如何在 Windows Form Application with Dapper 中直接从 PictureBox 保存图像而不使用 Dapper 的存储过程？

Question

之前用存储过程把pic保存到db，现在想不用存储过程保存可以直接从 PictureBox?

保存吗

private void buttonsave_Click(object sender, EventArgs e)
{
    Categoryentity categoryentity = new Categoryentity();
    categoryentity.CategoryName = texboxcatname.Text;
    categoryentity.Description = textBoxcatdesc.Text;
    categoryentity.Picture = pictureBox1.Image;
    Dbclass dbclass = new Dbclass();

    long result = dbclass.insertcategory(categoryentity);
    if (result > 0)
    {
        MessageBox.Show("inserted");
    }
    else
    {
        MessageBox.Show("failed");
    }
}

private void buttonuploadpic_Click(object sender, EventArgs e)
{
    //string imagelocation = "";
    //try
    //{
    OpenFileDialog fdialog = new OpenFileDialog();
    fdialog.Filter = "jpg files(*.jpg)|*.jpg| PNG files(*.png)|*.png| All Files(*.*)|*.*";

    if (fdialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
    {
        imagelocation = fdialog.FileName.ToString();
        pictureBox1.ImageLocation = imagelocation;
    }
}

实体class

using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Dapper.Contrib.Extensions;

namespace Northwind.Entities
{
    [Table ("Categories")]
  public   class Categoryentity
    {

        public int CategoryID { get; set; }

        public string CategoryName { get; set; }

        public string Description { get; set; }

        public string Pic { get; set; }

        public Image Picture { get; set; }

插入fn

 public class Dbclass
    {
       
        public long insertcategory(Categoryentity categoryentity)
        {
            using (var connection = DBLayer.ConnectionFactory())
            {
                long id = connection.Insert<Categoryentity>(categoryentity);
                return id;

            }
        }

我可以上传图片，但我不知道如何正确插入。但是我在使用存储过程的时候，插入成功了

上一个存储过程

byte[] images = null;
FileStream fileStream = new FileStream(imagelocation, FileMode.Open, FileAccess.Read);
BinaryReader binaryReader = new BinaryReader(fileStream);
images = binaryReader.ReadBytes((int)fileStream.Length);

Dbclass dbclass = new Dbclass();

string maincon = ConfigurationManager.ConnectionStrings["connection"].ConnectionString;
SqlConnection sqlcon = new SqlConnection(maincon);

sqlcon.Open();
string query = "insert into Categories(CategoryName,Description,Picture) Values ('" + texboxcatname.Text + "','" + textBoxcatdesc.Text + "',@images)";

SqlCommand sqlCommand = new SqlCommand(query, sqlcon);
sqlCommand.Parameters.Add(new SqlParameter("@images", images));
int N = sqlCommand.ExecuteNonQuery();
sqlcon.Close();
MessageBox.Show("saved");

Answer 1

您可以使用 https://www.nuget.org/packages/Dapper.Contrib/.

然后使用下面的代码插入记录

Categoryentity obj = new Categoryentity ();
...
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
    conn.Open();
    return conn.Insert(obj) ;
}

Answer 2

直接将picturebox图片插入数据table，从数据table中读取图片到picturebox，可以参考下面的代码试试

using Dapper.Contrib.Extensions;
using System;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
namespace insertimage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Add();
            MessageBox.Show("saved");
        }
        internal void Add()
        {
            string constr = @"constr";
            SqlConnection con = new SqlConnection(constr);
            string sqlinsert = "insert into  [dbo].[Category] ([Id],[Name],[Picture]) values (@Id,@Name,@Picture) ";
            con.Open();
            SqlCommand cmd = new SqlCommand(sqlinsert, con);
            byte[] b;
            Image img = pictureBox1.Image;
            using (MemoryStream mStream = new MemoryStream())
            {
                img.Save(mStream, img.RawFormat);
                b = mStream.ToArray();
            }
            cmd.Parameters.AddWithValue("@Id", texboxcatid.Text);
            cmd.Parameters.AddWithValue("@Name", textBoxcatdesc.Text);
            cmd.Parameters.AddWithValue("@Picture", b);
            cmd.ExecuteNonQuery();
            con.Close();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            string constr = @"constr";
            SqlConnection con = new SqlConnection(constr);
            string sql = "select * from  [dbo].[Category]";
            con.Open();
            SqlCommand cmd = new SqlCommand(sql, con);
            SqlDataReader reader = cmd.ExecuteReader();
            byte[] by = null;
            while (reader.Read())
            {
                by = (byte[])reader[2];
            }
            Image img = byteArrayToImage(by);
            pictureBox2.Image = img;
        }
        public Image byteArrayToImage(byte[] bytesArr)
        {
            using (MemoryStream memstr = new MemoryStream(bytesArr))
            {
                Image img = Image.FromStream(memstr);
                return img;
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            OpenFileDialog fdialog = new OpenFileDialog();
            fdialog.Filter = "jpg files(*.jpg)|*.jpg| PNG files(*.png)|*.png| All Files(*.*)|*.*";

            if (fdialog.ShowDialog() == DialogResult.OK)
            {
                FileStream fs = new FileStream(fdialog.FileName, FileMode.Open, FileAccess.Read);
                Image im = Image.FromStream(fs);
                pictureBox1.Image = im;
            }
        }
    }
    [Table("Category")]
    public class Category
    {
        [Key]
        public int Id { get; set; }

        public string Name { get; set; }

        public Image Picture { get; set; }
    }
}

结果：

Answer 3

我们可以使用这段代码从图片框中插入图片

在此之前将实体 class 上的图像类型声明为 byte[]。

按钮保存操作

 private void buttonSavemp_Click(object sender, EventArgs e)
        {
 empentity.PhotoPath = textBoxphotopath.Text;

            Image image = pictureBoxphoto.Image;
            byte[] data;
            using (MemoryStream ms = new MemoryStream())
            {
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                data = ms.ToArray();
            }

            empentity.Photo = data;
     Dbclass dbclass = new Dbclass();
            long result = dbclass.insertpicture(empentity);

            if (result > 0)
            {
                MessageBox.Show("inserted succesfully");
            }
            else
            {
                MessageBox.Show("insertion failed");
            }

我们可以使用下面的代码获取图片

 System.Drawing.ImageConverter imageConverter = new System.Drawing.ImageConverter();
                Image image = (Image)imageConverter.ConvertFrom(employeentity.Photo);
                pictureBoxphoto.Image = image;

如何在 Windows Form Application with Dapper 中直接从 PictureBox 保存图像而不使用 Dapper 的存储过程？

How to save the image directly from PictureBox without stored procedure with Dapper in Windows Form Application with Dapper?

c#

image

visual-studio

dapper

windows-forms-designer