如何在各類控制元件中輸入/輸出資料（學習筆記）
一、知識點描述
1、相關控制元件
①下拉框（ComboBox）
顯示一個可編輯的文字框，其中包含一個允許值下拉列表。
②日曆框（DateTimePick）
允許使用者選擇日期和時間，並以指定的格式顯示該日期和時間。
③文字框（TextBox）
允許使用者輸入文字，並提供多行編輯和密碼字元掩碼功能。
④圖片框（PictureBox）
指定支援事務處理初始化，允許使用者載入圖片。
⑤單選框（RadioButton）
當與其他單選按鈕成對出現時，允許使用者從一組選項中選擇單個選項。
二、思維導圖
三、示例程式碼
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;
using System.Drawing.Imaging;
namespace 護士工作站
{
public partial class 資訊管理 : Form
{
private string PhotoFileName;
public 資訊管理()
{
InitializeComponent();
this.工號.Text = 登入.txt;
}
//button1_Click事件下的程式碼為載入程式碼
private void button1_Click(object sender, EventArgs e)
{
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString =
"Server=(local);Database=EduBase1;Integrated Security=sspi";
SqlCommand sqlCommand = new SqlCommand();
SqlCommand sqlCommand2 = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand2.Connection = sqlConnection;
sqlCommand.CommandText = "SELECT * FROM tb_Room;";
sqlCommand2.CommandText = "SELECT * FROM tb_Nurse WHERE [email protected];";
sqlCommand2.Parameters.AddWithValue("@No", this.工號.Text.Trim());
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
sqlDataAdapter.SelectCommand = sqlCommand;
DataTable roomTable = new DataTable();
sqlConnection.Open();
sqlDataAdapter.Fill(roomTable);
this.所屬科室.DataSource = roomTable;
this.所屬科室.DisplayMember = "Name";
this.所屬科室.ValueMember = "No";
SqlDataReader sqlDataReader = sqlCommand2.ExecuteReader();
byte[] photoBytes = null;
if (sqlDataReader.Read())
{
this.工號.Text = sqlDataReader["No"].ToString();
this.姓名.Text = sqlDataReader["Name"].ToString();
this.rdb_Male.Checked = (bool)sqlDataReader["Gender"];
this.rdb_Female.Checked = !(bool)sqlDataReader["Gender"];
this.職稱.Text = sqlDataReader["Title"].ToString();
this.所屬科室.SelectedValue =(int) sqlDataReader["RoomNo"];
photoBytes =
(sqlDataReader["Photo"] == DBNull.Value ? null : (byte[])sqlDataReader["Photo"]);
}
sqlDataReader.Close();
if (photoBytes != null)
{
MemoryStream memoryStream = new MemoryStream(photoBytes);
this.照片.Image = Image.FromStream(memoryStream);
}
}
//button3_Click事件下的程式碼為開啟照片程式碼
private void button3_Click(object sender, EventArgs e)
{
OpenFileDialog openPhotoDialog = new OpenFileDialog()
{
Title = "開啟照片檔案（點陣圖格式）"
,
Filter = "BMP Files (*.bmp)|*.bmp"
,
InitialDirectory = @"C:\"
};
if (openPhotoDialog.ShowDialog() == DialogResult.OK)
{
this.PhotoFileName = openPhotoDialog.FileName;
this.照片.Image = Image.FromFile(this.PhotoFileName);
}
}
//button2_Click事件下的程式碼為載入程式碼
private void button2_Click(object sender, EventArgs e)
{
MemoryStream memoryStream = new MemoryStream();
this.照片.Image.Save(memoryStream, ImageFormat.Bmp);
byte[] photoBytes = new byte[memoryStream.Length];
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.Read(photoBytes, 0, photoBytes.Length);
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString =
"Server=(local);Database=EduBase1;Integrated Security=sspi";
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandText =
"UPDATE tb_Nurse"
+ " SET [email protected],[email protected],[email protected],[email protected],[email protected]"
+ " WHERE [email protected];";
sqlCommand.Parameters.AddWithValue("@Name", this.姓名.Text.Trim());
sqlCommand.Parameters.AddWithValue("@Gender", this.rdb_Male.Checked);
sqlCommand.Parameters.AddWithValue("@Title", this.職稱.Text.Trim());
sqlCommand.Parameters.AddWithValue("@RoomNo", (int)this.所屬科室.SelectedValue);
sqlCommand.Parameters.AddWithValue("@Photo", photoBytes);
sqlCommand.Parameters.AddWithValue("@No", this.工號.Text.Trim());
sqlConnection.Open();
int rowAffected = sqlCommand.ExecuteNonQuery();
sqlConnection.Close();
MessageBox.Show("更新" + rowAffected.ToString() + "行。");
}
}
}
四、效果截圖
1、首先進入資訊管理頁面
2、載入該護士的個人資訊
3、在開啟照片中選擇自己需要載入的圖片
4、若要更新個人資訊可直接在頁面上更改內容
5、點選更新可提示更新的行數
6、這時再點選載入就是你更新的內容
