winform 上传图片（留作学习资料）

最新推荐文章于 2025-06-30 11:28:09 发布

原创最新推荐文章于 2025-06-30 11:28:09 发布 · 472 阅读

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文章标签：

#winform #exception #string #insert #sql #image

本文介绍了一个使用C#实现的图片上传功能，并将其保存为二进制格式到数据库中，同时展示了如何从数据库读取这些图片并显示在应用程序界面上。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
using System.IO;
namespace ReadImage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog Dialog = new OpenFileDialog();
            Dialog.Filter = "图像文件(*.BMP;*.JPG;*.GIF;*.PNG)|*.BMP;*.JPG;*.GIF;*.PNG";
            if (Dialog.ShowDialog() == DialogResult.OK)
            {
                string FileName = Dialog.FileName;
                FileStream fs = new FileStream(FileName, FileMode.Open);
                byte[] b=new byte[fs.Length];
                BinaryReader br = new BinaryReader(fs);
                b = br.ReadBytes(Convert.ToInt32(fs.Length));
                string sql = "INSERT INTO [Mag_Rol].[dbo].[ImageTable] VALUES(4,@photo)";
                SqlParameter[] param = new SqlParameter[]
                {
                    new SqlParameter("@photo",b)
                };
                Insert(sql, param);
                string select = "select * from [ImageTable] where imageID=@imageID";
                SqlParameter[] parameter = new SqlParameter[]
                {
                    new SqlParameter("@imageID",4)
                };
                SqlDataReader dr = GetData(select, parameter);
                dr.Read();
                if (dr[1] != DBNull.Value)
                {
                    MemoryStream ms = new MemoryStream((byte[])dr[1]);
                    Image image = Image.FromStream(ms);
                    this.pictureBox1.Image = image;
                }
                else
                {
                    this.pictureBox1.Image = null;
                    MessageBox.Show("Not Sucessed");
                }
                conn.Close();
                dr.Dispose();
            }
        }

     private static string connectionstring = "server=.;database=Mag_Rol;Integrated Security=sspi";
        SqlConnection conn = new SqlConnection(connectionstring);
        SqlCommand comm;

        public void Insert(string sql,SqlParameter[] param)
        {
            try
            {

                conn.Open();
                comm = new SqlCommand(sql, conn);
                foreach (SqlParameter pa in param)
                {
                    if (pa != null)
                    {
                        comm.Parameters.Add(pa);
                    }
                }
                comm.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                conn.Close();
                comm.Dispose();
            }
        }

        public SqlDataReader GetData(string sql,SqlParameter[] param)
        {
            try
            {
                conn.Open();
                comm = new SqlCommand(sql, conn);
                foreach (SqlParameter pa in param)
                {
                    if (pa != null)
                    {
                        comm.Parameters.Add(pa);
                    }
                }
                SqlDataReader read = comm.ExecuteReader();
                return read;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }

        }
    }
}