTable.Count == 0)
return false;
CustomersXSD.CustomersRow TargetRow = TargetTable[0];
TargetRow.CustomerID = model.CustomerID;
TargetRow.CompanyName = model.CompanyName;
TargetRow.ContactName = model.ContactName;
TargetRow.ContactTitle = model.ContactTitle;
TargetRow.Address = model.Address;
TargetRow.City = model.City;
TargetRow.Region = model.Region;
TargetRow.PostalCode = model.PostalCode;
TargetRow.Country = model.Country;
TargetRow.Phone = model.Phone;
TargetRow.Fax = model.Fax;
int rowsaffected = Adapter.Update(TargetRow);
return rowsaffected == 1;
}
//删除一条记录
public bool Delete(String CustomerID)
{
int rowsaffected = Adapter.DeleteByCustomerID(CustomerID);
return rowsaffected == 1;
}
}