Question

在运行时，我正在查询访问表并将结果存储在数组中。例如，该访问表的数据结构是

SalespersonName ------ Item1Sold ----- Item2Sold ---------- Item3Sold
Mitch                  Boat            Camera
Jason                  Car             Shells
Mitch                  Eggs
Richard                Coffee          Bacon                 Beans

我想创建一个包含SalespersonName＆amp;的标签。在SalesPerson名称旁边创建一个文本框，该文本框将显示所有非空白的itemold字段。所以我想要的输出是

(label) Mitch (textbox) Boat (textbox) Camera
(label) Jason (textbox) car (textbox) shells
(label) Mitch (textbox) Eggs
(label) Richard (textbox) Coffee (textbox) bacon (tetbox) beans

如果值不为null，我无法弄清楚如何只生成文本框。我只能做所有或不做的事，而不是我所追求的。

添加以下所有内容的代码

string path = "A:\\Database1.mdb";
object oName = path;
System.Collections.Hashtable lookup = new System.Collections.Hashtable();
OleDbConnection olecon = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +  oName);
olecon.Open();
OleDbCommand command = new OleDbCommand("SELECT * FROM info", olecon);
dr = command.ExecuteReader();
while (dr.Read())
{
   fields.Add(dr[0].ToString());
}
dr.Close();
foreach (string field in fields)
{
   Label labelz = new Label();
   labelz.Name = "labelz_" + index;
   labelz.Text = label;
   labelz.AutoSize = true;
   labelz.Location = new Point(10, 30);
   panel1.Controls.Add(labelz);

   TextBox textboxes = new TextBox();
   textboxes.Name = "txt_" + index;
   textboxes.Location = new Point(10, 80);
   textboxes.AutoSize = true;
   panel1.Controls.Add(textboxes);
   if (field != "")
   {
     panel1.SetFlowBreak(textboxes, true);
   }

   index++;
}

Answer 1

您的代码没有添加所有组件。它在标签变量和文本框中添加带有文本的标签。我建议你将逻辑拆分为两部分：

检索数据并使其更舒适地操作结构 - 创建一个包含数据库所需数据的类。
使用数据创建所需布局的组件。

如何做到（未经过测试的伪代码）：

第一部分：

//data class
class Person
{
  public string Name {get;set;}
  public List<string> SoldItems {get;set;}
}

//fill data
List<Person> Persons = new List<Person>();
int itemColumnCount = 3;
while (dr.Read())
{
  Person person = new Person();
  person.SoldItems = new List<string>();
  //Get person name
  person.Name = dr.GetString(dr.GetOrdinal("personNameColumn"));
  //Get sold items
  for(int i = 1; i <= itemColumnCount; i++)
  {
    //lets say you have columns: ItemSoldColumn1, ItemSoldColumn2, ItemSoldColumn3 for example
    string columnName = "ItemSoldColumn" + i;
    //check if column value is not null
    if(!dr.IsDBNull(dr.GetOrdinal(columnName)))
    {
      string soldItem = dr.GetString(dr.GetOrdinal(columnName));
      //add to persons sold items list
      person.SoldItems.Add(soldItem);
    }
  }
}

第二部分：

foreach(var person in Persons)
{
   //create label and set text to persons name
   //...
   newLabel.Text = person.Name;
   //add to panel or some kind of layout control

   //here you will have only sold items which is not null in database
   //so just loop through sold items list and create texboxes   
   foreach(var item in person.SoldItems)
   {
     //create textbox
     newTextBox.Text = item;
     //add to panel or some kind of layout control
   }
}

P.S。考虑将数据库结构更改为人员 - ＆lt; SoldItems关系。

将TextBox与标签匹配

1 个答案: