一.源码及说明:
二.使用方法:
1.在项目中添加引用
2.程序中添加命名空间，如：using Andy.DataSetHelper;
3.定义对象，并实例化，如：DataSetHelper dsHelper = new DataSetHelper(ref ds); ds为需要操作的DataSet对象
4.调用查询方法，如：dsHelper.SelectJoinInto("查询结果表名", ds.Tables["源表名（子表）"], "查询结果的目标字段", "查询条件", "排序字段"); 各参数的说明见前文。
5调用完成后，在ds中将有一张名称为“查询结果表名”的DataTable。
三.使用用例:
////////定义变量，并初始化
DataSet ds = new DataSet();
DataSetHelper dsHelper = new DataSetHelper(ref ds);
GridView dataGrid1 = new GridView();
//////////创建第一张表Employees
DataTable dt = new DataTable("Employees");
dt.Columns.Add("EmployeeID",Type.GetType("System.Int32") );
dt.Columns.Add("FirstName", Type.GetType("System.String"));
dt.Columns.Add("LastName", Type.GetType("System.String"));
dt.Columns.Add("BirthDate", Type.GetType("System.DateTime"));
dt.Columns.Add("JobTitle", Type.GetType("System.String"));
dt.Columns.Add("DepartmentID", Type.GetType("System.Int32"));
dt.Rows.Add(new object[] {1, "Tommy", "Hill", new DateTime(1970, 12, 31), "Manager", 42});
dt.Rows.Add(new object[] {2, "Brooke", "Sheals", new DateTime(1977, 12, 31), "Manager", 23});
dt.Rows.Add(new object[] {3, "Bill", "Blast", new DateTime(1982, 5, 6), "Sales Clerk", 42});
ds.Tables.Add(dt); ///////添加到ds中
//////////创建第二张表Departments
dt = new DataTable("Departments");
dt.Columns.Add("DepartmentID", Type.GetType("System.Int32"));
dt.Columns.Add("DepartmentName", Type.GetType("System.String"));
dt.Rows.Add(new object[] {15, "Men's Clothing"});
dt.Rows.Add(new object[] {23, "Women's Clothing"});
dt.Rows.Add(new object[] {42, "Children's Clothing"});
ds.Tables.Add(dt); ///////添加到ds中
//////////添加关系
ds.Relations.Add("DepartmentEmployee", ds.Tables["Departments"].Columns["DepartmentID"], ds.Tables["Employees"].Columns["DepartmentID"]);
///////////////////条用方法
dsHelper.SelectJoinInto("EmpDept2", ds.Tables["Employees"], "FirstName,LastName,BirthDate BDate,DepartmentEmployee.DepartmentName Department", "JobTitle='Manager'", "DepartmentID");
////////////////////绑定结果
dataGrid1.SetDataBinding(ds, "EmpDept2");