C# 在代码中创建 DataTable 和从数据库取出的数据 DataTable

private void MakeDataTableAndDisplay(){
   // Create new DataTable.
   DataTable myDataTable = new DataTable("MyDataTable");
  
   // Declare DataColumn and DataRow variables.
   DataColumn myDataColumn;
   DataRow myDataRow;

   // Create new DataColumn, set DataType, ColumnName and add to DataTable.   
   myDataColumn = new DataColumn();
   myDataColumn.DataType = System.Type.GetType("System.Int32");
   myDataColumn.ColumnName = "id";
   myDataTable.Columns.Add(myDataColumn);

   // Create second column.
   myDataColumn = new DataColumn();
   myDataColumn.DataType = Type.GetType("System.String");
   myDataColumn.ColumnName = "item";
   myDataTable.Columns.Add(myDataColumn);

   // Create new DataRow objects and add to DataTable.   
   for(int i = 0; i < 10; i++){
      myDataRow = myDataTable.NewRow();
      myDataRow["id"] = i;
      myDataRow["item"] = "item " + i;
      myDataTable.Rows.Add(myDataRow);
   }
   // Set to DataGrid.DataSource property to the table.
   dataGrid1.DataSource = myDataTable;
}

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C# 在代码中创建 DataTable 和从数据库取出的数据 DataTable 合并
      myDataRow = myDataTable.NewRow();
      myDataRow["id"] = i;
      myDataRow["item"] = "item " + i;
      myDataTable.Rows.Add(myDataRow);