Implementation method of comboBox control data binding in WinForm

This article describes the implementation method of comboBox control data binding in WinForm. Share it for your reference, as follows:

The following introduces three ways to bind comboBox, namely IList and Dictionary in generics, and dataset DataTable

1. IList

Now we create a List collection directly and bind

IList<string> list = new List<string>();
("111111");
("222222");
("333333");
("444444");
 = list;

After execution, we will find that the binding is successful, but we know that generally there will be a value and a displayed content for the binding of the drop-down box. At this time, we can create a class, encapsulate both value and text into this class, as the type of list

public class Info
{
  public string Id { get; set; }
  public string Name { get; set; }
}
private void bindCbox()
{
  IList<Info> infoList = new List<Info>();
  Info info1 = new Info() { Id="1",Name="Zhang San"};
  Info info2 = new Info() { Id="2",Name="Li Si"};
  Info info3 = new Info() { Id = "3",Name = "Wang Wu" };
  (info1);
  (info2);
  (info3);
   = infoList;
   = "Id";
   = "Name";
}

At this time, we can directly obtain the value and displayed content

2. Dictionary

This is a bit special and cannot be bound directly. You need to use the class BindingSource to complete the binding

Dictionary<int, string> kvDictonary = new Dictionary<int, string>();
(1, "11111");
(2, "22222");
(3, "333333");
BindingSource bs = new BindingSource();
 = kvDictonary;
 = bs;
 = "Key";
 = "Value";

3. Dataset

This is quite common, very simple

//Dataset bindingprivate void BindCombox()
{
  DataTable dt = new DataTable();
  DataColumn dc1 = new DataColumn("id");
  DataColumn dc2 = new DataColumn("name");
  (dc1);
  (dc2);
  DataRow dr1 = ();
  dr1["id"] = "1";
  dr1["name"] = "aaaaaa";
  DataRow dr2 = ();
  dr2["id"] = "2";
  dr2["name"] = "bbbbbb";
  (dr1);
  (dr2);
   = dt;
   = "id";
   = "name";
}

Notice:

When we trigger the SelectedIndexChanged event of combox, we will execute it when loading the form. I was also fascinated at the beginning, which leads to errors. We can take some methods to avoid execution of this, such as defining a variable fig=false

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
  if()
  {
    string selectValue = ();
     = selectValue;
  }
}

Then we must have to execute the form after loading it, so after loading the form we must set the value of fig to true

private void SetAutoMessage_Load(object sender, EventArgs e)
{
  loadCombox();
  loadMessageTemplet();
  fig= true;
}

For more information about C# related content, please check out the topic of this site:Summary of WinForm control usage》、《Summary of C# form operation skills》、《C# data structure and algorithm tutorial》、《Tutorial on the usage of common C# controls》、《Introduction to C# object-oriented programming tutorial"and"Summary of thread usage techniques for C# programming》

I hope this article will be helpful to everyone's C# programming.