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我在使用文本框和图片框更新数据库中的记录时遇到问题。当我尝试更新时，它给了我错误：无法找到路径的一部分。更新Winforms应用程序中的SQL记录（语言：C＃）
下面是编码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
using System.IO;
namespace CO6009DissertationV5
{
public partial class frmViewCatManagement : Form
{
SqlConnection con = new SqlConnection("Data Source = SQL2016; Initial Catalog = db; Persist Security Info=True;User ID = user_db; Password=#####");
SqlCommand com;
string imgLoc = "";
public frmViewCatManagement()
{
InitializeComponent();
}
private void frmViewCarManagement_Load(object sender, EventArgs e)
{
//DataGridViewImageColumn dgvCarCat = new DataGridViewImageColumn();
//dgvCarCat.HeaderText = "Image";
//dgvCarCat.ImageLayout = DataGridViewImageCellLayout.Stretch;
//dataGridView1.Col
}
//
// Buttons
//
private void btnUpdate_Click(object sender, EventArgs e)
{
try
{
string imgPath = txtPath.Text;
FileStream fs;
fs = new FileStream(imgPath, FileMode.Open, FileAccess.Read);
byte[] picbyte = new byte[fs.Length];
fs.Read(picbyte, 0, System.Convert.ToInt32(fs.Length));
fs.Close();
con.Open();
string qry = "UPDATE tbl_catManagement SET (catclass, carmake, cardescription, carimage) VALUES ('" + txtCatClass.Text + "', '" + txtCarMake.Text + "','" + txtCarDesc.Text + "', @img)";
//catclass='" + txtCatClass + "', carmake='" + txtCarMake.Text + "', cardescription='" + txtCarDesc.Text + "', carimagePath'" + txtPath.Text + "', @img)";
SqlParameter imgParameter = new SqlParameter();
imgParameter.SqlDbType = SqlDbType.Image;
imgParameter.ParameterName = "img";
imgParameter.Value = picbyte;
SqlCommand cmd = new SqlCommand(qry, con);
cmd.Parameters.Add(imgParameter);
cmd.ExecuteNonQuery();
MessageBox.Show("Data Updated");
cmd.Dispose();
con.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
if (con.State == ConnectionState.Open)
{
con.Close();
}
}
}
private void btnFindData_Click(object sender, EventArgs e)
{
//string sqlQuery = "SELECT catname,catdescription,carimage FROM tbl_manageCat WHERE catid= '" + txtCatID.Text + "'";
//cmd = new SqlCommand(sqlQuery, connection);
//SqlDataReader DataRead = cmd.ExecuteReader();
//DataRead.Read();
//if (DataRead.HasRows)
//{
// txtCarClass.Text = DataRead[0].ToString();
// txtCarName.Text = DataRead[1].ToString();
// txtCatDesc.Text = DataRead[2].ToString();
// byte[] images = ((byte[])DataRead[1]);
// if (images == null)
// {
// picBoxCar.Image = null;
// }
// else
// {
// MemoryStream mstream = new MemoryStream(images);
// picBoxCar.Image = Image.FromStream(mstream);
// }
//}
//else
//{
// MessageBox.Show("This Data is not available");
//}
//connection.Close();
//dataCarCategory.ColumnCount = 3;
//dataCarCategory.Columns[0].Name = "catid";
//dataCarCategory.Columns[1].Name = "catname";
//dataCarCategory.Columns[2].Name = "catdescription";
//DataGridViewImageColumn img = new DataGridViewImageColumn();
//Image image = Image.FromFile("Image Path");
//img.Image = image;
//dataCarCategory.Columns.Add(img);
//img.HeaderText = "carimage";
//img.Name = "img";
}
private void btnViewData_Click(object sender, EventArgs e)
{
//try
//{
//if (txtCatID.Text == "")
//{
// MessageBox.Show("Please Enter Category ID");
// return;
//}
//SqlCommand cmd = new SqlCommand("SELECT carimage FROM tbl_catManagement WHERE catid=" + txtCatID.Text, con);
////SqlCommand cmd = new SqlCommand("SELECT * FROM tbl_catManagement catid= " + txtCatID.Text + "catclass= " + txtCarClass, con);
//SqlDataAdapter da = new SqlDataAdapter(cmd);
//DataSet ds = new DataSet();
//da.Fill(ds);
//if(ds.Tables[0].Rows.Count > 0)
//{
// //MemoryStream ms = new MemoryStream((byte[])ds.Tables[0].Rows[0].["carimage"]);
// MemoryStream ms = new MemoryStream((byte[])ds.Tables[0].Rows[0]["carimage"]);
// picBoxCar2.Image = new Bitmap(ms);
// panel4.Visible = true;
// panel5.Visible = false;
//}
//else
//{
// MessageBox.Show("Image not found");
//}
//}
//catch (Exception ex)
//{
// MessageBox.Show(ex.Message);
//}
//finally
//{
// if (con.State == ConnectionState.Open)
// {
// con.Close();
// }
//}
con.Open();
string sqlQry = "SELECT catclass, carmake, cardescription, carimagePath, carimage FROM tbl_catManagement WHERE catid= '" + txtCatID.Text + "'";
com = new SqlCommand(sqlQry, con);
SqlDataReader sdr = com.ExecuteReader();
sdr.Read();
if (sdr.HasRows)
{
txtCatClass.Text = sdr[0].ToString();
txtCarMake.Text = sdr[1].ToString();
txtCarDesc.Text = sdr[2].ToString();
txtPath.Text = sdr[3].ToString();
byte[] img = (byte[])sdr[4];
panel4.Visible = true;
panel5.Visible = false;
panel6.Visible = false;
panel2.Visible = true;
if (img == null)
{
picBoxCar2.Image = null;
}
else
{
MemoryStream mstream = new MemoryStream(img);
picBoxCar2.Image = Image.FromStream(mstream);
}
}
else
{
MessageBox.Show("This data is not available");
}
con.Close();
}
private void btnViewAllData_Click(object sender, EventArgs e)
{
frmDGVCatManagement frmdvgCM = new frmDGVCatManagement();
frmdvgCM.Show();
}
private void btnFindCategory_Click(object sender, EventArgs e)
{
panel4.Visible = false;
panel5.Visible = true;
panel2.Visible = false;
panel6.Visible = false;
}
private void btnBrowse_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "png files(*.png)|*.png|jpg files(*.jpg)|*.jpg|All files(*.*)|*.*";
if (ofd.ShowDialog() == DialogResult.OK)
{
txtPath.Text = ofd.FileName;
picBoxCar2.Image = new Bitmap(ofd.FileName);
}
}
}
}
任何帮助，将不胜感激
代码中的哪一行出现错误？你可以分享它给出的样本路径值错误/ –
它不会在线上发生错误。但是，当我尝试单击更新按钮时，它会显示错误消息：无法找到路径的一部分。 – AdrianAndrews
您正在看到消息，因为您已经使用了try catch块，并且在发生异常时，它将捕获块和messagebox作为异常消息。您需要删除try catch或调试代码并查看发生异常的行并转到catch块。正如在答案中提到的Sujit看起来像您在代码中使用的文件路径无效。 –