本文整理汇总了C#中System.Data.DataTable.ChildRelations属性的典型用法代码示例。如果您正苦于以下问题：C# DataTable.ChildRelations属性的具体用法？C# DataTable.ChildRelations怎么用？C# DataTable.ChildRelations使用的例子？那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类System.Data.DataTable的用法示例。
在下文中一共展示了DataTable.ChildRelations属性的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: GetChildRowsFromDataRelation
private static void GetChildRowsFromDataRelation()
{
/* For each row in the table, get the child rows using the
ChildRelations. For each item in the array, print the value
of each column. */
DataTable table = CreateDataSet().Tables["Customers"];
DataRow[] childRows;
foreach(DataRelation relation in table.ChildRelations)
{
foreach(DataRow row in table.Rows)
{
PrintRowValues(new DataRow[] {row}, "Parent Row");
childRows = row.GetChildRows(relation);
// Print values of rows.
PrintRowValues(childRows, "child rows");
}
}
}
public static DataSet CreateDataSet()
{
// create a DataSet with one table, two columns
DataSet dataSet = new DataSet();
// create Customer table
DataTable table = new DataTable("Customers");
dataSet.Tables.Add(table);
table.Columns.Add("customerId", typeof(int)).AutoIncrement = true;
table.Columns.Add("name", typeof(string));
table.PrimaryKey = new DataColumn[] { table.Columns["customerId"] };
// create Orders table
table = new DataTable("Orders");
dataSet.Tables.Add(table);
table.Columns.Add("orderId", typeof(int)).AutoIncrement = true;
table.Columns.Add("customerId", typeof(int));
table.Columns.Add("amount", typeof(double));
table.PrimaryKey = new DataColumn[] { table.Columns["orderId"] };
// create relation
dataSet.Relations.Add(dataSet.Tables["Customers"].Columns["customerId"],
dataSet.Tables["Orders"].Columns["customerId"]);
// populate the tables
int orderId = 1;
for(int customerId=1; customerId<=10; customerId++)
{
// add customer record
dataSet.Tables["Customers"].Rows.Add(
new object[] { customerId,
string.Format("customer{0}", customerId) });
// add 5 order records for each customer
for(int i=1; i<=5; i++)
{
dataSet.Tables["Orders"].Rows.Add(
new object[] { orderId++, customerId, orderId * 10 });
}
}
return dataSet;
}
private static void PrintRowValues(DataRow[] rows, string label)
{
Console.WriteLine("\n{0}", label);
if(rows.Length <= 0)
{
Console.WriteLine("no rows found");
return;
}
foreach(DataRow row in rows)
{
foreach(DataColumn column in row.Table.Columns)
{
Console.Write("\table {0}", row[column]);
}
Console.WriteLine();
}
}