C ＃ use database to bind listview control data

Preface

Previous article bloggers wrote an article about ListView Simple handling of controls , Data processing has great limitations , For this control, we mostly connect to the database for use , Most of our data are dynamic , So if we simply add data, there are limitations , So today's article bloggers use databases to ListView This control is data bound , It's an extension of our last article ！！！ Hey , No, children's shoes can comment or ask bloggers in private letters

Once a day , Prevent decadence

（ We should stick to it for ourselves , No matter how difficult it is ）

1. Open the project of our last article , Delete static data . We use database processing. Students who can't need to read an article

2. Use database pair ListView Data display operation

2.1  Double click the form interface to automatically generate functions

2.2.  Create the database we need and write the value

Bloggers use SQL server  Students without this database can use MySQL Previous articles of bloggers have written

2.3.  Use code to ListView Control establishes a connection with the database and binds data

2.4.  Use database pair LIstVIew Control to display the effect of data binding query

3. Use the dialog box to create a search query on the database

4. Add a form to realize the operation of creating a new file

4.1  Use conTextMenuStrip Control, right-click to create a new

4.2  Realize the jump between forms

Create a new form file , And drag the style , Instantiate a form in the function that needs to jump 2, Use Show Exhibition .

4.3  Yes ” New file “ Form code processing

5. Overall code presentation , design sketch

5.1 forms 1 Core code ：

 private void Form1_Load(object sender, EventArgs e)
 {
 string connString = "server=.;database=mychat; User ID = sa; Pwd=123456";// Write the database opening statement , Bloggers use SQL server database , If you are MySQL  You can see the previous article of the blogger, which explains .
 SqlConnection conn = new SqlConnection(connString);// Materialize
 conn.Open();// Open database
 string sql = "select name,type,size,date,Imageid from listview";// Query statement
 SqlCommand cmd = new SqlCommand(sql, conn);// Establishing a connection
 SqlDataReader reader = cmd.ExecuteReader();
 listView1.Items.Clear();// Empty listView
 while (reader.Read())// Query result traversal , And data binding
 {
 ListViewItem item = new ListViewItem(reader[0].ToString().Trim());//Trim() Clear the space
 item.ImageIndex = Convert.ToInt32(reader[4]);// Binding Icon id
 item.SubItems.Add(reader[1].ToString().Trim());// Data binding
 item.SubItems.Add(reader[2].ToString().Trim());
 item.SubItems.Add(reader[3].ToString().Trim());
 this.listView1.Items.Add(item);
 }
 reader.Close();
 conn.Close();
 }
 private void button4_Click(object sender, EventArgs e)
 {
 string connString = "server=.;database=mychat; User ID = sa; Pwd=123456";
 SqlConnection conn = new SqlConnection(connString);
 conn.Open();
 string sql =string.Format("select name,type,size,date,Imageid from listview where name like '%{0}%';", textBox1.Text);// Implement fuzzy query
 SqlCommand cmd = new SqlCommand(sql, conn);
 SqlDataReader reader = cmd.ExecuteReader();
 listView1.Items.Clear();
 while (reader.Read())// The added data is consistent with the above code
 {
 ListViewItem item = new ListViewItem(reader[0].ToString().Trim());
 item.ImageIndex =Convert.ToInt32(reader[4]);
 item.SubItems.Add(reader[1].ToString().Trim());
 item.SubItems.Add(reader[2].ToString().Trim());
 item.SubItems.Add(reader[3].ToString().Trim());
 this.listView1.Items.Add(item);
 }
 reader.Close();
 conn.Close();
 }

 private void  New file ToolStripMenuItem_Click(object sender, EventArgs e)
 {
 Form2 form2 = new Form2();
 form2.Show();
 }

 private void listView1_SelectedIndexChanged(object sender, EventArgs e)
 {

 }


5.2  Form 2 core code ：

 private void button2_Click(object sender, EventArgs e)// Reset button
 {
 textBox1.Clear();// Yes textbox Empty
 textBox2.Clear();
 textBox3.Clear();
 textBox4.Clear();
 textBox5.Clear();
 }
 private void button1_Click(object sender, EventArgs e)// Add a button
 {
 string connString = "server=.;database=mychat; User ID = sa; Pwd=123456";
 SqlConnection conn = new SqlConnection(connString);
 conn.Open();
 string sql = string.Format("INSERT INTO listview(name, type, size, date, Imageid) VALUES('{0}','{1}','{2}','{3}',{4});",textBox1.Text, textBox2.Text, textBox3.Text+"MB", textBox4.Text,Convert.ToInt32(textBox5.Text));// Add data statement
 SqlCommand cmd = new SqlCommand(sql, conn);
 int x =cmd.ExecuteNonQuery();// Add operation , Successfully returned the number of data you added , Otherwise 0
 if (x > 0)
 {
 MessageBox.Show(" Add success ");
 this.Close();// Add success , Close this form
 }
 else
 MessageBox.Show(" Add failure ");
 }
 }


summary

The blogger roughly explained the operation of this control , Deleting is like adding , We can add a delete button later , adopt name To delete , Just add a function , Bloggers think it's very simple, so they don't do more processing , For a beginner , This article can still be understood. Connecting to the database may be unfriendly for beginners , But as long as you study hard , Follow the blogger's logic , It's understandable , Based on this blog post . Okay , It's not easy to create , Like and follow the comment collection ！！！！